英文翻译2Word文件下载.docx

1、（1） Vibration frequency; （2） Harmonic vibration, for example, two octave, 3 octave vibration;（3） The entire baseband frequency scores （such as 1 / 2, 1 / 3, etc.） of the vibration;（4） Frequency and baseband into the relationship between a certain percentages （eg 38% 49%） of the vibration;（5） ultra-l

2、ow-frequency （vibration frequency 5Hz below） vibration;（6） Ultra-high frequency （vibration frequency in 10 kHz and above） Vibration2. Amplitude direction according to classification （1） Diameter （horizontal） to the vibration that is the direction along the shaft diameter of the vibration is generall

3、y divided into horizontal vibration straight vibration. （2） Axial vibration, that is, the direction along the axis of vibration cutting;（3） Tensional vibration, that is, the vibration along the shaft rotation direction.3. by vibration of the reasons for classification （1） The vibration caused by rot

4、or imbalance;（2） Shaft misalignment caused by vibration;（3） Sliding bearing and crankshaft vibration caused by eccentricity;（4） The machine parts caused by loose vibration;（5） Friction （such as seal friction, the rotor and the stator friction, etc.） caused by vibration;（6） Bearing damage caused by v

5、ibration;（7） Sliding bearing oil whirls and oil whip caused by vibration;（8） Air power and hydraulic vibration caused by factors such as;（9） Bearing stiffness asymmetry caused by vibration;（10） Electrical aspects of the reasons for the vibration caused by4. Vibration occurred by the site classificat

6、ion （1） Rotor or shaft （including the journal, shaft profile vane, etc.） vibration;（2） Bearings （including the film sliding bearings and rolling bearing） vibration;（3） Shell, bearing vibration;（4） Infrastructure （including aircraft seats, table, or bracket, etc.） vibration;（5） Other areas such as va

7、lves, pipe stem, and a variety of structural vibration, etc.In addition, if according to the characteristics and forms of vibration, but also separation of synchronous vibrations （forced vibration） and sub-synchronous （self-excited vibration）, etc. Due to vibrations caused by the failure of its mani

8、festations are diverse, in order to accurately identified the cause failures cause - generally speaking, have to rely on signal processing techniques and vibration theory, and other modern methods and means to conduct a comprehensive and integrated analysis and in accordance with the gradual accumul

9、ation of experience in the specific circumstances, the only way to achieve fault diagnosis success. Failure of rotating machinery and therefore must be characterized by research.2.2 The characteristics of rotating machinery fault The implementation of fault in the dynamic monitoring of rotating mach

10、inery, we must pay attention to other features:2.2.1 Rotor FeaturesThe rotor component is the core of rotating machinery and equipment, which is fixed by the shaft and the installation of various types of circular discoid components （such as coupling, bearings, impeller, gear, balance disk, pulley,

11、wheel, flywheel, etc.）, formed. As the entire rotor in high-speed rotation movements, so its manufacture, installation, commissioning, maintenance and management have a very high demand. If you had problems with one of these components, or in connection with a change in part an exception occurred, t

12、hey immediately drew a strong vibration unit. It can be said of dynamic monitoring rotating machinery monitoring and diagnosis is mainly the rotor state of motion.2.2.2 The frequency characteristics of rotating machinery vibrationMost of rotating machinery vibration signals is periodic signals, quas

13、i-periodic signal, or a stationary random signal. Failure of rotating machinery vibration characteristics have a common point, namely, the failure of their characteristic frequency related with the rotor speed is equal to the rotor rotation frequency （referred to as transfer frequency, also known as

14、 frequency） and its octave or sub-frequency. Therefore, the analysis of vibration signals of the frequency and turn the relationship between the frequencies of rotating machinery fault diagnosis of a key.2.2.3 for rotating machinery vibration monitoring the main wayVibration signal analysis is the b

15、asic method for monitoring rotating machinery, the main three-pronged approach to obtain monitoring information1. Analysis of rotating machinery vibration frequency of each type of fault has its own characteristic frequency at the scene to make the frequency of the vibration signal analysis is the d

16、iagnosis of rotating machinery of the most effective method. Frequency speed of rotating machinery is like a military demarcation line, the entire band is divided into sub-and super-asynchronous asynchronous vibration frequency of vibration of two sections, to seize this point, helps us to analyze a

17、nd judge the fault2. Analysis of amplitude and direction of features in some cases （certainly not all occasions） different types of rotating machinery fault vibration on the performance characteristics of a clear direction. Therefore, the vibration of rotating machinery measurements, as long as cond

18、itions permit, the general measure of each measuring point should be horizontal, vertical and axial three directions, as in different directions to provide us with a different fault information. Leakage measured in one direction, you may lose a message.3. Analysis of the relationship between the amp

19、litude changes with the speed of a considerable portion of rotating machinery fault vibration amplitude and speed changes are closely related, so on-site measurements, when necessary, to create conditions for as much as possible, in the process of changing the speed amplitude measurement of the mach

20、ine value.2.3 Rotating Machinery Vibration Fault Diagnosis As mentioned earlier, equipment fault diagnosis is essentially a pattern classification are based on test analysis obtained on the state information, and grouped into a certain type of equipment failure. Therefore, the characteristics of eac

21、h type of fault must have sufficient understanding. Equipment diagnostics development today, the people through a large number of experimental studies and a wide range of diagnostic practice, for a variety of devices （especially rotating machinery） of the failure mechanism, fault type and its charac

22、teristics have a considerable understanding of understanding. Statistics show that, with the production of a different nature, the type of equipment used is also different, so the proportion of various types of failures is also inconsistent. Here are several common fault diagnosis of rotating machin

23、ery vibration characteristics, diagnostic methods and examples.2.3.1 ImbalanceAccording to the information that various types of rotating machinery failure due to imbalance of about 30%, we can see that the machine rotor imbalance caused by rotating machinery vibration is a common multiple faults. T

24、o fully understand and grasp the characteristics and mechanism of unbalanced fault diagnosis is very important.1. The causes of imbalances caused by rotor imbalance are many reasons, such as: unreasonable because it is designed geometry caused by different heart, or deviate from the geometric center

25、 line of rotary valve shaft; Manufacture, installation error; Rotor material uneven, or heat unevenly; Rotor initial bending; Work medium in the solid impurities in the rotor on the uneven deposition; Rotor in the course of corrosion, wear and tear; Rotor parts loose, fall off.2. Rotor imbalance may

26、 lead to consequences for the flexible rotor may also generate additional degree of damage due to dynamic inertia of the centrifugal force caused by imbalance. For various reasons caused by rotor unbalance fault is a basically the same pattern. To sum up, the rotor imbalance may lead to the followin

27、g undesirable consequences:（1） The rotor caused by repeated bending and internal stress, causing the rotor fatigue, even lead to rotor fault;（2） To enable the machine in operation during the excessive vibration and noise, so that it will accelerate the wear of bearings and other components to reduce

28、 life expectancy and efficiency of the machine;（3） Through the vibration of the rotor bearings, machine transmits to the base blocks and buildings, resulting in deterioration in working conditions.3. Rotor imbalance generally include the following four cases（1） Static unbalance;（2） double-sided imba

29、lances;（3） Static and dynamic imbalance;（4） Dynamic imbalance. for example:2-1:Among them, static imbalance is an imbalance in the cross section, while the remaining three kinds of imbalance is an imbalance on the number of sections, and each inspired by a cross-section due to imbalances in the lateral vibration and static unbalance is the same as the mechanism of. In other words