Thesis (Ph. D.)--University of Wisconsin--Madison, 1964. / Typescript. Vita. Description based on print version record. Includes bibliographical references (leaves 75-79).

Thesis (Ph. D.)--University of Wisconsin--Madison, 1968. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

The object of this work was to develop a computer technique for determining the characteristic parameters of spring-mass system with hysteresis effects from transient experimental data. The technique was intended to be utilized to determine the parameters of models of systems where complex geometry and rate dependent properties would make a determination of the model parameters most difficult, and where the parameters typically obtained from static test would not characterize the rate dependent properties accurately.

Made available in DSpace on 2015-05-08T14:44:59Z (GMT). No. of bitstreams: 1 arquivotal.pdf: 678134 bytes, checksum: 5075c4e813b3984f78c9a46e42c8948f (MD5) Previous issue date: 2009-03-27 / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES / This thesis had as main objective to identify the existence of hysteresis in exports of the Brazilian industrial sector. Therefore, we performed a descriptive analysis of exports (free on board), the quantities exported ( quantum ) and price indices, as well as the estimation of parameters of fractional differentiation to measure hysteresis. Of descriptive analysis is demonstrated evidence of hysteresis after the year 1999 in industrial exports, moreover, is not apparent persistence of medium-sized companies in periods of unfavorable exchange rate and persistence of large companies. The results of estimations corroborate the descriptive analysis identify hysteresis with partial effects for the period 1999-2002 and hysteresis for the period 2003-2007. Of the industries studied, two groups were prominent exporters of industrial products, with group 1 for sectors that have characterized the transition from partial to hysteresis with hysteresis effects. / Esta dissertação teve como objetivo identificar a existência de hysteresis nas exportações do setor industrial brasileiro. Portanto, foi realizada a análise descritiva das exportações ( Free on board ), das quantidades exportadas ( quantum ) e índices de preço, como também, a estimação de parâmetros de diferenciação fracionária para mensurar hysteresis. Da análise descritiva é demonstrada evidências de hysteresis após o ano de 1999 nas exportações industriais, além disso, é evidenciada não persistência das empresas de médio porte em períodos de câmbio desfavorável e persistência de empresas de grande porte. Os resultados das estimações corroboram com a análise descritiva, identificam hysteresis com efeitos parciais para o período 1999-2002 e hysteresis para o período 2003-2007. Dos setores industriais estudados, foram destacados dois grupos exportadores de produtos industriais, sendo o Grupo 1 caracterizado por setores que apresentam a transição de hysteresis com efeitos parciais para hysteresis.

No description available.

Hysteresis is exhibited by many physical systems. Smart materials such as piezoelectrics, magnetostrictives and shape memory alloys possess useful properties, especially in the field of micropositioning, but the control of these systems is difficult due to the presence of hysteresis. An accurate model is required to predict the behaviour of these systems so that they can be controlled. Several hysteresis models including the backlash, elastic-plastic and Preisach operators are discussed in detail. Several other models are mentioned. Other control methods for this problem are discussed in the form of a literature review. The focus of this thesis is on the PID control of hysteretic systems. In particular, two systems experiencing hysteresis in their controllers are examined. The hysteresis in each system is described by different sets of assumptions. These assumptions are compared and found to be very similar. In the first system, a PI controller is used to track a reference signal. In the second, a PID controller is used to control a second-order system. The stability and tracking of both systems are discussed. An extension is made to the first system to include the dynamics of a first-order system. The results of the second system are verified to hold for a general first-order system. Simulations were performed with the extension to a first-order system using different hysteresis models.

Hysteresis is exhibited by many physical systems. Smart materials such as piezoelectrics, magnetostrictives and shape memory alloys possess useful properties, especially in the field of micropositioning, but the control of these systems is difficult due to the presence of hysteresis. An accurate model is required to predict the behaviour of these systems so that they can be controlled. Several hysteresis models including the backlash, elastic-plastic and Preisach operators are discussed in detail. Several other models are mentioned. Other control methods for this problem are discussed in the form of a literature review. The focus of this thesis is on the PID control of hysteretic systems. In particular, two systems experiencing hysteresis in their controllers are examined. The hysteresis in each system is described by different sets of assumptions. These assumptions are compared and found to be very similar. In the first system, a PI controller is used to track a reference signal. In the second, a PID controller is used to control a second-order system. The stability and tracking of both systems are discussed. An extension is made to the first system to include the dynamics of a first-order system. The results of the second system are verified to hold for a general first-order system. Simulations were performed with the extension to a first-order system using different hysteresis models.

No description available.

Thesis (Ph.D.)--University of Western Australia, 2004.

Thesis (Ph. D.)--Virginia Polytechnic Institute and State University, 1993. / Vita. Abstract. Includes bibliographical references (leaves 97-99). Also available via the Internet.