基于光纤光栅传感的火炮关重件应变测试研究

发布时间：2018-05-30 23:02

本文选题：火炮 + 应变　；参考：《南京大学》2016年硕士论文

【摘要】：对火炮关键部件与重要部件(简称关重件)的动态应变过程研究是提高火炮性能的重要方法之一,准确的测试出火炮发射关重件瞬时应变大小,可以为火炮武器系统的结构强度与刚度设计和疲劳损伤分析提供重要参考依据。传统的有限元分析法由于对火炮实际结构进行了部分简化,很难对整个装配体系进行分析,而且这种计算结果常常因为无法提供测试结果对比而缺乏说服力,而基于电阻应变片的测试方法很容易受到温度、湿度等环境因素的影响,并且电阻应变片和电桥电路很容易受到电磁干扰影响,该测试方法只适合于一般环境的测量,在恶劣、复杂环境的测量难以获得准确的结果。本文通过研究基于光纤光栅传感的应变测试方法,首次提出利用光纤光栅传感技术进行火炮关重件应变测试。基于光纤光栅传感设计并开展万能实验机拉伸实验、等强度悬臂梁实验和应变与温度的分离测量实验,通过对比基于电阻应变片、基于数字图像和基于光纤传感的三种应变测试方法的实验结果,验证了光纤传感技术在应变测量领域的可行性与准确性。在此基础上开展霍普金森压杆超高速应变测试和开展某火炮样机实弹射击关重件动态应变测试,完成了不确定度评定,验证了光纤光栅应变测试数据的准确性与测试方法的优越性。本文首次在国内利用基于光纤光栅传感的应变测试方法开展火炮关重件动态应变测试,不仅为火炮武器系统的结构强度与刚度设计和疲劳损伤分析提供重要参考依据,同时突破了传统应变片测试方法的抗干扰难题,为电磁炮等具有较强电磁干扰源的武器装备关重件应变测试提供了创新方法,丰富了火炮应变测试的技术手段。
[Abstract]:The study on the dynamic strain process of the key components and important parts of the artillery is one of the most important methods to improve the performance of the artillery. The accurate measurement of the instantaneous strain size of the gun launches the closed parts can provide an important reference for the structural strength and stiffness design and fatigue damage analysis of the artillery weapon system. It is difficult to analyze the whole assembly system because of the partial simplification of the actual structure of the artillery, and the results are often lack of persuasion because of the inability to provide test results. And the resistance strain gauge based testing method is easily affected by temperature, humidity and other environmental factors, and the resistance strain gauge. The electric bridge circuit is easily affected by electromagnetic interference. The test method is only suitable for the general environment measurement, and it is difficult to obtain accurate results in the harsh and complex environment measurement. In this paper, the strain test of the artillery heavy parts is first proposed by fiber Bragg grating sensing technology by studying the strain testing method based on Fiber Bragg grating sensing. Based on the fiber Bragg grating sensing design, the tensile experiment of the universal experimental machine, the experiment of the equal strength cantilever beam experiment and the separation of strain and temperature are carried out. By comparing the experimental results based on the resistance strain gauge, digital image and fiber sensing based three strain testing methods, the fiber sensing technology is verified in the field of strain measurement. On the basis of the feasibility and accuracy, the Hopkinson compression rod ultra high speed strain test and the dynamic strain test of a gun prototype real bullet are carried out, the uncertainty evaluation is completed, and the accuracy of the fiber grating strain test data and the superiority of the test method are verified. The first time in this paper is based on Fiber Bragg grating in China. The dynamic strain test of the artillery heavy parts is carried out by the sensor strain testing method. It not only provides important reference for the structural strength and stiffness design and fatigue damage analysis of the artillery weapon system, but also breaks through the anti interference problem of the traditional strain gauge test method, and is a heavy part with strong electromagnetic interference source, such as electromagnetic cannon. Strain testing provides an innovative way to enrich the technical means of gun strain testing.
【学位授予单位】：南京大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TJ306;TP212

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