| Summary: | 博士 === 逢甲大學 === 機械與航空工程研究所博士班 === 96 === The active suspension systems are not suitable to suppress the producing vibrating wave of the instantaneous impact force（Example: during the operations of punch, hammering and forge）. In general, the traditional Mass - Spring - Damper - Passive Suppression Structure（MSD-P structure） is adopted to serve as the foundations of machine equipments that can reduce some disturbance of the impact force. But the vibrating suppression effects of them will arrive in the certain level only. In this paper, A Guiding Suppression Structure with Liquid Volume Transfer（LVT-G structure） is designed that can improve effectively the capability of suppression impulsive vibration waves in a low cost condition. For the purpose to prove that LVT-G structure has the function to improve the capability of suppression impulsive vibration waves. In this paper, the dynamic equations of LVT-G structure are derived; the related characteristics are analyzed; the computer simulations are conducted; and the capability of suppression impulsive vibration waves will be compared with that of MSD-P structure.
Compared the transfer functions of LVT-G structure and that of MSD-P structure, it can be found that the difference of the characteristics of the suppression vibrating waves is the square-term of numerator. This difference interrelated with the internal guiding direction, the ratio of the main cylinder area and the total area of guiding cylindersand the moving plate mass of the guiding cylinders. So, the internal guiding direction, the ratio of the main cylinder area and the total area of guiding cylinders and the moving plate mass of the guiding cylinders will be served as the system parameters and the related computer simulations of both impact transient response and frequency response will be conduced. These impact transient responses include impulse response, step response, half-sine response, rectangular response and triangular response.
Observing the simulation results for those suppression structures as the suitable parameters are adopted, U-LVT-G structure has the best performances in impact transient responses and peak resonate of frequency response. But U-LVT-G structure has generally the highest gain (the worst performance) in the high-frequency responses. As expected, U-LVT-G structure has the best suppression capability that adopted to serve as suppression vibrating wave in impact loading input. In conclusion, after some modification, we can apply those LVT-G structures to many vibration suppression purposes. How to simplify the structure, optimize the system parameters, control the internal pressure, and design systems for different areas of application are the important topics of future study.
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