Design of Linear Damper in Calibration Device for Dynamic Force

2013 ◽  
Vol 765-767 ◽  
pp. 2329-2332 ◽  
Author(s):  
Wei Dong Xie ◽  
Hao Liang Lv ◽  
Ji Sheng Shen
Keyword(s):  
Force Transducer ◽  
Dynamic Calibration ◽  
Dynamic Force ◽  
Damping Force ◽  
Core Member ◽  
Theoretical Premise ◽  
Calibration Device ◽  
Working Principle

The force transducer for dynamic calibration in absorber dynamometer is usually statically calibrated. To solve the problem, a new kind of dynamic calibration device and its working principle is discussed. Furthermore , the principle of its core member, linear damper, is particularly analyzed. Moreover dampers in different structures are discussed in depth and the production of its damping force is deduced. Thus, the theoretical premise of dynamic calibration device and linear damper is provided in this essay.

A Bidirectional-Controllable Magnetorheological Energy Absorber for Shock and Vibration Isolation Systems

2012 ◽  
Author(s):  
Xian-Xu Bai ◽  
Norman M. Wereley ◽  
Wei Hu ◽  
Dai-Hua Wang
Keyword(s):  
Mechanical Model ◽  
Vibration Isolation ◽  
Dynamic Force ◽  
Damping Force ◽  
Isolation System ◽  
Isolation Systems ◽  
Force Range ◽  
Fail Safe ◽  
Safe Performance ◽  
Vibration Isolation Performance

Semi-active shock and vibration isolation systems using magnetorheological energy absorbers (MREAs) require minimization of the field-off damping force at high speed. This is because the viscous damping force for high shaft speed become excessive. This implies that the controllable dynamic force range, defined as the ratio of the field-on damping force to the field-off damping force, is dramatically reduced. In addition, fail-safe MREA performance, if power were to be lost, is of great importance to shock and vibration isolation systems. A key design goal is to minimize field-off damping force while maximizing MREA dynamic force, while maintaining fail-safe performance. This study presents the principle of a bidirectional-controllable MREA that can produce large damping force and dynamic force range, as well as excellent fail-safe performance. The bidirectional-controllable MREA is configured and its hydro-mechanical model is theoretically constructed. From the hydro-mechanical model, the mathematical model for the MREA is established using a Bingham-plastic nonlinear fluid model. The characteristics of the MREA are theoretically evaluated and compared with those of a conventional flow-mode MREA with an identical volume. In order to investigate the feasibility and capability of the bidirectional-controllable MREA in the context of the semi-active shock and vibration isolation systems, a mechanical model of a single-degree-of-freedom (SDOF) isolation system using a bidirectional-controllable MREA is constructed and the governing equation for the SDOF isolation system is derived. A skyhook control algorithm is utilized to improve the shock and vibration isolation performance of the isolation systems. Simulated vibration isolation performance using bidirectional-controllable and conventional MREAs under shock loads due to vertical impulses (the initial velocity is as high as 10 m/s), and sinusoidal vibrations, are evaluated, compared, and analyzed.

Effect of Mass Added to a Force Transducer on the Dynamic-Force Correction Method

2019 ◽  
Vol 888 ◽  
pp. 72-77
Author(s):  
Akihiro Takita ◽  
Taku Iwashita ◽  
Yusaku Fujii
Keyword(s):  
Effective Mass ◽  
Dynamic Error ◽  
Force Transducer ◽  
Spring Constant ◽  
Experimental Result ◽  
Correction Coefficient ◽  
Dynamic Force ◽  
Additional Mass ◽  
Dynamic Correction ◽  
Effective Spring Constant

Dynamic-error caused by the mass attached to the sensing part of a force transducer is experimentally investigated using the Levitation Mass Method (LMM), in which the dynamic-force applied to the force transducer is measured based on the definition of force, i.e. the product of mass and acceleration. It is experimentally proved that the change in the dynamic correction coefficient (DCC) is proportional to the additional mass as expected by the theory. The effective mass and the effective spring constant of the transducer with the additional mass are estimated from the experimental result. It is experimentally proved that the DCC for the transducer with the additional mass can be calculated using the estimated properties, i.e. the effective mass and the effective spring constant, and the dynamic-error can be corrected with the calculated DCC.

scholarly journals Dynamic Force Transducer Calibration Based on Electrostatic Force

IEEE Access ◽  
2019 ◽  
Vol 7 ◽  
pp. 48998-49003 ◽  
Author(s):  
Yelong Zheng ◽  
Meirong Zhao ◽  
Jile Jiang ◽  
Le Song
Keyword(s):  
Electrostatic Force ◽  
Force Transducer ◽  
Dynamic Force ◽  
Transducer Calibration

