Early faults prediction of running state of electromechanical systems and reconfigurable integration of series safety monitoring systems

Fault prediction technology of running state of electromechanical systems is one of the key technologies that ensure safe and reliable operation of electromechanical equipment in health state. For multiple types of modern, high-end and key electromechanical equipment, this paper will describe the early faults prediction method for multi-type electromechanical systems, which is favorable for predicting early faults of complex electromechanical systems in non-stationary, nonlinear, variable working conditions and long-time running state; the paper shall introduce the reconfigurable integration technology of series safety monitoring systems based on which the integrated development platform of series safety monitoring systems is built. This platform can adapt to integrated R&D of series safety monitoring systems characterized by high technology, multiple species and low volume. With the help of this platform, series safety monitoring systems were developed, and the Remote Network Security Monitoring Center for Facility Groups was built. Experimental research and engineering applications show that: this new fault prediction method has realized the development trend features extraction of typical electromechanical systems, multi-information fusion, intelligent information decision-making and so on, improving the processing accuracy, relevance and applicability of information; new reconfigurable integration technologies have improved the integration level and R&D efficiency of series safety monitoring systems as well as expanded the scope of application; the series safety monitoring systems developed based on reconfigurable integration platform has already played an important role in many aspects including ensuring safety operation of equipment, stabilizing product quality, optimizing running state, saving energy consumption, reducing environmental pollution, improving working conditions, carrying out scientific maintenance, advancing equipment utilization, saving maintenance charge and enhancing the level of information management.

Analysis on the Application of Electrical New Technology of in Electromechanical Integration

The electrical new technology is a new frontier science.This kind of technology, with the development and progress of society, makes the continuous development and innovation.It is the future development trend of electrical engineering system,which plays a very important role in technological innovation.The principle and theoretical support for the development of electrical new technology includes Bio- electro magnetics, plasma physics, electromagnetic fluid mechanics and gas discharge physics etc.In addition, under the application of permanent magnetic materials and other new materials, the electrical new technology and obtained further development also promote the development and application of electronic power supply, strong magnetic field technology, solar photovoltaic power generation, and superconducting power technology.This paper mainly analyzes the application of electrical new technology in electromechanical integration.

Dynamics of mechanical system for electromechanical integrated toroidal drive under electric disturbance

Based on electromagnetics and mechanics, electromechanical coupled dynamic equations for the drive were developed. Using method of perturbation, free vibrations of the mechanical system under electric disturbance were investigated. The forced responses of the mechanical system to mechanical excitation under electric disturbance were also presented. It is known that for the system with electric disturbance, as time grows, beat occurs. When electric disturbing frequency is near to the natural frequencies of the mechanical system or their integer multiple, resonance vibrations occur. The forced responses of the mechanical system to mechanical excitation under electric disturbance are compound vibrations decided by mechanical excitation, electric disturbance and parameters of the system. The coupled resonance vibration caused by electric disturbance and mechanical excitation was discussed as well. The conditions under which above coupled resonance occurs were presented. The results show that when the difference of the excitation frequency and the perturbation frequency is equal to some order of natural frequency, coupled resonance vibrations occur.

一种三维集成的Ku波段高功率T/R模块

基于硅基微电子机械系统(MEMS)三维(3D)异构集成工艺,设计并制作了用于相控阵天线系统的三维堆叠式Ku波段四通道高功率收发(T/R)模块。该模块由两层硅基封装堆叠而成,层间采用球栅阵列(BGA)植球堆叠,实现模块小型化;采用高低阻抗匹配建模,保证低损耗输出,采用导热垫加微流道散热板达到了良好的散热效果,实现模块高功率输出;对模块的微波垂直互连结构和散热进行建模和仿真。测试结果表明,在14~18 GHz内发射通道饱和输出功率大于40 dBm,接收通道增益大于21 dB,噪声系数小于3.5 dB,模块尺寸仅为14.0 mm×14.0 mm×3.3 mm。该模块在兼顾高集成度的同时性能指标得到了进一步提升。

