The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform

Yusaku Fujii - One of the best experts on this subject based on the ideXlab platform.

  • Effect of Mass Added to a Force Transducer on the Dynamic-Force Correction Method
    Applied Mechanics and Materials, 2019
    Co-Authors: Akihiro Takita, Taku Iwashita, Yusaku Fujii
    Abstract:

    Dynamic-error caused by the mass attached to the sensing part of a Force Transducer is experimentally investigated using the Levitation Mass Method (LMM), in which the dynamic-Force applied to the Force Transducer is measured based on the definition of Force, i.e. the product of mass and acceleration. It is experimentally proved that the change in the dynamic correction coefficient (DCC) is proportional to the additional mass as expected by the theory. The effective mass and the effective spring constant of the Transducer with the additional mass are estimated from the experimental result. It is experimentally proved that the DCC for the Transducer with the additional mass can be calculated using the estimated properties, i.e. the effective mass and the effective spring constant, and the dynamic-error can be corrected with the calculated DCC.

  • New technique for dynamic calibration of a Force Transducer using a drop ball tester
    Measurement Science and Technology, 2018
    Co-Authors: Eko Satria, Akihiro Takita, Hadi Nasbey, Irfa Aji Prayogi, H Hendro, Mitra Djamal, Yusaku Fujii
    Abstract:

    A method to calibrate a Force Transducer under dynamic conditions has been developed. Calibration is achieved by a drop ball test based on the levitation mass method using an optical interferometer. From the conducted experiments, the output of the Force Transducer could be corrected, in line with the previous paper written by the authors. Moreover, the dynamic correction coefficient could be obtained by this method, even without an expensive air slider, which was used in our previous method. The calibration performed by the developed method proved to be very significant in correcting the dynamic Force measurement error by the Force Transducer with a very small root mean square (RMS) error compared to the results of measurement in the absence of calibration and dynamic correction. The RMS error of measurement result by the Force Transducer with dynamic calibration and dynamic correction using the developed method is about 1.6 N. This error is equivalent to 1% of the maximum Force applied to the Force Transducer, which is approximately 160 N.

  • DYNAMIC CHARACTERISTICS MEASUREMENTS OF A Force Transducer AGAINST SMALL AND SHORT-DURATION IMPACT ForceS
    Metrology and Measurement Systems, 2014
    Co-Authors: Mitra Djamal, Akihiro Takita, Irfa Aji Prayogi, Kazuhide Watanabe, Kyohei Irisa, Takao Yamaguchi, Yusaku Fujii
    Abstract:

    Abstract A method for evaluating the dynamic characteristics of Force Transducers against small and short-duration impact Forces is developed. In this method, a small mass collides with a Force Transducer and the impact Force is measured with high accuracy as the inertial Force of the mass. A pneumatic linear bearing is used to achieve linear motion with sufficiently small friction acting on the mass, which is the moving part of the bearing. Small and short-duration impact Forces with a maximum impact Force of approximately 5 N and minimum half-value width of approximately 1 ms are applied to a Force Transducer and the impulse responses are evaluated.

  • Review of Dynamic-Force Correction Method for a Force Transducer with the Levitation Mass Method
    The Proceedings of the 1st International Conference on Industrial Application Engineering 2013, 2013
    Co-Authors: Akihiro Takita, Yusaku Fujii
    Abstract:

    In this paper, the measurement and correction method of the dynamic error of a Force Transducer are reviewed. The dynamic Force, an impact load in this paper, is applied to an S-shaped strain-gauge Force Transducer is measured with using the Levitation Mass Method (LMM). In the LMM, the Force acting on the Force Transducer is measured as a reaction Force acting on a moving part of an aerostatic linear bearing which is collided with the Force Transducer. The Force acting on the moving part is measured as an inertial Force of the moving part. Finally, the inertial Force is calculated by the mass and the acceleration of the moving part. As a result of comparing the Forces measured by the Transducer and by the LMM, it is shown that the dynamic error can be estimated by the second time derivative of the output of the Transducer. Therefore, the dynamic error of the Force Transducer can be corrected by using the output data from the Transducer itself, without using the LMM.

