Development and Application of Simulation for Low-Frequency Boom Noise and Ride Comfort

1990 ◽  
Author(s):  
Kunihiro Hoshi ◽  
Kazuhiko Gotou
Keyword(s):  
Ride Comfort ◽  
Low Frequency

scholarly journals Dynamic performance analysis and parameters perturbation study of inerter–spring–damper suspension for heavy vehicle

2020 ◽  
pp. 146134842096289
Author(s):  
Xiaofeng Yang ◽  
Long Yan ◽  
Yujie Shen ◽  
Hongchang Li ◽  
Yanling Liu
Keyword(s):  
Ride Comfort ◽  
Dynamic Performance ◽  
Low Frequency ◽  
Angular Acceleration ◽  
Vertical Vibration ◽  
Heavy Vehicle ◽  
The Road ◽  
Multi Objective Genetic Algorithm ◽  
Parameters Perturbation ◽  
Dynamic Performance Analysis

Inerter, a new type of mass element, can increase the inertia of motion between two endpoints. In order to study the dynamic inertia effect of inerter–spring–damper suspension for heavy vehicle on ride comfort and road friendliness, the inerter–spring–damper suspension is applied and its mechanism is studied. This paper establishes a half vehicle model of inerter–spring–damper suspension for heavy vehicle. The parameters of inerter–spring–damper suspension for heavy vehicle are optimized by multi-objective genetic algorithm and system simulations are carried out. The parametric influence of different spring stiffness, damping coefficient, inertance, and load on suspension performance is also studied. The simulation results demonstrate that the centroid acceleration and pitch angular acceleration are improved by 24.90% and 23.54%, respectively, and the comprehensive road damage coefficient is reduced by 4.05%. The results illustrate that the inerter–spring–damper suspension can decrease the vertical vibration of vehicle suspension especially in low frequency and reduce the road damage. The analyses of suspension parameters perturbation reveal their different effect laws of the different wheels on vehicle ride comfort and road friendliness, which provide a theoretical basis for setting parameters of inerter–spring–damper suspension.

Enhanced ride comfort using nonlinear seat suspension with high-static-low-dynamic stiffness

2020 ◽  
Vol 51 (4-5) ◽  
pp. 63-76 ◽  
Author(s):  
Chun Cheng ◽  
Yan Hu ◽  
Ran Ma
Keyword(s):  
Ride Comfort ◽  
Structural Parameters ◽  
Dynamic Stiffness ◽  
Damping Ratio ◽  
Low Frequency ◽  
Coupled Model ◽  
Human Model ◽  
Vehicle Speed ◽  
Seat Suspension ◽  
Low Frequency Vibration

To attenuate the low-frequency vibration transmitted to the driver, a nonlinear seat suspension with high-static-low-dynamic stiffness is designed. First, the force and stiffness characteristics are derived. The nonlinear suspension can achieve the quasi-zero stiffness at the static equilibrium position when the structural parameters are properly designed. Then, a car-seat-human coupled model which consists of a quarter car model, a seat suspension, and a 4 degree-of-freedom human model is established to predict the biodynamic response of the driver. Finally, the isolation performance of the high-static-low-dynamic stiffness seat suspension under two typical road excitations is evaluated separately based on the numerical method. The effects of stiffness ratio, damping ratio, and vehicle speed on the ride comfort are investigated. The results showed that the nonlinear seat suspension outperforms the equivalent linear counterpart and can achieve the best ride comfort when the quasi-zero stiffness condition is satisfied.

scholarly journals Research on Low-Frequency Swaying Mechanism of Metro Vehicles Based on Wheel-Rail Relationship

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Yixuan Shi ◽  
Huanyun Dai ◽  
Qunsheng Wang ◽  
Lai Wei ◽  
Huailong Shi
Keyword(s):  
Ride Comfort ◽  
Low Frequency ◽  
Railway Vehicle ◽  
Initial Contact ◽  
Lateral Direction ◽  
Vehicle System ◽  
Locus Method ◽  
Multibody Dynamic ◽  
Hunting Frequency ◽  
Equivalent Conicity

For the worn state of the wheel, metro vehicles often suffer a serious carbody swaying issue, which causes the lateral stability of the vehicle to exceed the limit and affects the ride comfort. An experimental test was carried out on this investigation to study the carbody swaying of the metro vehicle. The field results show that the vehicle system vibrates at around 2.5 Hz in the lateral direction, which leads to the low-frequency swaying on the carbody. In order to explore the formation mechanism of the carbody low-frequency swaying and its relationship with the geometry matching of wheel-rail contact, measured rail and wheel profiles are employed to present a comparative analysis with respect to the initial contact geometry. A multibody dynamic railway vehicle system is established further. Time-domain simulations state that the 2.5 Hz vibration on the carbody belongs to the natural frequency of the vehicle, and the amplitude is larger for the measured wheels than that of the standard wheel profiles. By using the root-locus method, it can be determined that the 2.5 Hz vibration corresponds to the upper swaying mode of the carbody. With the increase in the wheel-rail equivalent conicity, the hunting frequency of bogie increases gradually, which converts frequency with the upper swaying frequency of carbody and leads to carbody low-frequency swaying.

