Constant amplitude dynamic force calibration

The accuracy between a dynamic force and a static force applied on a specimen by a fatigue machine is usually not the same. By establishing physical vibration models of fatigue machines, it is concluded that the error of a cyclic force is mainly caused by the inertial force of the vibration mass between the machine sensor and the specimen. After the inertial force is exactly corrected, the force displayed on the machine would be consistent with the real force on the specimen. A standard dynamic force calibration sensor (DFCS) with an inertial force correction method has been used to do calibration of fatigue testing machines in this paper. Compared with the replica test-piece method, the two calibration results are close to each other.

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Magnetic fields influence on sensors with electrical output under sinusoidal excitations

ACTA IMEKO ◽

10.21014/acta_imeko.v5i1.301 ◽

2016 ◽

Vol 5 (1) ◽

pp. 51 ◽

Cited By ~ 1

Author(s):

Nieves Medina ◽

Jesús De Vicente ◽

Jorge Robles

Keyword(s):

Magnetic Fields ◽

Primary Standard ◽

Dynamic Force ◽

Magnetic Effects ◽

Force Transducers ◽

Electrodynamic Shaker ◽

Force Calibration ◽

Electrical Output

This paper describes the magnetic effects studied at CEM in their realization of a primary standard for dynamic force calibration using sinusoidal excitations of force transducers, although they can also affect any sensor with an electrical output mounted on an electrodynamic shaker. In this study the electromagnetic behaviour for the interaction between sensor and shaker or a similar source of magnetic fields is explained and a solution to minimise this interaction is also included.

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