Pan Cunzhi

Nonlinear Dynamics of a Spur Gear Pair with Time-Varying Stiffness and Backlash:

In this paper the nonlinear dynamics of a spur gear pair are researched based on the Incremental Harmonic Balance Method (IHBM), where the time-varying stiffness and backlash are included. Firstly, the general forms of the periodic solutions are established. Then the frequency-response of this system is investigated by IHBM, and the effects of damping ratio and amplitude of excitation on the response are also analyzed. Based on the results presented in this paper the periodic solution with arbitrary precision can be expeditiously obtained, which is useful in analyzing or controlling the dynamics of the gear system. Finally some problems ignored in other references are pointed out.

Road Safety Evaluation from Traffic Information Based on ANFIS

With the rapid growth of the number of various vehicles, the ratio of the traffic accidents to vehicle number is increasing greatly. To improve road safety, it is necessary to monitor and evaluate the traffic safety degree first of all. The factors that influence the road traffic safety include the basic traffic parameters such as velocity and density, the peccancy behaviors such as overspeed, overweight and retrogradation and the weather conditions such as the plane visibility on the road. In this paper, an index, level of safety (LOS), is defined to indicate the road safety extent of traffic state. It is a continuous number and should much fit human perception on safety. In this paper, a new method is present to evaluate LOS on freeway based on ANFIS (adaptive-network-based fuzzy interference system). ANFIS applied in this paper is based on zero-order Sugeno fuzzy model embedded into a framework of adaptive networks. In the evaluating system the inputs are mean velocity, mean density and the plane visibility on the road detected, and the output is LOS. After a simulation with MATLAB, the traffic safety evaluation system based on ANFIS is put up and a series of fuzzy logic rules are trained. As a result, the evaluating system based on ANFIS has the adaptive capacity and will be helpful to enhance the safety level on the road.

Experimental research of magneto-rheological fluid clutch

The character of magneto-rheological fluid is introduced, the working principle and basic structure of MR clutch are analyzed and the moment calculating model is established. The basic parameter requirement for designing MR clutch is presented and the example of MR clutch is given.

An incremental predictive functional control based on Kautz model

An incremental model was built using the orthogonal Kautz function base. An adaptive predictive functional control algorithm based on incremental Kautz model has been designed in this paper. An increment state space equation is used to model the course. The recursive least-squares (RLS) is used to identify the parameters online. The simulations verified the given strategy. It is shown that the value of over output is restrained, and the control quality is increased with the designed method.