| Precise buffering is a controllable process in which the buffering force and range can be precisely controlled. Under high frequency impact, the control of dynamic characteristics and parameters of buffer is the key for the realization of the precise buffering. Besides the consideration of the single damping force value, the control of the system recoil and forward damping forces shall also be considered. The damping force can be defined as:the total force that the damper sets on the carrier in the whole firing process. When the energy from the high frequency impact and the buffer mass are considered as constant, and the maximum recoil displacement qmax and recoil damping displacement qmin are limited, the standard for optimal damping force control is:minimal damping force in the buffer process. The absolute value of damping force during the recoil and forward damping is no larger than the absolute value of recoil force, dynamic stability of the system under high frequency impact.In this thesis, a precise buffering structure for high frequency impact and strong damping is forwarded and a dynamic simulation model is built through the bond graph theory of system dynamics. Based on the CFD method, its dynamic characteristics during the firing process were simulated. Meanwhile, taking special account of temperature increases during buffer processes and performance states under various temperature conditions, the influence of temperature increase on the dynamic characteristics was analyzed. An experimental programmed was determined on the basis of the results, and the experimental research was carried out subsequently. A comparison of the experimental and simulation results is made, which verified the validation of the proposed dynamic simulation method. The goal of this thesis has been achieved and it has some references for late experiments and application of the overall precise buffer device. |
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