钢丝绳无损检测在流动式起重机上的应用

介绍了MTC钢丝绳安全检测仪的检测原理及现场应用,将该仪器用于流动式起重机在役钢丝绳的无损检测,确保了钢丝绳运行的安全和可靠.     

In-situ nondestructive assessment and performance comparison of haulage ropes in bi-cable zig-back passenger ropeway

Nondestructive assessment of haulage ropes is essential for aerial ropeways. An attempt has been made in this paper to compare the performance of drive and counter haulage ropes in a zig-back bi-cable aerial ropeway. The study has been carried out over two life span of ropes in the installation.     

无损检测在役钢丝绳标准的研究

通过对我国现行的钢丝绳标准体系和美国电磁无损检测铁磁性钢丝绳标准的主要内容的介绍,提出随着我国钢丝绳无损检测技术的发展,应该进行这方面标准化工作的必要性。     

In situ assessment of independent wire rope core ropes in cage winders by a nondestructive method

The most widely used method to study the condition of winder ropes is the magnetic nondestructive method. Localized and distributed flaws in winder ropes can be detected by this method. This paper is intended to highlight the findings using such a technique in the case of independent wire rope core rope in two cage winders in a coal mine. The text was submitted by the authors in English.     

6自由度绳牵引并联机构的位置空间分析

文中对绳牵引并联机器人的位置空间进行了研究.在绳牵引并联机构的应用中,工作空间的形状是需要了解的重要因素.通过绳牵引并联机器人的力和力矩平衡方程得出了判断一个位形是否在工作空间中的方法.据此进行仿真分析,确定了6-6型绳牵引并联机器人的位置工作空间形状同运动平台和基座几何布置、尺寸的关系.     

X9313在播种机排种检测装置中的应用

本文论述了应用X9313自动调节CCD光电耦合装置的电源电压，从而使播种机排种检测装置能够在恶劣的田间作业中连续、可靠工作的设计思想。     

Testing of discs of turbine rotors of gas compressors with the dye penetrant nondestructive testing technique

The special features of diagnostics of turbine discs of ΓTK-10-4 gas compressor units tested by the dye penetrant flaw detection method are considered. It is shown that disc blades must be dismantled and carefully mechanically cleaned, the spots in discs where such flaws as cracks are generated most often being analyzed, thereby reducing the searching and detection time.     

Development of the technique of nondestructive testing of heterogeneous dielectric materials based on utilization of the mechanoelectric transformation phenomenon

Defects of different types and sizes in a material are shown to result in variations in the spectral characteristics of electric responses to pulsed mechanical excitation of heterogeneous materials. General regularities reside in an increase in the size and concentration of defects that yields a decrease in the magnitude and quality factor of the principal spectral maximum and variations in the spectral composition of the electric response.     

Substitution of the time-of-flight diffraction technique for nondestructive testing of welds and thick layers of steel: A comparative investigation

Prevention of industrial disasters is a major concern. Nondestructive testing as a reliable tool has played an effective role in this regard. Ultrasonic testing of heavy press-sure vessels is a common practice. Particularly, a more customary procedure known as pulse-echo has become a standard in and of itself. In light of the increasing demand for more thorough inspection of pressure vessels, researchers have begun looking into more innovative means of defect measurement. Fundamentally, the time-of-flight diffraction (TOFD) flaw-detection procedure is based on the time measured for diffracted waves to travel from the two ends of a defect, and it is shown to be an effective procedure for size and location determination of a defect [1]. Specifically, it is demonstrated that this technique is more suitable for thick structures (above 10 mm). Today, the TOFD procedure is used for operational inspections or quality control of structures during production instead of routine radiography and ultrasonic NDT procedures [1]. Although TOFD is more often utilized for inspecting welds with simple geometry and small grain steels, such as face welds with thicknesses from 6 mm to 300 mm, it is useful in inspecting more complex geometries. Such defects as cracks, lack of penetration, lack of fusion, porosity, and slag in welds and pressure vessels could be diagnosed via this technique. In this investigation, on the basis of the review of related literature, the principal theory governing TOFD is discussed. A mathematical model is developed and different aspects have been compared. Advantages and disadvantages of its utilization are enumerated and specific applications are outlined. Recommendations and suggestions are made for future investigations and betterment of the procedure. The text was submitted by the authors in English.     

State of the art of in-line nondestructive weld inspection of pipelines by ultrasonics

The in-line inspection of pipelines via the use of intelligent PIGs (pipeline inspection gages) that concerns the detection and sizing of metal loss (e.g., caused by corrosion) is a well-established technology for liquid pipelines as well as gas pipelines. Magnetic flux leakage and ultrasonic techniques are used for inspection. The application of conventional ultrasonic techniques is normally restricted to liquid lines because a liquid coupling medium is required. For reliable crack detection, only the ultrasonic technique has proven suitable. The cracking in pipelines is induced by fatigue crack growth and stress corrosion cracking in addition to manufacturing-related phenomena. The state of the art of in-line crack inspection is discussed, especially as regards typical examples of weld inspection. Special emphasis is placed on data evaluation and interpretation. The text was submitted by the authors in English.     

