本安型锚杆锚固质量导波无损检测仪的开发

设计开发了一种基于导波的便携式本安型锚杆锚固质量无损检测仪.介绍了该检测仪设计开发的过程,包括检测仪的硬件设计、软件设计和上位机软件的设计开发.制作锚杆模型进行实验,使用检测仪对锚杆进行检测,检测仪能够准确地检测出锚杆的有效锚固长度和锚固力,判断出锚杆的锚固质量.通过重复性试验证明,检测仪性能稳定可靠.检测仪满足本质安全型防爆要求,能够在煤矿井下安全使用,在煤矿井下的锚杆锚固质量检测上具有一定的应用潜力.     

一种教学机器人上位机软件设计与实现

教学机器人是机电类学生专业教育的一个重要工具,其上位机软件直接决定教学机器人的控制效果,提出上位机控制系统的总体结构。分析典型上位机软件模块,对上位机软件进行试验研究,结果显示该上位机软件能够满足性能要求。     

汽车氧传感器检测设备配气方案设计

该文通过发动机台架实验不同工况下发动机尾气成分,利用傅里叶变换红外光谱法精确测量尾气的成分含量,通过测试结果分析得出尾气各成分比例,结合试验结果和实际检测设备开发确定汽车氧传感器检测设备配气方案,实现逼真模拟汽车氧传感器测试环境,并通过实验验证该方案的可行性。该方案的设计可为汽车氧传感器产品检测提供一种新尝试,为其他尾气处理及监测类产品测试提供参考。     

基于STM32L151的低功耗便携式多组分气体检测仪设计

本文设计了一种基于STM32L151的便携式多组份气体检测仪,采用电化学原理测量硫化氢、一氧化碳和氧气的浓度,利用催化燃烧原理测量甲烷的浓度.本文详细介绍了气体浓度检测原理及其调理电路、系统控制电路和上、下位机软件设计.实验证明,该气体检测仪具有体积小,功耗低,测量精度高等优点,适用于日常生活和工业生产等各类场景.     

PLC输入输出接口测试系统设计

详细介绍了一种基于STC12C5410AD单片机和上位机软件的PLC自检测和外围设备测试系统的硬件电路实现办法.以及单片机软件和上位机软件的实现方法,模拟设计出了PLC现场调试过程中所需要的模拟/数字输入,并且该测试系统的端口可以接受来自PLC的模拟/数字输出.该系统可以模拟工业现场环境,对PLC系统进行调试.另外也可对PLC的教学和培训提供较大便利.     

混合钟罩式气体流量标准装置测控系统

在简述20000L混合钟罩式气体流量标准装置工作原理的基础上,重点介绍了该套装置中测量和控制系统的功能与实现方法,下位机硬件设计和上位机软件开发的整体思路,并简述了如何在单一装置中同时实现固定容积法、可变容积法和标准表法三种工作模式,极大地增强了钟罩式气体流量标准装置工作的灵活性和机动性。装置上位机采用VB.NET,下位机采用测量控制柜集成模块,详细描述了测量控制柜模块组态和控制流程以及上位机实现流程和功能。     

温度检测系统的上位机软件设计

在一个完备的工业系统中,不仅需要有检测和控制系统,还需要有能够更为直观的监测系统。主要通过编写上位机软件来实现系统的温度监测。利用面向对象的程序设计语言VB实现人机交互,通过PC机的串口读取下位机采集的信号量,进行实时监控显示。     

便携式PPM性能测试装置的设计

该测试装置是一种用于柱塞泵与柱塞马达(Piston Pump & Motor)液压试验台的便携式性能测试装置.把该装置与HEDLAND公司生产的Flo-tech系列的涡轮流量传感器连接,可以对温度、流量、压力进行测量,并通过上位机软件的数据处理,可以得出被测PPM的性能报告.该装置基于C8051F206单片机,采用CP2102实现了USB的功能,该装置具有精度高、噪声低、抗干扰能力强等特点,经实际使用证明本装置具有很强的市场推广价值.     