集团化医院多院区后勤机电设备设施集成化管理探索与实践

分析了集团化医院多院区后勤机电系统管理信息化的现状,以及医院后勤管理流程存在的问题和挑战。以华中科技大学同济医学院附属协和医院为例,介绍医院后勤一体化综合管理平台对于后勤机电设备的集成管理实践,包括平台的功能框架、部署方式以及数据标准化和流程优化等。通过平台的部署和集成,实现了多院区后勤机电设备和系统的数据共享和协同管理。实践表明,基于综合管理平台的集成管理是解决集团化医院多院区后勤机电系统管理问题的有效途径。

X波段Si基片集成脊波导MEMS环行器

基于波导传输理论设计并制备了一款Si基片集成脊波导(RSIW)微电子机械系统(MEMS)环行器,该环形器以高阻硅作为衬底材料,采用高精度三维MEMS加工工艺制备而成。通过在基片集成波导(SIW)结构中添加脊梁结构,形成RSIW传输结构,使传输主模TE10模的截止频率比矩形波导TE10模的低,从而实现相同频率下更小的器件尺寸。同时,通过电磁仿真软件对射频匹配和磁场分布进行了精确的建模仿真,完成了Si基片集成脊波导MEMS环行器的仿真设计。制备了尺寸为6 mm×6 mm的环行器样品并进行了测试,结果验证了仿真设计的准确性,其工作频率为8~12 GHz,回波损耗大于20 dB,隔离度大于18 dB,插入损耗小于0.5 dB。实现优良微波特性的同时,相比于常规的SIW结构环行器尺寸缩小了20%左右。

智慧城轨车地一体化机电系统标准体系构建研究

With the rapid development and application of emerging information technologies such as cloud computing,big data,artificial intelligence,5G,satellite communication,and blockchain in urban rail transit,China’s urban rail transit has entered an era of intelligent transformation and upgrading.The development of intelligent systems and the construction of smart urban rail transit have formed a consensus in the industry.The electromechanical system is an important component of urban rail transit engineering,covering power supply stations,vehicles,stations,and lines.The depot and control center are important support for promoting the development of urban rail transit towards informatization and intelligence.However,research on the technical standards for the smart urban rail vehicle-ground integrated electromechanical system has just begun,and a technical standards system has not yet been formed,which cannot better support the electromechanical system.Therefore,it is necessary to conduct research on the technical standards system,propose the common criteria structure and standards list of the standards system,which can provide reference and guidance for the planning and establishment of China’s smart urban rail standards system.

船舶机电设备综合可靠性试验技术研究综述

首先,阐述了船舶机电设备综合应力特征及其耦合效应,包括温湿度-振动、温湿度-盐雾、振动-摇摆、工作载荷-综合环境等耦合,表明可靠性试验中综合应力耦合的必要性;其次,概述了国内外综合试验装置研制情况,包括三综合、四综合试验装置,振动-摇摆试验装置,工作载荷-综合环境试验装置,了解到现有综合应力试验设备已不能满足船舶机电设备真实环境模拟的要求;最后,梳理、对比了温湿-振动、温湿-盐雾、摇摆-振动和工作载荷-综合环境可靠性试验方法研究现状,并以船舶离心泵为对象,模拟离心泵实船服役环境,提出了一种适用于船舶机电设备的可靠性试验技术方案,为后续建立船舶机电设备综合可靠性试验标准提供了参考。

X波段MEMS硅腔折叠基片集成波导环行器芯片

通信系统向小型化、高性能、集成化的快速发展对射频组件的体积和电性能提出了苛刻的要求。设计了一种X波段硅腔折叠基片集成波导(FSIW)环行器芯片。当基片集成波导(SIW)工作于主模时,将中央的对称面等效为虚拟磁壁,沿着窄边对电磁场进行多次折叠,形成FSIW。以该技术作为设计思路,提高空间利用率,实现了FSIW整体结构的小型化。将FSIW的优势融入环行器中心结设计,使设计的环行器芯片具有高功率容量、低插入损耗、体积小、质量轻的优点。基于微电子机械系统(MEMS)工艺,以高阻硅为衬底材料,制备了该硅腔FSIW环行器芯片,芯片整体尺寸为6.5 mm×6 mm×2.5 mm,工作频率为8.5~11.5 GHz,回波损耗>18.5 dB,带内插入损耗<0.4 dB,隔离度>20 dB。

