共查询到20条相似文献，搜索用时 408 毫秒
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本文介绍了飞机空速管的结构及测量原理,阐述了工作中所遇到的空速管加温失效、漏水孔堵塞及管口堵塞等几类典型故障现象,分析了各种故障现象可能对飞行安全造成的危害。 相似文献
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针对Cessna172R型飞机经常发生的飞机空速管全压管堵塞的故障状况,从多个角度分析了堵塞的危害,并结合该机型堵塞特点,从安全防范的角度提出预防该类型空速管堵塞的几点预防措施。 相似文献
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介绍分析了供热消水力失调引起的故障问题,堵塞引起故障的处理方法,膨胀水箱与系统故障及系统回水温不稳定的故障排除措施. 相似文献
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介绍分析了供热消水力失调引起的故障问题,堵塞引起故障的处理方法,膨胀水箱与系统故障及系统回水温不稳定的故障排除措施。 相似文献
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提出了一种改进的数字化热像航空涡轮发动机的主动红外故障检测方法,通过数字化的热像仪可以对检测数据进行数字化分析,判断故障的类型与故障的位置。采用主动红外故障检测方法的热激励源可以采用多种方式进行,使得检测的对象可以为整块的平面,仿真测试结果表明随着散热系数的不同,导致堵塞处在热像仪的拍摄中出现了明显的温度变化,从而确定了叶片散热通道的堵塞位置,成功地进行了故障判断。主动红外故障检测方法具有较强的航空涡轮叶片故障检测能力,具有广泛的应用前景。 相似文献
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本文介绍了斯达-斯太尔1491/280/K29/6X4型矿用自卸卡车wd615型发动机主油道堵塞故障一例,分别采用了高压气体吹扫,缸体油道清洗等方法,解决了因使假冒伪劣机油滤芯造成发动机油道堵塞故障,具有较高的社会应用价值. 相似文献
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网络并不是一直都保持畅通的状态,也有堵塞或者是故障的时候。在发生故障时就要,要立即查明发生问题的原因,同时要及时的处理故障。检查网络的故障与检查其他的故障不同,需要使用特殊的工具还要输入测试指令。本篇文章主要介绍了在诊断网路故障时常使用的指令。 相似文献
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发动机散热器故障的主要表现是散热不良或水管漏水。主要原因是水管被水垢或冷却水中的污物堵塞,散热片移位、折皱、水管破裂等。一、水管堵塞的清除若水管被水垢或污物堵塞,可将散热器放入含有5％～10％的苏打热水(温度以80～90℃为宜)中进行反复冲洗。如果芯管严重堵塞,则可用钢针进行疏 相似文献
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图书馆管理模式与服务失误发生的概率 总被引：1，自引：0，他引：1
论文阐述了服务失误发生的必然性和高频率,发现和确认服务失误的途径和方式;服务补救的目的和意义;流通部读者服务窗口可能采取的三种不同的管理模式和对应的服务流程;分析了各种管理模式中可能发生服务失败的服务环节;列举了不同模式分别需要的人力和设备资源的配置.最后,总结了图书馆不同管理模式在服务失误发生的概率和工作效率以及服务水平等方面的投资效益是不同的,因而其先进性也有差异;指出了管理者应根据图书馆在结构布局等方面的不同采用与之相适应的管理模式. 相似文献
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本文介绍了齿轮振动信号的时域分析与频域分析的理论基础。针对齿轮常见故障原因和类型,引出了齿轮故障诊断的常用方法,并选用经典的振动分析法,利用MATLAB信号分析功能,对齿轮故障信号的时域和频域分析进行了详尽的阐述。本文对齿轮故障诊断有一定的指导意义。 相似文献
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变频器在日常生活中的应用已经随处可见,但很多人对它的认识就只是变频而已。事实上,它在改变频率的同时还具有一定保护功能。了解各类变频器的保护功能,对于正确使用变频器及故障的排查非常重要。本文主要详细介绍变频器在运行过程中的过电流保护功能、过载保护功能、过电压保护功能、欠电压的保护功能。 相似文献
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技术创新失败是普遍的，又是有特殊价值的，但鲜有研究探讨经历失败的创新团队如何才能继续启动创新行为，以保障企业的持续发展。本文构建了团队技术创新失败、失败复原与连续创新行为的关系模型，分析了团队创新激情的调节作用，以62个团队共346位曾遭遇技术创新失败的团队成员为研究样本采用回归分析对理论假设进行检验。研究发现，技术创新失败的次数和程度与连续创新行为呈倒U型关系；创新失败复原分为问题应对和情绪应对两个维度，在技术创新失败与连续创新行为之间发挥部分中介作用，失败复原的成效直接关系到失败者能否重启创新、取得创新成功；团队创新激情调节了创新失败复原与连续创新行为之间的关系。从创新团队组建与治理、创新失败管理、团队情绪管理、政策配套四个方面提出对策建议，以期为遭遇失败的创新团队提供理论与实践指导。 相似文献
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A transaction log analysis of the Nanyang Technological University (NTU) OPAC was conducted to identify query and search failure patterns with the goal of identifying areas of improvement for the system. One semester’s worth of OPAC transaction logs were obtained and from these, 641,991 queries were extracted and used for this work. Issues investigated included query length, frequency and type of search options and Boolean operators used as well as their relationships with search failure. Among other findings, results indicate that a majority of the queries were simple, with short query lengths and a low usage of Boolean operators. Failure analysis revealed that on average, users had an almost equal chance of obtaining no records or at least one record to a submitted query. We propose enhancements and suggest future areas of work to improve the users’ search experience with the NTU OPAC. 相似文献
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智能电力系统故障录波仪是一种数据采集记录装置,它可以记录系统非正常和正常状况下系统电压、电流、频率的变化。在电力系统正常运行情况下记录的数据,对于分析电力系统正常运行下电能的应用情况起着重要的作用;而故障阶段记录的数据,对于分析电力系统故障发生的原因,以及帮助寻找故障发生点,从而迅速处理相关故障事故起着关键的作用。 相似文献
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The new product learning cycle 总被引：1，自引：0，他引：1
