Isolation system by leaf spring support

2017 ◽  
Vol 2017 (0) ◽  
pp. J1010205
Author(s):  
Kojiro NAKAJIMA ◽  
Tetsuya WATANABE
Keyword(s):  
Leaf Spring ◽  
Isolation System ◽  
Spring Support

scholarly journals Seismic isolation system using rhombus link and leaf spring (Vertical isolation)

2020 ◽  
Vol 86 (887) ◽  
pp. 20-00010-20-00010
Author(s):  
Naoki IIJIMA ◽  
Tetsuya WATANABE ◽  
Yoshinori NARISAWA
Keyword(s):  
Seismic Isolation ◽  
Leaf Spring ◽  
Isolation System

Simulation Analysis and Experimental Research on Circular Piezoelectric Bone-Conduction Headphone

2014 ◽  
Vol 1030-1032 ◽  
pp. 2313-2319
Author(s):  
Ping Zeng ◽  
Yan Hui Chen ◽  
Ying Ying Gao ◽  
Yan Peng Li ◽  
Guang Ming Cheng
Keyword(s):  
Ambient Noise ◽  
Simulation Analysis ◽  
Bone Conduction ◽  
Low Frequency ◽  
Frequency Region ◽  
Leaf Spring ◽  
Hearing Device ◽  
Bone Conduction Hearing ◽  
Close Distance ◽  
Spring Support

Based on the theory of bone conduction, a novel circular piezoelectric bone conduction hearing device with a new structure of leaf spring support and excellent low-frequency response is proposed in this paper. The simulation analysis of the circular piezoelectric vibrators with different support ways was carried by ANSYS. And the prototype of piezoelectric bone conduction headphone supported by the optimal way was produced. The experimental test was conducted and the results showed that the maximum response amplitude of headphone could reach up to 26.14μm in the low frequency region ranging from 20Hz to 1000Hz. The zero-distance loudness of the headphone is between 60dB and 90dB, and the 1m close distance loudness is between 30dB and 40dB.The experimental results confirmed that the headphone can meet the hearing needs without healthy risk and ambient noise.

scholarly journals Evaluation of the influence of friction in a multi-leaf spring on the working conditions of a truck driver

2021 ◽  
Vol 23 (3) ◽  
pp. 422-429
Author(s):  
Zdzisław Hryciów ◽  
Wiesław Krasoń ◽  
Józef Wysocki
Keyword(s):  
Vibration Isolation ◽  
Vertical Direction ◽  
Leaf Spring ◽  
Element Analysis ◽  
Isolation System ◽  
Friction Forces ◽  
Front Suspension ◽  
The Road ◽  
Variable Friction ◽  
Energy Dissipated

This article presents a simulation study of the suspension system in a vehicle that weighs approximately 12 tons (class N2). The authors have tested the influence of experimentally determined values of friction coefficients on the energy dissipated in the multi-leaf spring. The study was carried out using finite element analysis with LS-DYNA software. A nonlinear vibration model of the complete spring was developed, including the variable friction forces between the leafs. The model takes into account the sprung and unsprung mass of the chassis. Numerical tests were carried out using three different coefficients of friction (determined experimentally) for a selected speed of the car. Random realizations of the road micro-profile (type A, B, C) recommended by ISO 8608 were used. The results of the tests were presented in the form of acceleration curves in the vertical direction, comparative plots of daily vibration exposure A(8) and vibration transmission coefficient (T), and the distributions of RMS acceleration in frequency of one-third octave bands. This data was used to assess the quality of the vibration isolation system between the front suspension of the vehicle and the driver’s seat.

An hourglass-type electromagnetic isolator with negative resistance electromagnetic shunt circuit

2020 ◽  
Vol 64 (1-4) ◽  
pp. 549-556
Author(s):  
Yajun Luo ◽  
Linwei Ji ◽  
Yahong Zhang ◽  
Minglong Xu ◽  
Xinong Zhang
Keyword(s):  
Vibration Isolation ◽  
Electromechanical Coupling ◽  
Coupling Effect ◽  
Negative Resistance ◽  
Isolation System ◽  
Amplitude Vibration ◽  
Vibration Responses ◽  
The Stability ◽  
Isolation Performance ◽  
Shunt Circuit

The present work proposed an hourglass-type electromagnetic isolator with negative resistance (NR) shunt circuit to achieve the effective suppression of the micro-amplitude vibration response in various advanced instruments and equipment. By innovatively design of combining the displacement amplifier and the NR electromagnetic shunt circuit, the current new type of vibration isolator not only can effectively solve the problem of micro-amplitude vibration control, but also has significant electromechanical coupling effect, to obtain excellent vibration isolation performance. The design of the isolator and motion relationship is presented firstly. The electromechanical coupling dynamic model of the isolator is also given. Moreover, the optimal design of the NR electromagnetic shunt circuit and the stability analysis of the vibration isolation system are carried out. Finally, the simulation results about the transfer function and vibration responses demonstrated that the isolator has a significant isolation performance.

A high-fidelity dynamic model for the Active Rack Isolation System

1998 ◽  
Author(s):  
R. Hampton ◽  
Nagendra Subba Rao ◽  
Young Kim ◽  
William Wagar ◽  
Allen Karchmer
Keyword(s):  
Dynamic Model ◽  
High Fidelity ◽  
Isolation System

Isolation Performance of Intelligent Seismic Isolation System Using Air Bearing

2009 ◽  
Author(s):  
Satoshi Fujita ◽  
Keisuke Minagawa ◽  
Mitsuru Miyazaki ◽  
Go Tanaka ◽  
Toshio Omi ◽  
...  
Keyword(s):  
Seismic Isolation ◽  
Seismic Waves ◽  
Three Dimensional ◽  
Vertical Motion ◽  
Air Bearings ◽  
Natural Period ◽  
Isolation System ◽  
Vertical Excitation ◽  
Long Period ◽  
Isolation Performance

This paper describes three-dimensional isolation performance of seismic isolation system using air bearings. Long period seismic waves having predominant period of from a few seconds to a few ten seconds have recently been observed in various earthquakes. Also resonances of high-rise buildings and sloshing of petroleum tanks in consequence of long period seismic waves have been reported. Therefore the isolation systems having very long natural period or no natural period are required. In a previous paper [1], we proposed an isolation system having no natural period by using air bearings. Additionally we have already reported an introduction of the system, and have investigated horizontal motion during earthquake in the previous paper. It was confirmed by horizontal vibration experiment and simulation in the previous paper that the proposed system had good performance of isolation. However vertical motion should be investigated, because vertical motion varies horizontal frictional force. Therefore this paper describes investigation regarding vertical motion of the proposed system by experiment. At first, a vertical excitation test of the system is carried out so as to investigate vertical dynamic property. Then a three-dimensional vibration test using seismic waves is carried out so as to investigate performance of isolation against three-dimensional seismic waves.

Sign in / Sign up

Export Citation Format

Share Document