With the development of electronic equipment to high accuracy, high density, high frequency, and atrocious ser- vice environment, the functional surface in this type of equipment has increasingly serious problems,
The General Ad- T ministration of Quality Supervision, Inspection andQuarantine of P. R.China (AQSIQ) issued a notice on May 28, 2007, requiring various locations torectify their procedures for checking special equipm...The General Ad- T ministration of Quality Supervision, Inspection andQuarantine of P. R.China (AQSIQ) issued a notice on May 28, 2007, requiring various locations torectify their procedures for checking special equipment and hoisting machines for hidden problems.To further clarify and implement responsibility in the safety management of special equipment inenterprises, inspection responsibilities and test organizations related to technical assurance areto be established.展开更多
The health monitoring has been studied to ensure integrity of design of engine structure by detection,quantification,and prediction of damages.Early detection of faults may allow the downtime of maintenance to be resc...The health monitoring has been studied to ensure integrity of design of engine structure by detection,quantification,and prediction of damages.Early detection of faults may allow the downtime of maintenance to be rescheduled,thus preventing sudden shutdown of machines.In cylinder pressure developed,vibrations and noise emissions data provide a rich source of information about condition of engines.Monitoring of vibrations and noise emissions are novel non-intrusive methodologies for which positioning of various transducers are important issue.The presented work shows applicability of these diagnosis methodologies adopted in case of diesel engines.The effects of changing various fuel injection parameters was analyzed.Scope of using non-intrusive technique has been analyzed by changing locations of microphone.Novelty of this worklies in exploring signal processing methods for various locations around the engine test set up.Various frequency ranges of contributing noise and vibration sources were identified.Time-Frequency analysis showed the onset of various cyclic.Based on the identification of various frequency bands,it is possible to device suitable filters in order to extract more information.展开更多
文摘With the development of electronic equipment to high accuracy, high density, high frequency, and atrocious ser- vice environment, the functional surface in this type of equipment has increasingly serious problems,
文摘The General Ad- T ministration of Quality Supervision, Inspection andQuarantine of P. R.China (AQSIQ) issued a notice on May 28, 2007, requiring various locations torectify their procedures for checking special equipment and hoisting machines for hidden problems.To further clarify and implement responsibility in the safety management of special equipment inenterprises, inspection responsibilities and test organizations related to technical assurance areto be established.
文摘The health monitoring has been studied to ensure integrity of design of engine structure by detection,quantification,and prediction of damages.Early detection of faults may allow the downtime of maintenance to be rescheduled,thus preventing sudden shutdown of machines.In cylinder pressure developed,vibrations and noise emissions data provide a rich source of information about condition of engines.Monitoring of vibrations and noise emissions are novel non-intrusive methodologies for which positioning of various transducers are important issue.The presented work shows applicability of these diagnosis methodologies adopted in case of diesel engines.The effects of changing various fuel injection parameters was analyzed.Scope of using non-intrusive technique has been analyzed by changing locations of microphone.Novelty of this worklies in exploring signal processing methods for various locations around the engine test set up.Various frequency ranges of contributing noise and vibration sources were identified.Time-Frequency analysis showed the onset of various cyclic.Based on the identification of various frequency bands,it is possible to device suitable filters in order to extract more information.
