Experimental Study on the Ride Comfort of a Crawler Power Chassis Scale Model Based on the Similitude Theory

The ride comfort experimental assessment of crawler off-road vehicle is relatively overlooked, and is expensive and difficult to execute with higher and higher ride comfort performance requirements. To trade off between precise and cost, an experimental method based on the similitude theory is propo...

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Bibliographic Details
Published in:Chinese journal of mechanical engineering 2015-05, Vol.28 (3), p.496-503
Main Authors: Zhao, Jianzhu, Wang, Fengchen, Yu, Bin, Tong, Pengcheng, Chen, Kuifu
Format: Article
Language:English
Subjects:
Acceleration
Automotive parts
Chassis
Electrical Machines and Networks
Electronics and Microelectronics
Engineering
Engineering Thermodynamics
Feasibility studies
Heat and Mass Transfer
Instrumentation
Machines
Manufacturing
Mechanical Engineering
Off road vehicles
Passenger comfort
Performance indices
Power Electronics
Processes
Resonant frequencies
Scale models
Similarity
Stiffness
Suspension systems
Theoretical and Applied Mechanics
乘坐舒适性
低阶固有频率
履带式车辆
平顺性试验
机箱
比例模型
电源
相似理论
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Summary:The ride comfort experimental assessment of crawler off-road vehicle is relatively overlooked, and is expensive and difficult to execute with higher and higher ride comfort performance requirements. To trade off between precise and cost, an experimental method based on the similitude theory is proposed. Under the guidance of the similitude theory, a 1：5 crawler power chassis scale model equipped with a kind of variable stiffness suspension system is used. The power spectrum density（PSD）, the root mean square（RMS） of weighed acceleration, peak factor, average absorbed power（AAP） and vibration dose value（VDV） are selected as ride comfort evaluation indexes, and tests results are transformed via similarity indexes to predict the performance of full-scale power chassis. PSD shows that the low-order natural frequency of the vertical natural frequency（z axis） is 1.1 Hz, and the RMS, AAP and VDV values indicate the ride comfort performance of this kind of power chassis is between the ＂A little uncomfortable＂ and ＂Rather uncomfortable＂. From the results, low-order vertical natural frequency, obtained by PSD, validates that the similarity relationship between two models is satisfied, and 1：5 scale model used in experiment meets the similarity relationship with the full-scale model; consequently, the ride comfort prophase evaluation with the 1：5 scale model is feasible. The attempt of applying the similitude theory to crawler vehicle ride comfort test study decreases the cost and improves the test feasibility with sufficient test precise.
ISSN:1000-9345
2192-8258
DOI:10.3901/CJME.2015.0306.024