250 kHz收发一体化水声换能器

针对水声领域对兼有高效发射和高灵敏度接收、收发工作频带重合、结构一体化高频水声换能器的应用需求,该文研制了一种高灵敏度收发一体水声换能器。该换能器由发射单元和接收单元两部分嵌套组成,发射单元采用1-3复合材料,接收单元采用单金属板压电陶瓷阵列结构。首先,通过有限元模拟确定发射和接收单元频率使其满足收发一体条件;其次接收单元采取改变压电陶瓷结构提升了机电耦合系数,从而提升接收灵敏度;最后制备了换能器样机并进行测试。结果表明,发射单元共振频率和接收单元反共振频均在250 kHz附近,接收灵敏度最高可达-173:5 dB,满足收发一体条件和高灵敏性能。

用于三轴MEMS加速度计的集成数字调理电路

基于0.18μm互补金属氧化物半导体(CMOS)工艺,设计了一种用于三轴微电子机械系统(MEMS)加速度计的集成数字调理电路,实现了三轴加速度信号的数字后处理。该数字调理电路采用级联积分梳状(CIC)与有限冲击响应(FIR)相结合的滤波器形式,有效滤除了带外的量化噪声,提高了输出信号的信噪比;零位采用四阶多项式拟合温补算法,标度因数采用二阶多项式拟合温补算法,有效降低了加速度输出随温度的漂移,提升了加速度计的测量精度。此外,FIR滤波器采用时分复用的实现形式,温补模块采用串行实现形式,有效减小了芯片面积,最终芯片面积为1.5 mm^(2)。测试结果表明,滤波器符合设计值,三轴MEMS加速度计的零偏不稳定性为15μg,速率随机游走为0.035 m/s/√h,温补后零偏全温区变化量为3.55mg,提升了5.4倍;温补后标度因数全温区变化量为0.0026,提升了4.1倍,电路性能良好。

Indentation behavior of a semi-infinite piezoelectric semiconductor under a rigid flat-ended cylindrical indenter

This paper theoretically studies the axisymmetric frictionless indentation of a transversely isotropic piezoelectric semiconductor(PSC)half-space subject to a rigid flatended cylindrical indenter.The contact area and other surface of the PSC half-space are assumed to be electrically insulating.By the Hankel integral transformation,the problem is reduced to the Fredholm integral equation of the second kind.This equation is solved numerically to obtain the indentation behaviors of the PSC half-space,mainly including the indentation force-depth relation and the electric potential-depth relation.The results show that the effect of the semiconductor property on the indentation responses is limited within a certain range of variation of the steady carrier concentration.The dependence of indentation behavior on material properties is also analyzed by two different kinds of PSCs.Finite element simulations are conducted to verify the results calculated by the integral equation technique,and good agreement is demonstrated.

采用基片集成波导技术的毫米波MEMS环行器

设计并制备了一款毫米波的微机电系统(MEMS)环行器。该毫米波MEMS环行器芯片采用高阻硅作为衬底,利用基片集成波导(SIW)技术,基于硅基MEMS工艺,采用低损耗金属化技术,实现了硅通孔金属化的制备。采用三维电磁仿真软件进行模拟,设计了该毫米波MEMS环行器的结构以及SIW与微带线的过渡匹配,并在此基础上优化设计了一套通用的制备毫米波MEMS环行器的工艺流程。并对制备的毫米波MEMS环行器进行了性能测试。结果表明,该环行器的频率范围为24~28 GHz,频带内插入损耗≤0.5 dB,隔离度≥17 dB,尺寸仅为5 mm×5 mm×2.5 mm,能够满足大部分应用需求。

