This thesis studies the applicability of the Dynamic model reduction method that is used for direct plant order reduction in the active vibration control of large and flexible structures. A comparison of the performances between the reduced models produced by the Dynamic model reduction method and those obtained by other common model reduction methods such as the Guyan method, and the Mode-displacement method have been carried out. By using a full analytical model of a twenty storey building as the reference, each three degrees of freedom model was compared by computer simulation. The open-loop frequency response simulation, open-loop earthquake simulation, and the closed-loop earthquake simulation were all used to initially evaluate the reduced models. The accuracy of the frequency responses was assessed with sinusoidal applied forces, and for the closed-loop dynamic analysis, an active mass damper at the top storey and a recorded earthquake excitation was used. When compared with the simulation results of the Guyan method, the Dynamic method has many advantages, especially in terms of its accuracy at the high frequency range. The Mode-displacement method produces reduced models that are good for dynamic analysis of open-loop systems, but it was found to be inconvenient for use in active control. Finally, the Dynamic model reduction method and Guyan method were compared using experimental test results. A 2.5m tall building model with 20 floors was used as the plant, with a linear motor installed at the top storey for the purposes of active-damping. Although the results of simulations would suggest that both models perform sufficiently, experimental testing proved that only the Dynamic model performs adequately for this specific application of active control. The problem associated with most model reduction methods, such as the Guyan, is that they are based on full-order models that were derived from the linear elastic theory. The versatility of the Dynamic model reduction method is such that it provides the option of obtaining system parameters directly from experiment, not just from theory. The experimental procedure ensures that the Dynamic model reduction method forms an accurate description of the real system dynamics. The applicability of this method for obtaining low-order plant models was demonstrated through real-time active control testing of the model structure, while it was subject to a sinusoidal excitation. The tests have shown that the Dynamic model reduction method can be used as an alternative approach for the model reduction of structural systems for the purpose of active vibration control.

Thesis (B.Sc)--University of Hong Kong, 2004. / Includes bibliographical references (p. 63-67)

Thesis (B.Sc)--University of Hong Kong, 2004. / Includes bibliographical references (p. 127-132)

Thesis (B.Sc)--University of Hong Kong, 2006. / Includes bibliographical references (p. 94-102)

Thesis (B.Sc)--University of Hong Kong, 2006. / Includes bibliographical references (p. 126-133)

Thesis (M. Sc.)--University of Hong Kong, 2006. / Title proper from title frame. Also available in printed format.

Sustainable building (SB) tools have been recognized and explored in different regions as among the most effective means to encourage, regulate and assist SB development. A large variety of SB tools have been developed and applied in the marketplace, while a number of new tools emerge each year. While the early-developed SB tools provide general references and resources, it is still not easy either to select from existing tools, to develop new tools, or to customize existing tools for any specific region. On the one hand, the quickly expanding number of tools is developed with different styles, contents, functions, underlying assumptions as well as limitations relating to the specific conditions in their origin regions. Without a comprehensive framework to classify the tools, it is difficult to select the right ones out for any specific task in hand. On the other hand, the conditions and requirements for developing SB tools in a specific region are multi-faceted and complex. Without a proper understanding of them from a holistic point of view, it is difficult to say which tools or which type of tools are indeed needed and appropriate in a region. Recognizing the demand for developing and applying specific SB tools in different regions and the confusion surrounding existing tools, this research establishes two comprehensive conceptual frameworks to classify SB tools and SB issues. The framework for SB tools includes four related categories that focus on building stakeholders, building activities, buildings, and building performances. The framework for SB issues constitutes two combined hierarchy structures each for the performance (P) factors and the decision-making (D) factors respectively. These two frameworks not only serve as guides toward identifying the types of tools (existing or not) that are needed and suitable in a specific region, but also facilitate the selection and customization of existing tools for specific regions. Guided by the two generic frameworks established in the research, China specific conditions and requirements for SB tools are investigated. China specific SB issues are first identified from three preliminary SB tools in the country and classified according to the generic frameworks for SB issues. A questionnaire survey targeting local architects is then conducted in four selected cities. Answers in the replied questionnaires are analysed with the SPSS software and the Content Analysis method. Local architects??? perception about the relative importance of SB issues and their preferences and expectation about the characters, orientations, functions and styles of SB tools are identified and compared with that in existing SB tools. Accordingly, similarities and contradictions between existing tools and local architects??? perceptions, preferences, and expectations regarding China specific SB tools are summarized and discussed. Synthesizing the above research and investigation about the generic and regionally specific aspects of SB tools, this thesis finally proposes a holistic approach to developing generic vs. regionally specific frameworks for SB tools. First, a more balanced approach for developing SB tools in both the broad and narrow senses is proposed and discussed; second, a suite approach for developing SB tools in both the functional and spatial dimensions is proposed and discussed. Conceptual frameworks are established in the discussions; examples are provided to illustrate the concepts; and recommendations are made for further development of the generic vs. regionally specific frameworks for SB tools in China.

