The transmission line tower will be affected by bad weather and artificial subsidence caused by the foundation and other factors in the power transmission.The tower’s tilt and severe deformation will cause the buildi...The transmission line tower will be affected by bad weather and artificial subsidence caused by the foundation and other factors in the power transmission.The tower’s tilt and severe deformation will cause the building to collapse.Many small changes caused the tower’s collapse,but the early staff often could not intuitively notice the changes in the tower’s state.In the current tower online monitoring system,terminal equipment often needs to replace batteries frequently due to premature exhaustion of power.According to the need for real-time measurement of power line tower,this research designed a real-time monitoring device monitoring the transmission tower attitude tilting and foundation state based on the inertial sensor,the acceleration of 3 axis inertial sensor and angular velocity raw data to pole average filtering pre-processing,and then through the complementary filtering algorithm for comprehensive calculation of tilt angle,the system meets the demand for inclined online monitoring of power line poles and towers regarding measurement accuracy,with low cost and power consumption.The optimization multi-sensor cooperative detection and correction measured tilt angle result relative accuracy can reach 1.03%,which has specific promotion and application value since the system has the advantages of unattended and efficient calculation.展开更多
The safety and reliability of mechatronics systems,particularly the high-end,large and key mechatronics equipment in service,can strongly influence on production efficiency,personnel safety,resources and environment.B...The safety and reliability of mechatronics systems,particularly the high-end,large and key mechatronics equipment in service,can strongly influence on production efficiency,personnel safety,resources and environment.Based on the demands of development of modern industries and technologies such as international industry 4.0,Made-in-China 2025 and Internet + and so on,this paper started from revealing the regularity of evolution of running state of equipment and the methods of signal processing of low signal noise ratio,proposed the key information technology of state monitoring and earlyfault-warning for equipment,put forward the typical technical line and major technical content,introduced the application of the technology to realize modern predictive maintenance of equipment and introduced the development of relevant safety monitoring instruments.The technology will play an important role in ensuring the safety of equipment in service,preventing accidents and realizing scientific maintenance.展开更多
Objectives: The study was to determine the impact of using the FreeStyle Libre<sup>TM</sup> flash glucose monitoring system on glycemic control and the rate of events due to diabetes in people with diabete...Objectives: The study was to determine the impact of using the FreeStyle Libre<sup>TM</sup> flash glucose monitoring system on glycemic control and the rate of events due to diabetes in people with diabetes from different types and age groups. Methods: a retrospective cohort chart review study was carried out at three centers in the Taif region in the Kingdom of Saudi Arabia: The study was approved by an accredited centralized institutional review board. Paper or electronic medical records were included for individuals of any age with diabetes (type 1, type 2, gestational diabetes) managed with diet, insulin therapy, or/and oral antihyperglycemic medication and/or non-insulin injection therapy. The primary outcome measure was the laboratory HbA1c level as well as reduction. Secondary outcome measures were frequency of severe hypoglycemia, admission to hospital or ER visit related to diabetes complications, and severe hyperglycemia (DKA or HHS). Results: Data was analyzed from 1695 patients. The average HbA1c before using the flash glucose monitoring system was 9.60% ± 1.44% and 3 months HbA1c after using the FreeStyle Libre<sup>TM</sup> flash glucose monitoring system was 8.70% + 1.45% for a difference of -0.90% ([95% CI -0.92: -0.88];p 65 years, (p-values Conclusion: The benefits of using the FreeStyle Libre<sup>TM</sup> flash glucose monitoring system are self-evident in reducing HbA1c and events due to hyperglycemia or hypoglycemia.展开更多
