分析了常见的50Ω/50μH+5Ω和50Ω/5μH+1Ω两种不同V型人工电源网络的差异,对直流电能表分别使用这两种电源网络进行端子传导骚扰的测量,在典型频率点的测量结果进行了分析比较.对直流电能表的端子传导骚扰测量来讲,50Ω/50μH+5Ω网络可用作摸底性测试,而标准符合性测量结果必须以50Ω/5μH+1Ω网络为准.

利用X射线衍射仪、差示扫描量热仪、电化学工作站、显微硬度计对火试金法中金银合粒的组织结构、耐腐蚀性、力学性能进行了研究.结果表明:银、金质量比分别为2.1,2.3和2.5时金银合粒的分子式为Ag79 Au21、Ag81 Au19和Ag82 Au18,均为银基固溶体,其熔化开始温度和凝固结束温度相近,耐腐蚀性和力学性能相似.采用火试金法测定金合金首饰中金量时,银、金质量比为2.1～2.5对测定结果没有影响.

平视显示器作为安全辅助驾驶设备,对减少因低头走神引起的交通事故有着重要的价值.针对平视显示器技术的中国专利,从专利申请年份、主要申请人和技术主题3个方面分析了当前的技术状况,并对我国平视显示器技术发展提出了一些建议.

在设计一款车身中央控制器的过程中,需要设计很多定时应用,为此设计了一种高效定时器模块,该模块在单个硬件定时器的基础上模拟实现了多个软件定时器,节省了硬件及软件资源,简化了程序编写;描述了软件定时器的设计原理、结构设计、驱动程序设计及其应用。

This paper introduces the basic architecture of the driving motor and control system of an electric vehicle.The paper also presents the status quo from such three profiles as motor,power electronics and control technology and predicts the prospects of an electric vehicle.

汽车电子产品在功能完善的同时对性能稳定性有很高的要求,对蓝牙技术在汽车电子产品中的应用而言,性能稳定性的最大挑战在于能否兼容大部分手机.笔者结合自己为某汽车厂商开发的一款蓝牙车裁设备的经验,重点分析了产品开发过程中遇到的兼容性问题,并给出了能实现最大兼容性的解决方案.

Based on the corrosion investigation in reinjection pipelines from 7 sewage plants in Shengli Oilfield,the paper adopts grey correlation method to analyze correlative degree of all the factors affecting on sewage corrosivity,and then obtains a correlative degree sequence.It shows that main effective factors on sewage corrosivity in reinjection pipelines of sewage plants in Shengli Oilfield are total salinity,SRB and dissolved oxygen contents.A grey dynamic model reflecting the change of corrosion rate with time is developed by GM(1.1)system mode and it is used to predict corrosion rates.Prediction results have good agreement with measurement data.

With the development of optical fiber sensing technology,the Fiber Bragg Grating sensor with characteristics of intrinsically safety,anti - interference,small size,high precision is widely used in the field of mine safety monitoring. This article describes the principle and system structure of the technology of Fiber Bragg Grating sensing.For example, in the Geting mine safety monitoring,through comprehensive analysis,the temperature accuracy is±1℃.And using Configuration Software,it can provide an advanced solution to get mine safety monitoring.

Distributed fiber optic temperature sensing(DTS) system is important in the surveillance of cable temperature.This paper presents the principles of the Raman back-scattering effect based temperature sensing and the OTDR(Optical Time-Domain Reflectometry) based positioning.We take the temperature surveillance system of a 4 km electrical cable of Qingdao as an instance,in which we present the selection of optical cable and system functionalities.Its temperature precision is ±1℃ and location accuracy is ±2 m so it provides the scientific basis for the surveillance of cable temperature and the safety of electric distribution.

The technical characteristic of B/S and C/S structure were analyzed.In order to improve the data transmission efficiency and the stability of the traditional remote monitoring system,the embedded remote monitoring system based on B/S and C/S structure was proposed.The architecture of the system was designed.The embedded remote monitoring system based on the B/S and C/S is stable and simple,and speeds up the network transmission rate and improve the reliability of system.The system has broad application foreground in the field of industrial control.

Considering the power distribution unbalance characteristic of parallel running diesel generator sets,the power balance fuzzy controller is designed.It uses PLC and IPC as the center of control system,and applies MIMO fuzzy control algorithm.This algorithm packaged in the dynamic link library is called by WinCC,and then its output is transferred with PROFIBUS communication mode to PLC to drive the actuators.Finally the active and reactive power online balance assigning of diesel generator sets are realized.

The distributed optical fiber temperature measurement approach is superior to other approaches in the thermal extraction of thick oil,which is based on the principles of optical fiber Raman back-scattering and OTDR(Optical Time-Domain Reflectometry) positioning.The experiment of temperature calibration that is performed in an indoor scenario whose temperature is similar to that in a well and by the approach of second fitting to improve temperature accuracy in the range of high temperature,achieves satisfactory results.Its temperature range is from 0 to 350 ℃,the range of optical fiber length from 0 to 1900 m,the temperature accuracy ±2 ℃,and the distance location accuracy ± 2 m,which provides the authentic data for the measurement of the temperature in an oil well.