Investigation of the comparison method for the dynamic calibration of force transducers

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: Methodsmentioning

confidence: 99%

Section: Fϭm Amentioning

confidence: 99%

Method for evaluating material viscoelasticity

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

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.

“…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%

“…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. 5,6,8,12 In the methods, the inertial force of a mass levitated using a pneumatic linear bearing is used as the reference force applied to the force transducers.…”

Section: Introductionmentioning

confidence: 99%

Microforce materials tester

2005

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.