The Research On The Modeling & Simulation And The Test Rig For Vehicle With VLSD

The paper makes research on the VLSD and the design of it according to the task which belongs to the Committee of National Economy and Trade,which is cooperated by JLU and a factory.This paper makes mainly researches on the application for VLSD in vehicle .Main contents as follows:The paper educes calculation equations for shearing torque transmitted by viscous couple from the research method of two parallel infinite plate's shearing torque produced by the relative turning between them. Afterwards, the paper analyzes the factors that influence the characteristic of transferring torque of viscous couple and gets the calculation model for computing the shear torque of VLSD, with inclusion of all factors that have effect on the characteristic. This model describes that the difference of rotate speed of two axle of viscous couple and the working temperature of it is the main outside factors influencing the shear torque of VLSD.And so the paper simplifies the heat-transfered process and establishes the calculation equations to analyze the temperature of viscous couple making use of method of calorifics. Therefore, the instantaneous characteristic of viscous couple can be described as the function of the two inputing-speed and working time of viscous couple. Making use of this model, we can analyze the working property of VLSD with the assistance of computer simulation. In addition, this paper brings out a method that can be used to calculate the time and press that the viscous couple begins to come out torque amplification.With the design and exploitation of the product of VLSD, The paper summarizes the characteristic of each part of the product. And for the design of the friction part,the select of the viscous liquid and the pressurization ofviscous liquid,The paper makes the analysis of technique particularly.Utilizing the Tig test to determine the output characteristic of VLSD torque and analyzing the impacts of VLSD on output characteristic of limited-slip torque under the changes of various kinds of factors(silicon oil viscidity?stuffing rate?space between principal and subordinate discs? speed difference). Through the analysis of the test data and curves we can know, the lower working temperature of silicon oil is, the greater viscidity of filling silicon oil is, the smaller blade interval is, the greater difference of rotational speed of two output shafts are, and the bigger transmitting limited-slip torque is, of which the impact of viscidity and working temperature of silicon oil on the whole transmitting torque characteristic of differential is relatively obvious.By analyzing the vehicle in dynamics during its turning, this paper establishes a "three-wheel vehicle" model by linearization method for analyzing the controllability and stability of rear-driving vehicle with VLSD. This model may be used to analyze the effect of limited torque on vehicle's controllability and stability. And then the paper establishes a simulation model for computer based on the mathematic model explained upward. And so, the application issues, such as, the effect of limited torque of VLSD on the vehicle's stability, the matching degree between the limited torque and the vehicle's stability, can be analyzed by using of computer simulation.Making using of the model established ,we can analyze the effect of VLSD of the controllability and stability(steady static circular test , Pylon course slalom test)when the automobile swerved to the automobile .At the same time ,the paper establishes a simulation model for computer based on the mathematic model explained upward.After contrasting the result of themathematic model explained upward.After contrasting the result of the emluator of the VLSD automobile to the common automobile,it is proved that the model established and the result of emluator is right. At the same time , the drivability and the controllability and stability of the VLSD automobile advances obviously .The research developed in this paper will promote the study of VLSD in our country more penetrately, a...