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1.
李欣燃 《中国机械》2014,(20):170-171
无损检测主要用于检查材料及焊接接头的表面及内部质量,可在不损坏材料完整性的前提下,检测出受检部位存在的缺陷。本文对压力容器检验中常用的射线检测、超声波检测、磁粉检测、渗透检测等进行了分析和研究。无论是锅炉压力容器的制造检验,还是定期检验,无损检测都是必不可少的检测手段。  相似文献   

2.
张鲁民 《中国机械》2013,(13):49-49
无损检测是在不损坏,不改变被检测对象理化状态的情况下,对被检对象的内部及表面的结构、查和测试,借以评判它们的连续性,完整性、安全性以及其他性能指标。作为—种有效的检测手段,各种领域,尤其在保证承压类设备产品质量和使用安全方面,无损检测技术显得特别重要。性质、状态进行高灵敏度和高可靠性的检无损检测在我国已广泛应用于经济建设的  相似文献   

3.
居青寿 《中国机械》2014,(22):205-206
我国是农业大国,农机设备的研究和发展已经到了一个非常繁荣的地步各种高科技的农机产品层出不穷。因此,农机检测设备发展已经成为我国农业发展中重要的环节,农机检测设备的研究和发展能够提高农机产品的检测质量。本文简单的介绍了我国农机检测设备的发展之路,深入分析了农机检测设备的应用现状以及不足之处,并针对这个问题,提出了几个参考性的意见。  相似文献   

4.
针对目前轨道手工检测效率低下、检测项目单一和高速轨道检测小车普及率不高的现状,为适应光学视觉检测需要,设计了一种可折叠的轻量化半T形检测小车,以同时满足激光检测和三维结构光检测的需求。为解决普遍存在的轨道检测小车车架与钢轨纵向难以保证垂直的问题,设计了柔性侧压机构,使车架不发生偏移。应用D-H法构建运动学模型,求解机构末端侧压轮的正运动学问题,论证了柔性侧压机构的侧压轮能紧贴钢轨内侧面以适应各种轨道的轨距变化。为小车建立力学分析模型,确保小车在静态下不会侧翻、脱轨,验证了机构设计的合理性。制造了物理样机,并进行了现场试验。结果表明,检测小车运行时垂直度好、自调节能力强,满足检测要求。  相似文献   

5.
通过药品包装生产中几个典型的视觉检测系统的应用案例,介绍了目前药品包装质量控制和检测方面的技术,认为视觉检测系统将会更快地应用到药品企业的生产中。  相似文献   

6.
俞楚勇 《机械制造》2011,49(12):50-51
焊缝检测对保障起重机质量、消除安全隐患有着重要意义。分析了不同的起重机焊缝检测方法的机理、适用性和优缺点,通过合理的焊缝检测流程,选择多种检测方法,采取综合检测的手段,取长补短,实现适用性、高效性和准确性的检测效果。  相似文献   

7.
姚源 《中国设备工程》2023,(14):113-115
石油机械结构检测工作与产业经济效益联系密切,采用高效的无损检测方法有助于提升检测效率,同时也可帮助相关企业降低生产风险。无损检测中,超声波方法因其精确检测的特点成为主要检测方式之一。本文通过探讨石油机械结构检测中存在的问题,表述了无损检测对于石油产业发展的重要性,重点分析了超声波方法在石油机械结构检测中的应用内容。  相似文献   

8.
本文简述了电磁检测硬度的机理,利用电磁无损检测对钢轨双频淬火后的全长连续接触硬度检测进行测试研究,对钢轨纵向硬度的区分度已达到铁道部部标准,对该研究成果转化为生产力进行了初步探讨。  相似文献   

9.
梁秀云 《机械制造》2013,(11):55-57
阐述了无损探伤在工程机械生产中的重要性,概述了几种常见的无损检测方法,对射线检测、超声波检测以及红外无损检测的应用及特点进行分析。以焊缝缺陷、精密铸件内部缺陷、钢板疲劳裂纹位置探测为例,深入探讨了红外无损探伤技术的先进性。  相似文献   

10.
复合材料的多界面脱粘检测技术的研究   总被引:1,自引:0,他引:1  
分析了多界面脱粘检测技术的优缺点,如超声检测、X射线检测及X射线CT检测等。并以壳体构件为研究对象,提出了能够检测壳体构件多界面脱粘的“横波检测技术”原理,对不同厚度构件的壳体/绝热层、绝热层/衬层和衬层/推进剂3个界面进行了实际检测,并给出了脱粘检测结果。  相似文献   

11.
An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...  相似文献   

12.
The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...  相似文献   

13.
黑棣  郑美茹 《机电工程》2016,(11):1315-1321
针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。  相似文献   

14.
The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.  相似文献   

15.
The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....  相似文献   

16.
The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...  相似文献   

17.
马立新  王宏宇 《机电工程》2015,32(1):118-122
针对传统的电力系统多目标粒子群优化算法采用权重系数法将多目标转化为单目标,从而忽视了各目标函数间的竞争关系这一问题,提出将非支配解提取法运用到电力系统多目标无功优化中,并设定了一套提取规则,以电力系统中的有功网损、电压偏差和电压稳定裕度为目标,使目标在充分竞争的情况下得出Pareto最优解,利用IEEE-14节点系统对多目标非支配解提取法的电力系统无功优化进行了仿真测试。研究结果表明,该算法一次运行可以得出多组非支配解,既有偏向单个目标的解也有兼顾所有目标的解,克服了权重系数法的盲目性和单一性,可使电力决策者根据实际问题选择最优解,具有较好的灵活性与多样性。  相似文献   

18.
A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.  相似文献   

19.
This article describes designing, implementation and tuning processes of multiple-tapped-delay-line (MTDL). Obtained MTDL can be implemented in various field-programmable-logic-devices (FPGA) devices and applied for time-to-digital-converters (TDC) construction. The task of tuning process is the tapped-delay-line (TDL) linearisation, and consists of two stages. The first stage depends on selecting an appropriate configurable-logic-block (CLB) for particular delay-segment realization and selecting proper connection between these blocks. The second tuning stage, that is essential from this article viewpoint, depends on inter CLBs connecting wires delay regulation realized directly by load regulation. The Load regulation depends on connecting an appropriate number of unused three-state-buffers or CLB inputs to the wire which delay is adjusted. Depending on the number of inputs connected to the wire its capacitance changes that influences its time-constant and finally changes its time-delay.The MTDL mathematical model, obtained characteristics and results of time-interval (TI) measurements are also presented. The derived TDL model provides information about how the particular wire delay should be changed and in which order the changes should be executed. This makes the designing process predictable and easy to carry out. Presented characteristics confirm the proper operation of presented linearisation technique. The proper operation of the whole measuring module is confirmed by obtained TIs histograms presentation.  相似文献   

20.
针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。  相似文献   

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