The Experts below are selected from a list of 18771 Experts worldwide ranked by ideXlab platform

B F Spencer - One of the best experts on this subject based on the ideXlab platform.

  • development of a wireless Displacement Measurement system using acceleration responses
    Sensors, 2013
    Co-Authors: Jongwoong Park, Hyungjo Jung, B F Spencer
    Abstract:

    Displacement Measurements are useful information for various engineering applications such as structural health monitoring (SHM), earthquake engineering and system identification. Most existing Displacement Measurement methods are costly, labor-intensive, and have difficulties particularly when applying to full-scale civil structures because the methods require stationary reference points. Indirect estimation methods converting acceleration to Displacement can be a good alternative as acceleration transducers are generally cost-effective, easy to install, and have low noise. However, the application of acceleration-based methods to full-scale civil structures such as long span bridges is challenging due to the need to install cables to connect the sensors to a base station. This article proposes a low-cost wireless Displacement Measurement system using acceleration. Developed with smart sensors that are low-cost, wireless, and capable of on-board computation, the wireless Displacement Measurement system has significant potential to impact many applications that need Displacement information at multiple locations of a structure. The system implements an FIR-filter type Displacement estimation algorithm that can remove low frequency drifts typically caused by numerical integration of discrete acceleration signals. To verify the accuracy and feasibility of the proposed system, laboratory tests are carried out using a shaking table and on a three storey shear building model, experimentally confirming the effectiveness of the proposed system.

Billie F. Spencer - One of the best experts on this subject based on the ideXlab platform.

Yi Qi - One of the best experts on this subject based on the ideXlab platform.

  • a noncontact fmcw radar sensor for Displacement Measurement in structural health monitoring
    Sensors, 2015
    Co-Authors: Cunlong Li, Hengyi Xu, Weimin Chen, Yi Qi
    Abstract:

    This paper investigates the Frequency Modulation Continuous Wave (FMCW) radar sensor for multi-target Displacement Measurement in Structural Health Monitoring (SHM). The principle of three-dimensional (3-D) Displacement Measurement of civil infrastructures is analyzed. The requirements of high-accuracy Displacement and multi-target identification for the measuring sensors are discussed. The fundamental measuring principle of FMCW radar is presented with rigorous mathematical formulas, and further the multiple-target Displacement Measurement is analyzed and simulated. In addition, a FMCW radar prototype is designed and fabricated based on an off-the-shelf radar frontend and data acquisition (DAQ) card, and the Displacement error induced by phase asynchronism is analyzed. The conducted outdoor experiments verify the feasibility of this sensing method applied to multi-target Displacement Measurement, and experimental results show that three targets located at different distances can be distinguished simultaneously with millimeter level accuracy.

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

  • A Starting Value Computation Method for Displacement Measurement Based on Magnetic Field
    2018 IEEE International Conference on Mechatronics and Automation (ICMA), 2018
    Co-Authors: Shengwu Du, Jinchun Hu, Ming Zhang
    Abstract:

    Displacement Measurement based on magnetic field has been exploited in motors and robots, however its Measurement error is seriously affected by the Measurement model accuracy. We have proposed a simultaneous computation of model parameters and Displacement approach to improve Measurement accuracy. While, in this approach, a starting value is needed at the initial Measurement moment because of its iterative computation form. Traditional computation methods for starting value have a small convergence range or singularity problems, which limit their application. In this paper, a computational method, multi-parameter numerical continuous with wide convergence range, is presented for calculating starting value. This method combines the characteristics of traditional homotopy continuous and Displacement Measurement. Multiple parameters are introduced to form new homotopy equations. And then, the homotopy equations are solved according to the character of Displacement solution. The simulation results verify that it has better convergence performance than tradition homotopy continuous method. Experimental results illustrate that the proposed method can compute a reasonable starting value for Displacement solution to realize precision Measurement based on magnetic field.

  • Sinusoidal phase-modulating laser diode interferometer for wide range Displacement Measurement.
    Applied Optics, 2017
    Co-Authors: Ming Zhang, Chang Ni, Chuxiong Hu, Jinchun Hu, Leijie Wang, Siqi Ding
    Abstract:

    A sinusoidal phase-modulating laser diode interferometer for wide range Displacement Measurement is proposed. To realize wide range Displacement Measurement, a signal processing method utilizing a look-up table to estimate the dynamic value of the effective sinusoidal phase-modulating depth is detailed, and the error caused by the residual amplitude modulation and the effective sinusoidal phase-modulating depth in wide range Displacement Measurement can be eliminated. It is discussed that the extended Measurement range depends on the monotone intervals of several specific functions. The simulation and experimental results prove that the sinusoidal phase-modulating laser diode interferometer with the proposed method could realize centimeter level Displacement Measurement range.

Jongwoong Park - One of the best experts on this subject based on the ideXlab platform.

  • development of a wireless Displacement Measurement system using acceleration responses
    Sensors, 2013
    Co-Authors: Jongwoong Park, Hyungjo Jung, B F Spencer
    Abstract:

    Displacement Measurements are useful information for various engineering applications such as structural health monitoring (SHM), earthquake engineering and system identification. Most existing Displacement Measurement methods are costly, labor-intensive, and have difficulties particularly when applying to full-scale civil structures because the methods require stationary reference points. Indirect estimation methods converting acceleration to Displacement can be a good alternative as acceleration transducers are generally cost-effective, easy to install, and have low noise. However, the application of acceleration-based methods to full-scale civil structures such as long span bridges is challenging due to the need to install cables to connect the sensors to a base station. This article proposes a low-cost wireless Displacement Measurement system using acceleration. Developed with smart sensors that are low-cost, wireless, and capable of on-board computation, the wireless Displacement Measurement system has significant potential to impact many applications that need Displacement information at multiple locations of a structure. The system implements an FIR-filter type Displacement estimation algorithm that can remove low frequency drifts typically caused by numerical integration of discrete acceleration signals. To verify the accuracy and feasibility of the proposed system, laboratory tests are carried out using a shaking table and on a three storey shear building model, experimentally confirming the effectiveness of the proposed system.