Helicopters in high-speed forward flight often generate High-Speed Impulse (HSI) noise, presenting a major challenge for noise control and narrowing the range of helicopter use. This paper proposes a novel method for active noise reduction by adjusting the rotor diameter length, effectively delaying HSI noise onset and reducing HSI noise impact. Utilizing the CLORNS solver and the Ffowcs Williams-Hawkings (FW-H) equation, this approach was tested on the AH-1G rotor through simulation analysis. The study simulated the rotor's dynamic diameter length changes, analyzing the effect of crucial parameters on the sound field. Results indicate that this method significantly controls the production of rotor high-speed pulse noise, achieving a noise reduction of up to 2dB at critical operational points. This research aids in formulating specific rotor noise control laws and expands the range of scenarios for helicopter usage.

Ding, Yan, Zhao, Guoqing, Wang, Bo, Zhao, Qijun, Chen, Xi

RM13006 - Process Control Methods

AESQRM0062021099/7/2021

AS13100 AESQ Quality Management System Requirements for Aero Engine Design and Production Organizations Standard was created to replace customer specific quality requirements – leading to simplification and harmonization between engine manufacturer supply chains. AS13100 is supported by a series of 13 AESQ Reference Manuals (RM) that provide additional detail on certain subjects to describe the intent of the standard and to provide guidance on deployment. The Reference Manuals are designed to enable the supply chain to deploy the AS13100 requirements efficiently and effectively. The AESQ RMs provide case studies, guidance material, forms and checklists specific to each section of the standard to aid the user with implementation.

Aerospace Engine Supplier Quality Strategy Group

Assembly and Soldering Criteria for High Quality/High Reliability Soldering Wire and Cable Termination in Aerospace Vehicles

AS4461D (Current)

7/23/2021

This standard is applicable to manual soldering and machine soldering processes utilizing controlled soldering devices, for electrical connections for wiring and cabling used in aerospace vehicles. Description of a component or device herein is not to be construed as authorizing the use of the component or device.

AE-8A Elec Wiring and Fiber Optic Interconnect Sys Install

ARP6400 (Current)6/7/2021

This ARP specifies the recommended methods of handling silver coated conductors and shield, by the conductor fabricator, wireinsulator, distributors, harness or assembly houses, and OEM’s. Red Plague mitigation depends upon each link in the chain of supply handling the wire and cable properly.

AE-8D Wire and Cable Committee

Chord Method of Evaluating Surface Microstructural Characteristics

ARP1820C (Current)

5/19/2021

This practice provides a method for evaluating microhardness and microstructure very close (0.002 inch (0.051 mm) or less) to the surface of a disk specimen. Specific accept/reject criteria for partial decarburization (3.7.1), inadvertent carburization/nitriding (3.7.3), total decarburization/intergranular oxidation (3.8), and other characteristics evaluated are to be found in the applicable specification where this ARP is referenced.

AMS E Carbon and Low Alloy Steels Committee

Metal Powder Feedstock Size Classifications

AMS7025 (Current)

4/22/2021

This specification covers particle size classifications and corresponding particle size distribution requirements for metal powder feedstock conforming to a classification.

AMS AM Additive Manufacturing Metals

Aluminum Alloy, Castings 5.0Si - 1.2Cu - 0.50Mg (355.0-T51) Precipitation Heat Treated

AMS4210M (Current)

4/22/2021

This specification covers an aluminum alloy in the form of castings.

AMS D Nonferrous Alloys Committee

Cast Aluminum Alloy Composite 4.6Cu - 3.4Ti - 1.4B - 0.75Ag - 0.27Mg (205.0/TiB2/3p-T7P) Investment Cast, Solution and Precipitation Heat Treated

AMS4471B (Historical)

4/22/2021

This specification covers a dilute aluminum/TiB2 metal matrix composite in the form of investment castings.

AMS D Nonferrous Alloys Committee

RM13006 - Process Control Methods

AESQRM0062021033/8/2021

Aerospace Engine Supplier Quality Strategy Group

Application of Selective Assembly as an Aerospace Design for Manufacturing and Assembly Principle for Effective Variation Management in Aerospace Assemblies

