Nobeyama 45 m Radio Telescope主反射器的风振和操作振动测量
Wind- and Operation-Induced Vibration Measurements of the Main Reflector of the Nobeyama 45 m Radio Telescope
摘要：
射电望远镜主反射面的变形直接影响到射电望远镜的观测效果，因此对主反射面变形的评估是非常重要的。测量了日本野边山45米射电望远镜主反射镜在两种情况下的动态特性：第一种情况是指向观测工作时，第二种情况是反射镜静止不动，在观测停止时受到风载荷的作用。利用压电式加速度计测量了主反射面的动态特性。当望远镜在操作中，振动模式与一个节线水平或垂直的反射器上的诱导，这取决于是否反射器是在方位角或仰角平面移动，而在有风的条件下，振动模式，有两个到四个节线同时诱导。主导模态取决于风荷载的方向。
英文摘要：
As deformations of the main reflector of a radio telescope directly affect the observations, the evaluation of the deformation is extremely important. Dynamic characteristics of the main reflector of the Nobeyama 45 m radio telescope, Japan, are measured under two conditions: The first is when the pointing observation is in operation, and the second is when the reflector is stationary and is subjected to wind loads when the observation is out of operation. Dynamic characteristics of the main reflector are measured using piezoelectric accelerometers. When the telescope is in operation, a vibration mode with one nodal line horizontally or vertically on the reflector is induced, depending on whether the reflector is moving in the azimuthal or elevational planes, whereas under windy conditions, vibration modes that have two to four nodal lines are simultaneously induced. The predominant mode is dependent on the direction of wind loads.
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