This paper presented a fuzzy Petri net model to deal with the monitoring of robotic assembly. Based on the fuzzy Petri net model, an efficient composite reasoning mode was proposed to perform fuzzy reasoning automatie...This paper presented a fuzzy Petri net model to deal with the monitoring of robotic assembly. Based on the fuzzy Petri net model, an efficient composite reasoning mode was proposed to perform fuzzy reasoning automatiealy. It can determine whether there exists an antecedent-consequence relationship between two contact states. Furthermore, various types of sensor signals can be converted to the same form of real values between zero and one, and the contradiction among large number, high degree of truth and importance of input conditions can be resolved very well by introducing the weight factors and priorities for sensor signals. Finally, a peg- in-the-hole example was given to illustrate the reasonability and feasibility of the proposed model.展开更多
针对桥梁健康监测系统庞大、维护困难这一问题,以某连续钢桁梁为研究对象,优化关键性指标,搭建大桥健康监测系统,监测内容包括结构特征监测及耐久性监测,建立信号采集与传输、阈值报警等模块,构建大桥精细化BIM+GIS(Building Informatio...针对桥梁健康监测系统庞大、维护困难这一问题,以某连续钢桁梁为研究对象,优化关键性指标,搭建大桥健康监测系统,监测内容包括结构特征监测及耐久性监测,建立信号采集与传输、阈值报警等模块,构建大桥精细化BIM+GIS(Building Information Modeling+Geographic Information System)模型。监测系统实现动态和静态数据综合采集与控制,包括结构应力、结构振动等动态信息及梁体挠度、支座位移、梁端转角、视频等静态信息,系统传感器反馈灵敏,数据采集准确稳定。分析监测数据发现桥梁各监测指标均小于阈值,且具有一定余量,满足桥梁设计要求,桥梁处于安全运行状态。展开更多
区域(如园区或楼宇)综合能源系统(integrated energy system,IES)的多能流源荷协调运行与优化调控潜力评估分析对整体提升能源互联网的能源利用效率、促进可再生能源规模化发展具有重要意义。然而在实际工程中,普遍可获取的是用户IES与...区域(如园区或楼宇)综合能源系统(integrated energy system,IES)的多能流源荷协调运行与优化调控潜力评估分析对整体提升能源互联网的能源利用效率、促进可再生能源规模化发展具有重要意义。然而在实际工程中,普遍可获取的是用户IES与外部能源网络进行能量交换的端口处采集的粗粒度总量运行数据,据此往往难以对用户IES运行状态和特性进行准确分析,无法满足不断提高的IES运行调控需求。对此,以园区电/气/热IES为研究对象,提出基于耦合消元准则的IES非侵入式源荷设备状态联合感知方法,它仅利用在园区与外部电/气/热能源网络进行能量交换的端口处采集到的总量电/气/热运行数据及气象数据,辨识园区内部主要源荷设备的运行状态。总体上,基于IES内部各能源子系统间的耦合特性,按照气-电-热的顺序分别对每个子系统中主体设备的工作状态和(等效)运行功率进行非侵入式辨识。基于实测数据的实验结果表明,所提方法能够以“非侵入”的方式联合感知多能源荷设备的运行状态,精细化辨识园区IES内部主体设备的(等效)功率,具有较强的工程实用性,可为IES的仿真分析和运行决策提供细粒度大数据源。展开更多
为提高燃气电厂直流系统蓄电池荷电状态监控的准确性,实现精准监控目标,开展了蓄电池荷电状态精准监控算法研究。安装传感器,采集蓄电池运行参数;利用算术平均滤波方法,滤除蓄电池噪声数据,输出到指定的存储介质;通过对蓄电池充放电过...为提高燃气电厂直流系统蓄电池荷电状态监控的准确性,实现精准监控目标,开展了蓄电池荷电状态精准监控算法研究。安装传感器,采集蓄电池运行参数;利用算术平均滤波方法,滤除蓄电池噪声数据,输出到指定的存储介质;通过对蓄电池充放电过程中的电流进行积分运算,计算蓄电池使用电量的变化来估算荷电状态;建立蓄电池等效模型,将荷电状态(state of charge,SOC)估算结果与蓄电池充放电特性变化输入到监控中心,反映蓄电池的当前状态,设定SOC报警阈值,监控结果接近或达到报警阈值,则准备触发报警。实验结果表明:该算法应用后,在所有荷电状态下的SOC监控值均更接近实际值,监控精度较高。展开更多
基金This work was supported by the National Natural Science Foundation of China(Nos.62172242,51901152)Industry University Cooperation Education Program of the Ministry of Education(No.2020021680113)Shanxi Scholarship Council of China.
文摘The transmission line tower will be affected by bad weather and artificial subsidence caused by the foundation and other factors in the power transmission.The tower’s tilt and severe deformation will cause the building to collapse.Many small changes caused the tower’s collapse,but the early staff often could not intuitively notice the changes in the tower’s state.In the current tower online monitoring system,terminal equipment often needs to replace batteries frequently due to premature exhaustion of power.According to the need for real-time measurement of power line tower,this research designed a real-time monitoring device monitoring the transmission tower attitude tilting and foundation state based on the inertial sensor,the acceleration of 3 axis inertial sensor and angular velocity raw data to pole average filtering pre-processing,and then through the complementary filtering algorithm for comprehensive calculation of tilt angle,the system meets the demand for inclined online monitoring of power line poles and towers regarding measurement accuracy,with low cost and power consumption.The optimization multi-sensor cooperative detection and correction measured tilt angle result relative accuracy can reach 1.03%,which has specific promotion and application value since the system has the advantages of unattended and efficient calculation.
基金supported by National Natural Science Foundation of China(No.51275052)Beijing Natural Science Foundation(No.3131002)
文摘The safety and reliability of mechatronics systems,particularly the high-end,large and key mechatronics equipment in service,can strongly influence on production efficiency,personnel safety,resources and environment.Based on the demands of development of modern industries and technologies such as international industry 4.0,Made-in-China 2025 and Internet + and so on,this paper started from revealing the regularity of evolution of running state of equipment and the methods of signal processing of low signal noise ratio,proposed the key information technology of state monitoring and earlyfault-warning for equipment,put forward the typical technical line and major technical content,introduced the application of the technology to realize modern predictive maintenance of equipment and introduced the development of relevant safety monitoring instruments.The technology will play an important role in ensuring the safety of equipment in service,preventing accidents and realizing scientific maintenance.