模块化集成医疗实验室关键技术

目前医院既有传统实验室固有空间模式已无法满足现代技术的多场景、多功能切换要求,针对传统既有实验室空间的单一性和功能管道的复杂性,通过研发模块化集成隔墙和集成吊顶来汇集水、电、气路及通风等管线,以实现场景化整合、空间快速切换,解决实验室固有空间缺陷、多专业管线凌乱等难题,进而有效应对未来实验室研究的发展需求。

机电液综合实训平台与虚拟仿真技术的应用

液压与气压传动技术凭借独特的优势广泛应用在机械行业,极大地促进了装备制造业的发展。基于此,机电液综合实训平台与虚拟仿真采用新技术、新方法,将机械传动、控制技术、液(气)压传动有机结合,从虚拟到实践一体化促进知识的学习与技能发展,为装备制造业输送高技能人才。

在VLSI制造中基于辅助图形的灰度光刻形成三维结构

半导体器件从单一的二维尺度微缩转向更复杂的三维物理结构,而其传统的制造方法与以硅基逻辑或存储器为主的超大规模集成电路(VLSI)制造工艺的兼容性越来越差。灰度光刻是一种实现三维结构的可行技术方案,但因物理尺寸受限和大规模制造成本过高,无法被直接应用于超大规模集成电路制造。提出了一种基于辅助图形的灰度光刻技术,通过辅助图形而非传统灰度光刻调整光源或透过介质的方法来调整光强分布,并结合光刻胶筛选方法,实现了仅通过调整单一光刻工艺模块,就使现有超大规模集成电路制造工艺生产线可低成本地兼容三维结构器件制造。制作了三维结构的微电子机械系统(MEMS)运动传感器,从而验证了所提出工艺的可行性。

产教融合背景下机电技术应用专业的发展与探究

发展我国的职业教育需深入实施“产教结合,学校与企业的协同合作”,党的十九大报告已将这一方针上升到国家策略高度,此种合作模式不仅能培育学生的实际技能,还能满足企业对人才的需求,从而双方都能获益。本文基于对机电专业的现况研究,给出了教学更新的核心点和方案。

天津地铁机电设备运维工作中提质降本增效措施的探讨

天津地铁于2021年完成了机电设备维护与车站运营两业务板块架构优化的整合工作,调整后为运营中心管理模式下的机电设备维护工作带来较大的机遇与提升空间。为了充分发挥架构整合工作的优势,文章重点针对机电设备运维管理工作中如何实现提质降本增效进行研究讨论,深入分析了设备维护成本控制的不利点,分别从两业务板块一体化业务的融合、机电设备维保模式的优化、节能降耗的管理三方面进行优化研究,初步形成了一体化业务融合管理模式,整合了设备巡检作业和精简委外维护项目,针对北方城市运营环境特点制定环控空调、车站照明、生活用水、设备运行等技术节能方案,打破了传统设备维护模式,形成一整套车站运营设备维护管理体系,为后续以市场化、专业化角度输出运营管理经验奠定基础。

高职机电专业高水平结构化教师教学团队探索与实践

通过对高职机电专业群教师教学创新团队建设内涵和问题进行探讨,提出专业群教师教学团队建设新路径。在教师教学团队建设中,按照“1+3”模式,建立“固定岗+流动岗”机制、校企协同创新项目机制,组建以“名师”为引领的工匠型技能团队、专业型创新团队、结构化教学团队。为机电专业打造了技能领先、科技创新、产教融合的高水平结构化教师教学团队,为高职专业建设高水平结构化教师教学团队提供思路和依据。

基于智能制造的机电一体化设备轧花新工艺研究

机电一体化设备集成了机械和电子技术,应用该设备有助于提高生产效率和设备性能。因此,回顾机电一体化设备在传统轧花工艺中的应用现状和存在的技术问题,系统阐述基于智能制造的新轧花工艺的设计理念与目标,详细介绍新工艺中关键模块的设计,包括控制系统、传感器和数据处理模块,并探讨工艺参数的优化方法和系统集成策略,旨在提高轧花工艺的整体性能和自动化水平。