The purpose of this thesis is to develop a novel design of the oscillatory type of wave-energy acquisition system. It is aimed to increase the efficiency of wave-power acquisition from random sea. The main feature of the new system structure is its flexibility to adjust the system dynamics to satisfy two optimal criteria. The effects of various system parameters on the system dynamics and acquired power were analyzed. To find the set of system parameters to acquire the highest power, an optimization searching method was adopted. Finally, a regression model was established to help the user to calculate the optimal system parameters under various application conditions. The study first indicated that to acquire high power from sea wave the dynamic characteristics of the system should satisfy two criteria. However, the study also revealed that the dynamic properties of a traditional acquisition system are difficult to fulfill the two criteria in a wide frequency band. Accordingly, a new system structure was proposed. It is composed of a traditional acquisition system and a vibrating platform. The platform is linked to the acquisition system through a spring. Because of the coupling effect, the dynamic characteristics of the acquisition system are altered. The effects of varying different system parameters on the locations of pole or zero of the transfer function of acquisition system were examined. It was shown that with a proper choice of system parameters, the frequency bandwidth satisfying or close to the two criteria may be increased. The study indicated that acquired power of the proposed system is higher than the traditional one by 34%.

Submitted by PPG Engenharia El?trica (engenharia.pg.eletrica@pucrs.br) on 2018-10-16T14:38:56Z No. of bitstreams: 1 ANA PAULA RODRIGUES MARQUES_DIS.pdf: 2882882 bytes, checksum: a47b86d791e0aae8d3266c6fc3b8a61b (MD5) / Approved for entry into archive by Sheila Dias (sheila.dias@pucrs.br) on 2018-10-18T11:08:37Z (GMT) No. of bitstreams: 1 ANA PAULA RODRIGUES MARQUES_DIS.pdf: 2882882 bytes, checksum: a47b86d791e0aae8d3266c6fc3b8a61b (MD5) / Made available in DSpace on 2018-10-18T11:15:22Z (GMT). No. of bitstreams: 1 ANA PAULA RODRIGUES MARQUES_DIS.pdf: 2882882 bytes, checksum: a47b86d791e0aae8d3266c6fc3b8a61b (MD5) Previous issue date: 2017-05-31 / There has been a recent increase in the use of new technologies playing an important role in promoting physical fitness, due to the positive impact they have on the health and quality of life of the individual. Taking this into consideration, the present work describes the development of a vibration platform linked to a flywheel (PV?I), which permits whole-body vibration (WBV) and resistance or isoinertial training. Correct measurement of the force values given by the flywheel and amplitude, frequency and acceleration ranges provided by the vibration platform was necessary for production of the prototype. The need to adapt various pieces of equipment and materials was also identified, such as the vibrator motor, springs, vibration dampers, roller bearings, axis, flywheel and frequency inverter. The equipment was validated through laboratory testing, aimed at verifying the performance of the PV?I. A comparator clock was used to measure amplitude, and a triaxial accelerometer provided the platform acceleration data. A frequency inverter was used to regulate the platform frequency. The vibration platform frequencies chosen for the prototype operation evaluation tests were 5Hz to 60Hz, with no platform load, the vibrator motor set at minimum intensity, with acceleration on all three axes (x, y and z) and amplitude measured every 5Hz. Tests were subsequently performed with a 52kg load, simulating the weight of a person, and the vibrator motor set at a vibration intensity of 10% and 20%. Both the platform displacement amplitude and acceleration measurements were acquired at 15Hz, 20Hz, 25Hz, 30Hz and 35Hz, and acceleration alone was also recorded at 40 Hz and 45 Hz. Two further tests were performed with a 55kg load and vibrator motor set at 30% and 40% intensity. These choices were based on findings in the literature, where the most encountered frequency ranges varied between 15Hz and 44Hz. The results demonstrate a relationship between frequency and amplitude; when one is altered the other also changes. The acceleration values collected during testing were used to analyze the vibration levels, in accordance with the ISO 2631-1 (1997) standard. The vibration levels of the platform, in the test configurations used, were confirmed as being acceptable. / O uso de novas tecnologias, que desempenham um papel importante em promover o condicionamento f?sico, tem se intensificado recentemente pelo impacto positivo que causam na qualidade de vida e na sa?de das pessoas. Com base nisso, o presente trabalho descreve o desenvolvimento de uma plataforma vibrat?ria associada a um volante de in?rcia (PV?I), os quais permitem treinamento de vibra??o de corpo inteiro (TVCI) e resistido ou isoinercial. Para a confec??o do prot?tipo, foi necess?rio o correto dimensionamento dos equipamentos, a partir dos valores de for?a oferecidos pelo volante de in?rcia e da faixa de amplitude, da frequ?ncia e da acelera??o fornecidas pela plataforma vibrat?ria. Foi tamb?m identificada a necessidade de adapta??o de diversos equipamentos e materiais, tais como motovibrador, molas, amortecedores de vibra??o, mancais de rolamento, eixo, volante de in?rcia e inversor de frequ?ncia. Para a valida??o do equipamento, foram realizados testes em laborat?rio, com o objetivo de verificar o funcionamento da PV?I. A medi??o de amplitude foi feita por um rel?gio comparador, enquanto os dados da acelera??o da plataforma foram adquiridos com o uso de um aceler?metro triaxial. A frequ?ncia aplicada ? plataforma foi regulada atrav?s de um inversor de frequ?ncia. As frequ?ncias da plataforma vibrat?ria escolhidas foram de 5Hz a 60Hz nos testes de avalia??o do funcionamento do prot?tipo sem qualquer carga sobre a plataforma e com o motovibrador em intensidade m?nima, sendo a acelera??o nos tr?s eixos (x, y e z) e a amplitude medidas a cada 5Hz. Ap?s, foram realizados testes com carga de 52kg, simulando a massa de uma pessoa, e o motovibrador regulado a uma intensidade de vibra??o de 10% e 20%. As amplitudes de deslocamento da plataforma foram adquiridas em 15Hz, 20Hz, 25Hz, 30Hz e 35 Hz, enquanto a medida da acelera??o incluiu tamb?m 40 Hz e 45Hz. Outros dois ensaios foram feitos com carga de 55kg e o motovibrador regulado a 30% e 40%. Tais escolhas foram feitas com base na literatura onde a faixa de frequ?ncia mais encontrada variam entre 15Hz e 44Hz. Os resultados demonstraram que h? uma rela??o entre frequ?ncia e a amplitude, pois quando se altera a frequ?ncia, a amplitude tamb?m se modifica. As acelera??es coletadas durante os testes serviram para fazer a an?lise dos n?veis de vibra??o, tendo como base a norma ISO 2631- 1 (1997), comprovando que s?o aceit?veis os n?veis de vibra??o da plataforma nas configura??es utilizadas nos testes.