Software for Correcting the Dynamic Error of Force Transducers

Abstract

Software which corrects the dynamic error of force transducers in impact force measurements using their own output signal has been developed. The software corrects the output waveform of the transducers using the output waveform itself, estimates its uncertainty and displays the results. In the experiment, the dynamic error of three transducers of the same model are evaluated using the Levitation Mass Method (LMM), in which the impact forces applied to the transducers are accurately determined as the inertial force of the moving part of the aerostatic linear bearing. The parameters for correcting the dynamic error are determined from the results of one set of impact measurements of one transducer. Then, the validity of the obtained parameters is evaluated using the results of the other sets of measurements of all the three transducers. The uncertainties in the uncorrected force and those in the corrected force are also estimated. If manufacturers determine the correction parameters for each model using the proposed method, and provide the software with the parameters corresponding to each model, then users can obtain the waveform corrected against dynamic error and its uncertainty. The present status and the future prospects of the developed software are discussed in this paper.

Effect of Mass Added to a Force Transducer on the Dynamic-Force Correction Method

“…the effective mass and the effective spring constant, and the dynamic-error could be corrected with the calculated DCC. In the future, we will add this DCC calculation function to the software we made [6] so that every user can easily correct the dynamic error in the dynamic force measurement with the force transducer.…”

“…We also confirmed that the acceleration at the sensing part of the transducer is almost proportional to the second-order differential of the output signal of the transducer. Therefore, the dynamic error is then proved to be corrected using the output signal of the transducer itself [5] and we develop a software for correcting the dynamic error of a force transducer in a dynamic force measurement [6] so that every user of the transducer can correct their measurement result against to the dynamic error easily. By using the software, once a dynamic correction coefficient (DCC) is measured by the LMM and is opened to the public, users can correct the dynamic error without the LMM setup.…”

Research on dynamic calibration and compensation method of strain-gauge type force sensor

“…In practical engineering applications, it is common for the force measurement system to take the characteristic parameters obtained by static calibration as the reference basis for dynamic measurement. Practical experience shows that even the force measurement system with high accuracy in static calibration will produce large dynamic error in the process of dynamic measurement (Miyashita et al , 2014). The dynamic error is mainly caused by the poor dynamic performance of the measurement system.…”

Frictional Characteristics of a Small Aerostatic Linear Bearing

“…In the LMM, the inertial force of a mass levitated using an aerostatic linear bearing is used as the accurately-measurable force. The LMM has been applied for precision force measurements, such as dynamic calibration of force transducers [6][7][8] and material testers without use of force transducers [9,10]. The results of these studies seem to be precise enough; however, there are some ambiguous points concerning the force acting on the moving part of an aerostatic linear bearing and there are few studies on the problem.…”