Dynamic Responses for Viscoelastic Shock Absorbers to Protect a Finger under Impact Force

Yamaguchi, Takao; Fujii, Yusaku; Fukushima, Toru; Kanai, Tomoyuki; Nagai, Kenichi; Maruyama, Shinichi

doi:10.4028/www.scientific.net/AMM.36.287

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HomeApplied Mechanics and MaterialsPrecision Instrumentation and MeasurementDynamic Responses for Viscoelastic Shock Absorbers...

Dynamic Responses for Viscoelastic Shock Absorbers to Protect a Finger under Impact Force

Abstract:

This paper deals with dynamic responses of viscoelastic shock absorbers to protect a finger under impact forces by a sliding rigid object. The outline of the viscoelastic absorber is tube and the cross section of the absorber is in the shape of hollow semi circle. The sliding object having initial velocities collided with the absorbers. And the relevant restoring forces are measured using Levitation Mass Method proposed by Fujii. In this paper, we carry out numerical analysis of dynamic response for the viscoelastic absorbers under the same conditions with the experiment using LMM. The absorbers are modeled using a nonlinear concentrated spring with nonlinear hysteresis. This nonlinear spring is connected to the levitated block, which is modeled by three-dimensional finite elements. The experimental data are compared with the calculated ones using our proposed FEM.

Info:

Periodical:

Applied Mechanics and Materials (Volume 36)

Main Theme:

Precision Instrumentation and Measurement

Edited by:

Yusaku Fuji and Koichi Maru

Pages:

287-292

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.36.287

Citation:

T. Yamaguchi et al., "Dynamic Responses for Viscoelastic Shock Absorbers to Protect a Finger under Impact Force", Applied Mechanics and Materials, Vol. 36, pp. 287-292, 2010

Online since:

October 2010

Authors:

Takao Yamaguchi, Yusaku Fujii, Toru Fukushima, Tomoyuki Kanai, Kenichi Nagai, Shinichi Maruyama

Keywords:

Finite Element Model (FEM), Modeling, Nonlinear Vibration, Simulation, Viscoelastic Material

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References

[1] T. Yamaguchi, Y. Fujii, K. Nagai and S. Maruyama, Mechanical Systems and Signal Processing, Vol. 20 (2006), p. (1905).

[2] Y. Fujii and T. Yamaguchi, Review of Scientific Instruments, Vol. 75-1(2004), p.119.

[3] T. Yamaguchi and Y. Fujii, Dynamic analysis by FEM for a measurement system to observe viscoelasticity using levitation mass method, International Journal of Advanced Manufacturing Technology, Vol. 46-9 (2010), p.885.

DOI: https://doi.org/10.1007/s00170-009-2010-2

Paper TitlePages

Development of Mass Measurement Devices for Zero-Gravity Experiments

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Research on Frequency-Tuned Dynamic Vibration Absorber

Authors: Shi Liang Jiang, Tie Jun Yang, Jing Tao Du, Yin Yin Hu

Abstract: A frequency-tuned dynamic vibration absorber by tuning stiffness to reduce vibration at some troubled resonance frequencies of a simply supported beam structure is designed in this paper. Both theoretical and simulation analysis of vibration absorption are conducted. On the basis of analyzing bending vibration of the simply supported beam structure, inherent characteristics and frequency response characteristics of the simply supported beam system before and after being fixed dynamic vibration absorber are obtained by using the energy method with Rayleigh-Ritz procedure of flexible structure. Simulation model of the whole system, which is established by code written, is compared with the model established by finite element analysis software. Results are presented to show the efficiency of the vibration absorber, and then the effect of damping of the dynamic vibration absorber on vibration absorption is studied.

1762

Study on Design Method of Magneto-Rheological Fluid Shock Absorber Employing Shear Rate Profiles and Experimental Tests

Authors: Chang Rong Liao, J.H. Hao, D.X. Zhao, K.L. Wang

Abstract: The flow differential equation for Magneto-rheological (MR) fluids in annular channels of MR fluid shock absorber is set up and several rational simplifications are made. Analytical shear stress profiles of MR fluids through annular channels are obtained via solution of the flow differential equation. An analytical study on MR fluid shock absorber is present employing shear stress profiles. Both boundary conditions and compatible conditions are established. Both flow velocity profiles and total volumetric flow rate are developed by integration by parts and numerical integration. The prediction method for damping force of MR fluid shock absorber is developed via simultaneous equations. The analytical study on MR fluid shock absorber is validated by means of reformative Herschel–Bulkley constitutive model, in which flow velocity profiles and flow regions boundary radii are drawed. A MR fluid shock absorber, which is designed and fabricated in Chongqing University, is tested by electro-hydraulic servo vibrator in National Center for Test and Supervision of Coach Quality. The experimental results reveal that the methodology is able to predict damping force of MR fluid shock absorber via shear rate profiles and experimental damping forces are in good agreement with analytical those.

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Active Control of Nonlinear Vibration Absorber Based on Synovial Algorithm

Authors: Zhi Xing Li, Li Hua Yang, Qing Chao Yang

Abstract: In this paper, the dynamic characteristics of Duffing strong nonlinear vibration absorber system with additional hard spring is analysed qualitatively. Based on synovial variable structure algorithm, the active control system model of the nonlinear dynamic vibration absorber is designed, and the effectiveness of the control model is verified by elevant examples. It’s found that with the additional hard spring Duffing strong nonlinear vibration absorber, the control effect of active absorption is superior to the passive absorber, so which has has important guiding significance to the design of actual engineering nonlinear vibration absorber.

Impact Response Measurement of Contact Lenses

Authors: Kazuhide Watanabe, Naoki Miyashita, Du Hong Bin, Kyohei Irisa, Akihiro Takita, Takao Yamaguchi, Edwin Carcasona, Somsak Mitatha, Yusaku Fujii

Abstract: Impact response of contact lenses is measured using the Levitation Mass Method (LMM). In the LMM, a small mass collides with contact lenses and the impact force is measured with high accuracy as the inertial force of the moving part. A pneumatic linear bearing is used to achieve linear motion with sufficiently small friction acting on the moving part. Hysteresis loop and consumed energy as mechanical characteristics of contact lenses are also calculated.

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