COTS electronics & the naval shock environment

2002 ◽  
Author(s):  
S.A. Brown
Keyword(s):  
Shock Environment

Reliability and maintenance for performance-balanced systems operating in a shock environment

2020 ◽  
Vol 195 ◽  
pp. 106705 ◽  
Author(s):  
Xiaoyue Wang ◽  
Xian Zhao ◽  
Siqi Wang ◽  
Leping Sun
Keyword(s):  
Shock Environment

Study on Dynamics Characteristics of SINS Damping System in Shock Environment

2013 ◽  
Vol 397-400 ◽  
pp. 355-358
Author(s):  
Xia Qing Tang ◽  
Jun Qiang Gao ◽  
Li Bin Guo ◽  
Huan Zhang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Optimal Design ◽  
Vibration Isolation ◽  
Damping Coefficient ◽  
Shock Environment ◽  
Stiffness And Damping Coefficient ◽  
Stiffness And Damping ◽  
Element Method

Dynamics characteristics of SINS damping system in shock environment were analyzed by finite element method, as the deformation of dampers may leads to the accuracy loss of SINS. In addition, the influence of absorber stiffness and damping coefficient on dynamics characteristics were studied. The results indicate that the decoupling of vibrations is significant for the accuracy of SINS. However, considering the almost impossible of completely decoupled vibrations, its necessary to carry out an optimal design of the absorber stiffness and damping coefficient to maintain the accuracy of SINS while meeting the requirement of vibration isolation.

Mechanical and Electrical Characteristics of the Electromagnetic Relay under Vibration and Shock Environment

2009 ◽  
Author(s):  
Wanbin Ren ◽  
Huimin Liang ◽  
Yinghua Chen ◽  
Li Cui ◽  
Lizhong Wang ◽  
...  
Keyword(s):  
Electrical Characteristics ◽  
Electromagnetic Relay ◽  
Shock Environment

Technical Note: Shock Testing Using a Vibrator

2001 ◽  
Vol 8 (1) ◽  
pp. 83-99
Author(s):  
Samir N. Y. Gerges
Keyword(s):  
Control Systems ◽  
Digital Control ◽  
Technical Note ◽  
The State ◽  
Shock Testing ◽  
Breakdown Time ◽  
Digital Control Systems ◽  
Shock Environment ◽  
Set Up ◽  
State Of Art

In recent years there has been an increasing tendency to use shakers rather than shock devices, for shock testing. The advantage of using the same transducers and fixtures for both vibration and shock tests, is that not only does this reduce initial equipment costs; it also complements the sophisticated digital control systems currently available and significantly reduces set-up and breakdown time in the laboratory. This paper presents a review of the state of art on testing by simulating a shock environment with shakers.

Shock environment design for space equipment testing

2016 ◽  
Vol 231 (6) ◽  
pp. 1154-1167 ◽  
Author(s):  
OMF Morais ◽  
CMA Vasques
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Test System ◽  
Test Apparatus ◽  
Shock Test ◽  
Shock Testing ◽  
Test Parameters ◽  
Shock Environment ◽  
Definition Of

The main specification in the verification by testing of space hardware vulnerability to shock excitations is the shock response spectrum. Although it compiles the most relevant information needed to describe the overall shock environment characteristics, shock testing still poses various difficulties and uncertainties concerning the suitability and operation of the shock test system used, and the adequate definition of the underlying test parameters. The approach followed from the interpretation of typical shock testing specifications to the development, validation, and characterization of the developed shock test system, including the definition and design of the relevant parameters influencing the attained shock environment, is described in this paper. The shock testing method here presented consists of a pendular in-plane resonant mono-plate shock test apparatus where the structural response of the ringing plate depends upon well-defined controllable parameters (e.g. impact velocity, striker shape, mass, and contact stiffness), which are parametrically determined to achieve the target shock environment specification. The concept and analytical model of two impacting bodies are used in a preliminary analysis to perform a rigid body motion analysis and contact assessment. A detailed finite element model is developed for the definition of the ringing plate dimensions, analysis of the plate dynamics and virtual shock testing. The assembled experimental apparatus is described and a test campaign is undertaken in order to properly characterize and assess the design and test parameters of the system. The developed shock test apparatus and corresponding finite element model are experimentally verified and validated. As a result of this study, a reliable finite element modeling methodology available for future shock test simulation and prediction of the experimental results was created, being an important tool for the adjustment of the shock test input parameters for future works. The developed shock test system was well characterized and is readily available to be used for shock testing of space equipment with varying specifications.

Shock Analysis on Dual-Mass Silicon Micro-Gyroscope

2011 ◽  
Vol 338 ◽  
pp. 401-405 ◽  
Author(s):  
Yun Fang Ni ◽  
Hong Sheng Li ◽  
Li Bin Huang ◽  
Bo Yang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Reliability Index ◽  
Analytic Solution ◽  
Reliability Prediction ◽  
Lumped Mass ◽  
Mass Model ◽  
Shock Response ◽  
Lumped Mass Model ◽  
Shock Environment

Survivability in shock environment is an important reliability index of silicon micro-gyroscope. Shock response of dual-mass silicon micro-gyroscope is investigated in this paper. A lumped mass model was established for the micro-gyroscope based on the characteristics of the dual-mass structure. Analytic solution to the response of the structure under shock load in a half-sine acceleration form was then acquired. The analytic solution was applied to calculate the shock response of a well designed dual-mass silicon micro-gyroscope in our laboratory, while the correctness of it was verified with finite element method (FEM) in ANSYS. The analytic solution is serviceable in reliability prediction of dual-mass silicon micro-gyroscope in shock environment.

Study on Designs of Stoppers for MEMS Devices in Shock Environment

2012 ◽  
Vol 184-185 ◽  
pp. 510-515 ◽  
Author(s):  
Tao Jiang ◽  
Jian Zhou ◽  
Fei Feng
Keyword(s):  
Stress Wave ◽  
Mems Devices ◽  
Dynamics Model ◽  
Reliability Design ◽  
Traditional Design ◽  
Sharp Stress ◽  
Shock Dynamics ◽  
Shock Resistance ◽  
Shock Environment

Stoppers are commonly used to improve the shock resistance of MEMS devices. However, the collision between MEMS structure and stoppers in shock environment may lead to emergence of the stress wave, resulting in the failure of devices. Therefore, MEMS devices designed based on current statics theory is unreliable. After analyzing the method and principle for MEMS reliability design, the shock dynamics model was established. Based on the model, the response of the traditional design and designs with different stoppers to shock was researched. At last, protection performances of different stoppers were evaluated. Results showed that the use of stoppers could improve the shock resistance of the device obviously, but hard stoppers would cause to the emergence of the sharp stress wave. Elastic stoppers had excellent protection ability which could strengthen the shock resistance of the device greatly.

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