Browse Topic: Bearings

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Simulation based optimization of the NVH characteristics in modern high speed engine during development phase2026-26-0326To be published on 01/16/2026
Engine noise mitigation is paramount in powertrain development for enhanced performance and occupant comfort. Identifying NVH problems at the prototype stage leads to costly and time-consuming redesigns and modifications, potentially delaying the product launch. NVH simulations facilitate identification of noise and vibration sources, informing design modifications prior to physical prototyping. Early detection and resolution of NVH problems through simulation can significantly shorten the overall development cycle and multiple physical prototypes and costly redesigns. During NVH simulations, predicting and optimizing valvetrain and timing drive noise necessitates transfer of bearing, valve spring, and contact forces to NVH simulation models. Traditional simulations, involved continuous force data export and NVH model evaluation for each design variant, pose efficiency challenges. In this paper, an approach for preliminary assessment of dB level reductions across design iterations is
Rai, Ankur, Deshpande, Ajay Mahadeo, YADAV, RAKESH
Efficiency Enhancement of Electric Vehicle Drivetrains through Advanced Gearbox Strategies2026-26-0053To be published on 01/16/2026
In the pursuit of sustainable mobility solutions, optimizing drivetrain efficiency has emerged as a critical factor in enhancing the overall performance, reliability, and market acceptance of electric vehicles (EVs). This study specifically focuses on achieving efficiency improvements within the gearbox system of Electric Vehicles, a major contributor to mechanical losses in the drivetrain. Key technical strategies explored include the adoption of low-viscosity lubricants, utilization of low-friction bearings, incorporation of high-efficiency oil seals, and the application of low-loss gear designs. Collectively, these enhancements aim to reduce mechanical frictional losses, leading to tangible benefits such as increased vehicle driving range, reduced energy consumption, lower carbon emissions, and decreased long-term maintenance costs. In addition to component-level improvements, the study investigates the integration of a 2-speed gearbox within electric vehicles as a system-level
Agrawal, Devesh, Bhardwaj, Abhishek, Bhandari, Kiran Kamlakar
Power loss evaluation in 4WD axle and correlation with Testing results2026-26-0107To be published on 01/16/2026
In the tractor, the efficiency depends on the transmission system, of all the losses major contribution is given by the transmission elements. To improve the efficiency, it became crucial to monitor the areas of power losses. Power loss in transmission refers the reduction in amount of power which being generated from the engine source to the final drive elements. There are various parameters and factors influence this condition, analyzing those conditions helps in identifying & improving the higher contributing components for driveline power loss. This study presents a comparative analysis of theoretical and experimental data regarding power loss in the gear train of a 70HP 4WD front axle. The investigation incorporates theoretical power loss calculations for individual components, including the bevel gear, bearings, thrust washer and seal arrangements. To evaluate and validate the power losses in the 4WD axle, a Gear Train Endurance test was conducted in a controlled laboratory
Jayapal, Jayaraj, Mahapatra, Soumya Ranjan, Sethi, Suvendu Kumar, JOSHI, SHRIKANT, BANGE, PRASHANT
Enhanced Methodologies for predicting Automotive Wheel Bearing life and damage using RLDA2026-26-0482To be published on 01/16/2026
The durability of wheel bearings is assessed in terms of raceway life and flange life. Raceway life focuses on the performance and damage tolerance of rolling elements, while flange life evaluates the structural integrity of wheel flanges under operational stresses. Traditionally, durability predictions relied on conventional design methods and analytic formulas for raceway spalling, as well as static load assumptions for flange fatigue analysis. Recently, integrating design of experiments (DOE) with traditional approaches has enhanced these methods, enabling systematic evaluation of design variables and loading conditions. This paper introduces a methodology for analysing raceway life and damage in automotive wheel bearings using RLDA (Road Load Data Acquisition) data. The process involves acquiring raw deterministic load data, filtering it to preserve high-peaked signals, and transforming the filtered data into block cycles derived from load time histories. Each block cycle contains