scholarly journals Research on Ride Comfort and Driving Safety under Hybrid Damping Extension Control for Suspension Systems

2020 ◽  
Vol 10 (4) ◽  
pp. 1442
Author(s):  
Guoqing Geng ◽  
Yi Yu ◽  
Liqin Sun ◽  
Hao Li
Keyword(s):  
Control System ◽  
Ride Comfort ◽  
Model Simulation ◽  
Low Frequency ◽  
Active Suspension ◽  
Extension Theory ◽  
Driving Safety ◽  
Suspension Systems ◽  
Frequency Excitation ◽  
Hybrid Damping

This paper is concerned with the conflicting performances of ride comfort and driving safety for semi-active suspension systems. To alleviate this conflict, a novel hybrid damping extension control (HDEC) method is proposed. This method adopts various control methods and the weights of each method are determined by extension theory. Firstly, body acceleration and tire dynamic transformation are selected to evaluate ride comfort and driving safety performance for the semi-active suspension system and their frequency responses of passive suspension, sky-hook control, ground hook control, and S-GH (sky-ground hook) control are analyzed based on a two degree-of-freedom (2-DOF) model. Secondly, extension theory is introduced and the extension control system, which contains three modes and corresponding control algorithms, is established. In addition, the low-frequency excitation and high-frequency excitation simulations are designed to determine the parameters of the extension control system. Finally, ve-DYNA vehicle suspension model simulation is applied to prove the feasibility and effectiveness of the extension control. The simulation results show that, based on the suspension state, extension control can improve the performance of ride comfort and driving safety.

Analysis of Vehicle Interior Low-Frequency Noise Based on ATV

2014 ◽  
Vol 494-495 ◽  
pp. 78-81
Author(s):  
Long Ma ◽  
Wen Feng Xia
Keyword(s):  
Acoustic Pressure ◽  
Ride Comfort ◽  
Low Frequency ◽  
Coupled System ◽  
The Body ◽  
Frequency Noise ◽  
Vehicle Interior ◽  
Fem Model ◽  
Acoustic Structure ◽  
Acoustic Cavity

The FEM model of the body and acoustic cavity are created, and the acoustic-structure coupled system is built up,and the SPL(sound press level) of points corresponding to the drivers ear and passengers ears were calculated using software LMS.virtual.lab. And there are several relatively noticeable acoustic pressure peaks around 60Hz, 102Hz, 120Hz and 168Hz. The maximum noise value was calculated by using the method of ATV method, several suggestions are advised to decrease the vehicle interior noise so that the vehicle ride comfort could be improved.

Experimental Research on a Certain Light Truck Cab Suspension System Effect on Ride Comfort

2011 ◽  
Vol 128-129 ◽  
pp. 1460-1463 ◽  
Author(s):  
Chao Dai ◽  
Ji Hui Liang
Keyword(s):  
Ride Comfort ◽  
Low Frequency ◽  
Suspension System ◽  
Shock Attenuation ◽  
System Effect ◽  
Light Truck ◽  
Idle Speed ◽  
Attenuation Rate ◽  
Cab Suspension ◽  
Absorption Performance

Ride comfort is one of the main using performance items and competitiveness index of the automobile. This paper carries out shock absorption performance experiment for a certain light truck cab suspension system to study the shock attenuation rate of the four suspension points of the cab when it is under no-load and full-load status running with speed of respectively 40，50，60，70，80 km /h, as well as under the idle speed status. The result shows that the shock attenuation rates of the front cab suspension points under various conditions are low. And the shock attenuation rate of the back cab suspension points at Z direction is low. Front and back cab suspension points have no attenuation to low frequency shock. It is suggested that the cab suspension rigidity needs to be re-matched.

