In order to realize the adaptive control of micro - flow , the piezoelectric materials must be driven by a signal with high voltage , adjustable frequencies and less harmonic 为了实现对微流场的主动控制,必须用一个高电压可变频的信号来驱动压电材料。
Due to the intrinsic direct and converse piezoelectric effects , piezoelectric materials have been widely used in engineering for the active shape or vibration control of structures 摘要利用压电材料固有的正、逆压电效应可以对结构变形和振动进行控制。
In chapter six , the research work of this thesis is summarized , and future work on passive / active vibration control with piezoelectric materials is proposed 对全文的研究工作进行了全面的总结，并展望了今后压电材料应用于结构振动控制的研究方向和研究内容。
According to piezoelectricity and spinning property , we found the optimal proportion of two composites , and 50wt / 50wt pvdf / pa11 fibers were suitable 二者均为较好的压电材料，从pvdf pa11共混纤维的可纺性和压电性两方面讨论， 50wt 50wt的pvdf pa11纤维性能最好。
The piezoelectric materials have strong electromechanical couple ability so that they are mostly used in intelligent structures especially for the problem of vibration control 压电材料(压电陶瓷和压电聚合物)具有很强的力电耦合效应而成为智能结构中应用最为广泛的智能材料。
By using 3 - d isoparametric element , the global stiffness matrix equation for the piezoelectric laminate is obtained on the bases of minimum principle of total potential energy 由于最小势能原理，建立了单元刚度矩阵和压电材料的整体刚度方程。并且推导了压电层合板的边界条件。
Additionally the project combines the mangesium to increase the sound quality that can be applied in the 3c electronic products and portable broadcasting system 另利用压电材料的特性制作微薄型新式音频发声器，并结合镁合金使音质更加提升，应用领域包括3c电子产品、可携式个人播放系统等。
According to the linear optimal control theory , the optimal control forces are determined , and the design of controller is discussed . at the same time , the application of piezoelectric actuator is studied 同时，对压电材料作动器的工作原理及在弹性连杆机构噪声控制中的应用进行了探讨。
According to the fundamental equations of elastic and electric fields , total potential energy for the electro - elastic laminate under general boundary conditions is established 引入了压电材料的空间等参数单元，并且从弹性力学与电学基础上，根据三维有限元法，建立了压电材料的能量泛函。
The piezoelectric materials have been widely used in the field of structural vibration control as a new type of smart materials because of their excellent mechanical - electrical coupling characteristics 近年来，压电材料作为一种新型的智能材料，以其良好的机电耦合特性，在结构振动控制领域得到了广泛应用。
