Browse Topic: Hydraulic drives

Items (32)

Selection of Rational Parameters of Automated System of Robotic Transmission Clutch Control on the Basis of Simulation Modelling

2019-01-00291/15/2019

The article deals with the analysis of one of the methods of selecting rational parameters of automated clutch control system for robotic transmission. The objective is to select rational parameters of automated clutch control system for robotic transmission, equipped with electropneumatic actuating mechanism on the basis of mathematical simulation. The depicted mathematical simulation of the clutch control system is characterized by the possibility to coordinate the algorithm of control unit with the dynamic processes in the execution device. The new functional interrelations between the elements of the electro-pneumatic actuator are mathematically described. The way to the selection of rational parameters of an automated control system for clutch is recommended; the selection taking into account the features of the electro-pneumatic actuator. Using the mathematical modeling method, rational control parameters of the automated clutch control system are determined. Based on comparative experimental researches, an inaccuracy is calculated for the mathematical modeling of the processes taking place in the electro-pneumatic actuator of a robotic transmission. Analysis of the results of mathematical modeling allowed finding factors that give a competitive advantage in comparison with automated clutch control systems that are used for commercial purposes.

Mikhalevich, Mykola, Yarita, Alexandr, Leontiev, Dmitry, Gritsuk, Igor V., Bogomolov, Viktor, Klimenko, Valeriy, Saravas, Viktoriya

The Fault-Augmented Approach for the Systematic Simulation of Fault Behavior in Multi-Domain Systems in Aerospace

2018-01-191710/30/2018

A library for modelling faults in multi-domain physical systems is introduced. The library is based on the simulation of fault effects on the system’s behavior. The motivation of how and why to model faults systematically as well as a description of the Modelica®-based library structure with a wizard supporting the semi-automatic augmentation process of faults are outlined. The fault types are classified into continuous and discrete with dedicated type definitions. The application of the Fault library is exemplified in the field of aerospace electrohydraulic actuator. The actuator is equipped with hydromechanical, electrical and digital systems for mitigating failures, which should be tested at an early stage of design. To perform the tests, a multi-domain, dynamic system model is created, wherein failures are systematically simulated using a special approach for fault augmentation. In addition, several complementary tests are obtained by a variants simulation and the simulation results of the fault augmented model are analyzed and using supervised machine learning classifier are demonstrated. Different classification algorithms were compared to each other and analyzed. The accuracy of an appropriate machine learning classifier is analyzed in detail to classify several faults from different domains and to localize their impact by changing a control mode. The selection of relevant output values for the fault classification in the electrohydraulic control system is executed based on the extraction of the feature’s importance.

Kolesnikov, Artem, Andreev, Maxim, Abel, Andreas

Modeling and Analyzing for Hydraulic-Driven Cooling System of Heavy Duty Truck

2016-01-02224/5/2016

The heavy duty trucks have large engine power and drive continuously in mountainous area, so the heat dissipation of engine is very important. In the traditional cooling system with fixed transmission ratio fan, the cooling capacity is insufficient and the engine is easy to be over-heated when the engine is working in low speed and heavy load conditions. Owning to the bigger size of electric motor compared to the hydraulic motor, it is not suitably applied to the heavy duty trucks. Contrasted with the electric motor, the hydraulic drive cooling system is widely applied in heavy duty trucks due to smaller size, larger power, continuous speed modulation and flexible installation location. However, the low transmission efficiency of the pump-motor system results in high power consumption of the cooling system. In this paper, the mathematical and simulation model of hydraulic-driven fan cooling system is established for the specific engine. The study applies the digital PID controller of continuous system to control the fan. The control algorithm of anti-integral saturation is compared with the conventional method. The results show that during the time progress of 700s, the mean power consumption with anti-integral algorithm respectively reduce by an average of 40.8%, 35.1% and 29.2% in the target temperature of 363.15K, 364.15K, and 365.15K compared with the traditional control method. Moreover, the PID control with anti-integral algorithm can improve the temperature control accuracy and effectively avoid the excessive cooling.

Zhang, Xingyu, Yang, Bo, Tan, Gangfeng, Mei, Binyu, Li, Zhilei, Yang, Zhongjie, Wang, Can

The Increasing Use of Electrical Actuators in the Aerospace and Defense Industry

TBMG-22669

8/1/2015

Hydraulic and pneumatic systems have traditionally been the market leader in providing power in the aerospace and defense industry because of their low cost and high power density. But in recent years, attention has been focused on the limitations of hydraulic actuators, including their weight, performance, and high maintenance requirements, as well as concerns over their vulnerability due to security issues and other risks.

SAE Off-Highway Engineering 2001-10-01

OFHOCT0110/1/2001

More with less through electronic components Off-highway engineers have had to walk a precarious path in recent years by developing engine technologies that offer customers better vehicle performance and regulators lower emissions. The promises and problems of electrohydraulics Engineers acknowledge that electrohydraulics are the way of the future for the off-highway industry, and that the field itself could use a good public-relations campaign to attract more engineering students. Deere goes all out for agriculture To some, it may seem odd that John Deere picked this particular economy to launch over 50 new products, the most in its 164-year history. To others it reeks of confidence. Switching control in hydraulic drives Researchers from Johannes Kepler University believe agricultural machinery can be improved by further advances in motion generation.

Improved Reliability Brake Pneumatic Drive

2000-01-26399/11/2000

The main requirements to which the brake system of a vehicle should respond are provision of the standard operation speed and protection features of the control pneumatic drive in case of a malfunction of any of its elements. The article describes a design of modified pneumatic brake drive having improved protection properties in case of damage of a diaphragm of any brake chambers, and methodology of parameter optimization of such drive allowing to create a layout of drive assemblies with the necessary operation speed for MAZ truck-based road trains.

