A method for calibrating force transducers against oscillation force

Review of Scientific Instruments

2007

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A method of generating and measuring static small forces at the micro-Newton level is proposed. In the method, the down-slope component of gravity acting on a mass on an inclined plane is used as a static force. To realize a linear motion of the mass with a small friction, an aerostatic linear bearing is used. The forces acting on the mass, such as the down-slope component of gravity and the dynamic frictional force, are determined by the levitation mass method. In an experiment, a static small force of approximately 183 N is generated and measured with a standard uncertainty of approximately 2 N.

Section: ͑1͒ No Methods Of Measuring Micro-newton Level Forcesmentioning

confidence: 99%

Method of generating and measuring static small force using down-slope component of gravity

Review of Scientific Instruments

2007

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“…The author also proposed a method for calibrating force transducers under oscillation force by means of modifying the previous method using the mass levitation and the optical interferometer. 11 In this article, a method for evaluating the viscoelasticity of materials is proposed. Figure 1 shows a schematic diagram of the experimental setup for evaluating the viscoelasticity of materials.…”

Section: Fϭm Amentioning

confidence: 99%

Method for evaluating material viscoelasticity

Review of Scientific Instruments

Yamaguchi

2004

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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.

“…The inertial force of the levitated mass is measured using an optical interferometer. The first author modified it as the calibration methods for all three categories of dynamic force: impactforce calibration, 11) oscillation-force calibration, 12) and step-force calibration.…”

Section: Introductionmentioning

confidence: 99%

The Space Scale: An Instrument for Astronaut Mass Measurement

Trans. Japan Soc. Aero. S Sci.

Shimada

2008

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A practical, high-precision method for measuring the mass of an astronaut under microgravity conditions is proposed. Using an instrument called the ''Space Scale'', the velocities of a target object and a reference mass are measured with high accuracy by optical interferometry. The two are connected by a linear ball bearing and have separate linearmotion states, with some acceleration due to friction in the linear ball bearing. For this paper, a ground instrument was developed in which linear motion of the whole mechanical system is achieved with negligible external force by means of a pneumatic linear bearing. The effect of linear ball bearing friction that involves the target object and the reference mass is theoretically negligible, as we proved experimentally in this study. We conclude that an operational model for in-orbit use, which takes advantage of an optical interferometer, would be extremely compact and accurate.