Fault Diagnosis of Loaded Water Hydraulic Actuators by Online Testing with LabVIEW®

    Volume 31, Issue 5 (September 2003)

    ISSN: 0090-3973

    CODEN: JTEOAD

    Page Count: 10


    He, Y
    Postdoctoral fellow, Nanyang Technological University, School of Mechanical and Production Engineering,

    Chua, PSK
    Associate professor, Nanyang Technological University, School of Mechanical and Production Engineering,

    Lim, GH
    Associate professor, Nanyang Technological University, School of Mechanical and Production Engineering,

    Tan, ACH
    Research scholar, Nanyang Technological University, School of Mechanical and Production Engineering,

    (Received 7 November 2001; accepted 23 April 2003)

    Abstract

    In recent years, with the development of technology in materials and machining, it is becoming possible to produce modern water hydraulic components that are made of lubricant-free and anticorrosive materials and to achieve very close tolerances to reduce internal leakage due to the low viscosity of water. As water is nontoxic, environmentally friendly, and readily available, many industries are already turning to modern water hydraulic systems to replace their oil hydraulic counterparts. As with all systems, the increasing use of water hydraulic systems by more industries will result in a greater need to monitor and maintain the systems. This paper is concerned with online testing and fault diagnosis of loaded modern water hydraulic cylinders and axial piston motors. LabVIEW® (Laboratory Virtual Instrument Engineering Workbench) data acquisition hardware and development software were used for data acquisition and processing. Likely real-life faults were simulated on the hydraulic actuators' internal components. The actuators also were operated to capture their unique vibration signals in their faulty states and the results compared with reference signatures of the same actuators when they were in their new or healthy states. The vibration signatures and amplitude spectra, average extension/retraction duration, and flow trending amplitude of the water hydraulic actuators versus piston seal wear, rod seal wear, piston shoe wear, and capstan surface wear under different operating conditions of simulated loads and speeds are presented and discussed. The results show that there is a distinctive variation in vibration signals, flow rate, and average stroking duration with increase in loads for both actuators.


    Paper ID: JTE12361J

    DOI: 10.1520/JTE12361J

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    Title Fault Diagnosis of Loaded Water Hydraulic Actuators by Online Testing with LabVIEW®
    Symposium , 0000-00-00
    Committee D18