  • Correction method for Force Transducers on dynamic condition with or without the Levitation Mass Method (LMM)
    Procedia Engineering, 2012
    Co-Authors: Yusaku Fujii, Akihiro Takita
    Abstract:

    Abstract In this paper, calibration method for Force Transducers on dynamic Force condition with or without the levitation mass method (LMM) is reviewed. At first, a brief review of the LMM is described. Secondly, a correction method for Force Transducer in dynamic Force measurement using the LMM is introduced. Finally, the self-correction method for Force Transducer is shown with results. The most of the dynamic error of an S-shaped strain gauge Transducer is effect of inertial mass of the Transducer. By using the LMM, the relations between the dynamic error and Transducer's output are investigated and a correction parameter is calculated. Without the LMM, the Force measured by the Transducer can be corrected by use of the correction parameter.

Kazunaga Ueda - One of the best experts on this subject based on the ideXlab platform.

  • Performance of a stiffened 50 N Force comparator referring to a tuning-fork Force Transducer
    Measurement, 2018
    Co-Authors: Toshiyuki Hayashi, Kazunaga Ueda
    Abstract:

    Abstract A Force comparator was developed by adopting a highly stable tuning-fork-type Force Transducer with 50 N rated capacity as the reference. Its structure was stiffened to reduce the effects of eccentric Forces and moments caused by the screw of the Force generation mechanism. Strain-gauge-type Force Transducers were evaluated using the comparator and were also calibrated using a dead-weight-type Force standard machine to demonstrate the capability of the comparator. Deviations between the comparator and reference machine results were sufficiently smaller than the measurement uncertainties. At present, major uncertainty components that arose from the evaluated Force Transducer itself degraded the evaluation capability to a relative standard uncertainty of 1.2 × 10−4. If better Force Transducers become available in future, it should be possible to improve the relative standard uncertainty to 6.0 × 10−5.

  • Miniaturization of a 50 N tuning-fork type Force Transducer by adopting a simplified Roberval mechanism
    Measurement, 2017
    Co-Authors: Toshiyuki Hayashi, Kazunaga Ueda
    Abstract:

    Abstract A tuning-fork type Force Transducer of 50 N rated capacity was miniaturized and packed into a cylindrical space 70 mm in diameter and 92 mm in height by adopting a simplified Roberval mechanism. Repeatability and reproducibility of the measured results in different rotational positions of the Transducer were within 2 × 10 −5 relative. The mass of the Force introduction part was reduced, and this enabled the Transducer to be used in an inverted orientation, which is indispensable for the reference Force Transducers built into Force comparators. The new compact Force Transducer was evaluated in its upright orientation by using a dead-weight type Force standard machine and in the inverted orientation by using a Force comparator in which an existing massive tuning-fork type Force Transducer was temporarily adopted as a reference. It was demonstrated that the output of the new Force Transducer in the inverted orientation coincided with that in the upright orientation within a mean deviation of 3 × 10 −5 relative, after applying nonlinearity compensation.

  • Improvement of reproducibility in a calibration of tensile Force Transducers by using low friction rod-end bearings
    2012 Proceedings of SICE Annual Conference (SICE), 2012
    Co-Authors: Toshiyuki Hayashi, Hiroshi Maejima, Kazunaga Ueda
    Abstract:

    Replacement of aged rod-end bearings, a kind of Force introduction jigs, has improved reproducibility in a calibration of tensile Force Transducer with rotating its mounting positions. As oilless rod-end bearings get aged and their sliding bodies accumulate contamination, the bearings increasingly impart eccentric bending moment to the Force Transducer that is connected to the bearings. Increase of the eccentric moment results in deterioration of the reproducibility especially in calibrations of small rated capacity Force Transducer. By replacing the aged rod-end bearings, improvement of the reproducibility has been confirmed in calibrations of three tensile Force Transducers of 50 N, 200 N and 1 kN rated capacities. Improvement by replacement of aged rod-end bearings was effective for Force Transducers with small rated capacities, because they are more sensitive to the certain eccentric Forces and moments than that with large capacities.

