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Ren X.-J.,Beijing Institute of Technology | Ren X.-J.,The Third Engineer Scientific Research Institute | Chen H.-L.,Airborne
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2012

Strong shock wave, electro-magnetic pulse and light-heat effect occur when condensational explosive explodes. Measurement circumstance is formidable in near zone of explosion. Conventional piezo-resistance silicon sensors can't meet the measurement demand. In order to get the detonation parameters of the near zone of explosion and provide reference values for explosion damage assessment on protective structures, PVDF piezo-electric sensors were made and calibrated with a SHPB. The test of TNT explosion was conducted to examine the validity of the sensors. The difference between test data and calculations with AutoDyn was less than 10%. It was shown that a self-made PVDF piezo-electric sensor after anti-interference treatment is suitable for measurement of shock wave in near zone of explosion. Source


Ren X.-J.,Beijing Institute of Technology | Ren X.-J.,The Third Engineer Scientific Research Institute | Zhang Q.-M.,Beijing Institute of Technology | Liu R.-C.,The Third Engineer Scientific Research Institute
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2015

Different layered model structures of protective engineering were constructed, their distribution layers were made with sand or hollow foam spheres, respectively. The anti-blast performance of the layered structure with hollow foam spheres as distribution layers was studied using standard tests, contrast tests and repeated anti-blast tests with a big scale and group charge. The results showed that the protective layer is damaged more seriously with hollow foam spheres as distribution layers than it does with sand as distribution layers, but the former's pressure at the same position under distribution layer is far less than the latter's; compared with the latter which is the traditional structure, the new style layered structure with hollow foam spheres as distribution layers has a better protective property. ©, 2015, Chinese Vibration Engineering Society. All right reserved. Source


Wu J.,The Third Engineer Scientific Research Institute | Zhuang T.-S.,The Third Engineer Scientific Research Institute | Yan P.,The Third Engineer Scientific Research Institute | Xiao L.,The Third Engineer Scientific Research Institute
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2013

Here, in order to perform anti-blast performance experimental study for underwater engineering structures and equipments, a large-sized underwater explosion test facility with multi-function was design and built. The facility included an explosion cistern, a lightweight steel sliding and a lifting equipment, a reserving and pressuring equipment, a screen bed base, an underwater explosion pressure test system and a test room. Based on one-dimensional elastic plane wave theory, the main problems of the structural design and the anti-blast and anti-vibration performance of the explosion cistern were analyzed. The transmission of stress wave and the damage model of different mediums of the cistern were studied when longitudinal waves injected the explsion cistern. Using a bubble curtain technology, the feasibility of the protection measure to reduce shock wave of underwater explosion was tested and discussed. The rationality of the structural design for the facility and the effectiveness of protection measure to reduce shock wave of underwater explosion were tested and verified. Source

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