【摘要】 新型光学检测靶标能够在内场模拟复杂运动轨迹的外场目标,得益于结构组件中直线运动系统,但直线运动系统以悬臂梁形式安装,跨距大、刚度低,不能够保证靶标的检测精度。为此,首先根据欧拉-伯努利梁理论,提出了在有限空间内对其进行结构加强的解决方法;其次,结合线性模组结构动力特性,在其周围合理布置加强梁、加强板,并采用集成优化设计确定加强组件的最优尺寸;最后,对安装后的直线运动系统进行模态分析与测振实验。仿真分析与实验结果显示:直线运动系统加固后整体结构一阶、二阶固有频率分别为36、55 Hz,与仿真设计值32、54 Hz吻合的较好,与加固前一阶固有频率14 Hz相比较,提高了1.86倍。结果验证了加强组件设计的合理性与可靠性,加强后的直线运动系统结构性能满足新型光学检测靶标所要求的质量轻、刚度高、抗干扰能力强等要求。更多还原

【Abstract】 A novel type of optical testing target indoor can be used to simulate the outfield target with complex trajectory, profited from the linear motion system in the structural components. But, the problem of the large span and low stiffness linear motion system of novel optical testing target reduced the testing accuracy of the novel optical testing target. So, firstly, based on the Euler-Bernoulli beam theory, a solution to strengthen the structure in a limited space was proposed. Then, combined with the dynamic characteristics of the linear module structure, the layout of the strengthened beam and the reinforcing plate around it was arranged and the dimensions of the strengthening components were determined by an integrated optimization technique. Finally, modal analysis and vibration test for linear motion system after the installation of the department were implemented. Results show that the first order natural frequency and the second order natural frequency of integral structure of linear motion system are 36 and 55 Hz respectively, and the experimental data are in good agreement with the simulation design date that are 32 and 54 Hz respectively and increases by 1.86 time comparing with the initial structure that first order natural frequency is 14 Hz. These results verify the rationality and reliability of the design of reinforced assembly, at the same time, the structural performance of the strengthened linear motion system meets the requirements of the novel photoelectric testing target, such as light weight, high rigidity, strong anti-interference ability and so on.更多还原