  • Automatic rotation equipment for tensile Force Transducers applying to 3 kN dead-weight type Force standard machine
    2011
    Co-Authors: Toshiyuki Hayashi, Yoshihisa Katase, Hiroshi Maejima, Yukio Yamaguchi, Kazunaga Ueda
    Abstract:

    Automatic rotation equipment for tensile Force Transducers has been developed for the 3 kN dead-weight type Force standard machine (DWM). ISO 376, the international standard concerning the calibration method of Force proving instruments, requires measurements at three or more different rotational positions of a Force Transducer. Fully automatic calibration of the Force Transducer would be enabled when the Force Transducer could be automatically rotated. We had already developed automatic rotation equipment for compressive Force Transducers applying to the 3 kN DWM. By newly developing that for tensile Force Transducers, we realized fully automatic calibration of the both compressive and tensile Force Transducers using the 3 kN DWM.

  • evaluation of tuning fork type Force Transducer for use as a transfer standard
    Measurement, 2008
    Co-Authors: Toshiyuki Hayashi, Kazunaga Ueda, Yoshihisa Katase, Tsuyoshi Hoshino, Hiroshi Suzawa, Masaaki Kobayashi
    Abstract:

    Abstract Tuning fork type Force Transducers have potentially better long-term stability than conventional strain gauge types. This is because they directly convert applied Force to resonant frequency, a conversion mechanism which is inherently insensitive to the inherent characteristics of elastic bodies utilized in Force Transducers. A new Force Transducer of 50 N rated capacity has been developed herein, and adopts a double-ended tuning fork (DETF) sensing unit. The performance of two such DETF Force Transducers was evaluated using the 500 N Force standard machine at the National Metrology Institute of Japan (NMIJ). While realizing fine resolutions comparable to those of the conventional strain gauge type Force Transducers, the DETF Force Transducers were found to have low creep, low hysteresis, low temperature coefficient and superior long-term stability.

Toshiyuki Hayashi - One of the best experts on this subject based on the ideXlab platform.

  • Performance of a stiffened 50 N Force comparator referring to a tuning-fork Force Transducer
    Measurement, 2018
    Co-Authors: Toshiyuki Hayashi, Kazunaga Ueda
    Abstract:

    Abstract A Force comparator was developed by adopting a highly stable tuning-fork-type Force Transducer with 50 N rated capacity as the reference. Its structure was stiffened to reduce the effects of eccentric Forces and moments caused by the screw of the Force generation mechanism. Strain-gauge-type Force Transducers were evaluated using the comparator and were also calibrated using a dead-weight-type Force standard machine to demonstrate the capability of the comparator. Deviations between the comparator and reference machine results were sufficiently smaller than the measurement uncertainties. At present, major uncertainty components that arose from the evaluated Force Transducer itself degraded the evaluation capability to a relative standard uncertainty of 1.2 × 10−4. If better Force Transducers become available in future, it should be possible to improve the relative standard uncertainty to 6.0 × 10−5.

  • Miniaturization of a 50 N tuning-fork type Force Transducer by adopting a simplified Roberval mechanism
    Measurement, 2017
    Co-Authors: Toshiyuki Hayashi, Kazunaga Ueda
    Abstract:

    Abstract A tuning-fork type Force Transducer of 50 N rated capacity was miniaturized and packed into a cylindrical space 70 mm in diameter and 92 mm in height by adopting a simplified Roberval mechanism. Repeatability and reproducibility of the measured results in different rotational positions of the Transducer were within 2 × 10 −5 relative. The mass of the Force introduction part was reduced, and this enabled the Transducer to be used in an inverted orientation, which is indispensable for the reference Force Transducers built into Force comparators. The new compact Force Transducer was evaluated in its upright orientation by using a dead-weight type Force standard machine and in the inverted orientation by using a Force comparator in which an existing massive tuning-fork type Force Transducer was temporarily adopted as a reference. It was demonstrated that the output of the new Force Transducer in the inverted orientation coincided with that in the upright orientation within a mean deviation of 3 × 10 −5 relative, after applying nonlinearity compensation.

