scholarly journals Vertical vibration attenuation for truck’s suspension seat by adjusting air spring stiffness

2019 ◽  
Vol 24 ◽  
pp. 47-52
Author(s):  
Pornporm Boonporm ◽  
Kriattisak Houdjaroen ◽  
Thanarat Baumart
Keyword(s):  
Vertical Vibration ◽  
Spring Stiffness ◽  
Air Spring ◽  
Vibration Attenuation

Experimental study on vertical vibration characteristics of medium-low speed maglev vehicle when standing still on steel beams

2021 ◽  
pp. 095440972110324
Author(s):  
Miao Li ◽  
Xiaohao Chen ◽  
Shihui Luo ◽  
Weihua Ma ◽  
Cheng Lei ◽  
...  
Keyword(s):  
Coupled System ◽  
Vertical Vibration ◽  
Vibration Characteristics ◽  
Steel Beams ◽  
Steel Beam ◽  
Air Spring ◽  
Low Speed ◽  
Maglev Vehicle ◽  
Excited Vibration ◽  
Eigen Frequencies

Levitation stability is the very basis for the dynamic operation of Electromagnetic Suspension (EMS) medium-low speed maglev trains (MSMT). However, self-excited vibration tends to occur when the vehicle is standing still above the lightweight lines, which remains a major constraint to the promotion of medium-low speed maglev technology. In order to study the vertical vibration characteristics of the coupled system of MSMT when it is standing still above lightweight lines, levitation tests were carried out on two types of steel beams: steel beam and active girder of the turnout, with a newly developed maglev vehicle using levitation frames with mid-set air spring. Firstly, modal tests were carried out on the steel beam to determine its natural vibration characteristics; secondly, the acceleration signals and the dynamic displacement signals of the air spring obtained at each measurement point were analyzed in detail in both the time and frequency domains, and the vertical ride comfort was assessed by means of the calculated Sperling index. Subsequently, theoretical explanations were given for the occurrence of self-excited vibration of coupled system from the perspective of the vehicle-to-guideway vibration energy input. Results show that the eigen frequencies of the vehicle on the steel beam and the turnout are 9.65 Hz and 2.15 Hz, respectively, the former being close to the natural frequency of the steel beam while the latter being close to the natural frequency of the air spring suspension system, thus causing the self-excited vibration of the coupled system. It is recommended to either avoid the main eigen frequencies of the coupled system or to increase the damping of the corresponding vibration modes to guarantee a reliable coupled system for its long-term performance. These results may provide valuable references for the optimal design of medium-low speed maglev systems.

scholarly journals Suppressing Vertical Vibration in Railway Vehicles through Air Spring Damping Control

2007 ◽  
Vol 1 (2) ◽  
pp. 212-223 ◽  
Author(s):  
Yoshiki SUGAHARA ◽  
Tadao TAKIGAMI ◽  
Akihito KAZATO
Keyword(s):  
Vertical Vibration ◽  
Air Spring ◽  
Railway Vehicles ◽  
Damping Control

scholarly journals Optimization and Performance Analysis of Rail-Train Coupling System with Inerters

Complexity ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Shichang Han ◽  
Xian Wang ◽  
Chunxi Yang ◽  
Guowei Xie ◽  
Zhongcheng Qiu ◽  
...  
Keyword(s):  
Vertical Vibration ◽  
Ride Quality ◽  
Particle Swarm Algorithm ◽  
Suspension Parameters ◽  
Rail System ◽  
Coupling System ◽  
Vibration Attenuation ◽  
And Performance ◽  
Vibration Performance ◽  
Optimization And Performance

Optimization for vertical vibration performance of a rail-train coupling system is investigated in this paper with the introduction of inerters for both primary and secondary suspensions. A model of a typical Chinese passenger train that travels on a traditional rail with track, sleepers, and ballast is simulated. The goal is to improve the ride quality for the train and vibration attenuation for the rail system in response to track irregularities. Optimizations for only inertance and all suspension parameters are carried out by the particle swarm algorithm (PSO). Performance benefits for both the train and the rail system are demonstrated and suspension layouts with inerters connected in parallel and series are compared with the traditional one in both time domain and frequency domain.

B31 Active Control of Vertical Vibration of Pneumatic Air Spring For Rail Train using Acceleration, Velocity and Flow Rate Feedbacks

2009 ◽  
Vol 2009.11 (0) ◽  
pp. 470-473 ◽  
Author(s):  
Tomonori KATO ◽  
Daisuke SHINAGAWA ◽  
Kotaro TADANO ◽  
Kenji KAWASHIMA ◽  
Toshiharu KAGAWA
Keyword(s):  
Active Control ◽  
Flow Rate ◽  
Vertical Vibration ◽  
Air Spring

Analysis and Prediction of Ground Vibration Induced by High-Speed Train

2013 ◽  
Vol 779-780 ◽  
pp. 731-738 ◽  
Author(s):  
Ke Xin Zhang ◽  
Jian Wei Yao ◽  
Ze Ping Zhao
Keyword(s):  
Neural Network ◽  
Test Data ◽  
High Speed ◽  
Ground Vibration ◽  
Vertical Vibration ◽  
Orthogonal Test ◽  
Vibration Level ◽  
High Speed Train ◽  
High Speed Railway ◽  
Vibration Attenuation

