Design and Experiment Research on MEMS Vector Hydrophone Vibration Damping Structure

2015 ◽  
Vol 645-646 ◽  
pp. 931-941 ◽  
Author(s):  
Nan Guo ◽  
Guo Jun Zhang ◽  
Wen Dong Zhang
Keyword(s):  
Vibration Isolation ◽  
Shaking Table Test ◽  
Vibration Damping ◽  
Shaking Table ◽  
Interference Signal ◽  
Test Results ◽  
Novel Structure ◽  
Vector Hydrophone ◽  
Standing Wave Tube ◽  
Packaging Structure

A novel vibration damping structure is designed based on the existing package structure of MEMS vector hydrophone. It is desirable that this novel structure can isolate the vibration noise caused by working platform so as to improve the anti-noise ability of hydrophone. This novel structure is made of “dow corning” damping silicone rubber which is manufactured with a certain proportion because of its small Young’s Modulus. The hydrophone is fabricated in the form of original packaging structure firstly and then in vibration-isolation packaging structure. Laboratory tests by means of the shaking table test and standing-wave tube test are performed to validate the theoretical results. The test results prove that the vibration damping structure can effectively isolate the interference signal produced by working platform without affecting the sensitivity of hydrophone obviously.

Study on Dynamic Behavior of Ancient Timber Structures Roof

2013 ◽  
Vol 475-476 ◽  
pp. 1559-1562
Author(s):  
Jun Dai
Keyword(s):  
Dynamic Behavior ◽  
Vibration Isolation ◽  
Shaking Table Test ◽  
Shaking Table ◽  
Maximal Response ◽  
Construction Technology ◽  
Magnification Factor ◽  
Finite Element Software ◽  
Moderate Earthquake ◽  
Dynamic Magnification Factor

The roof model of the palace timber buildings was established according to the construction technology of the Ying-tsao fa-shih. Based on its analysis of dynamic behavior with shaking table test and ANSYS finite element software, the dynamic behavior of structure and its maximal response under different conditions were gotten, and also the dynamic magnification factor of the beams layer and the whole structure were gotten, at last the results got by shaking table test was compared with the numerical simulation. Research shows that the nature frequency of the model is 1.486 Hz which is much bigger than that of the whole structure; the maximal displacement of beam layer gradually increases with the increase of ground motion intensity and the height of structure; the vibration isolation performance of semi-rigid tenon-mortise joints in rare earthquake (400gal) is better than that in moderate earthquake (220gal) and frequent earthquake (110gal); the dynamic magnification factor between layers was about 1, and roof 0.9 or so.

Dynamic Research and Design on SINS Damping System in Vehicle

2011 ◽  
Vol 328-330 ◽  
pp. 1679-1683
Author(s):  
Jie Li ◽  
Rui Ping Tao ◽  
Jun Liu ◽  
Wei Chen
Keyword(s):  
Vibration Isolation ◽  
Inertial Navigation ◽  
Vibration Damping ◽  
Test Results ◽  
Characteristic Analysis ◽  
Isolation System ◽  
Vibration Isolation System ◽  
System Vibration ◽  
Research And Design ◽  
Damping Model

For the vibration noise problem of strap-down inertial navigation system in the vehicle, a better vibration damping system was designed. Based on the vibration characters of the vehicle environment, a vibration damping model fitted the SINS in the vehicle was presented; and then the mechanism of vibration damping system was designed especially; and then the design of vibration damping system was verified by using of the dynamic characteristic analysis, On the basis of the above analysis, the overall structure of actual vibration isolation system was built, and then the test for the vibration isolation system was made, the results show that the micro-isolation system for the SINS system vibration and noise has a better inhibition effect, and the applicability and the dependability of the vibration damping system is verified by the test results, which provides reference basis for the design of the strap-down inertial navigation damping system in the land vehicle and provides techniques for the better application of SINS in other fields.

