盘型磁流变流体阻尼器悬臂转子系统响应时间测试
Response Time Measurement of a Cantilever Rotor with a Disk-Type Magnetorheological Fluid Damper
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摘要: 在不同的磁流变流体、激励方式、转子转速以及磁场强度情况下系统地测量了盘型磁流变流体阻尼器悬臂转子系统的响应时间。结果发现转子系统的响应时间由初始响应时间、快速响应时间和慢变响应时间3部分组成。转子系统的初始响应时间一般小于100ms,快速响应时间一般在50～400ms的范围内,两者均不可能为几个毫秒。初始响应时间及快速响应时间不仅与磁场强度、磁流变流体的组分和转子转速有关,而且还与激励方式有关。突加电流过程中的响应时间比去掉电流过程中的响应时间短。无论是在突加电流还是在去掉电流的过程中,都存在着一个由磁化或去磁过程引起的初始滞后时间。Abstract: The response time of a cantilever rotor with a disk-type magnetorheological(MR) fluid damper operating in a shear mode were measured at different excitation modes,rotational speeds and magnetic flux densities of different MR fluids.It was shown that the response time of the MR fluid damper rotor system consisted of the initial response time,rapid response time and last slow response time.The initial response time was less than 100 milliseconds;the rapid response time was about 50～400 milliseconds and both were impossible to be within a few milliseconds.The initial response time and the rapid response time were related not only to the magnetic flux density,magnetic particle weight ratio in the MR fluid and rotational speed,but also to the operating mode of the power supply.The response time of the rotor system during switching the step current off was longer than that during switching the step current on.There was an initial delay time at either switching the step current on or off,which was caused by the magnetizing or de-magnetizing process.
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Key words:
- aerospace propulsion system /
- magnetorheological fluid /
- response time /
- damper /
- rotor /
- vibration
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