352-0529/01 – Diagnostics (D)
| Gurantor department | Department of Control Systems and Instrumentation | Credits | 4 |
| Subject guarantor | doc. Ing. Jaromír Škuta, Ph.D. | Subject version guarantor | prof. Ing. Jiří Tůma, CSc. |
| Study level | undergraduate or graduate | Requirement | Choice-compulsory |
| Year | 2 | Semester | winter |
| | Study language | Czech |
| Year of introduction | 2004/2005 | Year of cancellation | 2009/2010 |
| Intended for the faculties | FS | Intended for study types | Master |
Subject aims expressed by acquired skills and competences
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.
Teaching methods
Lectures
Tutorials
Experimental work in labs
Project work
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.
Compulsory literature:
Recommended literature:
Tůma, J.: Vehicle gearbox noise and vibration. Wiley 2014.
BROCH, J.T. Mechanical vibration and shock measurements. Brüel & Kjaer , 1984.
Way of continuous check of knowledge in the course of semester
E-learning
Other requirements
Prerequisities
Subject has no prerequisities.
Co-requisities
Subject has no co-requisities.
Subject syllabus:
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.
Conditions for subject completion
Occurrence in study plans
Occurrence in special blocks
Assessment of instruction
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