Sound Transmission Control with Intelligent Compound Structure

智能复合结构传声控制

基本信息

批准号：
10650250
负责人：
AKISHITA Sadao
金额：
$ 1.66万
依托单位：
Ritsumeikan University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

项目摘要

(1) Development of Sound Transmission Experimental setup;By reforming the readily maid experimental setup consisting of a loud speaker as sound source, duct and flange for securing the plate, we developed the new experimental setup for measuring the sound transmission performance of the intelligent compound plate of about 40 mm (broad) × 150 mm (long).(2) Development of Intelligent Compound Plate;We developed two types of the intelligent compound plate, dimension of both of which is 38 mm (broad) × 160 mm (long) × 0.6 mm (thickness), sandwiched by two sheets of stainless steel plate with 0.1 mm (thickness) for reinforcement, and on the surface of which three portions of sensor and actuators were formed. In the first production mono-morph piezoelectric plates were utilized, but the compound plate did not present good enough sensing of vibration in the plate. In the second production single bi-morph piezoelectric plate was introduced, and then the compound plate presented good enough sensing of vibration.(3) Sound transmission experiment of the intelligent compound structure;In the first production the feed-forward control system using the intelligent compound plate was constructed, based on identification of the transfer function matrix from the three actuators to the three sensors. The control system failed to present the target performance of sound transmission due to poor preciseness of the system identification. In the second production the feed-back control system was constructed after introducing the robust H-infinity control technique including the system identification. This control system proved to be successful in presenting the target performance of sound transmission.(4) Development of micro-pressure sensor;We tried to develop the micro-pressure sensor by utilizing the MEMS technique, but this production failed due to poorly forming the membrane electrode.

(1)声传输实验装置的研制；通过对现有的由扬声器作为声源、管道和固定板的法兰组成的简易实验装置进行改造，开发了新的测量智能复合材料声传输性能的实验装置约40毫米（宽）×150毫米（长）的板材。（2）智能复合板的开发；我们开发了两种类型的智能复合板，尺寸均为38毫米（宽）× 160毫米（长）×0.6毫米（厚），中间夹有两片0.1毫米（厚）的不锈钢板进行加固，其表面形成了三部分传感器和执行器。使用了变体压电板，但复合板没有表现出足够好的板内振动感测，在第二次生产中引入了单个双变体压电板，然后复合板表现出了足够好的振动感测。 (3)智能复合结构的声音传输实验;在首次生产中，基于三个执行器到三个传感器控制的传递函数矩阵的辨识，构建了使用智能复合板的前馈控制系统。由于系统辨识精度较差，系统未能呈现声音传输的目标性能。在第二次生产中，引入包括系统辨识在内的鲁棒H-无穷大控制后构建了反馈控制系统。成功呈现声音的目标表现(4)微压力传感器的开发；我们尝试利用MEMS技术开发微压力传感器，但由于膜电极成型不良而失败。