Narendra, Vishwanath, Mane, Yogiraj, Paua, Ketan, Singh, Ram Krishnan, Vellandi, Vikraman
Evaluation of compound planetary gear set loads by multibody dynamic approach with help of Adams/Gear AT2026-26-0463To be published on 01/16/2026
Planetary gear systems, commonly used in automotive applications for their compact size and high reduction ratios, comprise four key components: a sun gear, planet gears, an internal annulus (or ring) gear, and a carrier. However, for compound planetaries, comprising meshed planets, the high torques generated within these gear trains can create substantial gear forces, which are then transmitted to the gear bearings. This can lead to premature failure of either the bearings or the gear teeth themselves. Therefore, accurately evaluating these loads under various operating conditions are essential for ensuring the gear train's reliability and preventing such failures. Accurate force analysis is crucial for optimizing overall gear system performance. This includes analyzing gear tooth forces, system torques and bearing loads. However, incorporating both micro and macro gear parameters into analytical calculations is extremely complex. Multibody dynamics simulation offers a powerful and
Deshmukh, Shardul, Kakade, Shriram
AIR120425-1AIR120425-1 (Current)12/04/2025
AIR120425-1
A-10 Aircraft Oxygen Equipment Committee
Counterfeit Materiel; Assuring Acquisition of Authentic and Conforming Materiel - BearingsAS6834 (Current)11/26/2025
This document standardizes requirements for bearings: (a) supply chain management, procurement, inspection, parts management, and test/evaluation to assure the authenticity of bearings being acquired/used, and (b) response strategies when suspect or confirmed counterfeit bearings are discovered. Though developed primarily for critical application bearings, the document also may be applicable, at the discretion of the user, to other bearings with similar characteristics and applications. The bearings slash sheet is not intended to replace, conflict with, or duplicate requirements in quality system or AMS series material specs but rather to augment them with regards to counterfeit prevention and risk mitigation.
G-21 Counterfeit Materiel Committee
Bearing, Plain, Self-Aligning, PTFE Lined, NarrowAS21233B (Current)11/26/2025
No scope available.
ACBG Plain Bearing Committee
Bearing, Plain, Self-Aligning, Grooved Outer Ringer PTFE Lined, WideAS21230B (Current)11/26/2025
No scope available.
ACBG Plain Bearing Committee
Verifying large alternate product code for an Joint Aerospace/Ground Vehicle Document document - JAGV01JAGV00000000000000000000000000001_202511 (Current)11/24/2025
Verifying large alternate product code for an Joint Aerospace/Ground Vehicle Document document - JAGV01
Active Safety Systems Standards Committee
Verifying large alternate product code for an AIR document - AIR112425-1AIR1124250000000000000000/NEW1--1 (Current)11/24/2025
Verifying large alternate product code for an AIR document
A-10 Aircraft Oxygen Equipment Committee
Landing Gear Component Heat DamageAIR5913B (Current)11/11/2025
The purpose of this report is to outline types of in-service heat damage that have been observed in high strength steel landing gear components, with an emphasis on a particular type that is referred to as “Ladder Cracking” which can develop in landing gear shock struts. The report discusses how ladder cracking can be detected visually and evaluated by non-destructive inspection methods, and how it can be repaired at overhaul with the prior approval of the Original Equipment Manufacturer. This report also describes the use of a bearing material that has resolved this problem without introducing other problems. Examples of other types of service induced heat damage are also discussed.
A-5B Gears, Struts and Couplings CommitteeNEW
Grease, Aircraft, General Purpose, Low Temperature Range, Lithium ThickenedAMS3052B (Current)09/30/2025
Committee AMS-M is establishing an Industry Managed Qualification Program through the remit of the Performance Review Institute which requires this specification to be revised to reference the qualification process and controlling documentation.