The principal aim of this paper is to determine the reasonable design parameters of high-speed railway vibration attenuation. The orthogonal test method is used to design the test of ground vibration induced by high-speed train. Four main factors that impact the maximum ground vertical vibration level are selected, and different values are given to each factor, so 8 groups of combinations can be obtained by using orthogonal test technique. Each group test data of the maximum ground vertical vibration level can be obtained by conducting vehicle testing on-track. In this paper, the primary and secondary factors that impact the maximum ground vertical vibration level are determined by range analysis. Moreover, the neural network theory is used to establish a model of the ground vertical vibration level, and this model can be trained and verified by the test data. The impact factors can be predicted by the method of combining orthogonal test and neural network concerning the specified vibration limit, and the value of maximum ground vertical vibration level with the predicted factors meets the requirement of accuracy. The conclusions provide a valuable reference to the vibration attenuation design of the high-speed railway.

Determination of the Vertical Vibration of a Ballasted Railway Track to Be Used in the Experimental Detection of Wheel Flats in Metropolitan Railways

2018 ◽  
Vol 141 (2) ◽  
Author(s):  
Ricard Sanchís ◽  
Salvador Cardona ◽  
Jordi Martínez
Keyword(s):  
Impulse Response ◽  
Vertical Vibration ◽  
Railway Track ◽  
Vibration Velocity ◽  
Kernel Convolution ◽  
Wheel Rolling ◽  
Vibration Attenuation ◽  
Wheel Profile ◽  
Convolution Method

This paper presents a mathematical model used to obtain the vertical vibration of a ballasted railway track when a wheel is passing at a certain speed over a fixed location of the rail. The aim of this simulation is to compare calculated root-mean-square (RMS) values of the vertical vibration velocity with measured RMS values. This comparison is the basis for a proposed time domain methodology for detecting potential wheel flats or any other singular defect on the wheel rolling bands of metropolitan trains. In order to reach this goal, a wheel–rail contact model is proposed; this model is described by the track vertical impulse response and the vertical impulse response of the wheel with the primary suspension, both linked through a Hertz nonlinear stiffness. To solve the model for obtaining the wheel–rail contact force, a double convolution method is applied. Several kinds of wheel flats are analyzed, from theoretical round edged wheel flats to different real wheel profile irregularities. Afterward, the vertical vibration velocity at a fixed point on the rail is obtained using a variable kernel convolution method. Running different simulations for different wheel flats, a study of the vertical vibration attenuation along the rail is carried out. Finally, it is proceeded to obtain the temporary evolution of the RMS value for the rail vertical vibration velocity in order to be used as a reference for detecting wheel flats or any other defect. This last aspect will be presented in more detail in a second paper.

Research on Active Control of Driver’s Seat Suspension System

2011 ◽  
Vol 105-107 ◽  
pp. 701-704
Author(s):  
Gong Yu Pan ◽  
Xue Ling Hao
Keyword(s):  
Active Control ◽  
Vertical Vibration ◽  
Suspension System ◽  
Matlab Simulation ◽  
Air Spring ◽  
The Road ◽  
Seat Suspension ◽  
Spring Suspension ◽  
Road Excitation ◽  
On The Road

In order to improve the driver confortness, the 5-DOF analysis mathematical car model with the active seat air-spring suspension system was built. Based on the linear stochastic optimal control theory (LQG), the signal of road’s input as excitation source was used to design the optimal law of this seat active control system. MATLAB simulation programming language was applicated for the response simulation. The results show that the control strategy on the road excitation system has a good applicability on controlling the vibration of the driver’s seat and active seat suspension can more effectively reduce the driver’s vertical vibration acceleration than passive seat suspension.

Evaluation of Human Exposure to Vibration Subjected to Active Suspension Actuators

2017 ◽  
Vol 9 (2) ◽  
Author(s):  
R. Rajalakshmi ◽  
S. Rajesh Kumar ◽  
J. Thiyagarajan ◽  
A. Vinothkumar
Keyword(s):  
Human Exposure ◽  
Degrees Of Freedom ◽  
Active Suspension ◽  
Vertical Vibration ◽  
Lumped Mass ◽  
Air Spring ◽  
Mass Model ◽  
Simulink Model ◽  
Lumped Mass Model ◽  
Unsprung Mass

This paper details the assessment of human response to vibration through modelling of seated human body using seven degrees of freedom lumped mass model. Continued human exposure to chronic vibrations may subsequently leads to person’s discomfort. To avoid this discomfort, an active suspension with combination of electro-hydraulic, pneumatic or air spring actuator is introduced between sprung mass and the unsprung mass which is controlled by a PID controller. For the simulation, ISO D-class road is given as input for the designed Matlab Simulink model and the results were compared. The simulation result shows that air spring actuators based active suspension can effectively attenuate the vertical vibration acceleration and increase the riding comfort.

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