DEVELOPMENT OF THE SYSTEM FOR EVALUATING THE CHARACTERISTICS OF FLOW INDUCED VIBRATION OF ELASTIC STRUCTURES IN CONNECTION WITH ADVANCED SYSTEMS

与先进系统相关的弹性结构流激振动特性评估系统的开发

基本信息

批准号：
03555045
负责人：
KANEKO Shigehiko
金额：
$ 4.99万
依托单位：
UNIVERSITY OF TOKYO
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1993
项目状态：
已结题

项目摘要

In this project, the system for evaluating the characteristics of flow-induced vibration of the following two cases of elastic structures was developed ; the first one is the case where elastic structures are moving in quiescent air flow such as antennas of satellites under ground test operations ; the second one is the case where elastic structures are vibrating subjected to one-dimensional leakage flow such as heat exchanger tubes and the load arms of electromagnetic disk files. As for the first case, the characteristics of the fluid force were found to be the function of amplitudes, frequencies, the configuration of edges of plates from the observation of the wave form of damped free vibrations of elastically supported plates. As for the second case, two types of experimental apparatus were designed and made for measuring the unstable fluid force acting on the elastically supported rigid plate and the cantilever elastic beam subjected to one-dimensional leakage flow. The unstable fluid force was measured by the following procedure ; (1) suppressing the unstable vibrations by adding additional fluid forces created by a piezo bymorph actuator installed at the inlet of the passage, (2) accounting the power input of the actuator. Finally, the validity of "the leakage flow approximation" was examined intensively both analytically and experimentally and the fact that this approximation is valid when the ratio between the channel length and the channel width is less than 10 was first found.

在该项目中，开发了用于评估以下两种弹性结构振动的特征的系统；第一种情况是，弹性结构在地面测试操作下以静态的空气流动（例如卫星天线）移动。第二种情况是，弹性结构正在振动一维泄漏流，例如热交换器管和电磁磁盘文件的负载臂。至于第一种情况，发现流体力的特征是振幅，频率，板边缘的构型的功能，从观察到弹性支撑板的阻尼自由振动的波形形式。至于第二种情况，设计并制造了两种类型的实验设备，用于测量作用在弹性支撑的刚性板上的不稳定的流体力和经受一维泄漏流量的悬臂弹性梁。通过以下步骤测量不稳定的流体力；（1）通过添加安装在通道入口上的压电bymorph执行器创建的其他流体力来抑制不稳定的振动，（2）考虑执行器的功率输入。最后，对“泄漏流量近似”的有效性进行了分析和实验检查，并且当首先发现通道长度和通道宽度之间的比率小于10时，这种近似是有效的。