340-0532/01 – Technical Diagnostics IV (TD4)
| Gurantor department | Department of Machine and Industrial Design | Credits | 4 |
| Subject guarantor | prof. Ing. Jiří Tůma, CSc. | Subject version guarantor | prof. Ing. Jiří Tůma, CSc. |
| Study level | undergraduate or graduate | Requirement | Choice-compulsory |
| Year | 1 | Semester | summer |
| | Study language | Czech |
| Year of introduction | 1999/2000 | Year of cancellation | 2006/2007 |
| Intended for the faculties | FS | Intended for study types | Follow-up Master |
Subject aims expressed by acquired skills and competences
The main objective of the lecture on the technical diagnostics IV is to give students knowledge of basic properties transducers, sensors for noise and vibration diagnostics, as well as become familiar with the technique of noise, vibration and rotational speed measurements, the spectral analysis in the diagnosis of sliding and roller bearings, gear units and combustion engines. Another objective is to describe the basics of balancing rotors, evaluation of operational deflection shapes and modal analysis of machine components and structures. Understanding the methods used to analyze the diagnostic measurements in industrial applications. The aim is to reach independent decisions about the result of measurements and to assess the state machinery.
Teaching methods
Lectures
Individual consultations
Tutorials
Experimental work in labs
Project work
Summary
Students get knowledge, which is now routinely expect from mechanical engineers in testing labs, in design (engineering) offices, in the department for inspection and in quality control or diagnostics for maintenance. Students will learn how to perform frequency analysis and signal other procedures that are commonly used in the diagnosis of mechanical equipment via measurement speed, vibration and noise. Students will be familiar with the signatures of common defects in bearings, in gear units and in motors. The lectures are focused as well on measuring operational deflection shapes and modal analysis. Introduction course is a response to the penetration of electrical engineering in machines and requirements of market for engineering products in the countries of the European Communities.
Compulsory literature:
Recommended literature:
Tůma, J.: Zpracovaní signálů získaných z mechanických systémů, Sdělovací
technika Praha, 1997.
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
Other requirements for students have not been established.
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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