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  • AIP Publishing  (2)
  • Lu, Xiaohui  (2)
  • Zhao, Xilu  (2)
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  • AIP Publishing  (2)
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  • 1
    Online Resource
    Online Resource
    Piezoelectric energy harvesting in coupling-chamber excited by the vortex-induced pressure
    AIP Publishing ; 2016
    In:  Applied Physics Letters Vol. 109, No. 7 ( 2016-08-15)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 109, No. 7 ( 2016-08-15)
    Abstract: The performance of a piezoelectric energy harvester with a coupling chamber was investigated under vortex-induced pressure. The harvester consisted of a power chamber, a buffer, and a storage chamber. Different types of vortex (i.e., clockwise or counter-clockwise) could be induced by changing the volume ratio between the power chamber and the storage chamber. The peak voltage of the harvester could be tuned by changing the volume ratio. For example, under a pressure of 0.30 MPa, input cycle of 2.0 s, and flow rate of 200 l/min, the peak voltage decreased from 79.20 to 70.80 V with increasing volume ratio. The optimal volume ratio was 2.03, which resulted in the formation of a clockwise vortex. The corresponding effective power through a 600 kΩ resistor was 1.97 mW.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4961528
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2016
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Performance improvement of smooth impact drive mechanism at low voltage utilizing ultrasonic friction reduction
    AIP Publishing ; 2016
    In:  Review of Scientific Instruments Vol. 87, No. 8 ( 2016-08-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 87, No. 8 ( 2016-08-01)
    Abstract: The smooth impact drive mechanism (SIDM) actuator is traditionally excited by a saw-tooth wave, but it requires large input voltages for high-speed operation and load capacity. To improve the output characteristic of the SIDM operating at low input voltage, a novel driving method based on ultrasonic friction reduction technology is proposed in this paper. A micro-amplitude sinusoidal signal with high frequency is applied to the rapid deformation stage of the traditional saw-tooth wave. The proposed driving method can be realized by a composite waveform that includes a driving wave (D-wave) and a friction regulation wave (FR-wave). The driving principle enables lower input voltage to be used in normal operation, and the principle of the proposed driving method is analyzed. A prototype of the SIDM is fabricated, and its experimental system is established. The tested results indicate that the actuator has suitable velocity and load characteristics while operating at lower input voltage, and the load capacity of the actuator is 2.4 times that of an actuator excited by a traditional saw-tooth driving wave.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.4960392
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2016
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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    Online Resource
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