Sustainable building (SB) tools have been recognized and explored in different regions as among the most effective means to encourage, regulate and assist SB development. A large variety of SB tools have been developed and applied in the marketplace, while a number of new tools emerge each year. While the early-developed SB tools provide general references and resources, it is still not easy either to select from existing tools, to develop new tools, or to customize existing tools for any specific region. On the one hand, the quickly expanding number of tools is developed with different styles, contents, functions, underlying assumptions as well as limitations relating to the specific conditions in their origin regions. Without a comprehensive framework to classify the tools, it is difficult to select the right ones out for any specific task in hand. On the other hand, the conditions and requirements for developing SB tools in a specific region are multi-faceted and complex. Without a proper understanding of them from a holistic point of view, it is difficult to say which tools or which type of tools are indeed needed and appropriate in a region. Recognizing the demand for developing and applying specific SB tools in different regions and the confusion surrounding existing tools, this research establishes two comprehensive conceptual frameworks to classify SB tools and SB issues. The framework for SB tools includes four related categories that focus on building stakeholders, building activities, buildings, and building performances. The framework for SB issues constitutes two combined hierarchy structures each for the performance (P) factors and the decision-making (D) factors respectively. These two frameworks not only serve as guides toward identifying the types of tools (existing or not) that are needed and suitable in a specific region, but also facilitate the selection and customization of existing tools for specific regions. Guided by the two generic frameworks established in the research, China specific conditions and requirements for SB tools are investigated. China specific SB issues are first identified from three preliminary SB tools in the country and classified according to the generic frameworks for SB issues. A questionnaire survey targeting local architects is then conducted in four selected cities. Answers in the replied questionnaires are analysed with the SPSS software and the Content Analysis method. Local architects??? perception about the relative importance of SB issues and their preferences and expectation about the characters, orientations, functions and styles of SB tools are identified and compared with that in existing SB tools. Accordingly, similarities and contradictions between existing tools and local architects??? perceptions, preferences, and expectations regarding China specific SB tools are summarized and discussed. Synthesizing the above research and investigation about the generic and regionally specific aspects of SB tools, this thesis finally proposes a holistic approach to developing generic vs. regionally specific frameworks for SB tools. First, a more balanced approach for developing SB tools in both the broad and narrow senses is proposed and discussed; second, a suite approach for developing SB tools in both the functional and spatial dimensions is proposed and discussed. Conceptual frameworks are established in the discussions; examples are provided to illustrate the concepts; and recommendations are made for further development of the generic vs. regionally specific frameworks for SB tools in China.

Thesis (Ed.D.)--Baylor University, 2005. / Includes bibliographical references (p. 105-109).

This thesis examines ways to reduce energy consumption in university buildings. Occupancy based controls and other advanced building technologies being studied at the Intelligent Workplace (IW) at Carnegie Melon University were examined to see if they could be applied in at Texas A&M International University (TAMIU). Additionally, a sustainability assessment for the current TAMIU campus was performed with an analysis of the potential for TAMIU to obtain LEED certification from the US Green Building Council. First, occupancy-based controls that would shut off lighting, utilize power management features on computer equipment, and reduce airflow when a space is unoccupied were examined. An estimated annual savings of $525 could be obtained in the test office at Texas A&M by implementing these controls. If same controls were applied to the proposed green building at TAMIU, approximately $203,422 could be saved annually. Secondly, advanced building technologies used at the IW were examined to see if they are feasible in the new green building at TAMIU. Biodiesel cogeneration was found to be economically infeasible as a main power supply using the loads calculated for the building. A feasibility calculation for a radiant heating and cooling system with ventilation was performed and it was estimated that using one of these systems could have potential at TAMIU if the building envelope is designed correctly. Displacement ventilation could be implemented for research purposes in the test bed, but should not be implemented on a broader basis until more is known about the performance of these systems in hot and humid climates. Daylighting should be used in the new building whenever its implementation will not significantly increase solar loads. Thirdly, a sustainability assessment of the current TAMIU campus was performed. Several good practices and areas for improvement were identified in nine sustainability-related areas. The current TAMIU campus was examined to see what scope of work would be required to achieve LEED certification from the US Green Building Council. It was found that 39 credits, which is enough to achieve LEED certification, are either achievable as-is, achievable with a policy change, or achievable with a minor retrofit scope.