The fan vibration that is based on vector is monitored with diagnose

2+5 document label piles up: B article number: 1006-8155 (2005) 05-0061-02Abstract: Theconceptandmeasuringmethodofvibrationsignalphaseisintroduced.

Theconceptofvibrationvectorisputforward.

Successfulbalancemethodwithtrialweightforonlyonetimeissummarizedbyvibrationtroubleexamples.

Itisconcludedthatphaseisveryimportantforvibrationanalysis.

Keywords: FanVibrationPhaseDiagnosis1 foreword vibration affects the safe stability of fan to move directly, serious when the happening that still can cause the malign accident such as equipment breakdown. When undertaking monitoring to fan vibration, the manufacturer takes oscillatory amplitude seriously only mostly, monitor as vibration with oscillatory size namely, the basis that analysis and condition detect. Although this kind of method is effective below most circumstance, but fall in a few special situations, can mask oscillatory phenomenon however, cause the misunderstanding of technical personnel. As the development of contemporary test technology, oscillatory and phasic measurement the technology is more and more reliable already. Technical personnel passes vibration phasic measure, the understanding to oscillatory problem will be deepened greatly. Article union author is treated breakdown of vibration of machine of a few typhoons, introduced to be based on oscillatory amplitude and phasic vector to monitor model and phasic the importance in oscillatory analysis. 2 phasic concepts and measurement technique are shown 1 times like the graph, one gap drives on runner shaft coming back, aim runner shaft with eddy current sensor, when the breach on the axis turns to eddy current sensor to be in, the pulse that if the graph is shown 1 times,eddy current sensor can produce is outputted. Measure axial vibration with oscillatory sensor at the same time, get corresponding shaft brace up signal, compare an axis brace up signal and pulse signal, beg a pulse to arrive ever since bits of oscillatory signal is the biggest differential seat angle between, it is with this namely phasic. The generation of key photograph pulse is OK also glance through black Qihe is being brushed to stick on runner shaft belt, the method that uses photoelectricity sensor photoemission will get. When the notional vibration of 3 oscillatory vector is monitored, the manufacturer takes oscillatory size seriously only mostly. After vibration exceeds set threshold value, begin to call the police or stop automatically machine. This kind of method is an oscillatory problem simplification actually, come to oscillatory quantity as a scalar quantity namely look upon. Had phasic hind, still have point of view besides size to the understanding of oscillatory problem. If the graph is shown 2 times,right now vibration can use " target pursues " will express. Oscillatory problem from this and make concept of a vector. In turbine machinery vibration is monitored in, already a few countries use the vector model that combines oscillatory amplitude and point of view to undertake monitoring to aircrew. This kind of method is with some area serves as place of safety, outside once oscillatory vector is nodded,falling to place of safety, aircrew can call the police or take protective action. After compressor of some axial shedding heavies repair, the case of 4 fan vibration analysis that are based on oscillatory vector switch on the mobile phone, in moving, discover vibration is bigger. This machine vibration often is in 50 ～ change between 70 μ M. Control in 20 μ M considering oscillatory change extent, and oscillatory base is 50 μ M, slant apparently big, think this machine vibration just balances a problem simply at first. But when should checking to the spot, discover the circumstance differs completely. Does aircrew switch on the mobile phone? The oscillatory change inside H expresses OK and simply to be 60 ∠ 50 ∠ of 90 ° → 70 ∠ of 180 ° → 260 ° . Although the change of oscillatory amplitude is in 70 μ of 50 ～ between M, metabolic range is not big, but considered phasic hind, discover oscillatory change range is very big, achieved left and right sides of 130 μ M. For certain not just lopsided breakdown causes so big change range. Open aircrew to check discovery, rotor attrition of two upright sealing gland is very serious, rotor surface is local grind hair is bluely. Check discovery further, rotor tilts in air cylinder, those who adjust rotor and air cylinder is homocentric after spending, switch on the mobile phone again, oscillatory and smooth, experiment through dynamic balancing, make move achieve stability. The 5 dynamic balancing that are based on oscillatory vector accentuate the law is current, dynamic balancing of fan of a lot of enterprises works to still use a convention at 3 o'clock law. This kind of method requires a basis only oscillatory amplitude, through be in rotor is circumferential the method that on 3 azimuth try accentuation will decide dynamic balancing deserves to weigh. Although this kind of method looks simple, but aircrew need is opened repeatedly stop for many times, not only take time, arduous, and dynamic balancing precision also is not very tall. Had phasic hind, can by vibration phasic and computative a lopsided place angle. To in an attempt to shows sensor 3 times to decorate for exemple undertake an analysis. Of phasic report is oscillatory signal high point lag believes the angle between date at key, accordingly, by oscillatory sensor changeover a phase angle, can find vibration to nod P high. By oscillatory theory knowable, unbalance always is lead vibration orders part of a lag high, accordingly by clockwise of high point P horn of a lag, can find Q of lopsided location position. The opposite side T of buy of lopsided place v/arc be on the throne should add a balance to match serious place namely. Hypothesis vibration is phasic 45 ° , take lag part 90 ° , by the graph 3 knowable, real aggravating position namely for 225 ° are in changeover of mark of photograph of the key on runner shaft. Use this kind of method, the accuracy rate that spot dynamic balancing succeeds can amount to 70 ％ above, decreased to switch on the mobile phone greatly frequency and working intensity. According to experience, when dynamic balancing experiments, it is important that the angle that tries accentuation has a competition aggravating size wants much, and the angle that tries accentuation depends on directly oscillatory phase angle. Try aggravating angle correct, aggravating around vibration can have apparent change, ever since dynamic balancing process also can be begun very smoothly. 6 conclusion are phasic it is a very important parameter in oscillatory analysis. Had phasic hind, people develops vector from scalar quantity to the understanding of oscillatory problem. Associated vibration amplitude and phasic oscillatory vector monitor a law to monitor the happening of oscillatory breakdown and development process early, in order to deepen the understanding of pair of oscillatory problems. Had phasic hind, technical personnel can realize accentuation of pair of lopsided breakdown, can reduce the workload that dynamic balancing works greatly, also can raise dynamic balancing precision greatly at the same time. CNC Milling