  • Improvement of reproducibility in a calibration of tensile Force Transducers by using low friction rod-end bearings
    2012 Proceedings of SICE Annual Conference (SICE), 2012
    Co-Authors: Toshiyuki Hayashi, Hiroshi Maejima, Kazunaga Ueda
    Abstract:

    Replacement of aged rod-end bearings, a kind of Force introduction jigs, has improved reproducibility in a calibration of tensile Force Transducer with rotating its mounting positions. As oilless rod-end bearings get aged and their sliding bodies accumulate contamination, the bearings increasingly impart eccentric bending moment to the Force Transducer that is connected to the bearings. Increase of the eccentric moment results in deterioration of the reproducibility especially in calibrations of small rated capacity Force Transducer. By replacing the aged rod-end bearings, improvement of the reproducibility has been confirmed in calibrations of three tensile Force Transducers of 50 N, 200 N and 1 kN rated capacities. Improvement by replacement of aged rod-end bearings was effective for Force Transducers with small rated capacities, because they are more sensitive to the certain eccentric Forces and moments than that with large capacities.

  • Automatic rotation equipment for tensile Force Transducers applying to 3 kN dead-weight type Force standard machine
    2011
    Co-Authors: Toshiyuki Hayashi, Yoshihisa Katase, Hiroshi Maejima, Yukio Yamaguchi, Kazunaga Ueda
    Abstract:

    Automatic rotation equipment for tensile Force Transducers has been developed for the 3 kN dead-weight type Force standard machine (DWM). ISO 376, the international standard concerning the calibration method of Force proving instruments, requires measurements at three or more different rotational positions of a Force Transducer. Fully automatic calibration of the Force Transducer would be enabled when the Force Transducer could be automatically rotated. We had already developed automatic rotation equipment for compressive Force Transducers applying to the 3 kN DWM. By newly developing that for tensile Force Transducers, we realized fully automatic calibration of the both compressive and tensile Force Transducers using the 3 kN DWM.

  • evaluation of tuning fork type Force Transducer for use as a transfer standard
    Measurement, 2008
    Co-Authors: Toshiyuki Hayashi, Kazunaga Ueda, Yoshihisa Katase, Tsuyoshi Hoshino, Hiroshi Suzawa, Masaaki Kobayashi
    Abstract:

    Abstract Tuning fork type Force Transducers have potentially better long-term stability than conventional strain gauge types. This is because they directly convert applied Force to resonant frequency, a conversion mechanism which is inherently insensitive to the inherent characteristics of elastic bodies utilized in Force Transducers. A new Force Transducer of 50 N rated capacity has been developed herein, and adopts a double-ended tuning fork (DETF) sensing unit. The performance of two such DETF Force Transducers was evaluated using the 500 N Force standard machine at the National Metrology Institute of Japan (NMIJ). While realizing fine resolutions comparable to those of the conventional strain gauge type Force Transducers, the DETF Force Transducers were found to have low creep, low hysteresis, low temperature coefficient and superior long-term stability.

Weigong Zhang - One of the best experts on this subject based on the ideXlab platform.

