SUN Da-gang, GAO Peng, SONG Yong, LIANG Pei-gen, SHEN Yi £¨ 1. School of Mechanical Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China; 2. Great Wall Motor Company Limited, Baoding 071000, China£©
Journal of Vibration and Shock
Abstract£ºBased on the analysis of the vibration isolation system of ambulance stretcher and the study on its dynamic model,a new buffer system of stretcher based on pneumatic artificial muscle was proposed.Then a vehicle-stretcher-human vibration model was built up,and a semi-active neural network PID controller for stretcher vibration control based on pneumatic artificial muscle was designed.The vibration isolation system performances were simulated by using the Simulation software,and the simulation results were analysed.The results show that compared with traditional system,the pneumatic artificial muscle buffer system using neural network PID control has more obvious isolation effect on stretcher and patient vibration,indicating the feasibility of using pneumatic artificial muscle in buffer system of ambulance stretcher.
Key words£ºambulance ; stretcher ; buffer ; pneumatic artificial muscle ; BP neural network control ;
Road irregularity excitation is an important factor in causing the vehicle vibration. Ambulances for transporting the sick and wounded, the ride is an important indicator. Foreign ambulance stretcher Buffering Isolation System earlier, such as Japan's initiative to control real-time control stretcher bed posture, optimal design of suspension systems electro-rheological fluid damper can effectively reduce the vibration response of the patient; Germany Binz developed stretcher hydraulic air damping system to obtain application. Shun heart and other ambulance stretcher to the damping device research. Through the establishment of the pneumatic artificial muscles (Pneumatic Artificial Muscle, PAM) stretcher isolation platform, isolated cabin vibration transmitted to the role of the stretcher, the stretcher after folding quickly locked in a rigid platform. Pneumatic artificial muscles stretcher isolation platform installation and automotive stretcher in the ambulance arrangement shown in Figure 1.
Pneumatic artificial muscles, also known as pneumatic rubber drive, perform the new stretch pneumatic components, consists of a strong plastic hose outsourced network configuration, charge, when deflation can be used like human muscle radial expansion and axial contraction and produce shaft Rally to shrink, which can be used for vibration control. PAM buffer mechanism has a simple structure, light weight, easy miniaturization, flexibility, without prejudice to the operation target, smooth action, no relative friction moving parts, no leakage and heat generation operations, low noise advantages. PAM constituting the rubber tube and braided interconnection friction rubber tube deformation energy and end constraints and other factors, PAM operating characteristic parameters such as inflation pressure, workload and shrinkage ratio between the non-linear, more difficult to establish the ideal mathematical model describes the PAM. When considering the PAM control variable, non-linear, this paper neural network PID control system for vibration analysis of its isolation effect.
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