摘要 :
Model-based systems engineering (MBSE) is increasingly being used for the design and development of complex systems. An MBSE approach can create a cohesive model of the system architecture and integrate various aspects of the desi...
展开
Model-based systems engineering (MBSE) is increasingly being used for the design and development of complex systems. An MBSE approach can create a cohesive model of the system architecture and integrate various aspects of the design. A key component of formulating an MBSE approach is having the capability to specify and express fundamental concepts about the system, and a systems modeling language gives that capability. In the past, Systems Modeling Language (SysML) has been widely implemented as an enabler of MBSE. However, several limitations of SysML have become apparent over the years that could not be resolved through simple revisions alone, so SysML v2 is under development. The primary limitation of SysML that this paper will address is the lack of interactivity and interoperability, which limits the ability to perform multidisciplinary analysis using the SysML model as input. This limitation has been alleviated using software solutions with SysML; however, the solutions are not guaranteed work together. This paper will evaluate the new innovations of SysML v2 with the primary emphasis on the new standard API and sophisticated textual language for enhancing interactivity and interoperability, especially with analysis tools, and propose a framework for leveraging these new capabilities in the design of a novel, hydrogen-powered aircraft. Development of this framework enables the automatic capture of decision-making based on new analysis or changes in requirements to update the system model and creates a method for coupling MBSE and MDAO activities.
收起
摘要 :
Model-based systems engineering (MBSE) is increasingly being used for the design and development of complex systems. An MBSE approach can create a cohesive model of the system architecture and integrate various aspects of the desi...
展开
Model-based systems engineering (MBSE) is increasingly being used for the design and development of complex systems. An MBSE approach can create a cohesive model of the system architecture and integrate various aspects of the design. A key component of formulating an MBSE approach is having the capability to specify and express fundamental concepts about the system, and a systems modeling language gives that capability. In the past, Systems Modeling Language (SysML) has been widely implemented as an enabler of MBSE. However, several limitations of SysML have become apparent over the years that could not be resolved through simple revisions alone, so SysML v2 is under development. The primary limitation of SysML that this paper will address is the lack of interactivity and interoperability, which limits the ability to perform multidisciplinary analysis using the SysML model as input. This limitation has been alleviated using software solutions with SysML; however, the solutions are not guaranteed work together. This paper will evaluate the new innovations of SysML v2 with the primary emphasis on the new standard API and sophisticated textual language for enhancing interactivity and interoperability, especially with analysis tools, and propose a framework for leveraging these new capabilities in the design of a novel, hydrogen-powered aircraft. Development of this framework enables the automatic capture of decision-making based on new analysis or changes in requirements to update the system model and creates a method for coupling MBSE and MDAO activities.
收起
摘要 :
Model-based systems engineering (MBSE) is increasingly being used for the design and development of complex systems. An MBSE approach can create a cohesive model of the system architecture and integrate various aspects of the desi...
展开
Model-based systems engineering (MBSE) is increasingly being used for the design and development of complex systems. An MBSE approach can create a cohesive model of the system architecture and integrate various aspects of the design. A key component of formulating an MBSE approach is having the capability to specify and express fundamental concepts about the system, and a systems modeling language gives that capability. In the past, Systems Modeling Language (SysML) has been widely implemented as an enabler of MBSE. However, several limitations of SysML have become apparent over the years that could not be resolved through simple revisions alone, so SysML v2 is under development. The primary limitation of SysML that this paper will address is the lack of interactivity and interoperability, which limits the ability to perform multidisciplinary analysis using the SysML model as input. This limitation has been alleviated using software solutions with SysML; however, the solutions are not guaranteed work together. This paper will evaluate the new innovations of SysML v2 with the primary emphasis on the new standard API and sophisticated textual language for enhancing interactivity and interoperability, especially with analysis tools, and propose a framework for leveraging these new capabilities in the design of a novel, hydrogen-powered aircraft. Development of this framework enables the automatic capture of decision-making based on new analysis or changes in requirements to update the system model and creates a method for coupling MBSE and MDAO activities.
收起
摘要 :
Small satellites are expanding our potential in the realm of space exploration to build and advance our off-world future. One critical challenge for small satellites is maintaining their thermal control in the vacuum of space wher...
展开
Small satellites are expanding our potential in the realm of space exploration to build and advance our off-world future. One critical challenge for small satellites is maintaining their thermal control in the vacuum of space where temperatures of sensitive components can fluctuate drastically. This challenge can be tackled through the modeling of internal satellite temperatures and the successful design of a Thermal Control System (TCS) to protect against freezing or overheating. Informed by CubeSat design trends and past research, we used Thermal Desktop to develop a thermal model of Beavercube-1, a student-built small satellite launching in 2021 to image coastal environments. Through our work, we show that with a comprehensive thermal model considering the structural configuration of the CubeSat and power loads at various stages throughout its lifetime, we can predict the temperature ranges of each component and set operational recommendations paralleling the thermal limits. We used our findings to develop an autonomous TCS that utilizes temperature measurements through resistance temperature detectors (RTDs) and heaters to maintain the satellite's thermal safety. Through iteration of our Thermal Desktop model, we were able to refine and simplify the design of our TCS, which reduced complexity, cost, and power consumption. With an optimized TCS that satisfies thermal control requirements, we can prevent critical mission failure from temperature extremes and enable our satellite to perform effectively and efficiently.
收起
摘要 :
Buildings with large plan dimensions, or exoskeleton systems, are examples of structures that require careful consideration of the impact of thermal load effects. Determination of the correct thermal loads to be applied to such st...
