The Design And Experimental Research Of The Servo Loading System Of Pump Controlling Based On Dynamic Compensation Principle

Electric hydraulic servo loading system is applied in various industrial fields, such as aerospace, construction, materials, railway, mechanical testing, almost all the cases of structure analysis and fatigue analysis can use the electro-hydraulic servo loading system. But, at present, the electro-hydraulic servo loading system based on servo valve controlled can not be used in harsh and complex working conditions,because it is sensitive to the oil contamination and it has a poor anti-interference ability, and its cost is higher, those all hamper the development of the electro-hydraulic servo loading system.Therefore, in this paper, a systematic theoretical based on dynamic compensation principle of the pump controlled servo loading system is analyzed, this system adopts double servo pump coupling control input flow. Experimental analysis is carried out by building prototype.The relationship of the various systematic parameters between the theoretical and the practical results through the experiment is obtain, the performance of the system is got, and the loading precision is studied by the experimental. The digital PID control algorithm is used to improve the loading accuracy through the combination with the theoretical knowledge.First of all, the basic principle of the loading system is that there are some function relations between pressure and leakage, and it is analyzed through the hydraulic principle and the ascertainment of the system parameters. And for the new pump controlled servo loading system,its final goal is to output the exact and stabilized force value of end force source(hydraulic cylinder),by adjusting the input flow to the hydraulic system and using this flow to compensate the leakage of system. In this process, pressure loss and flow loss can be fully compensated should be considered,and this is the premise of the normal work of the system.Secondly, the components of system will be purchased and the prototype will be builded after the determination of the hydraulic principle and basic parameters. The prototype consists of two parts: hardware and software. After the hardware is selected and the prototype is assembled, the whole system will be debugged, and then do a good job of software interface and programming.Then, the parameters and the performance of the system will be optimized and adjusted, by using analysis and simulation results of the transfer function under ideal conditions. During the actual experiment, the parameters should be also adjusted to get a very good loading performance, under the guide of the results of the analysis and simulation.Finally, the specific and the arbitrary loading force value loading experiment will be conducted, and get the loading precision and loading performance of the pump controlled servo loading system based on dynamic compensation principle in the interval 0~10t, and analysis the influence of loading fluctuations in the value of the loading precision.