The results show that, compared with SS7E locomotive, SS7E modularized locomotive features higher running stability, similar safety performance in curve negotiation as well as similar riding quality in straight line.
The effect of turbulent disturbance on the behavior of decoupling control in case of an aircraft penetrating at low level by using TF/TA technologies and control and its riding quality of the pilot are studied by pilot-vehicle semi-physical simulation technique. At the same time, the tracking behavior of nonlinear decoupling system on the real-time control command of the pilot is verified,too.
According to relevant pavement maintenance criterions, this paper proposes the riding quality index (RQI), pavement condition index (PCI), pavement structural sufficiency index (PSSI); and pavement quality index (PQI), which constitute the integral pavement evaluation system for urban roads.
Based on the basic requirements for pavement evaluation and the analysis of the existing problems such as inaccuracy in the evaluation results and inefficiency in the data collections,refined evaluation indexes are presented including pavement condition index and riding quality index.
The results show that predicted data of pavement condition index,riding quality index,structure strength index and British pendulum number is much better precision.
Present asphalt freeway pavement evaluation model is developed based on the normal asphalt pavement evaluation model which includes four individual indexes: riding quality index (RQI), surface resistance index (SRI), pavement condition index (PCI), pavement structural sufficiency index (PSSI); and an integration index pavement quality index (PQI).
The control algorithm is applied to the active suspension by means of the control simulation softwareMatlab6.1+Simulink for Windows2000.The results of simulations show that the control algorithm used can reduce the root mean square value of car body acceleration and the root mean square value of suspension dynamics deflection,so the riding quality can be greatly improved.
With the exclusion of transverse expansion or contraction joints of Portland Concrete Pavement, CRCP has more advantages including better riding quality, higher bearing capacity, longer service life and less maintenance work.
Considering that the track structure bears the right force, the train riding quality is not influenced, and there is mild change of track irregularities, the paper proposes the evaluation index of getting the right stiffness level of track and parts thereof and the analysis method.
In this article, the wheel tractor is treated as a vibration system with two degrees of freedom. Using the solution of the differential equations of such a system, the characteristics of the free vibrations of tractor is analysed. The two partial frequencies ("constrained frequencies" )are suggested to be the fundamental critenia for wheel tractor riding quality. Some testing result of partial frequency are given, and a method of calculating forced vibrations in two typical cases is introduced, ...
This paper gives the analysis of the vertical dynamics of a railwayvehicle with two-stage suspension,and a digital computer method is presen-ted.This method may be used to analyse the influence of the suspensionstiffness and damping on the vibration of a vehicle.Therefore,the suspen-sion parameters will be properly selected in order to achieve satisfactoryvertical riding quality throughout the operating speed range.
The statistical analysis on the measured data of automotive riding quality is practised by applying the theory of stationary radom vibration, and the riding quality evaluation is done by using international standard ISO2631-1978 (E) "Guide for the evaluation of human exposure to whole-body vibration". And the scientific basis has been provided here for the improvement of the automotive riding quality.
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