摘要 :
Traditional aircraft certification processes pose difficulties due to their document-centric nature, out-dated reference, and equipment specific processes. With emerging technologies and increased system complexity, manufacturers ...
展开
Traditional aircraft certification processes pose difficulties due to their document-centric nature, out-dated reference, and equipment specific processes. With emerging technologies and increased system complexity, manufacturers need to demonstrate compliance with equivalent procedures that are not explicitly described in the regulations. Therefore, a more streamlined certification process is needed to improve efficiency by reducing time and cost without compromising test effectiveness. The goal is to present a streamlined process for certification utilizing a model-based verification through integration of system design model and current industry certification processes. The presented approach is demonstrated through a verification of a system under test (SUT), a transport-type aircraft block model, and a system verification model for the Federal Aviation Administration (FAA) 14 CFR Part 36 Noise Standards as a component of aircraft Type Certification. Both the aircraft and verification model are based on model-based systems engineering (MBSE) and utilizes systems modeling language (SysML). In order to implement the model into current practice of transport-type certification, the paper captures findings and inputs obtained by aircraft manufacturers, translates regulations to requirements, constrains requirements through modeled current procedures, verifies the SUT based on the constraints, and outputs the results as artifacts utilized in current certification process. The MBSE model also utilizes a Monte-Carlo Markov Chain simulation to aide the user in the selection process of equivalent procedural options. It refines the concept of the improvement process with programmatic metrics that stakeholders can utilize to compare between equivalent procedures for aircraft certification.
收起
摘要 :
Traditional aircraft certification processes pose difficulties due to their document-centric nature, out-dated reference, and equipment specific processes. With emerging technologies and increased system complexity, manufacturers ...
展开
Traditional aircraft certification processes pose difficulties due to their document-centric nature, out-dated reference, and equipment specific processes. With emerging technologies and increased system complexity, manufacturers need to demonstrate compliance with equivalent procedures that are not explicitly described in the regulations. Therefore, a more streamlined certification process is needed to improve efficiency by reducing time and cost without compromising test effectiveness. The goal is to present a streamlined process for certification utilizing a model-based verification through integration of system design model and current industry certification processes. The presented approach is demonstrated through a verification of a system under test (SUT), a transport-type aircraft block model, and a system verification model for the Federal Aviation Administration (FAA) 14 CFR Part 36 Noise Standards as a component of aircraft Type Certification. Both the aircraft and verification model are based on model-based systems engineering (MBSE) and utilizes systems modeling language (SysML). In order to implement the model into current practice of transport-type certification, the paper captures findings and inputs obtained by aircraft manufacturers, translates regulations to requirements, constrains requirements through modeled current procedures, verifies the SUT based on the constraints, and outputs the results as artifacts utilized in current certification process. The MBSE model also utilizes a Monte-Carlo Markov Chain simulation to aide the user in the selection process of equivalent procedural options. It refines the concept of the improvement process with programmatic metrics that stakeholders can utilize to compare between equivalent procedures for aircraft certification.
收起
摘要 :
Traditional aircraft certification processes pose difficulties due to their document-centric nature, out-dated reference, and equipment specific processes. With emerging technologies and increased system complexity, manufacturers ...
展开
Traditional aircraft certification processes pose difficulties due to their document-centric nature, out-dated reference, and equipment specific processes. With emerging technologies and increased system complexity, manufacturers need to demonstrate compliance with equivalent procedures that are not explicitly described in the regulations. Therefore, a more streamlined certification process is needed to improve efficiency by reducing time and cost without compromising test effectiveness. The goal is to present a streamlined process for certification utilizing a model-based verification through integration of system design model and current industry certification processes. The presented approach is demonstrated through a verification of a system under test (SUT), a transport-type aircraft block model, and a system verification mode) for the Federal Aviation Administration (FAA) 14 CFR Part 36 Noise Standards as a component of aircraft Type Certification. Both the aircraft and verification model are based on model-based systems engineering (MBSE) and utilizes systems modeling language (SysML). In order to implement the model into current practice of transport-type certification, the paper captures findings and inputs obtained by aircraft manufacturers, translates regulations to requirements, constrains requirements through modeled current procedures, verifies the SUT based on the constraints, and outputs the results as artifacts utilized in current certification process. The MBSE model also utilizes a Monte-Carlo Markov Chain simulation to aide the user in the selection process of equivalent procedural options. It refines the concept of the improvement process with programmatic metrics that stakeholders can utilize to compare between equivalent procedures for aircraft certification.