Theoretical consideration of nondestructive testing by use of vertical magnetization and magneto-optical sensor

This paper describes a new magnetization method for non-destructive testing with magneto-optical sensor (denoted as MO sensor) which have the following characteristic; high observation sensitivity, independence of the crack orientation, and precise imaging of a complex crack geometry such as multiple cracks. When a magnetic field is applied normally to the surface of a specimen which is significantly larger than its defects, approximately the same magnetic charge per unit area occurs on the surface of the specimen. If there is a crack in the specimen, magnetic charge per unit area has the same value at the bottom of the crack. The distribution of the vertical component of the magnetic flux density, B_z, is almost uniform over the no-crack area (denoted as B_{Z, BASE}), while the magnetic flux density is smaller in the surroundings of the crack (denoted as B_{Z, CRACK}) : If B_{Z, BASE} is a bit larger than the saturated magnetic flux density of the MO sensor (B_S), then small magnetic domains occur over the crack area and a large domain over the non-crack area because B_{Z, CRACK} is smaller than B_s.     

Processing of active thermal nondestructive testing results by the method of wavelet analysis

Wavelet transforms can be used for active thermal nondestructive testing for the identification of flaws that are located at different depths and produce Gaussian-like signals characterized by a time shift on a heated surface. The results of the application of scalar and complex wavelet analysis for increasing the signal/noise ratio in the active thermal inspection of flaws in composite materials and thermal-barrier coatings, as well as also for revealing the corrosion in metals, are described. Parent Morlét, Paul, and Mexican-hat wavelets were used.     

全地面起重机超起拉索对主臂受力影响研究

在深入研究了全地面起重机超起装置工作原理的基础上,将悬链线理论应用到了超起装置的设计中,建立了超起拉索的线形方程.基于此方程,在ANSYS中用抗弯刚度极弱的梁单元模拟了超起拉索,并建立带超起装置的臂架系统有限元模型,对整个超起臂架系统进行了几何非线性有限元计算.以吊臂整体应力和销孔局部应力为考查点,通过算例定量分析了超起拉索线形对主臂和超起拉索受力影响规律.     

基于脉冲位相的红外热波无损检测法测量缺陷深度

提出了基于脉冲位相分析的数据处理方法以实现红外热波无损检测法对缺陷深度的测量.对脉冲红外热波无损检测的时间信号进行傅里叶变换(FFT),提取位相频率信息,根据热波频率与传导深度的关系完成缺陷深度的检测.以热传导较快的铝材料为例,对自行设计的深度不同的平底洞缺陷进行实验,并通过应用Matlab的FFT分析得到不同深度平底洞缺陷在不同频率下的位相曲线,同时,应用VC++得到位相序列热图.实验结果表明了脉冲位相对缺陷深度检测的可行性,缺陷实际深度与实验深度存在d≈1.98 μ的关系,同时位相图有效抑制了噪声的干扰,为材料和结构内部缺陷检测提供了一种有效处理方法.     

高压法微小电容检测

微小电容测量电路广泛应用于各种工业过程中,尤其是在用于电容层析成像系统中.大多数的微小电容测量电路采用了基于交流电流测量或直流充放电方法.这些方法的共同优点是具有较高的灵敏度和抗杂散电容能力.而且其交流激励电压或直流充放电电压一般在20 V以下.为进一步提高微小电容测量的灵敏度和分辨力,本文提出了一种高压交流激励方式电路,该电路将交流激励电压提高到几百至上千伏.实验表明该方法大大提高了微小电容测量的灵敏度和分辨力,同时具有良好的稳定性和线性度.     

Determination of protein with Thioguanine (6-TG) as a probe by synchronous fluorescence technique

The synchronous fluorescence technique was developed for the determination of human serum albumin (HSA) in human body fluids with Thioguanine (6-TG) as a molecular probe. Under the optimal experimental conditions, the synchronous fluorescence peak of HSA–6-TG system is located at about 301 nm and the enhancement synchronous intensity was proportion to the concentration of HSA. The calibration graphs are linear over the range of 0.69–552.0 μg mL⁻¹ with a correlation coefficient (R) of 0.9994. The detection limit was 0.133 μg mL⁻¹. It was successfully applied to determine the protein in human body fluids including serum, urine and saliva samples with 6-TG as probe with a satisfying result. In the analysis of human body liquids samples, the relative standard deviations (RSDs) were 0.55–3.31%, which obtained from 6 replicate determinations and recoveries were in the range of 97.0–104.1%.     

Inspection of locomotive bearing rings by the acoustic-emission method

The results of testing the bearing rings (BRs) of a locomotive axle box by the acoustic-emission (AE) method are presented. The small size of the localization zone of BRs leads to a significant spread of the coordinates of flaws even at minimal errors of the time of arrival of AE signals at piezoelectric-antenna probes. To refine the testing technique, the maximum testing load necessary for initializing AE signals is determined. Deformations in BRs are measured with a strain-gauging system related to the AE system. During recording of AE signals, the mechanical stresses are measured, thus allowing rejection of parasitic signals and an increase in the localization accuracy.     

TMS320C6X与PC高速通信的实现

ＴＬ１６Ｃ７５０是ＴＩ公司生产的通用异步通信芯片，可应用在高速串行通信中。本文介绍了ＴＬ１６Ｃ７５０的性能及有关寄存器，给出了其在ＴＭＳ３２０Ｃ６Ｘ与 ＰＣ通信应用中的硬件电路及ＴＭＳ３２０Ｃ６Ｘ初始化ＴＬ１６Ｃ７５０的汇编程序。     

利用LabVIEW实现多参数污水实时在线监测

介绍了利用虚拟仪器LabVIEW开发的多参数污水在线监测系统的功能及特点,讨论了系统软件设计的特色要点.     

6RA70系列直流调速装置的应用技巧

从机床控制直流调速技术中需要注意的几个问题入手，有针对性地阐述了直流调速装置的设计、调试和优化过程。