Mass Measurement Using a Dynamic Vibration Absorber under Weightless Conditions
Mass Measurement Using a Dynamic Vibration Absorber under Weightless Conditions
复制标题
在失重条件下使用动态减振器进行质量测量
DOI：
10.9746/sicetr1965.32.1145
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
K. Araki
中科院分区：
文献类型：
--
作者：
T. Mizuno;K. Araki
提出了一种以动态吸振器为测量装置的新型失重条件下的质量测量系统。在该系统中，被测物体被固定在离旋转轴一定距离的转台（转子）上。由于它使转子不平衡，在旋转过程中产生的离心力的振幅与质量成正比。它作为一种谐波激励，迫使支撑工作台的结构振动。然而，连接在结构上的动态减振器被调谐或控制以将振动降至零。当结构完全不运动时，减振器质量的振动方式使质量与位移振幅的乘积等于不平衡量，即待测质量与其与旋转轴的距离的乘积。因此，物体的质量是通过测量吸收器质量的位移振幅来确定的。本文阐述了所提出的质量测量系统的原理和特点。实验是用一种装有主动动力减振器的装置进行的。由于吸收器的固有频率可以通过反馈参数进行调谐，因此该装置可以在各种转速下进行测量。实验结果证明了所提出的质量测量系统的可行性。
A new type of mass-measurement system under weightless conditions is proposed which uses a dynamic vibration absorber as a measuring device. In this system, an object to be measured is fixed to a rotating table (rotor) at a distance from the rotation axis. Since it makes the rotor unbalanced, a centrifugal force whose amplitude is proportional to the mass is generated during rotation. It works as a harmonic excitation and forces a structure supporting the table to vibrate. However, a dynamic vibration absorber attached to the structure is tuned or controlled to reduce the vibration to zero. When the structure does not move at all, the absorber mass vibrates in such a way that the product of the mass and the displacement amplitude is equal to the amount of unbalance, that is, the product of the mass to be measured and its distance from the rotation axis. Therefore, the mass of the object is determined by measuring the displacement amplitude of the absorber mass. In this study, the principles and features of the proposed mass-measurement system are clarified. Experiments are carried out with a developed apparatus having an active dynamic vibration absorber. This apparatus can perform measurement at various rotational speeds because the absorber’s natural frequency can be tuned by a feedback parameter. Experimental results demonstrate the feasibility of the proposed mass-measurement system.