Design and simulation of a mems high g inertial impact sensor
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Design and Simulation of a MEMS High G Inertial Impact Sensor. Y.P. Wang1, R.Q. Hsu1, C.W. Wu2 1Department of Mechanical Engineering, National Chiao Tung University, 1001 Ta-Hsueh Road, 300 Hsinchu, Taiwan Phone: +886-3-5712121 Ext.31934, Email: [email protected]

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Design and Simulation of a MEMS High G Inertial Impact Sensor

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Design and Simulation of a MEMSHigh G Inertial Impact Sensor

Y.P. Wang1, R.Q. Hsu1, C.W. Wu2

1Department of Mechanical Engineering, National Chiao Tung University,

1001 Ta-Hsueh Road, 300 Hsinchu, Taiwan

Phone: +886-3-5712121 Ext.31934, Email: [email protected]

2Department of Mechanical and Mechatronic Engineering, National Taiwan Ocean University

2, Pei-Ning Road, Keelung, Taiwan.

Speaker: Jing-Wen Shih


Outline

  • Introduction

  • The major goal of Inertial impact sensor

  • The micro impact sensor proposed in this study

  • Simulation

  • Conclusion

  • Reference


Introduction

  • Inertial sensors have been extensively utilized in science like inertial navigation systems and airbag triggers .

  • For high G(>300G) applications. Reaction times for conventional mechanical type impact sensors are not fast enough.


The major goal of inertial impact sensor

  • Designing an impact sensor that has a faster reaction time than conventional sensors and a mechanism that is sufficiently robust to survive the impact when a vehicle collides with a hard target is the major goal of this study.


Conventional inertial impact sensor

  • (a)cantilever beam type

  • (b)axial spring type


MDS System trigger

  • MDS: Mass- Damper- Spring Dynamic


  • Proof mass expressed by dynamic equation lamped system:


  • Use Laplace transformation to the second –order function for acceleration mass:


The micro impact sensor proposed in this study


To evaluate system reaction time, 4 different arrangements of spring and proof mass were tested.


The proof mass scale and coil number of the sensor


Simulation

  • Displacement versus applied forces for each sensor


The response time of the micro-sensor


Proof mass increases from 0.62 to 1.0, and thespring constant remains unchanged, the reaction time isdecreased.


Minimum G values for the sensors to be triggered


Reducing the spring constant, and retaining the proof mass, the reaction time decreased and the trigger G value decreased for sensors


Minimum G values for the sensors to be triggered


The plastic strain of the type 1 sensor in 21000G

  • With no significant interference in the x and z axis; consequently,sensor stability is very good.


Conclusion

  • This proposed impact sensor is intended for use at 8,000–21,000G. Four different designs were analyzed.

  • The impact sensors were sufficiently robust to survive the impact of at least 21,000G, four times higher than that of conventional inertial

    impact sensors.


References

  • F. Goodeough, Airbag boom when IC accelerometer sees 50 G,Electronics Design, pp.45-56, August. 8, 1991.

  • Tadao Matsunaga, Masayoshi Esashi, Acceleration switch with extended holding time using squeeze film effect for side airbag systems, Sensors and Actuators A:physical, vol. 100, Issue 1, pp.10-17 , August. 2002.

  • Military Standard, Mechanical Shock Test, MIL-STD-883E Method 2002.4, US Dept. of Defense, 2004.

  • Donald R. Ask eland, The science and engineering of materials, 1st edn,Taipei, Kai Fa, 1985, ch. 6, pp. 126-127.

  • Trimmer, W.S.N, Microrobots and Micromechanical Systems, Sensors and Actuators vol.19 no.3, pp. 267-287, 1989.

  • M. Elwenspoek, R. Wiegerink, Mechanical Microsensors, Germany,Springer, 2001.

  • Tai-Ran Hsu, MEMS & Microsystems Design and Manufacture,international edition 2002, Singapore, McGraw-Hill, pp. 157-159.


  • Thanks for your attention


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