AMS M Aerospace Greases Committee
Bearing, Roller, Needle, Double Row, Heavy Duty, Track Roller, Sealed, Type VI, InchAS21439E (Current)09/19/2025
Scope is unavailable.
ACBG Rolling Element Bearing Committee
BALL BEARINGS.06000204/23/2025
HESS, HENRY
Development of India specific biaxial test cycle for fatigue testing of wheel rims and wheel hub bearings for Heavy Commercial Vehicles2024-26-032201/16/2024
Wheel rims and wheel hub bearings are critical components of Heavy Commercial Vehicle (HCV) suspension systems and are subjected to extensive fatigue loading throughout their operational life. Actual loading conditions on wheels are a combination of radial loads (vertical loads) and cornering loads (lateral loads) acting simultaneously and are directly influenced by payload and road conditions. Currently for Indian usage, there are test guidelines only for separate uniaxial Radial Fatigue Test (RFT) and Cornering Fatigue Test (CFT) for wheel rims which might not represent realistic combined loading conditions, and no generic guidelines are available for testing of wheel hub bearings. There is a biaxial test guideline defined for European usage scenario, but no guidelines defined for Indian usage scenario. Thus, there was a need to define test guidelines for biaxial fatigue testing of wheel rims and wheel hub bearings, based on data acquired for Indian roads and usage conditions, which
Thorat, Omkar A., Bakal, Nikhil R., Kuwar, Virendra S., Pawar, Prashant R., Shinde, Vikram V.
Weight and Drivetrain optimization via Fuel pump & Vacuum Pump drive by engine camshaft in a pushrod type valve actuated engine.2024-26-004601/16/2024
Optimizing weight, cost and friction is critically focused in most modern powertrains. Lesser components in drive trains makes the systems` lightweight and more efficient. This paper explains the idea of integrating a fuel pump and a vacuum pump drive system on to the main camshaft eliminating many rotating & static parts in a two valve per cylinder push-rod type actuated 4-cylinder diesel engine, thereby reducing overall weight, cost and drive losses. The modified camshaft will now drive oil pump, vacuum pump, fuel pump and valve train together. The existing camshaft is extended with a slot at one end and a three lobed cam made of higher grade material is press fitted on to the said portion with an additional journal bearing face added. Proposed camshaft design is evaluated for handling higher power transmission considering multiple drives are connected. Design verification simulations are run including High cycle fatigue, camshaft bearing EHD, Timing drive dynamics to ensure all
John, Shijino Shaji, Sasikumar, K
A UNIVERSAL STEERING GROMMET DESIGN APPROACH TO ENHANCE THE PASSENGER CABIN NVH PERFORMANCE2024-26-020201/16/2024
As a car OEM, we continuously strive to set the bar for competitors with every product. Consumer travel experiences are enhanced by increasing passenger cabin silence. There is only one steering system opening in the firewall panel, which is used for allowing intermediate shaft's fitment on the pinion shaft of the steering gear. The steering grommet is the sole component that covers the firewall cut-out without disrupting steering operations, which has a substantial impact on the NVH performance of the vehicle. It is typically used in cars to eliminate engine noise and dust entering to passenger compartment. The part is assembled inside the vehicle where the steering intermediate shaft passing through BIW firewall panel. We use a bearing, plastic bush, or direct rubber interference design in the steering grommet to accommodate the rotational input the driver provides to turn the automobile. However, occasionally noise may be produced due to uneven bearing or plastic bush loading or a
J, Sadhish, Vijayarangan, Deepak
OPTIMIZATION OF OIL QUANTITY IN MANUAL TRANSMISSION AND REDUCING CHURNING LOSS2024-26-034601/16/2024
