传感器变得越来越便宜，但对于许多应用领域，传感器的成本还是过于昂贵。
Sensors are getting ever cheaper, but for many applications they are still much too expensive.
其应用于结构主动振动控制领域的研究，在国外和国内都开展了很多工作，但对于压电传感器和作动器的布局和尺寸优化方面的研究相对较少；
Much research work on active vibration control has been performed. However, the study on optimization of collocation and size of piezoelectric sensor and actuator is an ongoing research issue.
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