Vibration Analysis and Optimal Design for Cab’s Isolation System of Vibratory Roller

2011 ◽  
Vol 199-200 ◽  
pp. 936-940 ◽  
Author(s):  
Le Van Quynh ◽  
Jian Run Zhang ◽  
Guo Wang Jiao ◽  
Xiao Bo Liu ◽  
Yuan Wang
Keyword(s):  
Optimal Design ◽  
Optimization Model ◽  
Vibration Analysis ◽  
Ride Comfort ◽  
Dynamic Test ◽  
Low Frequency ◽  
Frequency Range ◽  
Working Capacity ◽  
Forward Motion ◽  
Isolation System

In recent years, vibration roller market has required increasingly not only on working capacity but also ride comfort. Thus, in order to reduce the effect of vibration to operators, identification and elimination of vibration sources are the most important tasks to achieve optimum design. In this paper, the attention is paid to cab’s low-frequency sloshing analysis and optimal design for cab’s isolation system of vibratory roller. When working, it often exists the problem of cab’s low-frequency sloshing in the direction of forward motion. In order to solve this problem, the dynamic test and simulations analysis are carried out; and the main reasons causing cab’s low-frequency sloshing are found out. The optimization model according to the two points response amplitude in the direction of forward motion on the cab to reach the minimum value in the low frequency range is proposed in this paper. And also, the auxiliary vibrations isolator for solving the low-frequency sloshing in the direction of forward motion is designed.

scholarly journals Ride comfort performance of hydro pneumatic isolation for soil compactors cab in low frequency region

2020 ◽  
Vol 22 (5) ◽  
pp. 1174-1186 ◽  
Author(s):  
Vanliem Nguyen ◽  
Renqiang Jiao ◽  
Vanquynh Le
Keyword(s):  
Ride Comfort ◽  
Low Frequency ◽  
Frequency Region

scholarly journals Vibration Analysis and Modeling of an Off-Road Vibratory Roller Equipped with Three Different Cab’s Isolation Mounts

2018 ◽  
Vol 2018 ◽  
pp. 1-17 ◽  
Author(s):  
Vanliem Nguyen ◽  
Jianrun Zhang ◽  
Vanquynh Le ◽  
Renqiang Jiao
Keyword(s):  
Dynamic Model ◽  
Ride Comfort ◽  
Three Dimensional ◽  
Low Frequency ◽  
Operating Conditions ◽  
Experimental Investigations ◽  
Nonlinear Dynamic Model ◽  
Obvious Effect ◽  
Low Frequency Vibration ◽  
Power Spectral

This study proposes a dynamic model of the vibratory roller interacting with the off-road deformed terrain to analyze the low-frequency performance of three different cab’s isolation mounts under the different operating conditions. In order to evaluate the ride comfort of the vibratory roller with the different cab’s isolation mounts, a three-dimensional nonlinear dynamic model is established. The power spectral density (PSD) and the weighted root mean square (RMS) of acceleration responses of the vertical driver’s seat, cab’s pitch, and roll vibrations are chosen as objective functions in the low-frequency range. Contrastive analysis of low-frequency vibration characteristics of the vibratory roller with the traditional rubber mounts, the hydraulic mounts, and the pneumatic mounts is carried out. Experimental investigations are also used to verify the accuracy of models. The research results show that the hydraulic mounts have an obvious effect on mitigating the cab vibration and improving the ride comfort in comparison with the traditional rubber mounts and the pneumatic mounts.

Dynamic Analysis of Linke Hofmann Busch Coach and Determination of its Sensitive Design Parameters Considering Suspended Equipments

2018 ◽  
Vol 10 (4) ◽  
Author(s):  
S.D. Singh ◽  
Rakesh Mathur ◽  
R.K. Srivastava
Keyword(s):  
Ride Comfort ◽  
Low Frequency ◽  
Comfort Level ◽  
Design Parameters ◽  
Bogie Frame ◽  
Long Wavelength ◽  
Stiffness And Damping ◽  
Sensitive Parameters ◽  
Track Irregularities

This study aims at dynamic behaviour of a Linke Hofmann Busch coach and its sensitive parameters against track irregularities considering various suspended equipment. The randomly distributed track irregularities characterized in terms of Indian Rail Road PSD standard are considered main source of excitation that produces undesired vibrations. The coach body and bogie frame subjected to 4 degree of freedom motions (bounce, lateral, roll and pitch) are modelled using finite element methodology where system matrices such as mass, stiffness and damping matrices are obtained for eigenvalue solution. Using modal parameters obtained as above and PSD of track irregularities, both vertical and lateral mean square acceleration responses (MSAR) are determined at various points of concern on coach body. It is observed that the vertical peak responses occur in low frequency range (0-10 Hz) which is caused by long wavelength irregularities of track that causes discomfort. It is also observed that constant peak lateral responses occur at still lower frequency as compared to vertical response which again causes discomfort to vehicle riders. This concludes that there is a further scope of improvement in comfort level with minor adjustments of suspended equipment of a LHB coach. A sensitivity analysis based on the partial derivatives against FRF displacement is conducted and most sensitive design parameters are obtained for optimization to improve ride comfort. It is suggested that if the mass of bio toilet tanks and relative position of battery box + transformer unit i.e. most sensitive parameters of suspended equipment are changed then the ride comfort can be improved

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