Search

In the situation of high-speed or heavy load, pneumatic cylinders usually generate cushion failure like collision or rebound, so that the key question to be solved for the cylinders is cushion. In order to obtain a better cushion method, the paper used the ideal cushion characteristic curve of hydraulic cylinders for reference; and throttling area equation, temperature equation, flow rate equation and motion equation were established. By building the simulation module in Matlab/Simulink, the rule of throttling area approaching to the ideal cushion curve was found, which provide theoretical basis for the design of cylinders cushion devices.

A rigid-elastic coupling multi-body dynamic model of an in-wheel motor vehicle with double pivot suspension was established. The steering effort performance is analyzed. Results showed an excessive steering force of the vehicle with double pivot suspension. By optimizing the suspension parameters using response surface surrogate model and genetic algorithm, the characteristic of steering effort was improved.

A multi-body dynamic rigid-flexible coupling model of an in-wheel motor vehicle is built. This vehicle is based on a particular class-A car. An overall investigation of the influence of unsprung mass on vehicle ride comfort is conducted. With the increment of unsprung mass, overall vehicle ride comfort is decreased. The degradation of wheel dynamic load performance is most obvious. Suspension parameters are optimized based on the multi-body dynamic model of the vehicle and Response Surface Method. The suspension deflection and wheel dynamic load of the vehicle using optimized suspension parameters are improved significantly, while the body vertical acceleration increased slightly.

A double pivot suspension used for in-wheel motor electric vehicle was designed, and the virtual prototype model of the suspension assembly was build. The suspension parameters changed greatly during steering. In order to solve this problem, this paper proposed a non-linear response surface model to fit the relationship of suspension parameters and design variables. An optimization scheme was designed based on the response surface model. The suspension performance was improved significantly using optimized variables.

A rigid-elastic coupling multi-body dynamic model of a car was established. The controllability and stability including constant cornering, steering returnability and steering effort performances are analyzed. Results show that there is still a feasibility to enhance the understeer. By optimizing the suspension parameters using DOE method, the characteristic of understeer was improved. Simulation analysis indicated that the characteristics of steering effort and steering returnability were not affected due to change of suspension parameters.

Based on development of Chinese LDPE composites preparation engineering, this paper especially aims to analyze various modification methods on physical property improvements of LDPE/CaCO3 polymers. Most widely and advanced used methods of mixing technology research status and characteristics are reviewed and discussed. By studying inductive LDPE/CaCO3 composites effect, we are able to analyze composite conditions such as parameter value that are positive to reactions and briefly probe the challenges facing kinds of composite materials in the future.