ISO MECHANICAL VIBRATION – EVALUATION OF MACHINE VIBRATION BY MEASUREMENTS ON ROTATING SHAFTS – PART 3: COUPLED . Mechanical vibration – Evaluation of machine vibration by measurements on rotating shafts – Part 3: Coupled industrial machines (ISO. Full text of “IS/ISO Mechanical vibration – evaluation of machine vibration by measurements on rotating shafts, Part 3: Coupled Industrial Machines”.
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The main task of technical committees is to prepare International Standards. Users of Indian Standards should ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of ‘BIS Catalogue’ and ‘Standards: Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Customer Services.
The criteria are presented for the specified steady-state operating conditions at the rated speed and load ranges. In industrial machines, shaft vibration relative to the bearing is normally measured. If only isi measuring direction is used, care should be taken to ensure that it provides adequate information see ISO Where there is no established baseline for example, with a new isso the initial ALARM setting should be based either on experience with other similar machines or relative to agreed acceptance values.
Generally, the machine may be operated for a limited period in this condition until a suitable opportunity arises for remedial action.
This does not preclude the free use, in course of imple- menting the standard, of necessary details, such as symbols and sizes, type or grade designations. The values chosen will normally be set relative to a baseline value determined from experience for the measurement position or direction for that particular machine. Attention is particularly drawn to the following: To provide a warning that a defined value of vibration has been reached or a significant change has occurred, at which remedial action may be necessary.
Details and advice can be obtained from the Copyright and Licensing Manager. After a period of time, the steady-state baseline value will be established and the ALARM setting should be adjusted accordingly. Actually as I look online at the title ofit is for industrial machines, and since you are doing a 55mW you probably should be using Standards are also reviewed periodically; a standard along with amendments is reaffirmed when such review indicates that no changes are needed; if the review indicates that changes are needed, it is taken up for revision.
Quoting “The values given in Tables A. However, for those machines for which continuous monitoring of vibration is employed, it is common practice to establish operational vibration limits.
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Adobe is a trademark of Adobe Systems Incorporated. I cannot see graphs. Sometimes getting the OEM recommendation may involve making a phone call or an email. These guidelines are presented in terms of both steady running vibration and any amplitude changes which can occur in these steady values.
These values are not intended to serve as acceptance specifications, which shall be subject to agreement between the machine manufacturer and the customer. Machine behavior can be very much dependent on construction details, hence why I suggest you research the OEM guidelines.
In downloading this file, parties accept therein the respons bility of not infringing Adobe’s licensing policy. The numerical values specified are not intended to serve as the only basis for vibration evaluation since, in general, the vibratory condition of a machine is assessed by consideration of both the shaft 791-93 and the associated structural vibration.
Different operational limits, reflecting differences in dynamic loading and support stiffness, may be specified for different measurement positions and directions. Is values used will, therefore, generally be the same for all machines of similar design and would not normally be related to the steady-state baseline value used for setting ALARMS. No part of these publications may be reproduced in any form without the prior permission in writing ido BIS.
ISO 7919-3 | AMP Maintenance Forums
Therefore, unless 791-93 otherwise, this part of ISO always refers ios relative vibration displacement. Such changes can be instantaneous or progressive with time and can indicate that damage has occurred or be a warning of an impending failure or some other irregularity. Change in vibration magnitude This criterion provides an assessment of a change in vibration magnitude from a previously established reference or baseline value for particular steady-state conditions.
The criteria are presented for the specified steady-state operating conditions at the rated speed and load ranges. The values used will, therefore, generally be the same for all machines of similar design and would not normally be related to the steady-state baseline value used for setting ALARMS.
Different manufacturers may also have ixo own guidelines for limits when passing through critical speeds.
For monitoring purposes the measuring system isp be capable of covering overall vibration up to a frequency equivalent to 2,5 times the maximum service speed. Therefore, although monitoring the change in broad-band vibration will give some indication of potential problems, it might be necessary in certain applications to use measuring and analysis equipment which is capable of determining the trends of the vector changes that occur in individual frequency components of the vibration signal.
They apply for normal slow changes in load but do not apply when different conditions exist or during transient changes, for example during start-up and shut-down and when passing through resonance ranges. Mechanical vibration – evaluation of machine vibration by measurements on rotating shafts, Part 3: In certain cases, there can be specific features associated with a particular machine, which would require different zone boundary values lower or higher to be used.
The reference value for this criterion is the typical, reproducible normal vibration, known from 719-3 measurements iwo the specific operating conditions.