暗物质硅阵列探测器的动态性能分析

发布时间：2018-06-15 10:55

本文选题：暗物质探测卫星 + 静力分析　；参考：《北京工商大学》2014年硕士论文

【摘要】：暗物质粒子探测卫星的首要科学目标是寻找暗物质粒子，整颗卫星包括塑闪阵列探测器、硅阵列探测器（STK）、BGO量能器、中子探测器。作为卫星的有效载荷，暗物质粒子探测卫星必须经历发射过程的考验，在发射过程中，要受到相应的惯性力、以及正弦振动和随机振动，，要求起支撑作用的硅阵列探测器要有足够的刚度、强度和优良的动态性能；硅阵列探测器是我国目前研制的规模最大、结构最复杂的空间探测器系统，无法采用理论分析,主要采用有限元分析结合试验的方法进行设计。本文应用INVENTOR和大型通用有限元分析软件ANSYS，对硅阵列探测器在初样至鉴定样阶段的多个设计方案进行了有限元建模研究、各种工况下的有限元动态分析以及结构的改进设计。论文首先以单层蜂窝板为研究对象，通过有限元分析结合振动试验，对蜂窝板的有限元建模方案进行了研究，并将其应用于整尺寸蜂窝板，结合复合材料失效准则，对蒙皮和支撑结构的材料进行了选取，根据环境模拟试验条件，完成了整尺寸蜂窝板的超载静力计算和模态计算，对其设计进行了评估；在此基础上，建立了探测器整体的有限元模型，并对其进行了超载静力分析、模态分析、正弦振动分析以及随机振动分析，参与了暗物质硅阵列探测器初样的振动试验，并对有限元结果和试验结果进行了对比分析，对暗物质硅阵列探测器初样的设计方案进行了评估；根据评估结果，提出了单层板的3种改进方案，并对其进行了对比分析，对改进后的硅阵列探测器进行了超载静力分析和模态分析，并对其力学动态特性进行了评定。通过研究工作，得到了与实际形状蜂窝芯子蜂窝板模态结果，及振动试验扫频结果吻合度较高的蜂窝板简化建模方案；结合有限元方法，并考虑到实际加工的因素，确定了蜂窝板蒙皮及支撑结构的材料；提出了满足强度、刚度以及动态性能要求的暗物质硅阵列探测器设计方案。研究结果为产品的进一步改进提供理论依据，研究工作具有较强的理论和实际应用价值。
[Abstract]:The primary scientific goal of the dark matter particle detection satellite is to search for dark matter particles. The whole satellite includes a plastic flashover array detector, a silicon array detector, a BGO calorimeter and a neutron detector. As the payload of the satellite, the dark matter particle detection satellite must undergo the test of the launching process. During the launching process, it must be subjected to the corresponding inertial force, as well as sinusoidal vibration and random vibration. The silicon array detector must have enough rigidity, strength and excellent dynamic performance, the silicon array detector is the largest and most complicated space detector system developed in our country at present, so it can not be analyzed theoretically. The method of finite element analysis combined with test is used to design. In this paper, by using Inventor and ANSYS, the finite element modeling, dynamic finite element analysis and structural improvement of silicon array detector in the initial stage to the identification stage are studied. Firstly, the finite element modeling scheme of honeycomb plate is studied by finite element analysis combined with vibration test, and it is applied to the whole size honeycomb plate, and combined with the failure criterion of composite material. The materials of skin and bracing structure are selected. According to the conditions of environmental simulation test, the static calculation and modal calculation of the whole size honeycomb plate are completed, and the design of the honeycomb plate is evaluated. The finite element model of the whole detector is established, and the static analysis, modal analysis, sinusoidal vibration analysis and random vibration analysis of the detector are carried out, which participate in the initial vibration test of the dark matter silicon array detector. The results of finite element analysis and experiment are compared, and the design scheme of the initial sample of dark matter silicon array detector is evaluated, according to the evaluation results, three improved schemes of single layer plate are put forward, and the results are compared and analyzed. The static analysis and modal analysis of the modified silicon array detector are carried out, and the dynamic mechanical characteristics of the detector are evaluated. Through the research work, the modal results of honeycomb plate with actual shape, and the simplified modeling scheme of honeycomb plate with high coincidence with the results of vibration test and frequency sweep are obtained, the finite element method is combined and the factors of actual machining are taken into account. The materials of honeycomb sheet skin and supporting structure are determined, and the design scheme of dark matter silicon array detector which meets the requirements of strength, stiffness and dynamic performance is proposed. The research results provide theoretical basis for further improvement of the product, and the research work has strong theoretical and practical application value.
【学位授予单位】：北京工商大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：V476;P145.9

【参考文献】