便携式PPM性能测试装置的设计

该测试装置是一种用于柱塞泵与柱塞马达（Piston Pump ＆ Motor）液压试验台的便携式性能测试装置。把该装置与HEDLAND公司生产的Flo—teeh系列的涡轮流量传感器连接,可以对温度、流量、压力进行测量,并通过上位机软件的数据处理,可以得出被测PPM的性能报告。该装置基于C8051F206单片机,采用CP2102实现了USB的功能,该装置具有精度高、噪声低、抗干扰能力强等特点,经实际使用证明本装置具有很强的市场推广价值。     

声学坐底式波浪仪的上位机设计

声学坐底式波浪仪包括水下测量系统和陆上处理主机,研究了陆上主机的上位机软件设计方法,并重点研究波浪估计算法在上位机软件的实现方法。波浪估计算法计算复杂,在上位机软件开发环境delphi 7下实现困难,文章采用delphi7和matlab 7.0混合编程方法实现上位机中的波浪估计功能,该混合编程方法实现更为简单,开发周期短。通过实测数据的验证,上位机软件与RD公司商用软件WAVESMON的波浪估计结果是一致的,证明了上位机软件的波浪估计结果是准确的,所设计上位机软件可有效满足波浪仪陆上处理系统的波浪处理需求。     

A portable electronic nose based on embedded PC technology and GNU/Linux: hardware, software and applications

This paper describes a portable electronic nose based on embedded PC technology. The instrument combines a small footprint with the versatility offered by embedded technology in terms of software development and digital communications services. A summary of the proposed hardware and software solutions is provided with an emphasis on data processing. Data evaluation procedures available in the instrument include automatic feature selection by means of SFFS, feature extraction with linear discriminant analysis (LDA) and principal component analysis (PCA), multi-component analysis with partial least squares (PLS) and classification through k-NN and Gaussian mixture models. In terms of instrumentation, the instrument makes use of temperature modulation to improve the selectivity of commercial metal oxide gas sensors. Field applications of the instrument, including experimental results, are also presented.     

Fluorometric field instrument for continuous measurement of atmospheric hydrogen sulfide.

A sensitive (limit of detection approximately <100 pptv at S/N = 3), fully automated, portable (32 x 25 x 38 cm, 4.5 kg) instrument has been designed for continuous field measurement of atmospheric hydrogen sulfide. Air is sampled by a PTFE membrane-based diffusion scrubber and collected into an aLkaline fluorescein mercuric acetate (FMA) solution flowing under a controlled and constant pneumatic pressure. The collected sulfide quenches the fluorescence that is measured with a miniature blue LED photodiode-based fluorescence detector. Acquisition and interpretation of signal and all flow control are carried out via a mininotebook personal computer (PC) using custom software written in HP-VEE. The instrument provides for self-calibration and zero functions using an on-board permeation tube enclosed in a thermostated block, at any preprogrammed desired interval. During sampling, the computed H2S concentration is stored every 2 min. The complete system, including the PC, is operated in the field by a 12-V marine battery. The system was field tested near oil field operations in West Texas and showed good correlations with a concurrently operated lead acetate tape-based commercial sampler, with a response speed and time resolution much better than that of the latter instrument.     

Design methodology for a Fabry-Perot interferometer used as a concentration sensor

We present the design methodology for a sensor that can nonintrusively monitor target gas concentration levels in a power plant exhaust flow. The measurement is based on radiative emission by rovibrational transitions that are well isolated from emission features of other constituents and requires both moderate spectral resolution (typically 1 nm or below) and relatively high optical throughput. A Fabry-Perot interferometer provides this capability, and its conceptual design is discussed at length. High-temperature radiative emission of nitric oxide in a background of water was used as a sample system for the design of a prototype Fabry-Perot interferometer. Predictions for the instrument are a minimum resolvable NO column density of 100 parts per million times meter based on a simple background subtraction scheme with a gas temperature of 800 K. Improved order sorting can dramatically lower this minimum. The prototype instrument was calibrated and tested with a laboratory simulator; results are presented and compared with predictions.     

DOC+DPF在防爆柴油机上的应用研究

在某型防爆柴油机加装DOC+DPF后处理装置上进行台架实验,结果表明,PY03型装置不会增大防爆柴油机系统的排气背压,对CO平均转化效率达96%,对颗粒物有较高的捕集和再生效率,不透光烟度平均转化效率为82.7%;PY02型装置因尺寸较小,热负荷较高,与该排放状况不匹配。为提高装置的利用率和使用寿命,通过对耦合的DOC+DPF孔道进行可燃性气体CO组分输运和颗粒物离散相数值模拟。结果表明:随着废气流速的增大,DOC+DPF出口废气中CO浓度升高,转化效率下降;15 m/s的气流速度是发动机该排放水平下转化效率最高的最大速度;孔道入口速度增大,颗粒物向孔道后端壁面沉积;DOC+DPF装置在防爆柴油机上实用可行。     

紧凑式SCR净化消声装置设计与性能分析

紧凑式SCR净化消声装置能够实现柴油机尾气净化和排气噪声控制双重功能，使用Fluent软件DPM模型对SCR净化消声装置内的气体流动、水溶液喷射雾化过程进行数值模拟，使用Sysnoise软件中的有限元法计算SCR净化消声装置的声学性能，研究不同进口方式和穿孔管对阻力损失和传递损失的影响。     

