Dynamic investigation of a three-component force-moment sensor

Review of Scientific Instruments

Yamaguchi

2004

A method for evaluating the viscoelasticity of materials under oscillation load is proposed. In the method, a material under test is connected to a mass, which generates an oscillating inertial force after the mass is manually struck using a hammer. A pneumatic linear bearing is used to realize linear motion with sufficiently small friction acting on the mass that is the moving part of the bearing. The inertial force acting on the mass is determined highly accurately by means of measuring the velocity of the mass using an optical interferometer.

Section: Fϭm Amentioning

confidence: 99%

Method for evaluating material viscoelasticity

Review of Scientific Instruments

Yamaguchi

2004

“…[1][2][3][4][5][6][7] These attempts can be divided into three categories: methods for calibrating transducers using an impact force, 1,2 methods for calibrating transducers against a step force, 3 and methods for calibrating transducers against an oscillation force. [4][5][6][7] The author has proposed a method, the levitation mass method. In the method, the inertial force of a mass levitated using a pneumatic linear bearing is used as the reference force applied to the objects under test, such as force transducers, materials, or structures.…”

Section: Introductionmentioning

confidence: 99%

Pendulum for precision force measurement

Review of Scientific Instruments

2006

A pendulum and a method for correcting the restoring force of the pendulum are proposed for realizing an instrument based on the levitation mass method without the use of pneumatic linear bearings. As an example a material tester using the pendulum, which evaluates the mechanical response of general objects against impact forces, is developed. The characteristics of the restoring force are accurately determined using the same instrument under the free-swing condition without the object under test. To demonstrate the high performance of the developed instrument, the impact response of a gel block is accurately determined. The possible applications of the developed method are discussed.

“…This method will be effective for evaluating the characteristics of force transducers under the conditions in which calibration is conducted, such as continuous vibration at a single frequency. Park et al use this method for dynamic investigation of multicomponent force-moment sensors (11), (12) . In this paper, a novel instrumentation, which is capable for determining both the viscoelasticity under impact load and the dynamical friction based on the definition of force, is described.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Characteristics Measurements of a Car Wiper Blade

Yamaguchi²

2006

JSME Int. J., Ser. C

Dynamic characteristics of a rubber car wiper blade, that are the viscoelasticity under impact load and the dynamical friction, have been accurately evaluated by means of an optical method. In the method, force is generated and measured as the inertial force acing on a mass. A linear air bearing is used to realize a linear motion with sufficiently small friction acting on the mass, i.e. the moving part of the linear bearing. The inertial force acting on the mass is calculated from the velocity of the mass. The velocity is determined highly accurately by means of measuring the Doppler shift of the frequency of the laser light beam reflecting on the mass using an optical interferometer. The viscoelasticity of the wiper blade under impact load is determined by means of colliding the mass with it. The kinetic friction acting between the wiper blade and glass plate is determined by means of pressing the wiper blade onto the glass plate attached on the upper surface of the mass, whose initial momentum is given manually. Using the developed instrumentation, both the viscoelasticity under impact load and the dynamical friction of the wiper blade are easily and accurately determined based on the definition of force.