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Rucha_Joshi_Masters_Thesis_Fall17.pdf (17.36 MB)

ETD Abstract Container

Abstract Header

Vibroacoustic source characterization of electrical pumps with application to residential dishwashers

Joshi, Rucha
http://rave.ohiolink.edu/etdc/view?acc_num=osu1555516017124571

Abstract Details

2019, Master of Science, Ohio State University, Mechanical Engineering.
This research is motivated by the desire of manufacturers to efficiently design products that produce less objectionable sounds. For example, residential dishwashers are commonly installed in kitchens with open floorplans and thus, consumers demand quieter dishwashers. Here, the operation of the electrical drain and circulation pumps are common sources of noise and vibration. As such, the research goal is develop a method to characterize these two vibroacoustic sources for a total of four electrical pumps powered by DC, AC polyphase, and AC single-phase synchronous motors. To accomplish this goal, controlled laboratory experiments are designed to permit the pumps to operate under flow conditions and its vibration measurements then serve as a set of benchmark measurements to compare modeling methods and predictions. The laboratory experiments are carefully modeled using high fidelity finite element methods and the model parameters are iteratively updated to minimize the difference between modal impulse measurements. Next, operational measurements are carried out on the experimental setup with the under controlled flow and upstream pressure conditions. Two forcing mechanisms are investigated through exercising high fidelity finite element models including both rotating imbalance and motor torque fluctuations. Using the operational measurements and transfer functions from the finite element models, excitation profiles are obtained and validated against the complete acceleration spectra measured. The harmonic peaks observed in the excitation profiles for each pump remain dominant with and without the addition of water to the circuit indicating that source is motor torque fluctuations at integer multiples of the line and rotational frequencies. The presence of water introduces a flow induced vibration which increases the broadband vibration level by an average of about 4 dB for the pumps examined within this research.
Scott Noll (Advisor)
Luke Fredette (Committee Member)
Shawn Midlam-Mohler (Committee Member)
143 p.
Mechanical Engineering

Recommended Citations

Citations

  • Joshi, R. (2019). Vibroacoustic source characterization of electrical pumps with application to residential dishwashers [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1555516017124571

    APA Style (7th edition)

  • Joshi, Rucha. Vibroacoustic source characterization of electrical pumps with application to residential dishwashers. 2019. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1555516017124571.

    MLA Style (8th edition)

  • Joshi, Rucha. "Vibroacoustic source characterization of electrical pumps with application to residential dishwashers." Master's thesis, Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1555516017124571

    Chicago Manual of Style (17th edition)

osu1555516017124571
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This open access ETD is published by The Ohio State University and OhioLINK.