Gearbox efficiency losses are contributed by Oil seal rubbing, Synchro friction rubbing, Gear losses, bearing preload friction, windage losses, churning losses etc. Here in this experiment we have focused on quantifying and reducing the churning losses as well as verifying the lubrication requirements satisfactorily in all terrains and conditions. The paper establishes the effective way for evaluating same with over 80 trials conducted for conclusive proof. Gearboxes must work efficiently to get the job done properly and lubrication is vital to this efficiency. Lubricating oil is like the circulation system of a gearbox. If the oil levels fall too low, the gearbox will likely fail. Gearbox failure can lead to expensive repairs that could be prevented. Besides added costs due to replacement or repair, costs associated with a loss of production could be significant. These issues are why it is important to understand the consequences of having low lubricant levels. Similarly, higher oil
Lakshamanan, sundar
Lubrication Evaluation of EV transmission2024-26-032801/16/2024
The advent of EV powertrain has considerable effect on transmission development activities as competed to regular ICE transmission. Conventional ICE transmission and the transmission for an e-powertrain differ on fundamental level. The conventional transmission has number of gear ratios, shift mechanism which enables the transmission to deliver a smooth power output as per demand from the driver. Whereas the e-powertrain transmission is mostly a single gear ratio transmission (reducer) which primarily depends on speed and torque variation from the motor to cater the driver requirement. Hence, the operating speeds of the such e-transmissions can vary from 0 to 20000 in both forward and reverse directions. Such a large speed variation as compared with conventional transmission calls for special attention towards the lubrication of internal components. High speeds and lower oil viscosities tend to disrupt the oil films in between contact surfaces causing metal to metal contact. This
Kushwaha, Rakesh, Bhosale, Vikas, Navale, Pradeep, Patel, Hiral
NVH improvement of the BEV transmission by altering bearing mounting arrangement.2025-01-010405/05/2023
As per metaphor, “The squeaky wheel gets the grease” the transmission of battery electric vehicle (BEVs) gets topmost attention in terms of NVH improvement. While the engine is getting replaced with an almost silent electric motor, the transmission noise appears persistent and demands more silent transmission. This has raised demand for improvement in design as well as manufacturing quality. Various innovations are being done to drive an improvement in the NVH. Following paper will discuss the improvement in NVH achieved through a design innovation in the way bearings are installed and demonstrated a significant amount of improvement. We have used SMT MASTA used as a simulation tool to predict the expected results and a Transmission Dyno test bench in an anechoic chamber to test the NVH performance on physical sample. The innovation was done on a small single speed two stage reduction gearbox coupled with a 100 NM, 14000 RPM battery electric motor. Though the bearings have
Pingale, Abhijeet, Soni, Jaldeep
testing mobilityRxiv application by test1auto testSAE-PP-0673809/02/2022
testing mobilityRxiv application by test1
Mutagaana, Festo
Performance Analysis of Hydrodynamic Journal Bearing Under different Operating Conditions 2022-01-038403/29/2022
Study of vibration, temperature and pressure generation during the running of the engineering application has an important role in designing them, especially working at high speed and high load conditions. A significant portion of research and development today is concentrated on saving energy by reducing friction. In the present discussed the measurement and analysis of the vibration, temperature and pressure generation during the running of the journal bearing. The experiments were performed during the hydrodynamic lubrication regime using SAE 15W-30 lubricating oil. A journal bearing having journal diameter as 22 mm, length/diameter ratio 1 and 0.027 mm radial clearance has been designed and used to test the output responses. Analysis of starting friction and average friction torque during the running of journal bearing was done at 1400, 1600, 1800, and 2000 revolution per minute (rpm) speed of the journal at load value 750 N. The variation of vibration, temperature and with
Sharma, Vipin Kumar, Singh, Ramesh
Evaluation of Fretting Phenomenon in Gearbox and Allied Failures2022-01-078503/29/2022