Heat and mass transfer during in-flight nitridation of molybdenum disilicide powder in an induction plasma reactor

The present study reveals some of the important parameters which control the in-flight nitridation of molybdenum disilicide (MoSi₂) powders when carried out in an induction thermal plasma reactor. Initially, gradients of temperature, velocity and concentration were evaluated, using an enthalpy probe system, for the plasma flow without injection of MoSi₂ powders. Radial profiles were then measured at the torch exit to examine the mass and energy transfer mechanisms occurring under different nitridation conditions. These measurements were performed using an induction plasma torch connected to a 50 kW radio-frequency (r.f.) power supply, the torch being attached to a water cooled cylindrical reactor. The process operating conditions studied were plasma plate power, chamber pressure, sheath gas composition, composition and flow rate of quench gas. The effect of last named parameter on the nitridation of the powders was found to be the most important parameter in the nitridation process. The results show that there is an optimum flow rate value for each type of quench gas and the temperature and concentration mapping demonstrates that the combination of high temperatures and high concentrations of N₂ are necessary to reach maximum nitridation levels in MoSi₂.     

Development of an inverse method to identify the kinetics of heavy metal release during waste incineration in fluidized bed

This paper deals with the emission of heavy metals (HM) during the incineration of municipal solid waste in a fluidized bed reactor. This study focused on the development of a general method to identify the kinetics of vaporization of heavy metals from the on-line analysis of exhaust gas. This method is an inverse method, which requires only the time evolution of the HM concentration in exhaust gases (experimental data) and a global bubbling bed model developed for transient conditions at the reactor scale. First, a lab-scale fluidized bed incinerator was set-up to simulate the HM release during the thermal treatment of metal-spiked model wastes. A specific on-line analysis system based on ICP-OES was developed to measure in real time the variation of the relative concentration of HM in exhaust gases. Then, a two-phase flow bubbling bed model was developed and validated to calculate the kinetics of vaporization of HM from its measured concentration time profile in the outlet gas. The technique was first validated with model waste (metal-spiked mineral matrices), thus enabling at each time both solid sampling for measuring the HM vaporization kinetic and on-line analysis for measuring the HM concentration in the outlet gas. The inverse method was then applied to realistic artificial wastes (derived from real wastes) to identify the HM vaporization kinetics from the on-line analysis results.     

柴油机振动监测及故障诊断系统

简述了柴油机活塞-缸套磨损、气阀间隙异常、排气门漏气和主轴承磨损故障的振动诊断机理,介绍了基于上述机理的自行研制的柴油机振动监测仪的硬件设计和软件功能,该仪器利用PC104总线、高速同步采集、异步FIFO和DOS编程环境等技术,经测试能实现船舶柴油机的实时在线诊断。     

Detection properties of a measuring system for a continuous soil radon concentrations monitoring.

The continual soil-gas radon concentration measurements are absolutely crucial for a reliable assessment of radon entry characteristics into the indoor building environment. For this purpose, a new detection system (a continuous monitor RM-3) was developed and tested. The detection principle of the monitoring device is based on an airflow ionisation chamber operating in a current mode. A comprehensive series of testing and calibration experiments have been carried out in a laboratory environment. An output signal of the device caused by the radon concentration in a sensitive detection volume significantly depends on a detector ventilation rate, the gas flow rate through the ionisation chamber. A set of calibration experiments was accomplished with the artificial radon source application and close circuit experimental arrangements. The system detection properties including applied experimental conditions and key results of pilot in situ measurements are reported in detail.     

The Study of Performance in a Novel Gas–Solid Separator

The three slit-type separator is a new separator which can shorten the residence time of oil & gas and improve the separation efficiency. In this study, a critical validation was carried out to examine the separation performances of the three slit-type separator with different inlet velocity and inlet concentration. According to the experimental results, the separation efficiency and pressure drop of the three slit-type separator increase with the increase of inlet velocity and inlet concentration. Numerical simulation of the gas–solid flow field in the three slit-type separator was carried out by the use of Fluent 15.0 platform. The simulated results coincide with the experimental results. The particles move along the inside wall of the separator in the vaulted space, meanwhile, more gas enters into the exhaust pipe through slots, which can improve the separation efficiency. The study shows that the residence time of oil and gas is less than 0.6 and the separation efficiency is up to 99% in the separator, in addition, the pressure drop could be controlled in 4 kPa below.