This article is concerned with the design of two sliding mode controllers for the robust tracking control of a class of uncertain systems with linear nominal part and perturbations (disturbances, uncertainties and non...
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With the evolution of technology since the last decade, smart appliances are now the trend in most developed countries and soon will be a part of a typical user all over the world. The phenomenon of the smart grid all...
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In response to the contradiction between the control accuracy and system efficiency in traditional electro-hydraulic servo systems, this paper proposes a series-connected pump-valve composite control system and invest...
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Analyzing website performance is crucial for optimizing a site's functionality, enhancing user engagement, and aligning with business goals. This evaluation focuses on essential metrics such as average engagement ...
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Brain tumor is one of the most deadly diseases today. Early identification is the key in treatment and automated method of image classification can help in this process. But, there are significant obstacles in precise...
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Since the first use of computers in space and aircraft, software errors have occurred. These errors can manifest as loss-of-life or less catastrophically. As the demand for automation increases, software in mission or...
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ISBN:
(纸本)9798350304626
Since the first use of computers in space and aircraft, software errors have occurred. These errors can manifest as loss-of-life or less catastrophically. As the demand for automation increases, software in mission or safety-critical systems should be designed to be tolerant to the most likely software faults. This paper categorizes a set of 56 historic aerospace software error incidents from 1962 to 2023 to determine trends of how and where automation is most likely to fail or behave unexpectedly. A distinction between software producing unexpected (erroneous) output versus no output (fail-silent) is introduced. Of the historical incidents analyzed, 86% were from software producing wrong output rather than simply stopping. Rebooting was found to be ineffective to clear erroneous behavior, and not reliable to recover from silent failures. Error origin was within the code/logic itself in 59% of cases, 16% from configurable data, 14% from unexpected sensor input, and 11% from command/operator input. A substantial forty percent (41%) of unexpected software behavior was indicated by the absence of code, arising from unanticipated situations and missing requirements, and 18% of incidents were subjectively deemed "unknown-unknowns". No incidents were found to be the result of programming language, compiler, tool, or operating system;and only eighteen percent (18%) of all incidents were considered traditional computer science/programming-related in nature. These findings indicate that for fault tolerance, erroneous automation behavior must be a primary consideration especially at critical moments, and reboot recoverability may not be viable. Based on this data, we recommend some best practices for pre-flight software error prevention and in-flight error mitigation. Care should be taken to validate configurable data and commands prior to use. "Test-like-you-fly", including hardware-in-the-loop combined with robust off-nominal testing should be used to uncover missing logic
In response to the problem of high amplitude common mode voltage (CMV) in the third harmonic injection two-stage matrix converter (3TSMC), the CMV suppression methods of active zero state PWM (AZSPWM) and near-state P...
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The paper deals with the problem of cooperatively finding a source of an unknown environmental field by a relatively small group of robots whose communication range is finite. To solve this problem, a distributed cont...
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As complementary methods to classical model-based control, data-driven control methods can avoid modeling the dynamics of complex systems but achieve good control performance, hence, data-driven control methods are gr...
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Underground mines can use the Internet of Things to monitor the environment, safety, and productivity by installing sensors that detect temperature, moisture content, and gas levels in real time. These sensors collect...
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