This paper takes a review of fretting phenomenon on splines of the engaging gears and corresponding splines on shaft of automotive transmission and how it leads to failure of other components in the gearbox. Fretting is a special wear process which occurs at the contact area of two mating metal surfaces when subject to minute relative oscillating motion under vibration. In automotive gearbox, which is subjected to torsional vibrations of the powertrain, the splines of engaging gears and corresponding shaft may experience fretting, especially when the subject gear pair is not engaged. The wear debris formed under fretting process when oxidizes becomes very hard and more abrasive than base metal. These oxidized wear particles when comes in mesh contact with nearby components like bearings, gears etc. may damage these parts during operation and eventually lead to failure. In this paper, a case study is presented wherein fretting has been identified as the root cause of failures of some
Mohire, Sujit, Bhandari, Kiran Kamlakar, Tendulkar, Vishveshvar, Chatterjee, Soumik
Lightweight differential case material and bearing optimization in electric car transmission2022-01-078703/29/2022
This paper presents about idea developed in electric car transmission for transverse application and a torque capacity of 200 Nm to 360 Nm. How current differential case support bearing type is changed with added advantage is discussed. Further, in this paper, effect of change in bearing type is discussed. Detailed study on the effect of change in bearing type is done and also bearing stress and life calculations are computed. Further how current differential case material is changed with added advantage is discussed. Detailed analysis of differential case is done to arrive at feasible lightweight conclusion. Our proposed research methodology is expected to be useful in reducing mass and without reducing desired product life.
Bhat, Muralidhar Suryanarayan
Whirl Analysis of an Overhung Disk Shaft System Mounted on Non-rigid Bearings2022-01-073203/29/2022
Eigenvalues of a simple rotating flexible disk-shaft system are obtained using different methods. The shaft is supported radially by non-rigid bearings, while the disk is situated at one end of the shaft. Eigenvalues from a finite element and a multi-body dynamic tool are compared against an established analytical formulation. The Campbell diagram based on natural frequencies obtained from the tools differ from the analytical values because of oversimplification in the analytical model. Later, detailed whirl analysis is performed using AVL Excite multi-body tool that includes understanding forward and reverse whirls in absolute and relative coordinate systems and their relationships. Responses to periodic force and base excitations at a constant rotational speed of the shaft are obtained and a modified Campbell diagram based on this is developed. Whirl of the center of the disk is plotted as an orbital or phase plot and its rotational direction noted. Finally, based on the above plots
Chowdhury, Sanjib, Joshi, Yashodhan
Effect of Decoration on Windshield Impact Resistance and Novel Decoration Solution Compatible with Chemical Strengthening2022-01-030403/29/2022
Ball bearing impact tests were performed to evaluate impact resistance of laminates with different decoration configurations. Test results showed that laminates made with enamel decorative frit only on Surface 4, significantly outperformed laminates that had enamel on Surface 2. Furthermore, it was found that hybrid laminates, consisting of a standard annealed outer-ply and a thin, chemically strengthened inner-ply with a specially formulated decorative frit which is compatible with the ion-exchange chemical strengthening process, resulted in impact resistance levels that were three times greater than conventional laminates. Details follow.
Cleary, Thomas, Huten, Timothy, Lehuede, Philippe, Joubaud, Laurent, Friske, Mark
Gland Design, O-Ring and Other SealsAS4716D (Current)11/09/2021
This SAE Aerospace Standard (AS) provides standardized gland (groove) design criteria and dimensions for O-ring seal glands for static and dynamic applications, and other seals.
A-6C2 Seals Committee
Gland Design, O-Ring and Other SealsAS4716D-TEST-REC (Historical)11/09/2021
This SAE Aerospace Standard (AS) provides standardized gland (groove) design criteria and dimensions for O-ring seal glands for static and dynamic applications, and other seals.
