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气囊弹簧是主动隔振器中重要的元器件,传统将其简化为恒定刚度和阻尼的并联系统,致使低频段主动控制效果不好。针对该问题,提出研究一种主动隔振器中使用的膜式气囊弹簧,其主动作动力的传递通道有较强非线性,采用不同于传统的简化方式,将气囊弹簧简化为刚度和阻尼可变的并联系统,针对主动作动力通道的传递函数,设计了参数辨识实验。通过实验数据分析,得到了刚度和阻尼随着振动幅值和振动频率变化的规律。
Airbag spring is an important component in the active vibration isolator. Traditionally, the airbag spring has been simplified as a parallel system with constant stiffness and damping, resulting in poor active control in the low frequency range. In view of this problem, it is proposed to study a membrane-type airbag spring used in an active vibration isolator, which has a strong non-linear transmission path of active power. By adopting a simplified method different from the conventional method, the airbag spring is simplified into a stiffness and a damping Variable parallel system, aiming at the transfer function of the active power channel, a parameter identification experiment is designed. Through the analysis of experimental data, the law of stiffness and damping change with vibration amplitude and vibration frequency is obtained.