排序方式: 共有19条查询结果,搜索用时 31 毫秒
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研究了运用压电陶瓷作动器对碳纤维增强复合材料(CFRP)格栅反射器的型面主动控制。首先,采用了一种具有独立电压自由度的梁单元,以及考虑高阶剪切变形的板单元,对主控格栅反射器进行有限元建模;运用能量变分哈密尔顿原理推导了主控格栅反射器的有限元控制方程,并给出了反射面型面残余均方根(RMS)误差最小的电压最优控制方法。然后,研究了在典型载荷下,反射面残余RMS误差最小的PZT作动器位置分布的优化配置问题;提出了一种将遗传算法和梯度投影方法相结合的改进优化方法,用来求出在限定作动器数量的条件下,作动器几何位置的优化配置,使控制后反射面的残余RMS误差最小;给出的数值算例验证了方法的正确性和有效性。最后,研制了格栅反射器型面主动控制的实验样机,针对反射器的初始制造误差进行了型面主动控制,验证了控制方法的可行性和有效性。 相似文献
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以压电陶瓷为作动器,并采用独立模态控制法,对冲击载荷作用下的大柔度悬臂梁前三阶模态进行了振动主动控制研究。实验结果表明,使用独立模态控制方法,能有效地抑制悬臂梁的振动,控制效果非常明显。采用模态滤波和相移控制器进行模态分离和相位调节,可获得最大结构阻尼,取得良好的动态控制效果。 相似文献
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Takashi Miyachi Masayuki Fujii Nobuyuki Hasebe Osamu Okudaira Seiji Takechi Toshiyuki Onishi Shigeyuki Minami Masanori Kobayashi Takeo Iwai Eberhard Grün Ralf Srama Nagaya Okada 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2011
The responses of a piezoelectric lead zirconate titanate (PZT) element to hypervelocity collisions were experimentally studied. In this study, the particles of masses ranging from 0.3 to 10 fg were made to collide with PZT at velocities between 20 and 96 km/s. The amplitude and the corresponding rise time of the single-pulse output signals that were produced in the piezoelectric PZT element were measured to determine the possible collision states. The results revealed an apparently multimodal output; three classes were assumed to be involved in the pulse formation mechanism. The amplitude and rise time were sensitive to the collision velocity. The multimodal behavior implied that the PZT-based cosmic dust detectors should be calibrated according to the class they belong to. 相似文献
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开环FOG中PZT调制器的在线研究 总被引:3,自引:0,他引:3
从理论上分析了PZT(压电型)光纤相位调制器在开环FOG(光纤陀螺)中的应用特点,研究了它的调制系数和调制相位延迟变化对开环FOG性能的影响;并设计了两种独立的在线测试方法对它们进行了温度特性研究,利用所得数据,用最小二乘多项式拟合的方法分别得到了它们的温度模型.研究表明,在实验温度范围内,开环FOG的相位调制系数KGP随温度呈线性变化,而调制相位延迟α随温度呈二次的变化. 相似文献
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压电-光纤综合结构健康监测系统的研究及验证 总被引:2,自引:0,他引:2
以某型无人机机翼盒段试验件为对象,进行了压电-光纤综合结构健康监测系统的研究。自主研发了国内首台集成压电多通道扫查系统,可实现多达552个激励 传感通道的损伤自动扫查,并同光纤光栅解调系统组合,自行开发了集成健康监测系统软件,构成了压电-光纤综合结构健康监测系统。基于该系统进行了大型碳纤维复合材料盒段试验件弯扭强度实验过程中的结构健康监测功能验证研究,监测结构尺寸达4000 m×1200 m×0.265 m,监测对象包括结构的应变场分布及抽钉失效。系统监测了全盒段上下壁板共34点的应变场分布情况,应变场监测准确;监测系统不仅对结构抽钉的缺失实现了准确监测,而且可以分辨所实验结构的4种抽钉缺失程度。 相似文献
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S. Takechi K. Nogami T. Miyachi M. Fujii N. Hasebe T. Iwai S. Sasaki H. Ohashi H. Shibata E. Grün R. Srama N. Okada 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2009
A cosmic dust monitor for use onboard a spacecraft is currently being developed using a piezoelectric lead zirconate titanate element (PZT). Its characteristics of the PZT sensor is studied by ground-based laboratory impact experiments using hypervelocity particles supplied by a Van de Graaff accelerator. The output signals obtained from the sensor just after the impact appeared to have a waveform that was explicitly related to the particle’s impact velocity. For velocities less than ∼6 km/s, the signal showed an oscillation pattern and the amplitude was proportional to the momentum of the impacting particle. For higher velocities, the signal gradually changed to a single waveform. The rise time of this single waveform was proportional to the particle’s velocity for velocities above ∼6 km/s. The present paper reports on results for the low velocity case and especially discusses the effect of an outer coating of the sensor with a paint, which is used to reduce heating by solar radiation. 相似文献
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