A-6C2 Seals Committee
BEARING, ROLLER, NEEDLE, TRACK ROLLER INTEGRAL STUD, SEALED, TYPE VIII ANTIFRICTION, INCHAS21440C (Current)10/06/2021
ACBG Rolling Element Bearing Committee
Regulatory Norms and effect on transmission component validation2021-26-046009/22/2021
With the advent of BS VI regulations, automotive manufacturers are required to innovate the powertrains, fuel systems, exhaust and its after treatment systems to meet the regulatory requirements. The exhaust regulations can be met either by reducing the exhaust gases being generated by the engine (attacking the source) or by treating the exhaust gases in after treatment devices. The choice of the opted system varies with the manufacturer. The after-treatment devices such as catalytic converters are generally mounted in the engine compartment to take advantage of high temperature of exhaust gases to yield the reactions. Such an arrangement imposes a lot of thermal load on the peripheral components such as gearshift cables, bearings, oil seals, driveshafts etc. Thermal shields or thermal sleeve are used to address thermal issue and to protect transmission components. System level validation test requirement of transmission need to be re-visited to considering change in environmental
Tongaonkar, Yogesh Manohar, Patel, Hiral, Tendulkar, Vishveshvar, Bhosale, Vikas, halingale, Amol
Development of a Novel Dynamically Loaded Journal Bearing Test Rig2021-01-121809/21/2021
In this work, a dynamically loaded hydrodynamic journal bearing test rig is developed and introduced. The rig is a novel design, using a hydraulic actuator with fast acting spool valves to apply load to a connecting rod. This force is transmitted through the connecting rod to the large end bearing which is mounted on a spinning shaft, simulating a crankshaft journal. The hydraulic actuator allows for fully variable load control and can be used to apply either static load in compression and tension or dynamic loading to simulate engine operation. A variable speed electric motor controls shaft speed and is synchronized to the hydraulic actuator motion to accurately simulate loading from each stroke in a four-stroke cycle. In addition to these dynamically loaded cycles, the journal bearing rig is also capable of controlled static loading. This static loading is used to simulate stop/start engine operation. A high precision torque meter enables direct measurements of journal bearing
Michlberger, Alexander, Bachu, Pruthvi, Bitsis, Daniel Christopher
Using Fourier Analysis and Theoretical Equation to Predict Bearing Raceway Waviness2021-01-103608/31/2021
Large size bearing’s raceway waviness is a most common NVH issue that presenting in manufactured bearing. Unlike small or medium size bearing with its raceway been honed after grinding. Typically, for large size bearing’s raceway are not honed due to its size limitation, unless there are special requirements from customers. Hence, it will inevitably generate great number of waves on the raceway circumference, which lead to a significant source excitation to the system. Although great amount of experiments substantiated that bearing waviness will not affect bearing life. However, annoyance noise is the main reason that customer reject bearings for quality concern. Hence, at the early stage of identifying raceway waviness issue at customer site could prevent from economic loss. Generally, the energy level caused by large size bearing waviness could be distinctive. Testing engineer will capture time domain vibration data by using radial accelerometer cells mounted on the housing for
Chen, George (Huangxing), Dalen, Piet Van, Nijen, Gerrit Van, Wu, Zhengjiang
SAE TOMORROW TODAY: Bear Flag Robotics, Helping Farmers Improve Sustainability1300804/06/2021
Sustainable farming is within reach and Bear Flag Robotics is part of the collage of technology that's making it happen. On the latest episode, we spoke with Igino Cafiero and Aubrey Donnellan, Founders of Bear Flag Robotics, to discuss how the unique business model enables business and farming success. From their days at Carnegie Mellon to the present, the unique perspectives of Cafiero and Donnellan have helped build the Bear Flag Robotics business on diversity of thought, transparency and trust. Discover how they bring these same ideals to business relationships with farmers and how Bear Flag's technology plays a role in safety, productivity and sustainability.
