根据复合材料超声直线电机振动体具有两个固有频率的特点，设计了一种能综合调整激励信号幅值及频率的超声直线电机驱动源。
Based on the microcosmic elastic mechanics, a PWM driver of ultrasonic linear motor is proposed in this paper, whose frequencies and amplitudes could be adjusted synthetically.
在动态应变信号测试中，经常需要根据信号的幅值不断调整放大器的放大倍数，测量电路复杂，精度低。
Measuring the dynamic strain involves the constant modification of gain, as determined by the signal amplitude. This practice suffers from the complex test and the low accuracy.
在动态应变信号测试中，经常需要根据信号的幅值不断调整放大器的放大倍数，测量电路复杂，精度低。
Measuring the dynamic strain involves the constant modification of gain, as determined by the signal amplitude. This practice suffers from the complex test and the low accuracy.
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