Sheng Li

Zhejiang University, Hang-hsien, Zhejiang Sheng, China

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Publications (4)2.66 Total impact

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    ABSTRACT: Thermoelectric energy harvesting is emerging as a promising alternative energy source to drive wireless sensors in mechanical systems. Typically, the waste heat from spindle units in machine tools creates potential for thermoelectric generation. However, the problem of low and fluctuant ambient temperature differences in spindle units limits the application of thermoelectric generation to drive a wireless sensor. This study is devoted to presenting a transformer-based power management system and its associated control strategy to make the wireless sensor work stably at different speeds of the spindle. The charging/discharging time of capacitors is optimized through this energy-harvesting strategy. A rotating spindle platform is set up to test the performance of the power management system at different speeds. The experimental results show that a longer sampling cycle time will increase the stability of the wireless sensor. The experiments also prove that utilizing the optimal time can make the power management system work more effectively compared with other systems using the same sample cycle.
    Sensors 07/2014; 14(7):12701-12714. · 2.05 Impact Factor
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    ABSTRACT: Purpose ‐ For using wireless sensors to monitor spindle units without opening the spindle shell to replace the battery, harvesting the waste heat from spindle units of machine tools for thermoelectric generation to drive wireless sensors is studied in this paper. The paper aims to discuss these issues. Design/methodology/approach ‐ In this paper, the thermal network method and the analogies between electrical and thermal domains are used in the simulation of power output performance of thermoelectric generation on a rotating spindle. After that, experiments are done to obtain the real power output performance of the generation and evaluate the feasibility to drive wireless sensors. Findings ‐ The paper provides that the output voltage of the thermoelectric generations was nearly linear with the rotating speed of the spindle, the output voltage was sensitive to the fixed position of the generations, and the thermoelectric system could drive the wireless sensor well most of the time during continuous operation of the spindle. Research limitations/implications ‐ It is found that the thermoelectric generation could not provide enough power in the early start-up stage of the spindle rotation, so a high-efficiency power manage system, which will be studied in the future research, is needed to handle this problem. Practical implications ‐ The paper includes implications for the development of self-powered wireless sensors in the spindle unit for machine tool monitoring. Originality/value ‐ The paper develops a model of the power output performance of thermoelectric generation on a rotating spindle and tests the feasibility to drive wireless sensors with this power.
    Sensor Review 03/2014; 34(2). · 0.62 Impact Factor
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    ABSTRACT: Composite multipoint thermometric system of CNC machine tools includes 64 digital temperature sensors 16 thermocouples and 8 thermal resistances. Its accuracy can reach ± 0.5°C and its special function contains saving data and drawing picture after measuring. The system works stably and reliably during the test and its measuring data can satisfy requirements of the mathematical modeling.
    Mechanic Automation and Control Engineering (MACE), 2010 International Conference on; 07/2010
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    ABSTRACT: This paper designs an embedded displacement measuring device based on error separating technique of multi-circle overlapping three-probe method. Considering the requirement of high precision and high speed of modern CNC machine, high accuracy CCD laser displacement sensor is used in the system to measure the rotating spindle, and then the device send the result to PC for further analysis by error separating software. According to the experiment, the roundness errors separated by such method are totally similar, rotation accuracy increase as rotation speed accelerated in a certain speed. All of these are realistic.
    Mechanic Automation and Control Engineering (MACE), 2010 International Conference on; 07/2010

Publication Stats

1 Citation
2.66 Total Impact Points

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Institutions

  • 2010
    • Zhejiang University
      • State Key Lab of Fluid Power Transmission and Control
      Hang-hsien, Zhejiang Sheng, China