查询词典 abnormal state

The effect of tribology factors on bearing vibration is studied experimentally. AR model and WPT are used to processing the normal arid abnormal signals. The results are as follows:1. The vibration of ball bearings is caused by the tribology action of contact pairs of ball and ring races and has the essential of tribo-dynamics. Any factors affecting the tribology characteristics of contact pairs will affect vibration and noise of bearings consequently.2. Vibration characteristics of bearing keep almostly unchanged with the increasing of axial load expecting the increasing of nature frequencies. When radial load increasing with axial load unchanged, nature frequencies keep unchanged but some new vibration peaks appears in the spectrum.3. Vibration amplitudes are damped and nature frequency are enhanced with sufficient lubrication. Vibration and noise of bearings increase obviously and roar can happen and the contact surfaces scratch slightly under insufficient and unclean lubrication state. Bearing will be disabled in a few minutes without any lubrication.4. Bearing vibration is unstable under low speed. With the speed increasing, the vibration become stable and natural frequencies increase slightly but the amplitudes increase apparently.5. Bearing vibration can be excited only by some harmonics ofwaviness without lubrication and by all harmonics with lubrication based on the theoretical analysis.6. The nature frequencies of ball bearings decrease with the increasing sizes. When international clearance increasing, nature frequencies decrease in radial and increase in axial and angular and the amplitudes increase in radial and decrease in axial and angular. When the number of balls increasing, nature frequencies increase and amplitudes decrease. When the pitch diameter increasing, axial nature frequency increase and others nearly keep no change. When outer race groove curvature radius increasing, nature frequencies increase in radial and decrease in axial and angular and amplitudes keep no change in radial and increase in axial and angular. When inner race groove curvature radius increasing, nature frequencies decrease and amplitudes increase.7. The distortion in amplitude and frequency components of bearing vibration signals picked up by the present probe measurement method is founded and right conclusions cannot be achieved by the signals. When accelerometer is rigidly screwed with steel stud onto a flat outer surface of a ball bearing, vibration signal can be got without distortion and the reliability of research on bearing vibration is assured.8. AR model is suitable for large samples of bearing vibration signals, square root of length of samples can be used as the upper limitation of order determination and the FPE order selection criterion is effective. Many advantages of AR spectrum are founded over the classical based on FFT.9. Time-Frequency analysis is necessary for abnormal noise of ball bearings. WPT overcomes the principle shortcomings of STFT and proved to be a best tool to process the abnormal signals.

