用于滑转率控制的拖拉机机组瞬态阻力模拟器

Research and Design of a Simulator of Tractor-Combination Transient Resistance for Slip Control System

在室内土槽台车上，研制了用于滑转率控制实验的拖拉机机组瞬态阻力模拟器，利用磁粉制动器作为施力装置。它可以替代拖拉机机组中的犁和电液伺服系统，既能模拟机组静态阻力和阻力扰动，又能模拟犁调节过程中的阻力变化，加载迅速，调节中力的变化以相应的犁调节电液系统的简化数学模型为理论基础，适于对多种机型的模拟。这为研究滑转率控制系统的特征、寻求最佳控制算法提供了必要的实验手段。

To study transient performance of a wheel type tractor in the respect of slip controlsystem, a tractor resistance simulator is developed which is composed of a magnetic powder brakeused for exerting force on the model tractor. The simulator which replaces the plough and electro-hydraulic servo subsystem can be used for simulating the transient tractor-combination resistace which consists of static tractor-combination resistance, disturbing resistance and the changing resistance which will occur during plowing. Based on the simplified mathematical model ofelectro-hydraulic subsystem of a tractor-combination system, the changing resistance appearingin tillage operation is simulated. The simulator is suitable for different types of tractor throughchanging the controlling software and hardware. It provides a facility for easily finding out an optimum control algorithm of the slip control system.