  • design of real time filter for the wheel Force Transducer
    Sensor Review, 2015
    Co-Authors: Dong Wang, Weigong Zhang
    Abstract:

    Purpose – Wheel Force Transducers (WFTs) have performance characteristics that make them attractive for applications in endurance evaluation of road vehicles, ride and handling optimization, tire development and vehicle dynamics. As a WFT is mounted on the the driven wheel, the loads on the wheel and the outputs of WFTs are usually nonlinearly related. Thus, a real-time filter is needed to measure the true loads on the wheel. Design/methodology/approach – In this paper, a new nonlinear filtering algorithm utilizing quadrature Kalman filter (QKF) is proposed to track the actual loads in real time through establishing the specific observation equations with Singer models. Findings – The simulation results show that the accuracy and the rapidity of QKF outperforms the capability of the unscented Kalman filter (UKF). Then, the dynamic tests on the MTS testing platform give the comparisons between the real-time QKF and the wavelet transform, where the former has superior dynamic accuracy. Finally, the practica...

  • inertia coupling analysis of a self decoupled wheel Force Transducer under multi axis acceleration fields
    PLOS ONE, 2015
    Co-Authors: Lihang Feng, Weigong Zhang
    Abstract:

    Wheel Force Transducer (WFT), which measures the three-axis Forces and three-axis torques applied to the wheel, is an important instrument in the vehicle testing field and has been extremely promoted by researchers with great interests. The Transducer, however, is typically mounted on the wheel of a moving vehicle, especially on a high speed car, when abruptly accelerating or braking, the mass/inertia of the Transducer/wheel itself will have an extra effect on the sensor response so that the inertia/mass loads will also be detected and coupled into the signal outputs. The effect which is considered to be inertia coupling problem will decrease the sensor accuracy. In this paper, the inertia coupling of a universal WFT under multi-axis accelerations is investigated. According to the self-decoupling approach of the WFT, inertia load distribution is solved based on the principle of equivalent mass and rotary inertia, thus then inertia impact can be identified with the theoretical derivation. The verification is achieved by FEM simulation and experimental tests. Results show that strains in simulation agree well with the theoretical derivation. The relationship between the applied acceleration and inertia load for both wheel Force and moment is the approximate linear, respectively. All the relative errors are less than 5% which are within acceptable and the inertia loads have the maximum impact on the signal output about 1.5% in the measurement range.

  • design and optimization of a self decoupled six axis wheel Force Transducer for a heavy truck
    Proceedings of the Institution of Mechanical Engineers Part D: Journal of Automobile Engineering, 2015
    Co-Authors: Lihang Feng, Han Pang, Weigong Zhang, Tie Wang
    Abstract:

    A wheel Force Transducer is a vital instrument in the vehicle-testing field which provides a means for determining experimentally the Forces and the moments transmitted to a vehicle through the tyr...

  • Research on the Online Initial Value Calibration Method for the Wheel Force Transducer
    IEEE Sensors Journal, 2015
    Co-Authors: Dong Wang, Weigong Zhang
    Abstract:

    Due to the special characteristics of the wheel Force Transducer (WFT), the traditional methods are hard to acquire the initial values of the WFT precisely and conveniently. Aiming at the problem, two online calculation methods for the initial value are proposed in this paper. The key of these methods is that the two proposed methods convert the problem of solving the initial values to an optimization problem. The two methods do not need any calibration equipments or additional manual operation, just require to drive the vehicle on a relatively flat road at an approximate constant speed for a while or park the vehicle on the relatively flat ground for several times. To find out the factors which influence the performance of the proposed methods, the experiments on the simulating data are carried out. To verify the effect of the presented methods, the experiments on the wheel test bed and dynamic road test are carried out. The experiment results show that the presented two initial value calculation methods can acquire the initial values of the WFT with high accuracy and simple operation.

