From oscillation to impact: the design of a new force calibration device at PTB

Bruns, Th; Kumme, Rolf; Kobusch, Michael; Peters, M.

doi:10.1016/s0263-2241(01)00048-3

Cited by 40 publications

(22 citation statements)

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“…The maximum weight of the moving part is approximately 30 kg, the thickness of the air film is approximately 8 µm, the stiffness of the air film is more than 70 N/µm, and the straightness of the guideway is better than 0.3 µm/100 mm. The frictional characteristics are determined in detail by means of the developed method (7) . Measurements using the two electric counters are triggered by means of a sharp trigger signal generated using a digital to analog converter.…”

Section: Methodsmentioning

confidence: 99%

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Dynamic Characteristics Measurements of a Car Wiper Blade

Fujii

Yamaguchi²

2006

JSME Int. J., Ser. C

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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.

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Section: Methodsmentioning

confidence: 99%

“…Bruns have also started to develop a similar method (7) . This method was first pro-posed (1) as an impulse response evaluation method for force transducers; a mass is made to collide with a force transducer and the impulse, i.e., the time integration of the impact force, is measured highly accurately as a change in momentum of the mass.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Characteristics Measurements of a Car Wiper Blade

Fujii

Yamaguchi²

2006

JSME Int. J., Ser. C

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“…These attempts can be divided into three categories: methods of calibrating transducers against an impact force [9,10], methods of calibrating transducers against a step force [11] and methods of calibrating transducers against an oscillation force [12][13][14][15]. However, it is not yet known how the results of such dynamic calibration are to be applied to the actual wave profile of a varying force.…”

Section: Introductionmentioning

confidence: 99%

Impact force measurement of an actuator arm of a hard disk drive

Fujii¹,

Shu²

2008

International Journal of Impact Engineering

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“…Some methods are now being developed. [5][6][7][8][9][10][11][12] In other words, this fact means that both the uncertainty evaluation for the measured value of the small force and the uncertainty evaluation for the time of the measurement are very difficult.…”

Section: Introductionmentioning

confidence: 99%

“…Although the methods of dynamic calibra-tion of force transducers are not yet well established, there have been a number of trials aiming at establishing the dynamic calibration methods for force transducers. The dynamic calibration methods can be divided into three categories: methods for calibrating force transducers using an impact force, [5][6][7] methods for calibrating force transducers using a step force, 8 and methods for calibrating force transducers using an oscillation force. [9][10][11][12] The author has proposed methods for all three categories.…”

Section: Introductionmentioning

confidence: 99%

Microforce materials tester

Fujii

2005

Review of Scientific Instruments

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A material tester for evaluating the mechanical response of general objects against micro-Newton level impact forces has been proposed. In the tester, an inertial mass is made to collide with the material under test. The impact force acting on the material is measured as the inertial force of the mass. A pneumatic linear bearing is used to realize linear motion with small friction acting on the mass that is the moving part of the bearing. The velocity of the mass is measured highly accurately by means of an optical interferometer. The acceleration, the inertial force, and the position of the mass is numerically calculated from the velocity after the collision measurement. The other force, which is mainly consisted of the friction acting inside the bearing, is determined using the same instrumentations. Using the estimated friction inside the bearing, the measured force is corrected. The force acting on the mass from the material under test of approximately 0.1 mN is measured with the standard uncertainty of approximately 1.4 N.

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From oscillation to impact: the design of a new force calibration device at PTB

Cited by 40 publications

References 1 publication

Dynamic Characteristics Measurements of a Car Wiper Blade

Dynamic Characteristics Measurements of a Car Wiper Blade

Impact force measurement of an actuator arm of a hard disk drive

Microforce materials tester

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