A traceable dynamic force transducer

1990 ◽  
Vol 30 (2) ◽  
pp. 152-157 ◽  
Author(s):  
Michael J. Dixon
Keyword(s):  
Force Transducer ◽  
Dynamic Force

Dynamic Force Coefficients of Hydrostatic Gas Films for Recessed Flat Plates: Experimental Identification and Numerical Predictions

2018 ◽  
Vol 140 (6) ◽  
Author(s):  
Adolfo Delgado ◽  
Bugra Ertas
Keyword(s):  
Film Thickness ◽  
Pressure Ratio ◽  
Experimental Results ◽  
Dynamic Force ◽  
Test Rig ◽  
Flat Plates ◽  
Damping Force ◽  
Force Coefficients ◽  
Numerical Predictions ◽  
Stiffness And Damping

The following paper focuses on an experimental and analytical study aimed at identifying the dynamic force coefficients of hydrostatic gas films for recessed flat plates. The motivation for the effort was brought upon by the necessity of generating more accurate models for hydrostatic gas films found in hybrid gas bearings. Pressurized air at room temperature up to 120 psi was used to test different recess geometries on a flat plate test rig, capable of characterizing the stiffness and damping force coefficients for varying supply pressures, gas film thickness values, excitation frequencies, and vibration amplitudes. The test rig design and operation is described. Experimental results include frequency-dependent stiffness and damping coefficients, and leakage. The test results show that using external pressurization can generate large stiffness values while exhibiting small leakage. However, the results also show that the majority of the test configurations portray high negative damping values. An analytical model is presented and numerical predictions are compared to experimental results. Example damping trends as a function of frequency, pressure, and film thickness are presented in addition to force coefficient plots as functions of pressure ratio.

Study on Nonlinear Vibration Characteristics of Damping-Adjustable Hydro-Pneumatic Suspension

2010 ◽  
Vol 108-111 ◽  
pp. 1027-1032
Author(s):  
Bao Zhan Lü ◽  
Hong Xia Fu ◽  
Si Hong Zhu
Keyword(s):  
Nonlinear Vibration ◽  
Nonlinear Dynamic ◽  
Dynamic Stiffness ◽  
Vibration Characteristics ◽  
Damping Force ◽  
Output Force ◽  
Pneumatic Suspension ◽  
New Type ◽  
Working Principle ◽  
Set Up

Based on the investigation on vibration characteristics of certain off-road vehicle, a new type of damping-adjustable hydro-pneumatic suspension was put forward. After the analysis of its working principle, the nonlinear dynamic mathematical models of this suspension were set up. Using the method of theoretical calculation and simulation by MATLAB/Simulink, the nonlinear vibration characteristics of this damping- adjustable hydro-pneumatic suspension were studied, including static and dynamic stiffness, dynamic output force and damping force.

scholarly journals In-situ dynamic force calibration using impact hammers

ACTA IMEKO ◽  
2020 ◽  
Vol 9 (5) ◽  
pp. 118
Author(s):  
M. Kobusch ◽  
L. Klaus
Keyword(s):  
Transfer Functions ◽  
Force Measurement ◽  
Measurement Data ◽  
Calibration Method ◽  
Force Transducer ◽  
Experimental Investigations ◽  
Dynamic Force ◽  
In Situ Calibration ◽  
Force Calibration

This paper presents experimental investigations of in-situ dynamic force calibrations in which an impact hammer provides the dynamic reference force. Here, the force transducer to be calibrated remains in the original mechanical structure of the force measurement application to which calibration shock forces are applied in a suitable way. Numerous experiments with different force transducer set-ups and different impact hammer configurations were conducted to validate this in- situ calibration method. The paper describes the analysis of the measurement data and presents the force transfer functions obtained. Finally, these dynamic calibration results are discussed.

scholarly journals A case study in model-based dynamic calibration of small strain gauge force transducers

ACTA IMEKO ◽  
2017 ◽  
Vol 6 (1) ◽  
pp. 3 ◽  
Author(s):  
Michael Kobusch ◽  
Sascha Eichstädt
Keyword(s):  
Strain Gauge ◽  
Small Strain ◽  
Force Transducer ◽  
Dynamic Calibration ◽  
Model Based ◽  
Proposed Model ◽  
Calibration Methods ◽  
High Bandwidth ◽  
Set Up ◽  
Improved Model

<p class="Abstract">Investigations of the model-based dynamic calibration of a small strain gauge force transducer of high bandwidth revealed new challenges for parameter identification. This paper discusses a more generalized mechanical model of the calibration set-up employed taking account of the transducer’s connection to its mechanical environment at both ends. Based on new experimental sine and shock force data, the improved model is studied and its parameters are identified. It is shown that the proposed model is capable of linking the calibration results of both calibration methods to a much better degree. This paper is an extended version of the original contribution to the IMEKO 2015 conference in Prague, Czech Republic.</p>

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