衝擊產生器的設計參數與其響應頻譜探討

陳煥章

doi:10.6342/NTU.2009.00428

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衝擊產生器的設計參數與其響應頻譜探討

Investigation of the Design Parameters and Its Response Spectrum of a Shock Generator

陳煥章 , Masters　　Advisor：翁宗賢　　

繁體中文 DOI： 10.6342/NTU.2009.00428

衝擊；響應頻譜； SRS ； ANSYS ； DYNA ； shock response ； SRS ； shock conditions ； LS-DYNA

Abstract │ Reference (23) │ Times Cited (4) │ Altmetrics

Abstract 〈TOP〉

Parallel Abstract 〈TOP〉

Electronic components often demand impact certifications prior to mass production. The purpose of fulfilling impact test is to prevent component failures in various working environments.  Typical half-sine or rectangular wave is employed as the shock pulse to simulate the shock in the real environment.  Unfortunately, lots of shock waves are not so easily to carry out.  They often consist of waves with various amplitudes over a wide span of frequencies.  Consequently, the more general and accepted method in shock rests is the so-called Shock Response Spectrum (SRS).
    The essential of the SRS method is to model the shock system as a simple damped-spring-mass system of one degree-of-freedom.  This dynamic system will response to a particular shock excitation with a maximum acceleration.  The spectrum of the maximum accelerations for various natural frequencies of the system constitutes the SRS.  If we can design a shock generator with its SRS covered the SRS of a real impact environment, then the cost and complexity of an impact facility can be largely reduced.
    Recently, Dr. Min-Han Chiu had developed an explosion-driven shock apparatus (called shock generator) which made the use of energetic material as the energy source at very low cost.  The generator can even meet the condition G listed in MIL-STD-883E.  However, experiments show that the apparatus broke down at the rod corner just after two test runs.  Numerical simulations also evidence the existence of several over-stresses regions in the test rig.  The simple and yet low cost shock generator deserves further improved design of its key dimensions, and hence its reliability, due to its possible wide applications.  This thesis explores dimension parameters which influence the performances of the shock generator via numerical simulation.  The software, ANSYS LS-DYNA, was used to compute the dynamic response of the system with various geometries subjected to the designated impact sources.  The improved design of the shock generator would provide better performance and reliability than the original one.  Moreover, this investigation will propose a precise amount of the explosive to drive the shock generator according to various shock specifications described in MIL-STD 883E.

Reference ( 23 ) 〈TOP〉

[1] Military Standard, MIL-STD-810F, Test Method Standard for Environment Engineering Considerations, US Dept. of Defense, 2000.
連結：
[8] G. V. Belov, E. P. Dyakin, A. A. Demidov, V. S. Zimalin, V. Y. Meltsas, O. N. Polevoi, G. S. Smirnov, Y. N. Chikin, V. I. Chizhov, N. I. Shustova, E. L. Yamolkin, “Gas-Cumulative Launching Device for Acceleration of Steel and Titanium Spherical Elements of Mass 0.2-2.1 g to Velocity 3-7.5km/s”, Int. J. Impact Eng., Vol. 29, pp105-116, 2003.
連結：
[9] I. A. Balagansky, V. A. Agureikin, I. F. Kobilkin, N. I. Nosenko, V. V. Naumov, A. V. Vinogradov, and A. I. Balagansky, ”Acceleration Device Based on High Explosive Chargr which Contains High Modular Ceramic Tube”, Int. J. Impact Eng., Vol. 22, pp813-823, 1999.
連結：
[10] 邱銘漢，抗震點火晶片研製，國立台灣大學，博士論文，民國97年7月。
連結：
[11] Military Standard, MIL-STD-883E Method 2002.4, Test Method Standard for Environment Engineering Considerations, US Dept. of Defense, 1998.
連結：

Times Cited (4) 〈TOP〉

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