为解决某批次纯电动车型行驶中突发动力中断故障问题,本文以该车型高压正极继电器失效案例为研究对象,通过诊断仪数据采集、部件对比试验、系统环境排查等方法,明确故障根本原因为继电器触点氧化粘连与机械卡滞。高压配电单元(Power Dis...为解决某批次纯电动车型行驶中突发动力中断故障问题,本文以该车型高压正极继电器失效案例为研究对象,通过诊断仪数据采集、部件对比试验、系统环境排查等方法,明确故障根本原因为继电器触点氧化粘连与机械卡滞。高压配电单元(Power Distribution Unit,PDU)密封缺陷导致潮气侵入,引发触点电解氧化及接触点电阻增大,高温环境加剧氧化循环进而造成触点粘连;支架吸潮膨胀与杂质堆积则导致机械卡滞。针对上述问题,本文提出“部件升级+结构优化+程序改进”的综合应对方案,包括更换抗氧化触点继电器、升级PDU密封构件、优化整车控制器VCU控制逻辑。整改结果显示,继电器电寿命提升66.7%,相关故障实现“零投诉”,验证了该方案的有效性。展开更多
BACKGROUND:Stent migration in the hepatopancreatic duct might arise as one of the rare complications associated with biliary or pancreatic stenting.Although there are some procedures to retrieve the migrated stent,inc...BACKGROUND:Stent migration in the hepatopancreatic duct might arise as one of the rare complications associated with biliary or pancreatic stenting.Although there are some procedures to retrieve the migrated stent,including surgical,percutaneous,and endoscopic approaches,endoscopy should be attempted first because it is least invasive.This study set out to evaluate the usefulness of endoscopic retrieval of migrated biliary and pancreatic stents.METHODS:Plastic stents that migrated in the bile duct(35 patients)or pancreatic duct(2)were retrieved with endoscopic retrograde cholangiopancreatography.Devices used were snare forceps,a basket catheter,grasping forceps,biopsy forceps,a balloon catheter,and the Soehendra stent retriever.RESULTS:Endoscopic retrieval of migrated stents was performed successfully in 36(97.0%)of the 37 patients.The devices utilized for successful treatment were basket catheter(13 patients),grasping forceps(10),snare forceps(8),balloon catheter(3),biopsy forceps(1),and the Soehendra stent retriever(1).The unsuccessfully treated patient with chronic pancreatitis underwent surgery since the guide wire did not move forward due to bile duct stenosis,and there was also duodenal stenosis.One patient developed mild pancreatitis after withdrawal of the stent;the pancreatitis was relieved with conservative treatment.CONCLUSIONS:Endoscopic retrieval of migrated biliary and pancreatic stents appears to be useful because of its safety and low invasiveness.However,various forceps should be prepared for the retrieval of a migrated stent.展开更多
A digitally controlled three-dimensional gamma-scanning apparatuswas developed and used to trou- bleshoot distillation column is thepresent investigation. In a 140 mm (ID) model column, variousmalfunctional phenomena,...A digitally controlled three-dimensional gamma-scanning apparatuswas developed and used to trou- bleshoot distillation column is thepresent investigation. In a 140 mm (ID) model column, variousmalfunctional phenomena, both rate and process related conditions andstructural problems, which may be frequently encountered in theoperation of tray and packing columns, were experimentally simulatedand tested with the developed scan- ning system. The experimentalresults showed that the scanning spectra can fairly reflect thesimulated phenomena.展开更多
A new troubleshooting algorithm for solving assignment problem based on existing algorithms is proposed, and an analysis on the related theory is given. By applying the new troubleshooting algorithm to the Lagrange re...A new troubleshooting algorithm for solving assignment problem based on existing algorithms is proposed, and an analysis on the related theory is given. By applying the new troubleshooting algorithm to the Lagrange relaxation algorithm of the multi-dimensional assignment problem of data association for multi-passive-sensor multi-target location systems, and comparing the simulation results with that of the Hungarian algorithm which is the classical optimal solving algorithm, and the multi-layer ordersearching algorithm which is a sub-optimal solving algorithm, the performance and applying conditions of the new algorithm are summarized. Theory analysis and simulation results prove the effectiveness and superiority of the new algorithm.展开更多
A new method for the fast detection and evaluation of optimization potentials for separation processes is presented within this work. The method disclaims the application of difficult rigorous mathematical optimizatio...A new method for the fast detection and evaluation of optimization potentials for separation processes is presented within this work. The method disclaims the application of difficult rigorous mathematical optimization techniques by a number of different smart workarounds. The basis for the optimization is the application of different heuristics, shortcut methods and simulation studies. The method was applied to a real process in which the overall yield was improved of about 58%. Due to the new configuration an alternative control scheme containing unusual control loops was implemented.展开更多
