first vibration mode meaning in English

第一振型

Thirdly , the principle in realization of d / a using on - chip pwm channel in the tms320f2812 - based system is analyzed . some methods of spwm , specially , nonsymmetry regular sampling are studied . avc system based on pwm technology is realized . finally , active vibration control experiment is performed about the first vibration mode of cantilever beam
三、研究了利用pwm通道实现da功能的工作原理,选用精度相对较高的不对称规则采样算法,利用dec2812设计并实现了基于脉宽调制技术的数模转换系统,完成了数据采集, ad转换, pwm波输出的全过程,并对转换结果进行了误差分析。