Ruizhe

A coupled failure mode and effects analysis method for hardware-software failure interactions in embedded systems of intelligent equipment Abstraction Failure mode and effects analysis (FMEA) is an effective risk prevention and control method that has been widely applied across various domains to identify potential failures and enhance system reliability. However, conventional FMEA methods often analyze software and hardware failures in isolation, making it difficult to adequately identify or a ...

A modeling and simulation framework for the study and analysis of cascading failures in satellite networks Abstraction Satellite networks are inherently susceptible to cascading failures due to resource constraints, complex environments, and limited protection mechanisms. Existing studies have explored this issue from various perspectives; however, significant differences in the key modeling factors considered often lead to models that do not fully capture satellite network characteristics. Thi ...

A novel event tree analysis-graphical evaluation and review technique network model for comprehensive fault analysis in rocket hydrogen-oxygen refueling Abstraction Rocket hydrogen-oxygen refueling is a safety-critical pre-launch process with multiple tightly coupled subsystems under extreme cryogenic and high-pressure conditions. Traditional event tree analysis (ETA) has four key limitations: decoupled probability-time modeling, topological redundancy from rigid linear branching, inability to ...

AADL-Based safety analysis using formal methods applied to aircraft digital systems Abstraction Model-based engineering tools are increasingly being used for system-level development of safety-critical systems. Architectural and behavioral models provide important information that can be leveraged to improve the system safety analysis process. Model-based design artifacts produced in early stage development activities can be used to perform system safety analysis, reducing costs, and providing ...

Failure mode and effect analysis improvement: A systematic literature review and future research agenda Abstraction Failure mode and effects analysis (FMEA) is a reliability management technique commonly utilized in various industries to guarantee the security and reliability of systems, services and projects. Nonetheless, the classical risk priority number (RPN) method has been criticized for many inherent deficiencies in the literature. Over the last decades, plenty of models and approaches h ...

Modeling of Satellite Constellation in Modelica and a PHM System Framework Driven by Model Data Hybrid Abstraction The new generation of low-earth-orbit (LEO) satellite constellation systems has the characteristics of low delay, strong signal and global coverage, and it is an important direction for the development of next-generation communication technology. A major disadvantage is that the constellation system is huge, often composed of hundreds or thousands of satellites, which puts forward ...

Inclusion of Reliability and Safety Analysis Methods in Modelica Abstraction A method is developed to combine techniques of reliability and safety analysis with the Modelica language, which is now widely used for the modelling and simulation of technical systems. The method allows to perform a reliability or safety analysis on the system model that is created and used for simulation studies. The procedure automatically determines the so called minimal path sets or minimal cut sets of a system, ...

Guided simulation for dynamic probabilistic risk assessment of complex systems: Concept, method, and application Abstraction Probabilistic risk assessment (PRA) is a systematic process of examining how engineered systems work to ensure safety. With the growth of the size of dynamic systems and the complexity of the interactions between hardware, software, and humans, it is extremely difficult to enumerate risky scenarios by the traditional PRA methods. In this study, a new dynamic probabilistic ...

Simple analysis of complex system safety based on Finite State Machine Network and phase space theory Abstraction Safety analysis of complex systems, such as aero-engines, has always been a challenging problem. In particular, the risk propagation caused by system functional interactions has become increasingly prominent, leading to the difficulty of traditional safety analysis methods. Existing methods are mostly based on manual experience and deduction with difficulty to completely analyze the ...

Model-based safety analysis with time resolution (MBSA-TR) method for complex aerothermal-mechanical systems of aero-engines Abstraction Current aero-engine safety assessments mostly rely on experience-based safety analysis methods such as Fault Tree Analysis (FTA) or Failure Modes and Effects Analysis (FMEA). The progressively significant dynamic characteristics of aero-engines during their transition between states render these methods incapable of providing accurate quantitative safety guida ...