Gamma scanning is one of the most common nuclear techniques on troubleshooting industrial equipments like distillation columns and reactors. With a very simple concept, the technique is easy to implement. Searching fo...Gamma scanning is one of the most common nuclear techniques on troubleshooting industrial equipments like distillation columns and reactors. With a very simple concept, the technique is easy to implement. Searching for a competitive edge the industry has been long developing solutions to achieve better results. On the last decades, significant development has been done with the advent of new equipments, electronics, portable computers and software. Continuous scanning and wireless detection systems are examples of successful field solutions, while new software aid on reporting and data presentation. However the type and quality of the results itself has not dramatically changed since its beginning. A scan profile is simple to understand, although the process to build it can be very complex as it requires a specific blend of knowledge and abilities. Process engineering, chemical engineering, internal hydraulic project, nuclear engineering and field abilities are pre requisites for of any scan specialist. Correct data gathering, interpretation and reporting are abilities often difficult to match or requires a long time of training. The industry faces a similar difficult on the customer side, as it is always necessary to train end users to understand a report and how to use its best. This paper describes our effort on developing a new approach on the gamma scan test using image reconstruction techniques that would result on a graphic image rather than a XY plot. Direct and easier to understand, a report with graphic images would be also be accessible to a wider audience, not limited to the customers experienced with gamma scan interpretation.展开更多
With the acceleration of China's modernization, infrastructure construction is affecting the development of China's national economy. China's construction of water conservancy projects continues to increas...With the acceleration of China's modernization, infrastructure construction is affecting the development of China's national economy. China's construction of water conservancy projects continues to increase, which ushered in an opportunity for water conservancy construction. As the construction of water conservancy projects has certain complexity and systematic characteristics, the process is complicated, and the construction involves various aspects, which also means that failure problems will inevitably occur during the operation of water conservancy projects, especially the failure of automation systems is the most common, which will have a serious impact on the operation efficiency, ability and level of water conservancy projects. Therefore, corresponding troubleshooting measures must be taken, and regular and regular inspection and investigation should be carried out. Through the established algorithm and so on, the hydraulic engineering automation control system fault is eliminated, the initial fault signal of the automation control system is mined, the fault type of the automation system is effectively identified, and based on the mastery of the fault cause, a targeted fault elimination instruction is adopted. Based on this, the analysis is carried out around the automation system of water conservancy projects, and the troubleshooting strategies of the system are explored to maintain the safe operation of the whole water conservancy project, improve the application effect of the automation control system, promote the continuity of the operation of the automation control system, provide references and suggestions for the troubleshooting of the automation control of water conservancy projects, and optimize the troubleshooting methods so as to effectively eliminate the faults.展开更多
文摘为解决某批次纯电动车型行驶中突发动力中断故障问题,本文以该车型高压正极继电器失效案例为研究对象,通过诊断仪数据采集、部件对比试验、系统环境排查等方法,明确故障根本原因为继电器触点氧化粘连与机械卡滞。高压配电单元(Power Distribution Unit,PDU)密封缺陷导致潮气侵入,引发触点电解氧化及接触点电阻增大,高温环境加剧氧化循环进而造成触点粘连;支架吸潮膨胀与杂质堆积则导致机械卡滞。针对上述问题,本文提出“部件升级+结构优化+程序改进”的综合应对方案,包括更换抗氧化触点继电器、升级PDU密封构件、优化整车控制器VCU控制逻辑。整改结果显示,继电器电寿命提升66.7%,相关故障实现“零投诉”,验证了该方案的有效性。
文摘BACKGROUND:Stent migration in the hepatopancreatic duct might arise as one of the rare complications associated with biliary or pancreatic stenting.Although there are some procedures to retrieve the migrated stent,including surgical,percutaneous,and endoscopic approaches,endoscopy should be attempted first because it is least invasive.This study set out to evaluate the usefulness of endoscopic retrieval of migrated biliary and pancreatic stents.METHODS:Plastic stents that migrated in the bile duct(35 patients)or pancreatic duct(2)were retrieved with endoscopic retrograde cholangiopancreatography.Devices used were snare forceps,a basket catheter,grasping forceps,biopsy forceps,a balloon catheter,and the Soehendra stent retriever.RESULTS:Endoscopic retrieval of migrated stents was performed successfully in 36(97.0%)of the 37 patients.The devices utilized for successful treatment were basket catheter(13 patients),grasping forceps(10),snare forceps(8),balloon catheter(3),biopsy forceps(1),and the Soehendra stent retriever(1).The unsuccessfully treated patient with chronic pancreatitis underwent surgery since the guide wire did not move forward due to bile duct stenosis,and there was also duodenal stenosis.One patient developed mild pancreatitis after withdrawal of the stent;the pancreatitis was relieved with conservative treatment.CONCLUSIONS:Endoscopic retrieval of migrated biliary and pancreatic stents appears to be useful because of its safety and low invasiveness.However,various forceps should be prepared for the retrieval of a migrated stent.
