No abstract

In order to achieve the target of control vehicle height in running state,we designed a control schematic of which practicability was analyzed. By using AMEsim software, we established the mathematical model of the charging and releasing oil to simulate the performance of a 1/4 vehicle with hydro-pneumatic suspension. From the result, we get the conclusion that charging and releasing oil in running state has tiny effect on ride comfort, and stability of the vehicles.

The heavy-duty special vehicles easily roll during steering, anti-rolling technology becomes a critical technology to the heavy-duty vehicles. Aiming at the rolling problem of a full load heavy vehicle in the process of steering, an interconnected anti-rolling suspension system with adjustable damping was designed, the nonlinear mathematical models of both hydro-pneumatic independent suspension and interconnected anti-rolling suspension system were established. The mechanical characteristics of two kind of suspension were studied through digital simulation method, discussing the system parameter changes affection on the performance of interconnected anti-rolling suspension system. The study results indicate that the interconnected anti-rolling suspension system bitterly improves vehicles rolling resistance in contrast to the oil-gas mixed independent suspension, the study results provide theoretical basis for the anti-rolling s design of heavy-duty vehicles.

We present a real-time feedback control strategy to optimize the dynamic performance of a computer communication network. In previous studies closely related to this topic, feedback delay, arising from communication delay, was shown to degrade system performance. Considering this negative impact of delay, we propose a new control law which predicts the traffic in advance and exercises control based on the predicted traffic. We demonstrate through simulation experiments that the predictive feedback control law substantially improves the system performance.

Dual-arm robot shows an advantage in tasks where coordinate action ability is needed, but algorithm for motion planning is generally complex. To simplify the kinematic analysis of dualarm industrial robot, a geometric project method was present in this paper. Taking the pole-in-hole insert assembly as example, mathematical model of loose and tight coordination movement of planar dual-arm was built and simulated to illustrate the theory and computational method. From the point of application, coordinated operation kinematic analysis of spatial dual-arm was investigated by utilizing geometric project method. Research shows that the geometric projection method can be complementary with traditional algebraic method. On the other hand, it can simplify the solution process of coordinated motion planning under specific conditions, and it is an innovative approach to solve the coordinated motion of dual-arm robot.