Study on Seismic Isolation and Hi-Frequency Vibration Isolation Technology for Equipment in Nuclear Power Plant Using Aero Floating Technique

2020 ◽  
Author(s):  
Kiyotaka Takito ◽  
Osamu Furuya ◽  
Hiroshi Kurabayashi ◽  
Kunio Sanpei
Keyword(s):  
Nuclear Power ◽  
Seismic Isolation ◽  
Vibration Isolation ◽  
Shaking Table Test ◽  
Base Isolation ◽  
Ground Surface ◽  
Shaking Table ◽  
Maximum Acceleration ◽  
Seismic Motion ◽  
Floating Base

Abstract In Japan, most structures on the ground surface need seismic countermeasures because of frequently earthquakes. On the other hand, vibration isolation devices are applied to precision or important equipment in several facilities that dislikes vibration in order to reduce daily vibration. In general, vibration isolation devices are intended for high frequency and small amplitude range. However, it is difficult to cut off both vibration region caused by flying object collision and seismic motion with existing technologies. The authors propose insulation of equipment and vibration transmitted through the floor by floating equipment, and have. We have devised and built an air floating device that operates when a trigger input is applied to save the energy of this dynamically acting device. It was estimated by numerical calculation that the aero floating device keeps lifting stably in the condition with the air pressure in the auxiliary air chamber about 75 to 80 kPa. The performance specifications of the proposed device were verified from shaking table test. As a result, the effect of reducing the maximum acceleration by about 1/5 against the seismic motion of El Centro NS, Taft NS, Tohoku NS, and Hachinohe EW was confirmed by floating the mass on the frame assuming the equipment. From the obtained power spectrum diagram (PSD) of the response acceleration, it was confirmed that all frequency components up to 25 Hz is reduced by using proposed aero floating base isolation device.

scholarly journals Seismic energy response analysis of equipment-structure system via real-time dynamic substructuring shaking table testing

2019 ◽  
Vol 23 (1) ◽  
pp. 37-50 ◽  
Author(s):  
Jihong Bi ◽  
Lanfang Luo ◽  
Nan Jiang
Keyword(s):  
Real Time ◽  
Shaking Table Test ◽  
Seismic Energy ◽  
Shaking Table ◽  
Energy Calculation ◽  
Test Results ◽  
Structure System ◽  
Time Dynamic ◽  
Dynamic Substructuring ◽  
Shaking Table Testing

Dynamic equations are presented that have been deduced for a real-time dynamic substructuring shaking table test of an equipment-structure system, based on the branch mode substructure method. The equipment is adopted as the experimental substructure, which is loaded by the shaking table, while the structure is adopted as the numerical substructure. Real-time data communication occurs between the two substructures during the test. A real-time seismic energy calculation method was proposed for the calculation of energy responses, both in the experimental substructure and the numerical substructure. Taking a representative four-story steel frame/equipment model, real-time dynamic substructuring shaking table tests and overall model tests were executed. The proposed real-time dynamic substructuring shaking table testing method was verified by comparing the test results with shaking table test results for the overall model. The energy responses of each component in the equipment-structure system, using different connection types, also were studied. Changes in the connection types can lead to changes in the energy responses of the equipment-structure system, especially with respect to the equipment. The choice of the connection for the equipment-structure coupled system should take into account the operational performance objective of the equipment.

scholarly journals Research on Bending Rigidity at Flange Connections of UHV Composite Electrical Equipment

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Haibo Wang ◽  
Yongfeng Cheng ◽  
Zhicheng Lu ◽  
Zhubing Zhu ◽  
Shujun Zhang
Keyword(s):  
Numerical Simulation ◽  
Seismic Performance ◽  
Shaking Table Test ◽  
Effective Means ◽  
Electrical Equipment ◽  
Shaking Table ◽  
Calculation Formula ◽  
Test Results ◽  
Bending Rigidity ◽  
Earthquake Simulation

Pillar electrical equipment is an important part of substations. The application of composite materials in pillar equipment can facilitate the improvement of the seismic performance of electrical equipment. In this paper, the test of elastic modulus and bending rigidity was conducted for individual composite elements in insulators and arresters, and the calculation formula for bending rigidity at the composite flange cementing connections was put forward. The numerical simulation model for the earthquake simulation shaking table test of ±1,100 kV composite pillar insulators was established, in which the bending rigidity value for the flange cementing part was obtained by the test or calculation formula. The numerical simulation results were compared with the earthquake simulation shaking table test results, the dynamic characteristics and seismic response of the model were compared, respectively, the validity of the proposed calculation formula for flange bending rigidity of composite cementing parts was verified, and a convenient and effective means was provided for calculating the seismic performance of composite electrical equipment.

