Based on the analysis of a typical elevator for car hydraulic system, a general modular simulation model is established. Through the case study of initial cavity volume and load change different effects on the dynamic performance of hydraulic system, the conclusion is found that the increase in initial cavity volume and load are conducive to reducing the hydraulic impact at the starting moment, but have an adverse effect on the dynamic performance at the stopping moment, and that the time to reach the steady state increases.

Mechanical parking systems are widely used special electromechanical equipments. With the increasing interests on strength safety, it was becoming a hot spot to achieve its strength properties precisely. Based on Timoshenko beam theory, a mechanical parking system was simplified to a two dimensional model, and strength calculation was performed with analytical method. Furthermore, finite element method was adopted to calculate the strength properties of this mechanical parking system, and the maximum Von Mises and shear stress were approached. By comparison with experimental stress analysis, the finite element analysis was precise, which showed a potential application in practical engineering.

In order to supply a reliable and low-cost method for construction machinery real-time test, take a hydraulic excavator for example. Especially for testing controllers and evaluating the performance of strategies, a hardware-in-the loop platform has been developed based on the xPC real-time system. The hardware-in-the-loop system, including dynamic model of the excavator and an 3D real-time display subsystem, is presented in this paper. The simulation results are also described at the end of the paper.