收起
摘要 :
The model-based design process consists of defining a system's set of requirements, functional, logical, and physical (RFLP) compositions within a model-centric framework. In order for this approach to become adopted for transport...
展开
The model-based design process consists of defining a system's set of requirements, functional, logical, and physical (RFLP) compositions within a model-centric framework. In order for this approach to become adopted for transport aircraft design and manufacturing, the aircraft certification process must become integrated into the model-based approach. This paper demonstrates the management of certification requirements and artifacts through the development of a digital thread within a Model-Based Systems Engineering (MBSE) environment. This study builds upon the existing relationships of model elements built into Systems Modeling Language (SysML) in MagicDraw to capture specific types of verification methods to satisfy certification requirements with appropriate means of compliance. Additionally, document-based artifacts are generated from the design model that is standard for present-day certification of transport type aircraft by the Federal Aviation Administration (FAA) such as a requirement report and compliance matrix. This digital thread capability is displayed on a notional powerplant system adhering to the 14 CFR Part 25 - Subpart E regulations.
收起
摘要 :
In order to apply an effective noise reduction treatment determining the contribution of different engine components to the total sound perceived inside the cabin is important. Although accelerometer or laser based vibration tests...
展开
In order to apply an effective noise reduction treatment determining the contribution of different engine components to the total sound perceived inside the cabin is important. Although accelerometer or laser based vibration tests are usually performed, the sound contributions are not always captured accurately with such approaches. Microphone based methods are strongly influenced by the many reflections and other sound sources inside the engine bay. Recently, it has been shown that engine radiation can be effectively measured using microphones combined with particle velocity sensors while the engine remains mounted in the car [6]. Similar results were obtained as with a dismounted engine in an anechoic room. This paper focusses on the measurement of the transfer path from the engine to the vehicle interior in order to calculate the sound pressure contribution of individual engine sections at the listener's position. To achieve a good signal to noise ratio during acoustic transfer paths a novel monopole loudspeaker was designed. The measurement method and monopole sound source are presented along with results of a validation test.
收起
摘要 :
This paper investigates the abnormal electromagnetic noise of hybrid electric vehicle(HEV) traction motor due to vibration of permanent magnet. In the paper, we introduce the mechanical and electromagnetic factor of magnetic unbal...
展开
This paper investigates the abnormal electromagnetic noise of hybrid electric vehicle(HEV) traction motor due to vibration of permanent magnet. In the paper, we introduce the mechanical and electromagnetic factor of magnetic unbalance of the HEV traction motor and analyze the harmonic order of abnormal electromagnetic noise due to magnetic unbalance. We determine the characteristics of the abnormal electromagnetic noise is experimentally caused by the vibration of permanent magnet. And we improve the magnet fixing method of HEV traction motor and reduce the abnormal electromagnetic noise of HEV traction motor.
收起
摘要 :
This paper investigates the abnormal electromagnetic noise of hybrid electric vehicle(HEV) traction motor due to vibration of permanent magnet. In the paper, we introduce the mechanical and electromagnetic factor of magnetic unbal...
展开
This paper investigates the abnormal electromagnetic noise of hybrid electric vehicle(HEV) traction motor due to vibration of permanent magnet. In the paper, we introduce the mechanical and electromagnetic factor of magnetic unbalance of the HEV traction motor and analyze the harmonic order of abnormal electromagnetic noise due to magnetic unbalance. We determine the characteristics of the abnormal electromagnetic noise is experimentally caused by the vibration of permanent magnet. And we improve the magnet fixing method of HEV traction motor and reduce the abnormal electromagnetic noise of HEV traction motor.
收起
原文获取