Shaking Table Test of Quarter Scale 20 Story RC Moment Frame Building Subjected to Long Period Ground Motions

2016 ◽  
Vol 11 (1) ◽  
pp. 97-105 ◽  
Author(s):  
Kuniyoshi Sugimoto ◽  
◽  
Kenji Yonezawa ◽  
Hideo Katsumata ◽  
Hiroshi Fukuyama ◽  
...  
Keyword(s):  
Shaking Table Test ◽  
Shaking Table ◽  
Test Results ◽  
Nonlinear Fem ◽  
Moment Frame ◽  
Building Model ◽  
Long Period ◽  
Frame Building ◽  
Long Duration ◽  
Current Design

Shaking table test of a quarter-scale 20-story reinforced concrete building model was carried out. Employed input waves were kinds of long period and long duration ground motion. Test results showed that structural slabs were fully effective for building strength, which could be expressed in detailed analysis using nonlinear FEM. However, the observed hysteretic damping after yielding was fairly smaller than the expected by the current design custom, which caused smaller and unsafe estimated response than that observed in the test.

Shaking table test on building in masonry structure with construction waste recycled brick

2014 ◽  
Vol 11 (4) ◽  
pp. 357-364
Author(s):  
Hui Su ◽  
Jian Wang ◽  
Xinpei Jiang ◽  
Yang Tan
Keyword(s):  
Seismic Behavior ◽  
Shaking Table Test ◽  
Concrete Block ◽  
Masonry Structure ◽  
Recycled Aggregate Concrete ◽  
Shaking Table ◽  
Recycled Aggregate ◽  
Test Results ◽  
Scaled Model ◽  
Construction Waste

Based on the shake table test on "tie column-ring beam-cast-in-place slab" construction waste recycled brick masonry structure, a 1/3 scaled model of 4 stories is tested to analyze the seismic behavior of the multi-storey masonry structure. The test is conducted with EL-Centro seismic wave, Taft wave and artificial wave to simulate the damages observed and the seismic response under different earthquake levels. On the basis of test results, the seismic performance of the model is good and the overall structure could satisfy seismic fortification requirements in the region of intensity 8. At the same time, there was no obvious difference between this masonry structure and recycled aggregate concrete block masonry structure. The lintel of the door and window damage seriously. The base damages more easily than the superstructure. Masonry structure with construction waste recycled brick can satisfy the requirement of the masonry structure buildings in eight degree of aseismatic design area.

scholarly journals Effect of Roof and Diaphragm Connectivity on Dynamic Behaviour of the PP-band Retrofitted Adobe Masonry Structures

2018 ◽  
Author(s):  
Navaratnarajah Sathiparan
Keyword(s):  
Shaking Table Test ◽  
Masonry Wall ◽  
Shaking Table ◽  
Experimental Program ◽  
Masonry Structures ◽  
Test Results ◽  
Structural Components ◽  
Masonry Unit ◽  
Seismic Safety ◽  
Lateral Drift

This paper discusses the shaking table test results of three PP-band (Polypropylene band) retrofitted quarter scale one-story masonry house models with different roof conditions. Better connections between masonry wall and roof connection are one factor to improve the seismic safety of the masonry houses. Past studies show that PP-band retrofitting improves the integrity of structural components and prevent the collapse of masonry structures during an earthquake. Although the effect of masonry unit type, surface plastering, the pitch of the PP-band mesh, PP-band connectivity in mesh and tightness of the mesh attachment to walls were studied by experiment program, the effect of the roof and its diaphragm connectivity on PP-band retrofitted masonry structure is nonexistent. Therefore, an experimental program was designed and executed for an understanding the effect of the roof and its connection on the dynamic behavior of the PP-band retrofitted box-shaped masonry house models. Results reveal that the PP-band retrofitted models with proper roof diaphragm improves the seismic behavior with respect to lateral drift, shear resistance and ductility.

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