摘要
当前所进行的基于面内振动模态的超声电机研究需要进行定子面内振动模态测试,并且其他类型的超声电机也经常需要检查是否出现了不需要的面内振动模态而导致效率低下。Polytec公司的3-D激光测振设备可用于超声电机定子面内振动模态的测试,但价格非常昂贵。
因此基于以上情况,本文主要的研究内容和工作如下:
(1)在分析超声电机定子所用的面内振动模态的基础上,利用一维单点面内振动激光测头LSV065-306F(Polytec公司)构建用于超声电机定子面内振动模态测试系统。
(2)根据超声电机响应快、定位自锁等优点,选用超声电机作为X-Y定位平台的驱动电机,实验证明定位精度可以到微米级。
(3)采用直接数字频率合成技术生成模态实验所用的激励信号;采用基2时间的FFT算法处理扫频测试数据,得出振动频响谱,以此来确定各阶模态频率;利用最小二乘拟合法处理定频测试数据,得出各点的振动振幅、相位,在拟合出振型。
(4)利用所开发的测试系统进行一些定子的面内振动模态测试,取得了较好的结果。
This thesis is a part of the National Natural Science Foundation (No. 50235010) : The development of in-plane vibration measurement system with Laser Doppler vibrometer.
Currently, the research of such USM based on in-plane vibration mode needs to test the in-plane vibration mode, and the other types of USMs also need to check whether there existing such in-plane vibration mode, which is useless and leads to inefficiencies.The 3-D laser vibration measurement system of the Polytec company could be used to test the in-plane vibration mode of the stator of USM, but it is very expensive.
Based on the above reason, the main works of the thesis are summarized as follows:
(1) Analysing the characteristics of in-plane vibration mode and using the laser sensor head LSV065-306F (Polytec Company)to develop a measurement system which could be used for in-plane vibration modal testing.
(2) According to the good characteristics ( rapid response,self-locking and etc.) of USM, we use two traveling wave type rotary ultrasonic motors(TRUM) as the driver of the X-Yworktable, which can reach 2μm in precision.
(3 ) Using DDS technique to generate incentive signal for modal testing; using radix-2 FFT algorithm to handle sweep signal, then we can get the Amplitude- Frequency map. Through the Amplitude- Frequency map, we can find the modal frequency; using the Least-squares fitting method to get the amplitude and phase of every point, then drawing the modal shape.
(4) Using the measurement system to measure some stators and achieving good results.
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