Hineman, Marcie
BEARING, BALL, AIRFRAME, ANTI-FRICTION, EXTRA WIDE, DOUBLE ROW, INTERMEDIATE DUTYAS27647E (Historical)01/12/2021
ACBG Rolling Element Bearing Committee
BEARING, BALL, AIRFRAME, ANTI-FRICTION, EXTRA WIDE, DOUBLE ROW, INTERMEDIATE DUTYAS27647E-TEST-REC (Historical)01/12/2021
ACBG Rolling Element Bearing Committee
Nuts, Self-Locking, Steel High Strength, All Metal 450 °F Use, UN and UNJ Thread FormAS7252A (Current)11/11/2020
This specification covers all metal, self-locking wrenching nuts, plate nuts, shank nuts, and gang channel nuts made of a carbon or low alloy steel.
E-25 General Standards for Aerospace and Propulsion Systems
A Full-System Approach to Maximize Energy Efficiency of a Wheel Bearing2020-01-163110/05/2020
Environmental sustainability is morphing Automotive technical development strategies and driving the evolution of vehicles with a speed and a strength hardly foreseeable a decade ago. The entire vehicle architecture is impacted, and energy efficiency becomes one of the most important parameters to reach goals, which are now not only market demands, but also based on regulatory standards with penalty consequences. Therefore, rolling drag from all bearings in multiple rotating parts of the vehicle needs to be reduced; wheel bearings are among the biggest in size regardless of the powertrain architecture (ICE, Hybrid, BEV) and have a significant impact. The design of wheel bearings is a complex balance between features influencing durability, robustness, vehicle dynamics, and, of course, energy efficiency. Whereas the driving efficiency and durability have always been main drivers for wheel hub designs, the upcoming development of BEVs, which use large battery packs, has introduced
Re, Paolo, Lamboglia, Francesco, Missiaggia, Giorgio
Providing of Sliding Bearings Reliability of Transmissions Gear Wheels of Transport Cars by Optimization of Assembly Tolerances2020-01-223909/15/2020
In the design of gearboxes and transfer boxes of heavy-duty vehicle`s transmissions, sliding bearings are often used as supports for gear wheels. Analysis of the results of statistical processing of gearbox parts failures and transfer boxes of wheeled tractors with a pulling force of 30 kN indicates the need to improve the reliability of the sliding bearings of the gear wheels. Such plain bearings ensure free rotation of the gear wheels in case of the torque transmission absence, and when locked by a clutch, the radial load of the gear wheel is sensed, while operating in the slipping rolling mode. Such units are poorly understood and in the technical literature sources there are no recommendations for their engineering, which often leads to errors when selecting operation gaps and press fitted in gear wheels. The manufacturers of the transmissions assemblies replaced the plain bearings, which in this case are made of metal-ceramic bushes, for roller bearings. Also, the application of
Savchuk, Volodymyr, Kuhtov, Valeriy, Gritsuk, Igor V., Podrigalo, Mikhail, Vychuzhanin, Vladimir, Parsadanov, Igor, Bulgakov, Nickolay, Belousov, Evgen, Vrublevskyi, Roman, Samarin, Oleksandr, Kurnosenko, Daria, Verbovskiy, Valeriy
Balancing Machines - Verification Test RequirementsAS8617 (Current)08/25/2020
This document specifies instructions to verify proper calibration of all balancing machines used for processing gas turbine rotors. Detailed test procedures and test log samples are provided to evaluate the condition of the machine under test. These performance and test requirements may be used for new installations, periodic surveillance, or following repairs that may have affected machine performance. Calibration of the balancing machine is an activity done prior to verification testing and is outside the scope of this document. Troubleshooting of difficulties during the verification tests is also outside the scope of this document; this document is purely an instructive procedure.
EG-1A Balancing Committee
Balancing Machines - Verification Test RequirementsAS8617-TEST-REC (Historical)08/25/2020
This document specifies instructions to verify proper calibration of all balancing machines used for processing gas turbine rotors. Detailed test procedures and test log samples are provided to evaluate the condition of the machine under test. These performance and test requirements may be used for new installations, periodic surveillance, or following repairs that may have affected machine performance. Calibration of the balancing machine is an activity done prior to verification testing and is outside the scope of this document. Troubleshooting of difficulties during the verification tests is also outside the scope of this document; this document is purely an instructive procedure.
