Dynamic force measurement

1995 ◽  
pp. 55-80 ◽  
Author(s):  
M. J. Dixon
Keyword(s):  
Force Measurement ◽  
Dynamic Force

Dynamic Force Measurement of Model Container to Centrifuge Nacelle Used in Centrifuge Model Explosion Test

2010 ◽  
Vol 439-440 ◽  
pp. 1393-1397
Author(s):  
Xiao Hong Yue ◽  
Yong Jian Mao ◽  
Hao Pu ◽  
Bao Liang Niu ◽  
Lei Wang ◽  
...  
Keyword(s):  
Force Measurement ◽  
Low Cost ◽  
Dynamic Environment ◽  
Dynamic Strain ◽  
Centrifuge Model Test ◽  
Dynamic Force ◽  
Geotechnical Centrifuge ◽  
Centrifuge Model ◽  
Explosion Test ◽  
Compressive Tests

The technique of centrifuge model test has been widely used in geotechnical mechanics and engineering because of its low cost and low test scale. In order to investigate the dynamic behaviors of the geotechnical model under explosion, we are developing an explosion geotechnical centrifuge. The dynamic environment of explosion is necessary to be determined for the strength design of the centrifuge nacelle. This paper presents the dynamic force measurement of the model container to the centrifuge nacelle under a typical explosion. Firstly, three cylindrical supports were designed and calibrated by quasi-static compressive tests. The force-strain relations are measured and linearly fitted. Secondly, an explosion test was performed and the dynamic strain histories of the supports were measured. Then the dynamic force histories were obtained combined with the calibration results. The investigation provides an understanding of the dynamic environment for the centrifuge nacelle design.

Dynamic Force Measurement with Strain Gauges

1974 ◽  
Vol 42 (2) ◽  
pp. 108-110
Author(s):  
Bruce E. Lee
Keyword(s):  
Force Measurement ◽  
Strain Gauges ◽  
Dynamic Force

Metal Forming With Vibrated Tools

1969 ◽  
Vol 91 (4) ◽  
pp. 1168-1174 ◽  
Author(s):  
Ivan Kristoffy
Keyword(s):  
Metal Forming ◽  
Necessary Conditions ◽  
Force Measurement ◽  
Cold Forging ◽  
Dynamic Force ◽  
Forming Force ◽  
Continuous Forming ◽  
Tool Vibration ◽  
State Of Stress ◽  
Force Reduction

The results of superimposed 20- and 20,000-cps tool vibration in deep drawing, ironing, and cold-forging are presented. Equipment and instrumentation are discussed. The importance of proper dynamic force measurement is emphasized. It was found that: (a) punch vibration resulted in only an apparent force reduction proportional to the workpiece stiffness and vibration amplitude; (b) die vibration caused a true forming force reduction either by changing the direction of friction force or by altering the state of stress; (c) material properties were not affected, although in cold-forging, with superimposed 20,000 cps punch vibration, an apparent force drop of up to 60 percent was achieved; (d) surface finish and deep drawability of the material, under certain conditions, were slightly improved. It is recommended to use superimposed tool vibration only in continuous forming operations, and then only if certain necessary conditions can be satisfied.

New Giant Magnetostrictive Force Sensors

2013 ◽  
Vol 816-817 ◽  
pp. 424-428
Author(s):  
Rong Ge Yan ◽  
Li Hua Zhu ◽  
Qing Xin Yang
Keyword(s):  
Force Measurement ◽  
Force Sensor ◽  
Measurement Range ◽  
Magnetic Flux Density ◽  
Force Sensors ◽  
Dynamic Force ◽  
Element Analysis ◽  
Giant Magnetostrictive Materials ◽  
Overload Capacity ◽  
Adjustable Range

