scholarly journals Design and Test of Dual Actuator Nose Wheel Steering System for Large Civil Aircraft

2016 ◽  
Vol 2016 ◽  
pp. 1-14 ◽  
Author(s):  
Ming Zhang ◽  
Rongmin Jiang ◽  
Hong Nie
Keyword(s):  
Servo System ◽  
Steering System ◽  
Design Parameters ◽  
Hydraulic Pressure ◽  
Test Results ◽  
Handling Characteristics ◽  
Steering Mechanism ◽  
Civil Aircraft ◽  
Ground Handling ◽  
Electrohydraulic Servo System

In order to improve aircraft ground handling characteristics and airport working efficiency, large handling angle and torque are requested for the nose wheel steering system of large civil aircraft. A following swivel selector valve is firstly designed to meet the demand for the hydraulic pressure commutating as soon as the dual actuator nose wheel steering mechanism passes through its dead center position. Considering the multiple objective functions of nose wheel steering mechanisms, those core design parameters are multiobjective optimized. A nose wheel steering electrohydraulic servo system with handling and antishimmy functions is designed for the steering mechanism. Then the prototypes of the steering mechanism and electrohydraulic servo system are researched to validate the design. Using the swing actuator to provide the load torque and ground excitation, the steering test bench is prepared to test the system working. The steering test and the antishimmy test are conducted to verify the functions of the system. The test results, such as steer angle, steer torque hydraulic pressure, and antishimmy torque, are analyzed in detail and compared with the theoretical results. The results show that the property of the prototype achieves the design objectives, such as work mode, steer angle, and steer torque.

Design and co-simulation of a nose wheel steering system for a civil aircraft

2021 ◽  
pp. 095441002110317
Author(s):  
Dawei Li ◽  
Mingxing Lin ◽  
Tao Zhang
Keyword(s):  
Hydraulic System ◽  
Steering System ◽  
Air Transport ◽  
Design Parameters ◽  
Control Law ◽  
System A ◽  
Steering Mechanism ◽  
Civil Aircraft ◽  
Design Requirements ◽  
The Mathematical Model

In order to automate the ground maneuvering of a civil regional aircraft and improve the efficiency of the air transport system, a fly-by-wire nose wheel steering system (NWSS) was designed. A rack and pinion steering mechanism integrated with a single actuator mechanism was proposed. The basic control circuit diagram with integrated test, the electro-hydraulic system diagram, and the mathematical model of the steering system were established and analyzed. A co-simulation model of the system was built to verify the control law. The results show that the properties of the prototype meet the design requirements. Given the importance of the NWSS, the simulation results can be used to optimize the basic design parameters. This methodology can also be used for other types of aircraft.

A New Hydraulic Power Steering System for Hybrid City Bus

2013 ◽  
Vol 321-324 ◽  
pp. 1562-1565 ◽  
Author(s):  
Zhen Lin Yang ◽  
Ren Guang Wang ◽  
Lin Tao Zhang ◽  
Chao Yu ◽  
Guang Kui Shi ◽  
...  
Keyword(s):  
Steering System ◽  
Steering Wheel ◽  
Hydraulic Pressure ◽  
Power Steering System ◽  
City Bus ◽  
Power Steering ◽  
Steering Mechanism ◽  
New Type ◽  
Type Power ◽  
Hydraulic Power Steering

A new type power steering system was developed for electric hybrid city bus. It is mainly composed of fluid reservoir, electric motor, steering pump, safety valve, solenoid, pressure sensor, hydraulic cylinder, braking air tank, controller, steering wheel, steering angle sensor, steering control valve, mechanical steering mechanism, steering power cylinder. Its main idea is based on using of pressure from braking air tank to push a cylinder to generate hydraulic pressure. It can provide enough pressure for steering needing timely. And the steering pump does not need working at the time of no steering requirement. The application of a new type power steering system can save energy to improve fuel efficiency.

Modeling and Analysis of a Self-Steering Axle for Heavy Vehicles

2018 ◽  
Author(s):  
Damon Delorenzis ◽  
Beshah Ayalew
Keyword(s):  
Steering System ◽  
Design Parameters ◽  
Heavy Vehicles ◽  
Vehicle Performance ◽  
Modeling And Analysis ◽  
Damping Characteristics ◽  
Traditional Design ◽  
Steering Mechanism ◽  
Stiffness And Damping ◽  
Market Pressures

Self-steering axles installed on commercial (heavy) vehicles offer important benefits, including improvements to vehicle performance such as off-tracking reduction and improved maneuverability, as well as reduction in pavement wear and damage that otherwise can result from the operation of heavy vehicles on the roadway. Traditional design methods for self-steering axles include empirical and trial-and-error methods to set steering mechanism design parameters based on known design baselines and prior experience. While the design of self-steering axles has not changed very much since their introduction, increasingly regulations and competitive market pressures have promoted the need for new designs to improve the performance of self-steering axles and differentiate new product offerings such as a new integrated steering knuckle concept which provides steering return stiffness and damping using a non-traditional design. This paper introduces models useful in the analysis of the steering return stiffness and damping performance of self-steering axle systems and shows how to identify the steering stiffness and damping characteristics that provide acceptable performance for these systems. The paper offers reduced order models that capture the self-steering axle’s shimmy behavior and discusses how to arrive at acceptable steering and damping characteristics. It presents results of the evaluations of the steering system performance including with comparisons between physical testing and simulations with a self-steering axle installed on a commercial vehicle.

