In most cases this is not significant. Turbines a gaz a paliers a film fluide Title in German Mechanische Schwingungen. Take the smart route to manage medical device compliance. Examples of these types of machines are small, direct-coupled, electric motors and pumps, production motors, medium motors, generators, steam and gas turbines, turbo-compressors, turbo-pumps and fans. The most popular browsers are,and.
Such changes can be instan- taneous or progressive with time and may indicate that damage has occurred or be a warning of an im- pending failure or some other irregularity. The frequency range will depend on the type of ma- chine being considered e. The reasons for this are briefly discussed in annex A, which also defines some precise relation- ships between the above quantities when the har- monic content of the vibration waveform is known. Evaluation des vibrations des machines par mesurages sur les parties non tournantes. For instance, not all types of bearing defect can be identified by any one technique and, whereas a particular technique may be perfectly satisfactory in identifying major bearing problems on one machine, it may be totally unsuitable for other installations. The standard defines overall velocity alarm levels four groups of iso 10816-3, which are ranged according to their size and base foundations. Consequently, acceptance criteria based on velocity will take the general form of figure6.
A significant increase or decrease in broad-band vibration magnitude may occur which re- quires some action even though zone C of Criterion I has not been reached. If the vibration evaluation is based on more than one measurement quantity i. Subscription pricing is determined by: the specific standard s or collections of standards, the number of locations accessing the standards, and the number of employees that need access. Iso 10816-4 pdf Gas turbine sets with fluid-film bearings This product falls into following categories. Because of the sharpness of the shock pulses, they contain components at very high frequency. A further technique is the spectral analysis of envelope waveforms which are generated by rectifying and smoothing of high-pass filtered vibration signals or bandpass filtered in the high frequency range.
Iso 10816-4 pdf Iso 10816-4 pdf Iso 10816-4 pdf Evaluation of machine vibration by measurements on non-rotating parts. The evaluation criteria relate to both operational monitoring and ac- ceptance testing, and they apply only to the vibration produced by the machine itself and not to vibration transmitted from outside. In this case it is important to ensure that all the major components of the machine and structure are installed when testing is carried out. These can be supplemented by a measurement of axial vibration. This, therefore, can give not only recognition that a bearing is giving con- cern, but can also identify the nature of the defect. Evaluation of machine vibration by measurements on non-rotating parts. In addition, different criteria are provided for transient operating conditions, such as run-up and coast-down.
Learn more about the cookies we use and 100816-1 to change your settings. Significant changes from the normal vibration magni- tudes should be investigated so that a dangerous situation may be avoided. These include acoustic noise analysis, thermography and wear- debris analysis ferrography , but none can be claimed to be successful in all cases or even applicable in some instances. It is desirable that the measurement system should have provision for on-line calibration of the readout instrumentation and, in addition, have suitable isolated outputs to permit further analysis as required. Sign up or iso 10816-1 in Sign up using Google. The axis of the rotating shaft may be horizontal, vertical or inclined at any angle. The maximum vibration magnitude ob- served at each bearing or pedestal is assessed against four evaluation zones established from international experience.
A-3 The operation of interchanging vibration acceleration, velocity or displacement values can be accomplished only for single-frequency harmonic components using, for example, figure A. For nearly all machines, re- gardless of the type of bearings used, measurements of the broad-band r. For most machine types, one value of vibration se- verity will characterize the vibratory state of that ma- chine. Generally, there is no simple relationship between broad-band acceleration, velocity and displacement; nor is there between-peak O-p , peak to peak p-p , root mean square r. In other cases the vibration sensitivity may be such that although the vibration magnitude for a particular machine is satisfactory when measured under certain steady-state conditions, it can become unsatisfactory if these conditions change. An alternative technique is the spectral raw shock-pulse envelope.
These alternatives are: a measurement of peak acceleration values; b measurement of the peak-to-r. If the peak-to-peak displacement values of the vi- bration, sl, s2,. The standard informs maintenance personnel about the machine condition, serves as an acceptance criterion for machine iso 10816-3 and provides the machine buyer with a relevant quality indicator. Typical measurement locations are shown in figures 1 to 5. Additional vi- bration measurements that may be taken under other conditions are not applicable for evaluation in accord- ance with clause 5.
The evaluation criteria relate only to the vibration produced by the machine itself and not to vibration transmitted to it from outside. The following table shows you a compilation of standards related to vibration measurement. This information is of great value to the vibration engineer, since it facilitates the diagnosis of likely reasons for abnormal vibration behaviour. Con- ventional vibration-monitoring equipment measures the magnitude of the overall complex signal and does not differentiate between the individual frequency components. Changes in individual frequency components, which may be significant, are not necessarily reflected to the same degree in the broad-band vibration and, hence, the criterion based on changes of broad-band vibration magnitude only may require supplementary phase measurements. Selection of suitable techniques for specific appli- cations require specialist knowledge of both the technique and the machinery to which it is to be ap- plied.
Worldwide Standards We can source any standard isi anywhere in the world. Your Alert Profile lists the documents that will be monitored. Zone B: Machines with vibration within this zone are normally considered acceptable for unrestricted long- term operation. Different operational limits, reflecting differences in dynamic loading and support stiffness, may be speci- fied for different measurement positions and di- rections. I Frequency range The measurement of vibration shall be broad band, so that the frequency spectrum of the machine is ad- equately covered. All of these phenomena need to be well understood, otherwise no objective bearing evaluation method can apply. Groups 3 and 4 of Part 3, which dealt with pumps, have been removed.