油气分离器失效分析

通过对油气分离器失效部位进行宏观检查、化学成分分析、金相分析、力学性能测试、断口形貌观察及能谱分析,认为工艺介质中硫化氢浓度的上升和材料纯净度不高是导致设备失效的根本原因,并提出了相应的建议。     

Crystal growth induced by Nd:YAG laser irradiation in patterning glass ceramic substrates with dots

In this work a glass ceramic substrate was processed by focusing a laser beam inside the said material. The crystal phase within the amorphous matrix provides mechanical properties to the glass ceramic substrate in such a way that dots can be patterned inside the fore-mentioned material without producing any cracks. These marks are made up of crystals, the growth of which has been induced by the laser beam. These inner structures can modify the optical, thermal and mechanical properties of the glass ceramic substrate.A Q-switched Nd:YAG laser at its fundamental wavelength of 1064 nm with pulsewidths in the nanosecond range has been used.Morphology, composition, microstructure, mechanical and thermal properties of the processed material are described.     

声学综合无损检测技术

论述了检测复合材料和胶接结构不连续（缺陷）的新型多模综合无损检测技术。该技术以声与超声检测技术为基础,包含五种不同检测模式,用以检测复合材料与胶接结构的失粘、脱粘、分层、疏松、夹芯压皱及其他缺陷。它适用于复合材料与构件的制造、维修和使用现场。它的适用对象范围广泛,几乎覆盖了现有常用的复合材料和胶接结构。它的检测可靠性高,重复精度好。文章还讨论了组成多膜声学综合胶接检测仪的五种不同检测模式的原理,并从我们和国内外同行的大量实践经验出发,说明了综合无损检测技术的巨大发展前景。     

Simulation of aerodynamic performance affected by vortex generators on blunt trailing-edge airfoils

An investigation was carried out by numerical simulation on a wind turbine airfoil and a blunt trailing-edge airfoil with and without vortex generators (VGs), and the performance of the airfoils was analyzed. By the simulation of airfoil DU 91-W2-250 it was verified that the numerical method and model were credible. Based on this airfoil, a new one with a blunt trailing edge of 6% chord was blended by symmetrically adding thickness, and its characteristics curves were obtained through computing at key angle...     

Correction and evaluation of the effect due to parasitic motion on primary accelerometer calibration

Primary accelerometer calibration is carried out under the assumption that a vibration exciter gives a rectilinear motion to an accelerometer to be calibrated. However practical vibration given by the vibration exciter includes parasitic motion such as transverse, rocking, and bending motion. Such parasitic motion would give two serious effects on primary calibration results, transverse motion effect and vibration distribution effect. Transverse motion effect is caused by an inner product of the vectors of both transverse motion and transverse sensitivity. On the other hand, the vibration distribution effect is caused by relative motion between a sensing point of accelerometer and a spot sensed by the interferometer. As these effects have close interaction between parasitic motion and measuring instruments, it would be very difficult to evaluate them by measuring independently each component.     

超声振动辅助等离子沉积成形的研究

介绍了等离子沉积成形的原理、应用及其存在的优缺点,从超声原理出发介绍了超声振动对等离子沉积过程中晶粒及组织的影响,并设计了超声振动辅助等离子沉积成形的实验装置,对实验过程中以及该实验可能涉及的问题进行了探讨.     

单支撑超超临界1000 MW汽轮发电机组振动诊断及处理

单支撑超超临界1 000 MW机组在浙江已投产8台,逐渐成为电网的主力机组,其安全运行直接关系到电网的稳定,而振动是影响机组安全运行最主要的参数之一。通过对浙江省内已投产的8台1 000 MW汽轮发电机组常见振动问题的诊断处理,分析不稳定振动的产生原因,并对补汽阀投运产生的振动、励磁机过临界振动大等问题进行了阐述,为同类机组振动问题的处理提供参考。     

480t/h电站煤粉锅炉振动原因探讨及对策

针对一台150 MW机组480 t/h超高压锅炉在运行中出现的振动现象,运用加速度计对振动的振幅和频率进行了测量,分析了振动产生的原因,并提出了消除该振动的方案,包括刚性梁的加固和引出管道支撑的加强,效果良好.     

工作转速下汽轮发电机转子同相振动故障分析

发电机转子在工作转速下的振动故障中,其同相的振动故障较为少见,故障的判断与处理比较困难,为此对这类振动进行初步探讨,列举几个成功处理的案例,并提出了有效的解决方法。     

基于AT89S52的振动数据采集系统

本文介绍了一个基于AT89S52的振动数据采集系统。该系统用单片机控制891型拾振器对结构振动信号进行采集,并将采集到的数据经过处理,通过串口发送到PC机。文中对系统的硬件组成结构予以详细介绍,并给出了软件流程。