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ECTS Course Overview



Diagnostics

* Exchange students do not have to consider this information when selecting suitable courses for an exchange stay.

Course Unit Code352-0529/02
Number of ECTS Credits Allocated5 ECTS credits
Type of Course Unit *Choice-compulsory
Level of Course Unit *Second Cycle
Year of Study *
Semester when the Course Unit is deliveredWinter Semester
Mode of DeliveryFace-to-face
Language of InstructionCzech, English
Prerequisites and Co-Requisites Course succeeds to compulsory courses of previous semester
Name of Lecturer(s)Personal IDName
TUM52prof. Ing. Jiří Tůma, CSc.
Summary
Sensors for noise and vibration in diagnostics, accelerometers, microphones, inclinometers, photoelectric tachometer probes, incremental rotary encoders, proximity probes, laser torsional vibration meter, scanning laser, modal hammer, shaker, rotational machinery diagnostics and monitoring, rolling bearing journal bearing, rolling and journal bearing faults, orbits in rotor systems, full spectra, gearbox noise and vibration, transmission error measurements, angular vibration measurements, electric motor diagnostics.
Learning Outcomes of the Course Unit
The main objective of the lecture is to acquaint students with diagnosis of machines and mechanical engineering in theory and practice. The lectures start with measurements of the static and dynamic characteristics of transducers, the basic sensors for noise and vibration diagnostics, the technique of noise, vibration and rotational speed. The main attention is focused on the diagnosis of journal and rolling bearings, gear units and internal combustion engines. Another objective is to describe the fundamentals of balancing shafts, evaluation of operational deflection shapes and modal analysis of machine components and structures. The last area is the evaluation of endurance tests of machines and other equipments.
Course Contents
1. Vibration and acoustic diagnostics, special sensors, signal processing methods.
2. A/D converters (successive approximation, sigma-delta and flash). Antialiasing filters.
3. Speed sensor for diagnostics. Optical probes. Incremental angle sensors (encoders). Laser sensor torsional vibrometer.
4. Vibration transducers (sensors for speed and acceleration) and dynamic forces. Piezoelectric sensors. Laser vibration sensor. Calibration
5. Measuring microphones. Probe for measuring sound intensity. Frequency weighting A, B, C, decibels scale. Sound level meter. Calibration pistonphone.
6. Diagnosis of rolling bearings. Measurement in quality control of production and in operational diagnostics. Frequency of defects and the importance of using the envelope signal.
7. Diagnosis of rotor systems with sliding bearings. Proximity probes. Measurement of orbits, full spectrum of vibration excited by flow of lubricant (whirl and whip)
8. Diagnostics of gears. Calculation of toothmeshing frequency. Planetary gearboxes. Measurement noise, vibration and transmission error of a gear train.
9. Diagnosis of internal combustion engines, measuring uniformity of rotation.
10. Device for measuring frequency responses. Principle of a vibrator (shaker). Hammers for modal analysis.
11. Measurement of operational deflection shapes, and their use for diagnosis of mechanical structures.
12. Modal analysis of mechanical structures .
13. Evaluation of the Wohler curve (stress-number). , measurement and evaluation methods for loading spectra based on rain-flow. Application for the lifetime prediction.
Recommended or Required Reading
Required Reading:
CROCKER, M. (Editor) Handbook of noise and vibration control. New York: Wiley, 2007. ISBN 978-0-471-39599-7.
RANDALL, R.B. State of the art in monitoring rotating machinery, Preceedings of
ISMA 2002 – Volume IV, pp. 1457 – 1478.
TUMA, J. Diagnostika strojů. Skripta VŠB-TU Ostava, FS, 2009. ISBN 978-80-248-2116-0.
CROCKER, M. (Editor) Handbook of noise and vibration control. New York: Wiley, 2007. ISBN 978-0-471-39599-7.
RANDALL, R.B. State of the art in monitoring rotating machinery, Preceedings of
ISMA 2002 – Volume IV, pp. 1457 – 1478.
Recommended Reading:
Tůma, J.: Vehicle gearbox noise and vibration. Wiley 2014.
BROCH, J.T. Mechanical vibration and shock measurements. Brüel & Kjaer , 1984.
Tůma, J.: Zpracovaní signálů získaných z mechanických systémů, Sdělovací
technika Praha, 1997.
BROCH, J.T. Mechanical vibration and shock measurements. Brüel & Kjaer , 1984.
Planned learning activities and teaching methods
Lectures, Tutorials, Experimental work in labs, Project work
Assesment methods and criteria
Tasks are not Defined