拖拉机轮胎压力多态控制系统浅析

【目的】实现不同工况和作业环境下对拖拉机轮胎压力的合理调节,解决目前拖拉机作业过程中胎压无法调节的问题,减缓轮胎磨损,延长轮胎使用寿命。【方法】研究团队通过对不同工况下拖拉机理想胎压状态的统计分析,设计了一种能够满足不同胎压的充放气系统。其中,重点分析了拖拉机轮胎压力多态控制系统的工作原理和实现方式,并完成了装车验证。【结果】该系统有运输模式、中耕模式、旋耕模式、犁耙模式共4种胎压模式,可以满足用户对拖拉机轮胎压力进行合理调节的需求。该系统操作简单方便,驾驶员在驾驶室内通过多态开关便可选择不同作业形态对应的轮胎压力标准值,在控制器的控制下自动调节胎压以适应当前的作业形态。不同作业环境下选择相应合理的轮胎压力可提高牵引功率6%~8%,充分发挥拖拉机功率,从而发挥拖拉机最大牵引力,并可提高作业效率、降低油耗。

MULTIMODAL CONTROL OF SEISMIC RESPONSES OF TALL BUILDINGS

Multimodal control for seismic responses of tall buildings is performed by using MTMDs. Installation and main parameters of MTMDs are described, equations of motion of the coupled system of tall buildings and MTMDs are built under earthquake excitations, and parametrical optimization for multimodal control is carried out under excitations of harmonic ground motion. An 11 story frame building controlled by MTMDs is simulated under the excitation of El Centro earthquake (1940, NS), and its displacement response at the top floor in the case of multimodal control is reduced by 20% more than the case of single modal control. Some conclusions are given as the MTMDs is an effective, reliable and practical passive measurement for controlling seismic responses of tall buildings and the multimodal control has better adaptability and reliability by comparison with the single modal control.