理论分析和试验研究表明： 1球轴承振动是钢球—滚道接触副中的各种摩擦学作用引起的，具有摩擦动力学的本质，任何对接触副的摩擦学特性有影响的因素都将对球轴承的振动和噪声特性产生影响； 2中心轴向载荷作用下，载荷增大使球轴承的固有振动频率升高，载荷越大同样的载荷增幅引起的频率升幅减小，足够大的中心轴向载荷作用下载荷的变化对球轴承振动的频率特性不会产生明显的影响； 3轴向和径向联合载荷作用下，径向载荷不大时球轴承振动的固有频率基本不变，但是可能引起变刚度激励的非线性振动，出现新的频峰，过大的径向载荷将使部分钢球脱离接触，使球轴承的振动和噪声呈现不稳定状态； 4润滑对球轴承的振动和噪声特性有重要的影响，良好的润滑对振动有明显的抑制作用，润滑不充分时，振动和噪声的水平会有明显增高，一定条件下还会激发接触副中的谐振，发出啸声，造成接触表面的伤害，无润滑干接触时，短时的运转就会损伤接触副表面，使振动和噪声迅速增大，并随时可能引发严重的磨损和卡滞失效；接触副润滑良好时，油膜的"刚化效应"使球轴承振动的固有频率有所提高，润滑剂中含有弥散性污浊时，振动的幅度总体升高，但弥散性污浊不会改变球轴承振动的频率特性；浙江大学博士学位论文：球轴承振动的研究 5低速时，球轴承振动的基本特征呈现不稳定状态，随着转速的提高，球轴承振动的频率特性趋于稳定，固有频率频峰升高； 6理论分析表明，干接触时钢球和滚道表面波纹度的某些谐波分量能激励球轴承的振动，振动的幅值与谐波幅值成正比，实际球轴承中钢球的分布不可能完全均匀，波纹度的激励作用会随时发生；润滑接触的分析表明，波纹度的任意谐波分量均能激励球轴承的振动； 7球轴承的几何和结构参数分析表明，球轴承尺寸越大，径向、轴向和角振动的固有频率越低；钢球中心圆直径增大，球轴承的径向和轴向振动的固有频率基本不变，角振动的固有频率有所上升，振动的幅频特性基本不变；径向游隙加大使球轴承的径向振动固有频率降低，轴向和角振动的固有频率有所升高，径向振动幅频特性的幅值升高，而轴向和角向降低；钢球的数量增多使球轴承振动的固有频率上升，幅频特性的幅值下降，径向振动的幅值下降最为明显；外圈沟曲率半径系数增大使球轴承径向振动的固有频率升高，轴向和角振动的固有频率降低，径向幅频特性基本不变，轴向和角向幅频特性幅值升高；内圈沟曲率半径系数增大使径向、轴向和角振动固有频率均下降，振动幅频特性的幅值均有升高； 8试验对比表明，传感器采用探针式安装时，由于探针接触副接触特性的影响，钡(量得到的球轴承振动信号有失真，采用专门设计和制作的试验球轴承，以固定式安装加速度计，首次测量得到了球轴承振动的真实信号，通过对振动信号的分析，验证了球轴承振动的理论模型； 9)基于时间序列分析的AR模型适用于大样本球轴承振动信号的分析，以样本长度的均方根值作定阶上界，FPE做判阶准则，给出的AR谱光滑，频率分辨率高，是球轴承振动分析的简便而可靠的手段； 10以时频域分析的小波包变换分析球轴承异音信号能够比较好地定位和聚焦异音发生的时间，时间间隔，频率范围，同样是球轴承振动分析的可靠的手段，可用作球轴承故障诊断技术。

At first, with the low-frequency data measured, three of the LRE fault detection systems for the real-time condition are proposed using the nonlinear identification technology of the BP neural network, the state estimation technology of the dynamic neural network, and the pattern recognition technology of the fuzzy hypersphere neural network. The learning algorithms of the BP and dynamic neural network are researched at the same time. Furthermore, while the engine operation is divided into the start and steady-state processes, the real time ability, the response time, the accuracy, the robustness, the sensitivity and the monitoring parameter optimization are studied. In the test data analyses of the YF-75 engine, the detection system correctly carried out for all normal tests, and in the three abnormal tests the engine faults were accurately forecasted.

首先，基于低频测量数据，采用BP神经网络的非线性辨识技术、动态神经网络的状态估计技术及模糊超球神经网络的模式识别技术，提出了三种发动机故障实时检测系统；同时研究了BP神经网络和动态神经网络的学习算法；另外还把发动机工作分为启动过程和稳态过程，分别讨论了神经网络故障检测系统的实时性、及时性、准确性、鲁棒性、敏感性及参数优化问题；在YF-75发动机试车数据分析中，不仅全部正确地监测了正常试车过程，而且准确地预报了三次异常试车中的发动机故障。

When the market price overall level appearsthe fierce undulation and so on the abnormal state, the State Councilmay adopts the temporary centralism fixed price jurisdiction, the partor the comprehensive freeze price urgent measure in national scope orin the partial regions.

当市场价格总水平出现剧烈波动等异常状态时，国务院可以在全国范围内或者部分区域内采取临时集中定价权限、部分或者全面冻结价格的紧急措施。

A novel approach for abnormal work condition recognition of internal combustion engine valve drain by monitoring vibration is proposed based on multivariate state estimation techniques and sequential probability ratio test.