文摘Objectives: The study was to determine the impact of using the FreeStyle Libre<sup>TM</sup> flash glucose monitoring system on glycemic control and the rate of events due to diabetes in people with diabetes from different types and age groups. Methods: a retrospective cohort chart review study was carried out at three centers in the Taif region in the Kingdom of Saudi Arabia: The study was approved by an accredited centralized institutional review board. Paper or electronic medical records were included for individuals of any age with diabetes (type 1, type 2, gestational diabetes) managed with diet, insulin therapy, or/and oral antihyperglycemic medication and/or non-insulin injection therapy. The primary outcome measure was the laboratory HbA1c level as well as reduction. Secondary outcome measures were frequency of severe hypoglycemia, admission to hospital or ER visit related to diabetes complications, and severe hyperglycemia (DKA or HHS). Results: Data was analyzed from 1695 patients. The average HbA1c before using the flash glucose monitoring system was 9.60% ± 1.44% and 3 months HbA1c after using the FreeStyle Libre<sup>TM</sup> flash glucose monitoring system was 8.70% + 1.45% for a difference of -0.90% ([95% CI -0.92: -0.88];p 65 years, (p-values Conclusion: The benefits of using the FreeStyle Libre<sup>TM</sup> flash glucose monitoring system are self-evident in reducing HbA1c and events due to hyperglycemia or hypoglycemia.
基金Sponsored by the National High Technology Research and Development Prgram of China(Grant No2001AA42250)
文摘This paper presented a fuzzy Petri net model to deal with the monitoring of robotic assembly. Based on the fuzzy Petri net model, an efficient composite reasoning mode was proposed to perform fuzzy reasoning automatiealy. It can determine whether there exists an antecedent-consequence relationship between two contact states. Furthermore, various types of sensor signals can be converted to the same form of real values between zero and one, and the contradiction among large number, high degree of truth and importance of input conditions can be resolved very well by introducing the weight factors and priorities for sensor signals. Finally, a peg- in-the-hole example was given to illustrate the reasonability and feasibility of the proposed model.
文摘针对桥梁健康监测系统庞大、维护困难这一问题,以某连续钢桁梁为研究对象,优化关键性指标,搭建大桥健康监测系统,监测内容包括结构特征监测及耐久性监测,建立信号采集与传输、阈值报警等模块,构建大桥精细化BIM+GIS(Building Information Modeling+Geographic Information System)模型。监测系统实现动态和静态数据综合采集与控制,包括结构应力、结构振动等动态信息及梁体挠度、支座位移、梁端转角、视频等静态信息,系统传感器反馈灵敏,数据采集准确稳定。分析监测数据发现桥梁各监测指标均小于阈值,且具有一定余量,满足桥梁设计要求,桥梁处于安全运行状态。
文摘区域(如园区或楼宇)综合能源系统(integrated energy system,IES)的多能流源荷协调运行与优化调控潜力评估分析对整体提升能源互联网的能源利用效率、促进可再生能源规模化发展具有重要意义。然而在实际工程中,普遍可获取的是用户IES与外部能源网络进行能量交换的端口处采集的粗粒度总量运行数据,据此往往难以对用户IES运行状态和特性进行准确分析,无法满足不断提高的IES运行调控需求。对此,以园区电/气/热IES为研究对象,提出基于耦合消元准则的IES非侵入式源荷设备状态联合感知方法,它仅利用在园区与外部电/气/热能源网络进行能量交换的端口处采集到的总量电/气/热运行数据及气象数据,辨识园区内部主要源荷设备的运行状态。总体上,基于IES内部各能源子系统间的耦合特性,按照气-电-热的顺序分别对每个子系统中主体设备的工作状态和(等效)运行功率进行非侵入式辨识。基于实测数据的实验结果表明,所提方法能够以“非侵入”的方式联合感知多能源荷设备的运行状态,精细化辨识园区IES内部主体设备的(等效)功率,具有较强的工程实用性,可为IES的仿真分析和运行决策提供细粒度大数据源。
文摘为提高燃气电厂直流系统蓄电池荷电状态监控的准确性,实现精准监控目标,开展了蓄电池荷电状态精准监控算法研究。安装传感器,采集蓄电池运行参数;利用算术平均滤波方法,滤除蓄电池噪声数据,输出到指定的存储介质;通过对蓄电池充放电过程中的电流进行积分运算,计算蓄电池使用电量的变化来估算荷电状态;建立蓄电池等效模型,将荷电状态(state of charge,SOC)估算结果与蓄电池充放电特性变化输入到监控中心,反映蓄电池的当前状态,设定SOC报警阈值,监控结果接近或达到报警阈值,则准备触发报警。实验结果表明:该算法应用后,在所有荷电状态下的SOC监控值均更接近实际值,监控精度较高。