Force sensors, based on the giant inverse magnetostrictive effect, have a series of outstanding properties, such as large overload capacity, which make them have more and more applications to the field of automatic control system of heavy industry, chemical industry. This paper designs new giant magnetostrictive force sensors using the rare-earth iron giant magnetostrictive materials. With the designed giant magnetostrictive force sensor, the relations between magnetic flux density in the gap and applied static stress on the sensor, the inductive voltage in the coil and time (with the dynamic stress), are calculated by finite element analysis software. The related confirmatory experiments have been conducted. The experimental results indicate that the giant magnetostrictive force sensor is fit for static and dynamic force measurement. In order to enlarge the measurement range, the designed force sensor as the basic cell is combined. This paper gives two kinds of combinations, which have the feature of adjustable range.

scholarly journals Fluid-Dynamic Force Measurement of Ahmed Model in Steady-State Cornering

Energies ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 6592
Author(s):  
Takuji Nakashima ◽  
Hidemi Mutsuda ◽  
Taiga Kanehira ◽  
Makoto Tsubokura
Keyword(s):  
Steady State ◽  
Aerodynamic Drag ◽  
Force Measurement ◽  
Fluid Dynamic ◽  
Fuel Efficiency ◽  
Dynamic Force ◽  
Total Drag ◽  
Automobile Aerodynamics ◽  
Numerical Research ◽  
Good Agreement

The effects of on-road disturbances on the aerodynamic drag are attracting attention in order to accurately evaluate the fuel efficiency of an automobile on a road. The present study investigated the effects of cornering motion on automobile aerodynamics, especially focusing on the aerodynamic drag. Using a towing tank facility, measurements of the fluid-dynamic force acting on Ahmed models during steady-state cornering were conducted in water. The investigation included Ahmed models with slant angles θ = 25° and 35°, reproducing the wake structures of two different types of automobiles. The drag increase due to steady-state cornering motion was experimentally measured, and showed good agreement with previous numerical research, with the measurements conducted at a Reynolds number of 6 × 105, based on the model length. The Ahmed model with θ = 35° showed a greater drag increase due to the steady-state cornering motion than that with θ = 25°, and it reached 15% of the total drag at a corner with a radius that was 10 times the vehicle length. The results indicated that the effect of the cornering motion on the automobile aerodynamics would be more important, depending on the type of automobile and its wake characteristics.

Tire Non-Uniformities And Steering Wheel Vibrations

2005 ◽  
Vol 33 (2) ◽  
pp. 64-102 ◽  
Author(s):  
H. R. Dorfi
Keyword(s):  
Force Measurement ◽  
Rolling Force ◽  
Measurement Data ◽  
Angular Acceleration ◽  
Longitudinal Direction ◽  
Steering System ◽  
Steering Wheel ◽  
Dynamic Force ◽  
Steady State Rolling ◽  
Force Variation

Abstract Steering wheel vibrations are frequently related to non-uniformities of the tire/wheel system. While steering system design is a major factor in the sensitivity of the vehicle, the excitation of steering wheel vibrations is due in general to non-uniformities of the tire/wheel system. However, tire non-uniformities are to some extent unavoidable and result in rolling force variation at the spindle during steady state rolling. Therefore, limiting and managing these non-uniformities is of great economic importance to tire manufacturers. The present work demonstrates the tire's role in generating non-uniformity induced dynamic force variations due to 1st order geometric imperfections. Both analytical and numerical approaches are studied. Numerical experiments of the effects of non-uniformities are investigated with the physics based tire model FTIRE. The effects of tire resonance on the non-uniformity force amplitudes are demonstrated through modeling and simulation. The model is then verified using experimental data and the distribution of geometric non-uniformities is studied in a large tire sample based on force measurement data and the model fit. A MSC.ADAMS model of a light truck is combined with non-uniform FTIRE models to study the effect of geometric non-uniformities on steering wheel vibrations. The simulations show that the angular acceleration of the steering wheel around its steer-axis is primarily dependent on force variations in the longitudinal direction (T1H). The effects of phasing, increase in inertia and tire position on the steering wheel vibrations are also discussed.

Sign in / Sign up

Export Citation Format

Share Document