提出了一种基于多元状态估计(Multivariate State Estimation Techniques， MSET)和序贯概率比检验(Sequential Probability Ratio Test， SPRT)的内燃机气阀机构振动监测方法。

The electron ballast device of high voltage sodium lamp is a kind of product with high conservation effective、 and green environment protection, which has the characteristics of high reliability and protection function in abnormal state.

高压钠灯电子镇流器是一种高效节能、绿色环保型产品，具有高可靠性，异常状态保护等特点。

However, the institution of laws providing social safeguards in China on a whole is straggling or in an abnormal state.

但从总体上看，我国的社会保障立法仍处在滞后和非正常状态。

The empirical result demonstrates that:(1) the average abnormal reture and accumulated average abnormal reture around and after quarter surplus announcement change obviously, which illustrates the quarter surplus reports are of information content in our A share market;(2) the market can treat different types of accounting surplus data distinguishly by analysing inexpectant surplus as good news or bad news, but it reacts intensely to good news and flatly to bad news:(3) the market investors are paying more and more attention on accounting surplus of listed companies, which can be viewed in the annual text that the surplus reaction coefficient significance enhances;(4) A share market is, basically, under a state of semi-strong efficiency, or at least of an effective process from weak to semi-strong.

实证结果表明：(1)季度盈余报告公布前后平均非正常收益率和累积平均非正常收益率都发生了明显的变化，说明在我国A股市场季度盈余报告是具有信息含量的；(2)通过对未预期盈余分为利好组和利空组的分析，得出市场能够区别对待不同性质的会计盈余数据，但是市场对利空消息反应强烈，对利好消息反应平淡；(3)在分年度的检验中，可以看到盈余反应系数的显著性不断增强，证明我国A股市场的投资者对于上市公司会计盈余的重视程度在不断增加；(4)研究结果倾向于我国A股市场基本处于半强式效率，至少我国证券市场正处在从弱式有效向半强式有效转变的过程中。

The theoretical innovation is that endogenous uncertaintytheory is first introduced to explain the abnormal volatility of Chinese stock markethence making the analysis of abnormal volatility more reasonable. The econometricalinnovation is that state space model is introduced to improve the classical test modelmaking the econometric test more practical and more convictive.

在中国股市异常波动性成因的理论分析中，首次将内生不确定性作为其中的一个重要因素，使得对中国股市异常波动成因的分析更为合理；在内生不确性的实证研究中，根据股市的实际情况，引入状态空间模型，对经典的检验模型进行改进，使得实证检验结果更具说服力。

In his play The Glass Menagerie, A Streetcar Named Desire, Summer and Smoke, Cat on a Hot Tin Roof, owing to Tennessee Williams's own life experience in the South, he portrayed a group of young women of the South, who are lonely, chill, coward and abnormal state of mind, and he demonstrated that these women, called the last aristocrats, could not adapt to the changes of the regime, and he also showed us the conflict between the old South culture and the modern culture as reflected in the women characters.

在他的作品《玻璃动物园》《欲望号街车》《夏天和烟》《热铁皮屋顶上的猫》等著作中，他以本人南方为背景，以细腻、委婉而有饱含同情的笔触刻画了1群孤独、失意、怯懦而心灵扭曲的女性形象，揭示了这批旧南方遗留下来的&最后贵族&在社会制度更迭时无所适从的心理。

In his play The Glass Menagerie, A Streetcar Named Desire, Summer and Smoke, Cat on a Hot Tin Roof, owing to Tennessee Williams's own life experience in the South, he portrayed a group of young women of the South, who are lonely, chill, coward and abnormal state of mind, and he demonstrated that these women, called the last aristocrats, could not adapt to the changes of the regime, and he also showed us the conflict between the old South culture and the modern culture as reflected in the women characters.

在他的作品《玻璃动物园》《欲望号街车》《夏天和烟》《热铁皮屋顶上的猫》等著作中，他以本人南方为背景，以细腻、委婉而有饱含同情的笔触刻画了一群孤独、失意、怯懦而心灵扭曲的女性形象，揭示了这批旧南方遗留下来的&最后贵族&在社会制度更迭时无所适从的心理。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。