基金the Department of Research and Development, SINOPEC.
文摘A digitally controlled three-dimensional gamma-scanning apparatuswas developed and used to trou- bleshoot distillation column is thepresent investigation. In a 140 mm (ID) model column, variousmalfunctional phenomena, both rate and process related conditions andstructural problems, which may be frequently encountered in theoperation of tray and packing columns, were experimentally simulatedand tested with the developed scan- ning system. The experimentalresults showed that the scanning spectra can fairly reflect thesimulated phenomena.
基金supported by the National Natural Science Foundation of China(61170161)the Natural Science Foundation of S handong (ZR2009GM002)the Technology Projects of Shandong University (J09LG01)
文摘A new troubleshooting algorithm for solving assignment problem based on existing algorithms is proposed, and an analysis on the related theory is given. By applying the new troubleshooting algorithm to the Lagrange relaxation algorithm of the multi-dimensional assignment problem of data association for multi-passive-sensor multi-target location systems, and comparing the simulation results with that of the Hungarian algorithm which is the classical optimal solving algorithm, and the multi-layer ordersearching algorithm which is a sub-optimal solving algorithm, the performance and applying conditions of the new algorithm are summarized. Theory analysis and simulation results prove the effectiveness and superiority of the new algorithm.
文摘A new method for the fast detection and evaluation of optimization potentials for separation processes is presented within this work. The method disclaims the application of difficult rigorous mathematical optimization techniques by a number of different smart workarounds. The basis for the optimization is the application of different heuristics, shortcut methods and simulation studies. The method was applied to a real process in which the overall yield was improved of about 58%. Due to the new configuration an alternative control scheme containing unusual control loops was implemented.
文摘Gamma scanning is one of the most common nuclear techniques on troubleshooting industrial equipments like distillation columns and reactors. With a very simple concept, the technique is easy to implement. Searching for a competitive edge the industry has been long developing solutions to achieve better results. On the last decades, significant development has been done with the advent of new equipments, electronics, portable computers and software. Continuous scanning and wireless detection systems are examples of successful field solutions, while new software aid on reporting and data presentation. However the type and quality of the results itself has not dramatically changed since its beginning. A scan profile is simple to understand, although the process to build it can be very complex as it requires a specific blend of knowledge and abilities. Process engineering, chemical engineering, internal hydraulic project, nuclear engineering and field abilities are pre requisites for of any scan specialist. Correct data gathering, interpretation and reporting are abilities often difficult to match or requires a long time of training. The industry faces a similar difficult on the customer side, as it is always necessary to train end users to understand a report and how to use its best. This paper describes our effort on developing a new approach on the gamma scan test using image reconstruction techniques that would result on a graphic image rather than a XY plot. Direct and easier to understand, a report with graphic images would be also be accessible to a wider audience, not limited to the customers experienced with gamma scan interpretation.
文摘With the acceleration of China's modernization, infrastructure construction is affecting the development of China's national economy. China's construction of water conservancy projects continues to increase, which ushered in an opportunity for water conservancy construction. As the construction of water conservancy projects has certain complexity and systematic characteristics, the process is complicated, and the construction involves various aspects, which also means that failure problems will inevitably occur during the operation of water conservancy projects, especially the failure of automation systems is the most common, which will have a serious impact on the operation efficiency, ability and level of water conservancy projects. Therefore, corresponding troubleshooting measures must be taken, and regular and regular inspection and investigation should be carried out. Through the established algorithm and so on, the hydraulic engineering automation control system fault is eliminated, the initial fault signal of the automation control system is mined, the fault type of the automation system is effectively identified, and based on the mastery of the fault cause, a targeted fault elimination instruction is adopted. Based on this, the analysis is carried out around the automation system of water conservancy projects, and the troubleshooting strategies of the system are explored to maintain the safe operation of the whole water conservancy project, improve the application effect of the automation control system, promote the continuity of the operation of the automation control system, provide references and suggestions for the troubleshooting of the automation control of water conservancy projects, and optimize the troubleshooting methods so as to effectively eliminate the faults.
