This thesis is to develop a new ocean-wave-energy acquisition system. This system is composed of a float plate, a buoy, a nearly resonant vibrator, a dynamotor, and an oil pressure system. The whole system can be divided into two sub-systems by its function: energy generation system or vibration reduction system. Each of them can generate energy from ocean wave and reduce the vibration of flow plate. After simplifying the dynamic model and optimization analysis, we will discuss with the influence of parameters on the amount of energy and the vibration reduction. Energy generation system want to the maximum power by optimizing system parameters (mass of the buoy, mass of the nearly resonant vibrator, the coefficient of spring, and the coefficient of generator). Here we will use four kinds of optimization methods. In the first three methods, we want to find the suitable parameters to make system to generate the maximum power at an operation of frequency wave. These three methods are different from the request of the relation phase of displacement between the buoy and the nearly resonant vibrator. The fourth method, we want to find the parameters of system, which can generate power evenly at each of frequency in a range of frequency wave motion. The work is done by searching for minimum variance of power. Vibration reduction system can reduce the vibration of float plate by optimizing parameter. After simplifying and making some assumptions, system can be simplified approximately to a vibration absorber at a specific frequency. There is no displacement at that frequency, but there are displacements on the other frequency of the operation range. In order to let system to apply properly in a range of frequency, we find the minimum one that is the maximum displacement in the range of frequency. After optimization design, we can get each result from these two sub-systems. From the first three methods of energy generation system, all energy distributes on the around of operation frequency. There are no frequencies on the others of the operation range. Moreover, the displacement of each body in this system is too large to apply. By the fourth method, energy-frequency curve is evenly on the operation range. Overall, the average of energy is larger than that of frequency of system whose design concept from first three methods. The displacements of each body in this system are small enough to apply. In vibration reduction system, we search the parameters in the optimization methods. The results show that vibration reduction just occurs around the operation frequency and the others in the range not

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Thesis (M.S.)--University of Michigan, 1985.

Thesis (MTech (Environmental Health))--Peninsula Technikon, 2004. / Word processed copy. Summary in English. Includes bibliographical references (leaves 122-126). Also available online.

Thesis (Ph. D.)--University of Hong Kong, 1999. / Includes bibliographical references.

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<p> A brief comparison between the ROM models is made in this study.</p>

<p dir="ltr">This study encompasses the design and dynamic analysis of a previously used compact, portable vibrating plate machine. Utilizing Siemens NX 2021 for the precise modeling of the machine's components, the design prioritized simplicity and functionality, resulting in a 450 mm x 450 mm aluminum alloy structure, suitable for a wide range of research applications. A detailed modal analysis, conducted to ascertain the system's natural frequencies, revealed six predominant modes, ensuring operational frequencies of 110 Hz to 130 Hz were strategically avoided to mitigate resonance risks. Complementing this, harmonic response analysis evaluated the system's behavior under an applied cyclic load, confirming the suitability of the chosen actuator, model VL181206-160H, which provides optimal vibrational force without over stressing the machine. The findings affirm the machine's capability to perform efficiently within the target frequency range, with the design and selected actuator offering a robust solution for consistent and safe vibrational analysis, essential for field and laboratory applications.</p>