展开
Buildings with large plan dimensions, or exoskeleton systems, are examples of structures that require careful consideration of the impact of thermal load effects. Determination of the correct thermal loads to be applied to such structures to correctly evaluate thermal impacts is a complex problem that requires careful consideration of historic climate data, structural materials, construction procedures, sequences and schedules, exposure, orientation, shading, reflectance of adjacent surfaces, architectural finishes, insulation, and a host of other variables. Simplistic application of thermal loads to structures can easily result in grossly underestimated or overestimated member forces. A rational procedure to identify relevant variables, obtain necessary design information, develop bounding scenarios, and determine appropriate thermal loads to individual members to study structural impacts is presented. Examples of the application of such procedures to actual building structure designs are also presented.
收起
摘要 :
Buildings with large plan dimensions, or exoskeleton systems, are examples of structures that require careful consideration of the impact of thermal load effects. Determination of the correct thermal loads to be applied to such st...
展开
Buildings with large plan dimensions, or exoskeleton systems, are examples of structures that require careful consideration of the impact of thermal load effects. Determination of the correct thermal loads to be applied to such structures to correctly evaluate thermal impacts is a complex problem that requires careful consideration of historic climate data, structural materials, construction procedures, sequences and schedules, exposure, orientation, shading, reflectance of adjacent surfaces, architectural finishes, insulation, and a host of other variables. Simplistic application of thermal loads to structures can easily result in grossly underestimated or overestimated member forces. A rational procedure to identify relevant variables, obtain necessary design information, develop bounding scenarios, and determine appropriate thermal loads to individual members to study structural impacts is presented. Examples of the application of such procedures to actual building structure designs are also presented.
收起
摘要 :
When the building in question has historic significance, there is the added question of sustaining cultural heritage. Retrofitting and reusing such historic structures instead of demolishing and rebuilding them is an appropriate r...
展开
When the building in question has historic significance, there is the added question of sustaining cultural heritage. Retrofitting and reusing such historic structures instead of demolishing and rebuilding them is an appropriate response to sustaining heritage. The integrated structural solution to each building is specific and creates unique challenges in design and construction. The challenges are presented herein for the Strand Theater in San Francisco, the Desmond Building in Los Angeles, and the Veterans Affairs Medical Office Buildings in San Francisco.
收起
摘要 :
When the building in question has historic significance, there is the added question of sustaining cultural heritage. Retrofitting and reusing such historic structures instead of demolishing and rebuilding them is an appropriate r...
展开
When the building in question has historic significance, there is the added question of sustaining cultural heritage. Retrofitting and reusing such historic structures instead of demolishing and rebuilding them is an appropriate response to sustaining heritage. The integrated structural solution to each building is specific and creates unique challenges in design and construction. The challenges are presented herein for the Strand Theater in San Francisco, the Desmond Building in Los Angeles, and the Veterans Affairs Medical Office Buildings in San Francisco.
收起
摘要 :
Beyond LEED and other evaluation techniques that largely consider carbon emissions from building operations, a basis for design must be established to account for the embodied carbon in a structure. Minimal acceptable goals for im...
展开
Beyond LEED and other evaluation techniques that largely consider carbon emissions from building operations, a basis for design must be established to account for the embodied carbon in a structure. Minimal acceptable goals for implementation must then be created to encourage a responsible approach to environmental design-one that accounts for carbon emissions from groundbreaking through the building's service life. The Environmental Analysis Tool? is an advanced algorithm and freely available software facilitating the evaluation of embodied carbon in buildings. The algorithm is capable of considering the embodied carbon at the time of construction throughout an expected service life. An evaluation of embodied carbon in hundreds of built structures has revealed trends and correlations among common design parameters such as height, occupancy type, seismic and wind conditions. This information can be utilized by designers to set design goals and provide a basis for standards in the reduction of embodied carbon. Several structural system options for a prototype 5-story office building proposed by Court et al. in the 2013 SEAOC Convention Proceedings are evaluated for embodied carbon. Previously neglected, embodied carbon associated with probable seismic damage is included. Furthermore, the accounting and consideration of embodied carbon in the design and construction of two actual buildings are described. Finally, embodied carbon limits for structural systems considering material, construction, and probable seismic damage are proposed. It is the hope that these requirements would eventually become standards for the industry.
收起
摘要 :
Beyond LEED and other evaluation techniques that largely consider carbon emissions from building operations, a basis for design must be established to account for the embodied carbon in a structure. Minimal acceptable goals for im...
展开
Beyond LEED and other evaluation techniques that largely consider carbon emissions from building operations, a basis for design must be established to account for the embodied carbon in a structure. Minimal acceptable goals for implementation must then be created to encourage a responsible approach to environmental design-one that accounts for carbon emissions from groundbreaking through the building's service life. The Environmental Analysis Tool™ is an advanced algorithm and freely available software facilitating the evaluation of embodied carbon in buildings. The algorithm is capable of considering the embodied carbon at the time of construction throughout an expected service life. An evaluation of embodied carbon in hundreds of built structures has revealed trends and correlations among common design parameters such as height, occupancy type, seismic and wind conditions. This information can be utilized by designers to set design goals and provide a basis for standards in the reduction of embodied carbon. Several structural system options for a prototype 5-story office building proposed by Court et al. in the 2013 SEAOC Convention Proceedings are evaluated for embodied carbon. Previously neglected, embodied carbon associated with probable seismic damage is included. Furthermore, the accounting and consideration of embodied carbon in the design and construction of two actual buildings are described. Finally, embodied carbon limits for structural systems considering material, construction, and probable seismic damage are proposed. It is the hope that these requirements would eventually become standards for the industry.
收起
原文获取