Uspenskiy, Alexander, Pavlovich, Alexander

Symbols for Hydrodynamic Drives

J640_200003 (Historical)3/10/2000

The following system of symbols is recommended for use in technical papers and engineering reports dealing with hydrodynamic drives.

Automatic Transmission and Transaxle Committee

New Machine Concept for Hydroforming Tubes and Extrusions, Part 1

1999-01-06783/1/1999

By inner pressure hydroforming a great variety of parts can be produced. This is especially true when forming tubes in a single action press with high closing forces. In cooperation with industrial companies at the Institute for Metal Forming Technology of the University of Stuttgart, Germany, a new concept for presses specially designed for hydroforming tubes and extrusions was developed. The press has a capacity of a 3500 tons closing force and a press table size of 2500 mm × 900 mm. A great reduction in costs can be achieved by integrating spacers between the frame of the press and the ram. This paper introduces this new press and discusses different press concepts for hydroforming tubes and extrusions.

Siegert, K., Schwager, A., Rieger, R., Häussermann, M.

Computer Analysis of an Axial Piston Pump Port Plate

9618338/1/1996

A hybrid (hydrostatic and hydrodynamic) model applicable to thrust bearing and hydraulic machine port plate is presented here. The model is based on Reynolds equation and variable viscosity effect is considered. Assumptions made are listed. Regardless of the assumptions, the model agrees with experimental results and can be used with minor restrictions for new hydraulic machines' and bearing design. Balance factor as a function of speed of rotation, gap height, barrel inclination and fluid viscosity is presented. The variable viscosity effect makes analysis more accurate for certain conditions when port plates' failures are likely.

Sorokine, Michael A.

Laboratory Evaluation of Simple Tillage Tools at High Speed

9521289/1/1995

The performance of simple tool shapes in terms of draft with speed of operation was evaluated in the soil bin facility of the Department of Agricultural and Bioresource Engineering, University of Saskatchewan. A hydraulic driven monorail system was developed, which was capable of speeds up to 10 m/s. The results showed that the disturbed soil remained close to the cutting path, and the elliptical shape exhibited the lowest draft increment with speed.

Rosa, Uriel A., Kushwaha, R. Lal

V-22 Osprey Tiltrotor Blade-Fold/Wing-Stow System Design and Testing

92195410/1/1992

The Bell-Boeing V-22 Osprey is a tiltrotor aircraft that operates like a helicopter when taking off, and as a turboprop airplane when in high-speed forward flight. It is currently under development by the tiltrotor team of Bell Helicopter Textron, Inc., Fort Worth, TX, and Boeing Defense and Space Groups Helicopter Division, Philadelphia, PA. The V-22 is a multimission aircraft designed for use by all four U.S. armed services. Of all the service requirements, one of the most demanding comes from the Navy and Marine Corp requirement for shipboard compatibility. The V-22 aircraignificant challenge to the V-22 design team, is the requirement to fully stow the Osprey below deck on an LHA claft incorporates several unique design features to meet these shipboard requirements. One such feature, which has been a sss Navy carrier. The V-22 incorporates a blade-fold/wing-stow (BF/WS) system to meet this stowing requirement. In this paper, the control system and individual components that perform the BF/WS operations are described, as well as the functional requirements for the unique design features of the BF/WS system. In addition, the results of tests completed to date are given.

Olson, Rohn

How the Variation of Chemical Composition of Diesel Fuel Affects the Operation of a Kind of Engine from the National Market

9117119/1/1991

The constant needs for planning on energy subject in any country, are mainly based on making the best use of available raw materials, keeping up the fuel quality in the market and promoting the production of high added value products.- With regard to diesel fuels, refining worldwide trends together with the arrival of various raw materials, have been pressing negatively on the quality of these fuels used in fast diesel engines, fact to be studied in order to obtain the optimum equation “Quality/Operation”.- The present work has specifically studied four alternative fuel formulations in comparison with the respective reference diesel oils currently used in Argentina and whose general features permit an international standard resemblance. Engine operating characteristics have been defined as a function of the variation in the fuel chemical composition.-

Nadal, Lia Ester, Varales, Ricardo, Monros, Antonip, Levrino, Juan Carlos

Low-Speed, High-Torque Radial Piston Hydraulic Motors; The New Generation

851538

9/1/1985

The Low-Speed, High-Torque (LSHT) radial piston hydraulic motor was first introduced in 1896. While it was relatively efficient, very little improvement of the basic design was seen for almost 60 years. As a consequence, the acceptance of the units as a viable alternative to the conventional drive system of a high speed power source coupled to a multi-stage speed reducer was very limited. It was not until the mid 1950's that the second generation designs produced commercially available models that had improved both reliability and performance to the point of gaining true market acceptance. No longer seen as an alternative, the LSHT motor drive was recognized as an improvement over the conventional system in a rapidly expanding number of applications. In subsequent years the numbers of manufacturers grew, each with their own approach to applying the radial piston concept. However, hydraulic pump technology outpaced LSHT motor technology and machine designers found themselves with highly efficient, high pressure pumps and low to moderate pressure motors. It has only been in the past couple of years that the LSHT radial piston motor developments have permitted this vital system drive to keep pace with the modern high pressure axial piston pumps. Today, the hydraulic system designer can take full advantage of the power and torque capabilities in a compact, efficient drive system. This evolution, as it relates to the design and performance of the new Rotary Power SMA high pressure LSHT motor will be reviewed from the concept to the applications. It is the new generation.

Smith, J. W.