  • A self-decoupled three-axis Force sensor for measuring the wheel Force
    Proceedings of the Institution of Mechanical Engineers Part D: Journal of Automobile Engineering, 2014
    Co-Authors: Guoyu Lin, Han Pang, Weigong Zhang, Dong Wang, Lihang Feng
    Abstract:

    The wheel Force Transducer is an important device in the automotive testing field which can measure the Force or torque applied to the wheel. Because existing wheel Force Transducers are almost commercial products, they are too expensive and technical information about them has not been made public; this slows down the development of the wheel Force Transducer to a certain extent. Accordingly a three-axis wheel Force Transducer is presented in this paper which is self-decoupled without calculating the decoupling matrix in theory. Its elastic body has a spoke structure with eight elastic beams, which means that it is easy to fabricate. This paper first introduces the overall elastic body structure of the proposed wheel Force Transducer. Then the strain gauge arrangement, the principle of strain measurement, the connection modes of the bridge circuits and the rotation decoupling principle for Fx and Fz are analysed, and the self-decoupled characteristics are depicted in detail. Finally, to verify the validity of the designed wheel Force Transducer, three kinds of experiment are carried out. In the static experiments the static performance and the self-decoupled characteristics of the wheel Force Transducer are verified; in the dynamic tests, a vehicle dynamics test system is adopted to verify the accuracy of the wheel Force Transducer in the dynamic environment; in road tests, the sensor is installed in the vehicle to verify whether the output of the proposed wheel Force Transducer can reflect the variation in the Force applied to the wheel in practical applications. The results shows the following: first, the maximum non-linearity error, the maximum hysteresis error and the maximum repeatability error of the proposed wheel Force Transducer are 0.9% of the full scale, 1.1% of the full scale and 0.5% of the full scale respectively; second, the static coupling rate is about 0.08%, which means that the designed wheel Force Transducer is self-decoupled in theory; third, the proposed wheel Force Transducer can measure Fx, Fz and My effectively in real applications. © IMechE 2013.

K.p. Roos - One of the best experts on this subject based on the ideXlab platform.

  • Miniature heart cell Force Transducer system implemented in MEMS technology
    IEEE Transactions on Biomedical Engineering, 2001
    Co-Authors: R.e. Palmer, K.s.j. Pister, K.p. Roos
    Abstract:

    A fully submersible Force Transducer system for use with isolated heart cells has been implemented using microelectromechanical systems (MEMS) technology. By using integrated circuit fabrication techniques to make mechanical as well as electrical components, the entire low-mass Transducer is only a few cubic millimeters in size and is of higher fidelity (/spl ap/100 nN and 13.3 kHz in solution) than previously available. When chemically activated, demembranated single cells attached to the device contract and slightly deform a strain gauge whose signal is converted to an amplified electrical output. When integrated with a video microscope, the system is capable of optical determination of contractile protein striation periodicity and simultaneous measurement of heart cell Forces in the 100-nN to 50-/spl mu/N range. The average measured maximal Force was F/sub max/=5.77/spl plusmn/2.38 /spl mu/N. Normalizing for the cell's cross-sectional area, F/sub max//area was 14.7/spl plusmn/7.7 mN/mm/sup 2/. Oscillatory stiffness data at frequencies up to 1 kHz has also been recorded from relaxed and contracted cells. This novel MEMS Force Transducer system permits higher fidelity measurements from cardiac myocytes than available from standard macro-sized Transducers.

  • Measurement of contractile characteristics from isolated heart cells using a miniaturized Force Transducer system
    Proceedings of 16th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 1994
    Co-Authors: K.s.j. Pister, K.p. Roos
    Abstract:

    A custom-designed microelectromechanical Force Transducer, with a volume less than one cubic millimeter, is being developed to quantify Forces generated in isolated, contracting cardiac muscle cells in order to elucidate the physiology of muscle. A single heart cell is attached to flexible, hinged polysilicon plates submerged in a nutrient solution. As the cell contracts, the plates bend, and the contractile Force can be measured based on the known spring constant of the plate. The amount of deflection is measured by piezoresistive, ion-implanted strain gauges placed at the base of the plates. Prototype structures have been fabricated and have been mechanically tested using metal probes. The authors have demonstrated that living rat heart cells can be attached to polysilicon using a commercial silicone sealant. They have also observed that polysilicon is an inert material when exposed to cardiac cells and their saline environment and has no detectable effect on the cells themselves.