Thermal spraying has reached a status of its own technical discipline in engineering and become an important industrial technology in China. This paper deals with the latest developments of thermal spraying equipment ...Thermal spraying has reached a status of its own technical discipline in engineering and become an important industrial technology in China. This paper deals with the latest developments of thermal spraying equipment and processes as well as their application in China in recent years. In addition, five kinds of powders were used for plasma spraying to renovate worn parts of heavyduty vehicles and a simple and convenient optimizing method for process parameters of plasma spraying was studied. As a result, the service lives of renovated parts by plasma spraying were increased 2.77 to 8.33 times and an existence of a practical power input Wo was confirmed.展开更多
Condition monitoring is increasingly used to anticipate and detect failures of industrial machines.Failures of machines can cause high maintenance or replacement costs.If neglected,it may result in catastrophic accide...Condition monitoring is increasingly used to anticipate and detect failures of industrial machines.Failures of machines can cause high maintenance or replacement costs.If neglected,it may result in catastrophic accidents leading to production shrinkage.The potential failure would negatively affect the profitability of the company,including production shut down,cost of spare parts,cost of labor,damage of reputation,risk of injury to people and the environment.In recent years,condition-based maintenance( CBM) and prognostic and health management( PHM) are developed and formed a strong connection among science,engineering,computer,reliability,communication,management,etc.Computerized maintenance management systems( CMMS) store a lot of data regarding the fault diagnosis and life prediction of the machinery equipment.It's too necessary to uncover useful knowledge from the huge amount of data.It's vital to find the ways to obtain useful and concise information from these data.This information can be of great influence in the decision making of managers.This article is a review of intelligent approaches in machinery faults diagnosis and prediction based on PHM and CBM.展开更多
Wise maintenance-procedures are essential for achieving high industrial productivities and low energy expenditure. A major part of the energy used in any production process is expended during the maintenance of the em...Wise maintenance-procedures are essential for achieving high industrial productivities and low energy expenditure. A major part of the energy used in any production process is expended during the maintenance of the employed equipment. To ensure plant reliability and equipment availability, a condition-based maintenance policy has been developed in this investigation. In particular, this project explored the use of vibration parameters in the diagnosis of equipment failure. A computer-based diagnostic tool employing an artificial neural-network (ANN) was developed to analyse the ensuing machinery faults, their causes and consequences. For various categories of this type of machinery, a vibration-severity chart (ISO 12372 / BS 4675: 1971) appropriately colour coded according to defined mechanical faults, was used in training of the ANN. The model was validated using data obtained from a centrifugal pump on full load and fed into the program written in Visual Basic. The results revealed that, for centrifugal pumps within 15 to 300kw power range, vibration-velocity amplitude of between 0.9 and 2.7mm/s was within acceptable limits. When the values rose to between 2.8 and 7.0mm/s, closer monitoring and improved understanding of the equipment condition was needed. The evolved diagnostic and prognostic model is applicable for other rotary equipment that is used within the same power limits.展开更多
In the daily operation process of airlines,aviation machinery maintenance and inspection work play an important role.At present,the quality of life of the people in our country is constantly improving.In daily travel,...In the daily operation process of airlines,aviation machinery maintenance and inspection work play an important role.At present,the quality of life of the people in our country is constantly improving.In daily travel,we have not only used cars,trains and other means of transportation,but also started to choose airplanes as the first choice in a higher frequency.In recent years,with the improvement of living standards,more and more people choose to travel during holidays.Therefore,the traffic volume of aviation aircraft is increasing year by year,but it also increases the risk of aviation aircraft failure,so it is particularly important to do a good job in the maintenance and inspection of aviation machinery.In this paper,according to the current situation of aviation machinery maintenance and inspection,put forward targeted improvement measures to ensure the safety and stability of China's aviation aircraft operation.展开更多
文摘Thermal spraying has reached a status of its own technical discipline in engineering and become an important industrial technology in China. This paper deals with the latest developments of thermal spraying equipment and processes as well as their application in China in recent years. In addition, five kinds of powders were used for plasma spraying to renovate worn parts of heavyduty vehicles and a simple and convenient optimizing method for process parameters of plasma spraying was studied. As a result, the service lives of renovated parts by plasma spraying were increased 2.77 to 8.33 times and an existence of a practical power input Wo was confirmed.
基金Fundamental Research Funds for the Central Universities,China(No.DUT17GF214)
文摘Condition monitoring is increasingly used to anticipate and detect failures of industrial machines.Failures of machines can cause high maintenance or replacement costs.If neglected,it may result in catastrophic accidents leading to production shrinkage.The potential failure would negatively affect the profitability of the company,including production shut down,cost of spare parts,cost of labor,damage of reputation,risk of injury to people and the environment.In recent years,condition-based maintenance( CBM) and prognostic and health management( PHM) are developed and formed a strong connection among science,engineering,computer,reliability,communication,management,etc.Computerized maintenance management systems( CMMS) store a lot of data regarding the fault diagnosis and life prediction of the machinery equipment.It's too necessary to uncover useful knowledge from the huge amount of data.It's vital to find the ways to obtain useful and concise information from these data.This information can be of great influence in the decision making of managers.This article is a review of intelligent approaches in machinery faults diagnosis and prediction based on PHM and CBM.
文摘Wise maintenance-procedures are essential for achieving high industrial productivities and low energy expenditure. A major part of the energy used in any production process is expended during the maintenance of the employed equipment. To ensure plant reliability and equipment availability, a condition-based maintenance policy has been developed in this investigation. In particular, this project explored the use of vibration parameters in the diagnosis of equipment failure. A computer-based diagnostic tool employing an artificial neural-network (ANN) was developed to analyse the ensuing machinery faults, their causes and consequences. For various categories of this type of machinery, a vibration-severity chart (ISO 12372 / BS 4675: 1971) appropriately colour coded according to defined mechanical faults, was used in training of the ANN. The model was validated using data obtained from a centrifugal pump on full load and fed into the program written in Visual Basic. The results revealed that, for centrifugal pumps within 15 to 300kw power range, vibration-velocity amplitude of between 0.9 and 2.7mm/s was within acceptable limits. When the values rose to between 2.8 and 7.0mm/s, closer monitoring and improved understanding of the equipment condition was needed. The evolved diagnostic and prognostic model is applicable for other rotary equipment that is used within the same power limits.
文摘In the daily operation process of airlines,aviation machinery maintenance and inspection work play an important role.At present,the quality of life of the people in our country is constantly improving.In daily travel,we have not only used cars,trains and other means of transportation,but also started to choose airplanes as the first choice in a higher frequency.In recent years,with the improvement of living standards,more and more people choose to travel during holidays.Therefore,the traffic volume of aviation aircraft is increasing year by year,but it also increases the risk of aviation aircraft failure,so it is particularly important to do a good job in the maintenance and inspection of aviation machinery.In this paper,according to the current situation of aviation machinery maintenance and inspection,put forward targeted improvement measures to ensure the safety and stability of China's aviation aircraft operation.
