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Mechanical Impact Test and Analysis Based on Anti High Overload Acoustic Sensor

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Abstract:

Hard target penetrating fuzes impact the targets accompany with the impact sound, the sound intensity correlates with acceleration of colliding, and spectrum with mediator of impacting. So, this paper presents a piezoelectric polymer film acoustic sensor to test the mechanical impact in place of conventional method based on the high 'g' acceleration transducer, and introduces its structure in detail, which is designed for anti high overload inertia force using two symmetrical piezoelectric parts to compensate the harmful impacting force. And its circuit are provided and proved its correctness by NI Multisim circuit emulation. Then, through mechanical impact experiments by standard hammer testing machine and data analysis using the MATLAB language, the rules can be got which sound intensity and impact force is near-linear positive dependency, short-time energy and zero-crossing rate of different mediums can be distinguished easily, the measurement of the impact acceleration value and identification of the impact media based on acoustic sensor are initial realization.

Keywords: ANTI HIGH OVERLOAD ACOUSTIC SENSOR; MECHANICAL IMPACT; PIEZOELECTRIC MICROPHONE

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/sl.2011.1524

Publication date: October 1, 2011

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