【摘要】 设计了基于电液比例控制的轮式桥面结构疲劳试验机(以下简称试验机)液压加载系统。为了确保试验机液压加载系统可以线性控制试验桥面的加载力,设计了加载机构,使得加载机构在最大轮胎变形时对加载力造成的影响小于0.2%。同时,建立了试验机加载系统的仿真模型,对系统的动静态加载进行仿真分析,并通过试验验证。结果表明,设计的试验机加载系统满足控制电压与加载力之间的线性关系,并实现最大15 000 kg的恒压加载工况和2.0 Hz以内振幅1 500 kg的正弦加载工况,能够较好满足当前桥梁疲劳试验的加载要求。更多还原

【Abstract】 A loading system based on electro-hydraulic proportional control is designed. To meet the requirement that the hydraulic loading system of the test machine can linearly control the loading force of the test bridge deck,a loading mechanism is designed,which makes the error on loading force less than 0.2% when the maximum tire deformation occurs. Meanwhile,a simulation model of the loading system is established to simulate and further analyze the dynamic and static characteristics. Finally,the static and dynamic characteristics of the loading system are verified by the static loading experiment and the sinusoidal loading experiment with the same amplitude at different frequencies, respectively. The experimental results show that the loading system can achieve linear loading between the control voltage and the loading force,and satisfy the constant loading within 15 000 kg and under the sinusoidal loading condition when the amplitude is less than 1 500 kg and the frequency is within 2.0 Hz.更多还原