EG-1A Balancing Committee
BEARING, BALL, AIRFRAME, ANTI-FRICTION, SELF-ALIGNING, DOUBLE ROW, HEAVY DUTYAS27643D (Current)06/02/2020
ACBG Rolling Element Bearing Committee
BEARING, BALL, AIRFRAME, ANTI-FRICTION, SELF-ALIGNING, DOUBLE ROW, HEAVY DUTYAS27643D-TEST-REC (Historical)06/02/2020
ACBG Rolling Element Bearing Committee
Plain Bearing No-Load Rotational Breakaway Torque MeasurementARP5448/5B (Current)05/26/2020
This test method provides a procedure for measuring no-load rotational breakaway torque of self-lubricating spherical bearings.
ACBG Plain Bearing Committee
Purge Pump Rotor Dynamics subjected to Ball Bearing Inner and Outer Race Wear Defects2020-01-040304/14/2020
The purge pump is used to pull evaporative gases from canister and send to engine for combustion in Turbocharger engines. The purge pump with impeller at one end and electric motor at the other end is supported by the ball bearing assembly. A bearing kinematic model to predict forcing function due to defect in ball bearing arrangement coupled with bearing dynamic model of rotor because of rotating component is proposed in this paper to get accumulated effect on transmitted force to the purge pump casing. Rotor dynamic of purge pump rotor components only produces certain order forcing responses which can be simulated into the multibody software environment knowing the ball bearing geometry parameters hence providing stiffness parameter for rotor system. Wear defects in the ball bearings, such as defects in the inner and outer races, cage, and balls generate different noise types that have asynchronous high-frequency orders and as well as sidebands frequencies due to frequency
Du, Isaac, Shrivastava, Sandeep, Sinha, Ankur
New Seven Speed DCT transaxle and effect of angular positioning of shaft in layout.2020-01-042904/14/2020
This paper presents about new concept developed on 7 speed DCT transaxle for transverse application and a torque capacity of 200 Nm to 360 Nm. How current 6 speed DCT can modified to 7 speed with packaging benefit is discussed. In this paper, discussions are focused about torque carrying parts of transaxle only. Here only single countershaft is used giving lot of packaging advantage and at first glance layout looks like four speed layout, but it is compact layout. Further in this paper effect of angular position of shaft in layout is discussed.. Position of shafts in transaxle layout effects the stress, bending moment and displacement induced in shaft. Detailed study on effect of change in angle with respect to Bending moment, Stress in shaft, Cylindrical roller bearing (CRB) and Deep Groove Ball Bearing (DGBB) Bearing reaction force analysis, life calculations are computed.
Bhat, Muralidhar
Seeing Around Corners to Detect Object ShapesTBMG-3637304/01/2020
A technique was developed that enables reconstruction of images in great detail. Researchers computed millimeter- and micrometer-scale shapes of curved objects, providing an important component to a larger suite of non-line-of-sight (NLOS) imaging techniques.
BEARING, BALL, AIRFRAME, ANTI-FRICTION, HEAVY DUTYAS27640E (Current)03/04/2020
ACBG Rolling Element Bearing Committee
Wheel End Assembly and Axle Spindle Interface Dimensions - Truck and BusJ2475_202002 (Current)02/13/2020
This recommended practice contains dimensions and tolerances for spindles in the interface area. Interfacing components include axle spindle, spindle threads, bearing cones, bearing spacer, seal, and wheel hub. This recommended practice is intended for axles commonly used on Class 7 and 8 commercial vehicles. Included are SAE axle configurations FF, FL, I80, L, N, P, R, U, and W.
Truck and Bus Wheel Committee
BOLT, MACHINE - DOUBLE HEX EXTENDED WASHER HEAD, PD SHANK, UNS N07718 - 185 KSIAS3580A (Current)12/10/2019
E-25 General Standards for Aerospace and Propulsion Systems
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