Briefly describe the use of vibration measurement

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Reference no: EM132252991 , Length: 10 pages

Vibration Analysis

(a) Briefly describe the use of vibration measurement as a tool in condition monitoring of rotating machinery. Your answer should include:

• definitions of the quantities which can be usefully measured.
• the application to fault identification in rotating machinery.
• the typical transducer used for the task.

(b) A machine runs on rolling element bearings at a shaft speed of 3200 rpm. The bearings have the following characteristics: roller/race diameter ratio = 0.23, number of rolling elements 11, contact angle 0°. The machine is classified as Class II for the purpose of assessment under ISO 2372.

• Assuming that the vibration can be described by a dominant frequency component of the form x(t) = A sin(2Πft) calculate the vibration frequencies which would correspond to shaft and bearing faults occurring in this machine.

• Using the ISO 2372 table, estimate the range of acceleration amplitudes which should be measureable in order to record the bearing's performance up to the ‘unacceptable' threshold.

• If an accelerometer of sensitivity 100 mV/g is used to detect the vibrationestimate the maximum voltage amplitude which should be measureable.

(c) It is necessary to select an A/D converter to capture the vibration signals from the accelerometer. Using the results from part (b) above to estimate the required frequency range and frequency resolution of the measurement as well as the dynamic range of the data: specify

• A suitable resolution for the A/D converter,
• A suitable sampling frequency for the measurement,
• The number of samples that should be recorded for each spectrum
• Any other signal conditioning elements that may be necessary.

Reference no: EM132252991

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len2252991

3/11/2019 12:33:25 AM

Mitigating Circumstances: Circumstances beyond your control which you consider to have affected your performance are dealt with under the University’s Mitigating Circumstances Procedures. Unfair Means: This is an individual assignment. While you may be asked to perform practical tasks in pairs or small groups, and while you are encouraged to discuss the work with your peers as well as the academic staff, the report submitted under your own name must be your own individual work. Suspected academic misconduct, such as plagiarism, cheating and collusion, will be dealt with in conformity with the University’s Code of Student Conduct

len2252991

3/11/2019 12:33:12 AM

Length:The report should not exceed 10 A4 pages in length, inclusive of cover pages. Submission: Late submissions, non-submissions and applications for deadline extensions will be dealt with in conformity with the Assessment Regulations for Taught Postgraduate Programmes. The final report should be uploaded in PDF format via the link in the GCUlearn assessment page proper to this module.

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