This paper summarizes our extensive study (n = 158) of new product success and failure in the electronics industry. Conventional “external factor” explanations of commercial product failure based on the state of the economy, foreign competition and lack of funding, were found not to be major contributors to product failure in this industry. On the other hand, factors that can be strongly influenced by management such as coordination of the create, make and market functions, the quality and frequency of customers' communications, value of the product to the customer, and the quality and efficiency of technical management explained the majority of the variance between successful and unsuccessful products. From these findings a framework for understanding and managing the new product development process that places learning and communication in the center stage was developed.Successes and failures in our sample were strongly interrelated. The knowledge gained from failures was often instrumental in achieving subsequent successes, while success in turn often resulted in unlearning the very process that led to the original success. This observation has led us to postulate a new product “learning cycle model” in which commercial successes and failures alternate in an irregular pattern of learning and unlearning. 相似文献
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G.M.L. Sommerman 《Journal of The Franklin Institute》1935,219(4):433-458
The presence of maxima in the power factor-frequency and power factor-temperature curves of dielectrics has been explained by the Maxwell inhomogeneity theory and the Debye theory of polar molecular orientation. In order to ascertain the true cause of these maxima, a study has been made of the power factor of an essentially non-polar material with and without polar materials in dilute solution over extended ranges of frequency, 65 to 7.2 × 106 c.p.s., and temperature, 2.9° C. to 90° C.The non-polar solvent is a mixture of paraffins having a pour point at 55° C. Small power factor maxima, 0.0003 in value, shifting over the audio frequency range with temperature variation, are observed for this solvent alone. Adding 3 per cent. phenol gives rise to molecular orientation maxima restricted largely to frequencies above 107 c.p.s. At the lower temperatures, these maxima are greatly broadened, so that there is apparently a small contribution at power frequencies. Adding 10 per cent. stearic acid gives similar results. The failure of these maxima to shift to lower frequencies at the lower temperatures is due to the failure of the inner viscosity to increase very much in the solid state. The variation of the inner viscosity is calculated from the reciprocals of the short time conductivities since the degree of ionic dissociation is found to be essentially independent of temperature. The viscosity may be regarded as a function of particle size and varies within the medium. Where power factor maxima shift with essentially undiminished magnitude over a wide frequency range at ordinary temperatures, such as those observed here in the solvent above, it is believed that the cause is the orientation of associated or polymerized polar aggregates of such size as to be affected by the larger viscosity changes approaching the macroscopic.In the solid and amorphous states, the limited motion of ions leads to an ionic polarization as indicated by absorption curves of relatively large time constants and by high power factors in the low frequency range. The addition of organic acids greatly increases these effects and also increases the final conductivity. The true short time conductivity is largely caused by almost completely dissociated inorganic material. 相似文献
