Design, Analysis And Development Of Longitudinal Active Buffer System And Its Controller For Ambulance Operation Platform

In recent years, with the frequent earthquake, tsunami, typhoon and other naturaldisasters of the World and the global regional war, a large number of wild patients inneed of urgent transfer and treatment, which has greatly promoted the development ofSpecial ambulance. As professional medical equipment which can provide surgery forthe patient in the process of driving environment, operation-ambulance becomes animportant research topic.This paper has researched deeply on the key problems of vibration and shock,which affect operation on the way, caused by sudden deceleration. And the active buffercontroller is researched and developed. This plays an important role for improving theability of emergency delivery, the comfort level of patients and the operational safety ofthe medical staff on the buffer platform. Buffer system adopts the method of nonlinearactive control. Compared with the traditional passive vibration isolation system, it cantake an action to control the vibration of the system according to the state of the systemand the current braking condition of the ambulance. And the biggest advantage of thissystem is that it has a high degree of adaptability. The main study contents of this paperare as follows:First of all, on the basis of consulting a large number of research literatures aboutSpecial ambulance, buffer operation platform, air spring damping characteristics andbrake buffer control method, this paper systematically analyzed the overseas anddomestic research status of the ambulance buffer device.At the same time, through the analysis of the internal space layout of theoperation-ambulance, we design the structure of the buffer system arrangement schemein this paper. Then, by using the finite element analysis software, ANSYS Workbench,the main stress parts in the system were analyzed about their strength of materials. Andthe results verified the reliability of the system structure.After that, on the basis of making in-depth analysis on typical braking process andthe features of the buffer system components, the buffer system simulation model wasestablished and run based on the software, Matlab/Simulink. Compared with the resultsof air spring passive vibration simulation, it verified the feasibility of active controlsystem. This method shortened the cycle of active buffer system design and reduced thedevelopment cost and risk. Finally, the active buffer controller hardware system was designed. The workinclude the power conversion circuit, the sensor signal acquisition circuit,electromagnetic valve drive circuit, prompt signal circuit and reset circuit. Consideringthe controller shape, design of anti-electromagnetic interference, controller heatdissipation and installation location of sensor interfaces, the controller PCB wasreasonably decorated.