高g微阵列加速度传感系统机械加固技术研究

【作者】 刘林；

【导师】 刘晓明；

【作者基本信息】 电子科技大学 ， 精密仪器及机械， 2008， 硕士

【摘要】 高g加速度传感器已经在很多场合得到了应用,尤其是在军事领域的应用,如控制侵彻弹药引信在预定层数起爆,监测核爆破的冲击过程,侵彻武器研制过程中的冲击过载测试等。近几年来,随着针对硬目标的侵彻武器研究的大范围发展,具备测量高g值的加速度传感器需求变得尤为重要[1]。本论文来源于预研项目“高g微阵列加速度传感系统技术研究”。本课题主要从事微阵列加速度传感系统的封装机械加固技术研究,从而完成高g微阵列加速度传感器技术研究中重要的技术指标——测量1.5×105g~2.0×105g加速度值,即加速度传感器在承受1.5×105g~2.0×105g的加速度冲击情况下,正常地工作并准确地输出信号。本论文研究内容包括如下四部分:第一部分:分析传感器的封装外壳,为了达到项目指标,提出新的外壳封装形式,并进行加工试验,确定外壳封装形式;第二部分:分析影响超声波热压焊接强度的因素,针对影响超声波热压焊接的主要四个工艺参数:焊接温度、焊接压力、焊接时间和超声功率,主要研究焊接温度与焊接压力对焊接强度之间的关系。通过分析,提出不同地工艺参数,进行加工试验,将加工好的传感器进行冲击试验,找出更佳的工艺参数;第三部分:将加工好的传感器进行冲击试验,通过冲击试验结果测试传感器性能,并提出改进方案;第四部分:通过有限元分析,模拟仿真超声波热压焊接过程,分析焊接温度与压力对焊接强度的影响。将仿真数据和试验数据比较,提出更优的加工工艺参数,以提高高g微阵列加速度传感器性能。更多还原

【Abstract】 High-g accelerometer is used in many fields, especially in military field, accelerometer is adopted in fuse system to control the penetration missiles to explode in the setting floor, monitor the impact process of nuclear blasting, and test the shock overload during the missile penetrating target. In the recent years, it’s very important for the penetration missile with accelerometer which can measure high-g acceleration for the demand of penetrating hard target.This thesis is based on a pre-research project,“A research of high-g micro-array accelerometer system”. This study is engaged in the mechanized reinforcement of high-g micro-array accelerometer system to finish one of the project technical index, which makes the accelerometer measure 1.5×105g~2.0×105g acceleration and insures the accelerometer work steadily with accurate signal. In this paper, there are four parts. Firstly, based on the analysis of packaging, new packaging forms are presented to achieve the technical index. After machining and testing new accelerometers, a good packaging form is determined.Secondly, qualitatively analyze the factors which influent the welding strength of ultrasonic welding, four main factors are obtained, there are welding temperature, welding pressure, welding time and welding power. In this study, the relationship between welding strength and welding temperature and relationship between welding strength and welding pressure are concerned. Different machining process parameters are proposed. After machining and testing new accelerometers, an array optical machining parameters are obtained.Thirdly, impact testing is adopted to test new accelerometers’properties. After testing and analyzing testing results, new packaging plan is proposed.Lastly, ultrasonic welding process is simulated by using finite element method. And relationship between welding strength and welding temperature and relationship between welding strength and welding pressure are achieved. Comparing experimental results with simulation results, a better array machining process parameters is given to improve the high-g accelerometer’s properties.更多还原