PROJECT ON ELECTRONIC STEERING SYSYTEM

2018 ◽  
Vol 4 (5) ◽  
pp. 7
Author(s):  
Shivam Dwivedi ◽  
Prof. Vikas Gupta
Keyword(s):  
Steering System ◽  
Essential Elements ◽  
Variable Pressure ◽  
Passenger Cars ◽  
Control Techniques ◽  
Steering Mechanism ◽  
Dynamics And Control ◽  
Active Research ◽  
Electronic Steering ◽  
And Control

As the four-wheel steering (4WS) system has great potentials, many researchers' attention was attracted to this technique and active research was made. As a result, passenger cars equipped with 4WS systems were put on the market a few years ago. This report tries to identify the essential elements of the 4WS technology in terms of vehicle dynamics and control techniques. Based on the findings of this investigation, the report gives a mechanism of electronically controlling the steering system depending on the variable pressure applied on it. This enhances the controlling and smoothens the operation of steering mechanism.

scholarly journals Delay compensation based controller for rotary electrohydraulic servo system

2021 ◽  
Author(s):  
Zakarya Omar ◽  
Xingsong Wang ◽  
Khalid Hussain ◽  
Mingxing Yang
Keyword(s):  
High Frequency ◽  
Dead Time ◽  
Sliding Mode ◽  
Servo System ◽  
Smith Predictor ◽  
Delay Compensation ◽  
Mechanical Parts ◽  
System Output ◽  
Electrohydraulic Servo System ◽  
The Stability

AbstractThe typical power-assisted hip exoskeleton utilizes rotary electrohydraulic actuator to carry out strength augmentation required by many tasks such as running, lifting loads and climbing up. Nevertheless, it is difficult to precisely control it due to the inherent nonlinearity and the large dead time occurring in the output. The presence of large dead time fires undesired fluctuation in the system output. Furthermore, the risk of damaging the mechanical parts of the actuator increases as these high-frequency underdamped oscillations surpass the natural frequency of the system. In addition, system closed-loop performance is degraded and the stability of the system is unenviably affected. In this work, a Sliding Mode Controller enhanced by a Smith predictor (SMC-SP) scheme that counts for the output delay and the inherent parameter nonlinearities is presented. SMC is utilized for its robustness against the uncertainty and nonlinearity of the servo system parameters whereas the Smith predictor alleviates the dead time of the system’s states. Experimental results show smoother response of the proposed scheme regardless of the amount of the existing dead time. The response trajectories of the proposed SMC-SP versus other control methods were compared for a different predefined dead time.

Estimation of Seismic Energy Dissipation for Steel Slit Shear Walls Considering Out-of-Plane Buckling

2021 ◽  
Author(s):  
Yiming Ma ◽  
Liusheng He ◽  
Ming Li
Keyword(s):  
Energy Dissipation ◽  
Shear Walls ◽  
Seismic Energy ◽  
Thickness Ratio ◽  
Design Parameters ◽  
Test Results ◽  
Loading Test ◽  
Aspect Ratios ◽  
Out Of Plane ◽  
Energy Dissipation Capacity

Steel slit shear walls (SSSWs), made by cutting slits in steel plates, are increasingly adopted in seismic design of buildings for energy dissipation. This paper estimates the seismic energy dissipation capacity of SSSWs considering out-of-plane buckling. In the experimental study, three SSSW specimens were designed with different width-thickness ratios and aspect ratios and tested under quasi-static cyclic loading. Test results showed that the width-thickness ratio of the links dominated the occurrence of out-of-plane buckling, which produced pinching in the hysteresis and thus reduced the energy dissipation capacity. Out-of-plane buckling occurred earlier for the links with a larger width-thickness ratio, and vice versa. Refined finite element model was built for the SSSW specimens, and validated by the test results. The concept of average pinching parameter was proposed to quantify the degree of pinching in the hysteresis. Through the parametric analysis, an equation was derived to estimate the average pinching parameter of the SSSWs with different design parameters. A new method for estimating the energy dissipation of the SSSWs considering out-of-plane buckling was proposed, by which the predicted energy dissipation agreed well with the test results.

The Mechanism and Solution of Harmonic Gear Whine Noise in Automotive Transmission Systems

2007 ◽  
Author(s):  
Jaegon Yoo ◽  
Koo-Tae Kang ◽  
Jin-Wook Huh ◽  
Chimahn Choi
Keyword(s):  
Surface Structure ◽  
Design Parameters ◽  
Test Results ◽  
Gear Noise ◽  
Transfer Path ◽  
Gear Design ◽  
Automotive Transmission ◽  
Wave Patterns ◽  
Tooth Modification ◽  
Harmonic Noise

Since gear noise in automotive is one of the most unpleasant noises for passengers, various solutions, such as gear design optimization, tooth modification and transfer path reformations in the vehicle have been developed. But, these attempts are mainly focused on the fundamental mesh excitation of the gear set without any consideration of their harmonic noise (1st, 2nd or higher). Harmonic gear whine noise is easily audible in the vehicle because of their high frequency characteristics in spite of low sound pressure level. This annoying pure-tone noise is usually issued in the transmission system composed of the gears produced by grinding process. This paper will present the main sources of this harmonic gear whine noise with the test results of gears with identical design parameters but having different surface structure (roughness parameters, wave patterns). Additionally, manufacturing guidelines of gear surface structure will be proposed at the end of this paper.

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