2021-01-00053/2/2021

Aerospace engine parts are complex precision-engineered products with tighter assembly tolerances produced by conventional and non-conventional manufacturing processes. Variations in these manufacturing processes have to be controlled, process risks mitigated, and managed effectively, to facilitate the ease of aero-engine assembly to reduce overall variation and improve the assembly quality. One such technique is the application of the Selective Assembly as a Design for Manufacturing and Assembly (DfMA) tool. The paper details the methodology of Selective Assembly, its applications, benefits, and limitations in the aerospace industry along with a framework case study with a focus on ease of assembly and meeting the design intent of the assembly fit with the detailed study on the current traditional assembly process. The focus is to analyze the current challenges faced on the application of the Selective assembly of Aero-engine components through a case study on the development and application of an Assembly Installation Operation Selective (AIOS) assembly tool, that be applied both as a built-in tool for Selective Assembly data acquisition and optimal selection. The study also investigates whether the concept of decimal roundoff in the measurement reporting process has any significant impact on the selective process capability and the pin-hole assembly fit quality. The objectives are to optimize and enhance the current assembly process to meet the customer design intent and First Time Right (FTR) quality of the assembly fit and to promote the application of the Selective Assembly concept as a potential quality and cost optimization technique in assembly processes highly subjected to variations by emphasizing its application as an Aerospace Design for Manufacturing and Assembly (ADFMA) guideline for effectively controlling and mitigating assembly variations of shafts and holes in aerospace engine parts and reducing reworks and rejections in the aerospace industry due to high process variability and need for better process control in fabrication tolerances.

Rajamani, Mani Rathinam

Utilizing Casting Technologies on Legacy Part

F-0076-2020-16279

10/5/2020

Sikorsky has developed a specification outlining the use of three casting technologies: simulation, additive manufacturing of the mold and low pressure casting. This specification has been used in the past on new development projects with positive results, reducing lead times and number of pours to produce a useable part. When the S-92 program needed to develop a second source for a casting, they worked with Magellan Aerospace to implement the specification. The project proceeded on time with all castings able to be used. Some elements of the specification were modified to work with a legacy part design, including the use of statistical process controls to reduce variability in crucible pouring.

Woodworth, Heather, Featheringham, Andrew

LSR Technology: A New Dimension in Design of Medical Devices

TBMG-37349

8/1/2020

Today’s medical device manufacturers are facing changing and more challenging requirements for their products. Users are demanding less-invasive devices, and in some cases, wearable devices that are robust and long lasting. Regulations are becoming ever more stringent and costly, especially in terms of biodegradability. Yet at the same time, device manufacturers want to meet user demands by including the latest technologies, while keeping their costs under control.

Cable, Thermocouple Extension, Shielded and Unshielded

AS5419B (Current)

6/2/2020

This SAE Aerospace Standard (AS) covers the requirements for thermocouple extension cable. Manufacturers of primary thermocouple wire in accordance with this specification must be qualified to the similar wire type specified in Table 1.

AE-8D Wire and Cable Committee

Chromaticity Requirements for Ground Vehicle Lamps and Lighting Equipment

J578_202004 (Current)

4/29/2020

This SAE Standard defines and provides a means for the control of colors employed in motor vehicle external lighting equipment, including lamps and reflex reflectors. The document applies to the overall effective color of light emitted by the device in any given direction, and not to the color of the light from a small area of the lens. It does not apply to pilot, indicator, or tell-tale lights.

Lighting Standard Practices Committee

INSULATION SLEEVING, ELECTRICAL, HEAT SHRINKABLE POLYTETRAFLUOROETHYLENE

AS23053/12A (Historical)4/21/2020

AE-8D Wire and Cable Committee

Understanding the Implications of 5G Cellular

TBMG-361523/1/2020

The hype machine is in full swing with the latest standard in mobile telephony — 5G. This is the fifth generation of wireless, mobile broadband communications. It should not be confused with 5 GHz Wi-Fi, which is sometimes erroneously referenced as 5G. This 5G is a whole new ballgame and promises to be a revolution in how we live our daily lives — not merely an evolution of versions past.

Copper Strengthens 3D-Printed Titanium

TBMG-361903/1/2020

Titanium alloys used in additive manufacturing often cool and bond together in column-shaped crystals during the 3D printing process, making them prone to cracking or distortion. And unlike aluminum or other commonly used metals, there is no commercial grain refiner for titanium that manufacturers can use to effectively refine the microstructure to avoid these issues.

Q&A: Solid Silk - A Biocompatible, Sustainable, Degradable Building Block

TBMG-361753/1/2020

David Kaplan, Stern Family Professor of Engineering at Tufts University’s College of Engineering, and his team have developed a unique and practical method for processing silk into solid form for products such as rods and plates for medical implants.

Measurement Uncertainty and Consumer Risk

AIR6553 (Current)

2/3/2020

This document addresses measurement uncertainty and consumer risk as they relate to AS8879 thread inspection. It describes the rationale, theory and methodology used to generate the technical content of the AS5870. The document describes how to calculate measurement consumer risk. It documents all of the calculation methods which industry employs today to calculate what is commonly called measurement uncertainty (Appendices A, B, C, D, E and F). These, in turn, are used to calculate measurement uncertainty ratios which are required inputs to calculate measurement consumer risk. Users of this document can apply the information described herein for the evaluation of the capability of their measurements based on the measurement consumer risk. It involves the analysis of the measurement (product) distribution and biases of both the product and measurement system distributions. It protects the consumer from the worst case distribution results.

E-25 General Standards for Aerospace and Propulsion Systems