measurement chains and sensors. Concept of measurement. Errors, classification and propagation in the measurement chains, data processing, mean and variance.
Digital sampling. Power spectra. Autocorrelation of signals. Analog and digital filters. Basic measures and concepts of performance verification and testing.
"Theory and design for mechanical measurements”, R.S. Figliola, D.E. Beasley, John Wiley & Sons, 1991
“Fundamentals of temperature, pressure and flow measurements”, R.P. Benedict, A Wiley-Interscience Publication John Wiley & Sons, 1984
“Fluid Mechanics Measurements”, R.J. Goldstein, Hemisphere publishing corporation, 1983
“Strumenti e metodi di misura”, E. O. Doeblin, Mc GRAW-HILL INTERNATIONAL EDITIONS
“Measurment System - Application and design”, E. O. Doeblin, Mc GRAW-HILL INTERNATIONAL EDITIONS
Dally, “Experimental stress analysis”, College House Enterprises, 2005.
Bray, Vicentini “Meccanica Sperimentale”, Levrotto e Bella, 1975
Ajovalasit “Analisi sperimentale delle tensioni con gli estensimetri elettrici a resistenza”, Aracne, 2008.
Cigada, Comolli, Manzoni “Estensimetria Elettrica”, Città Studi Edizioni, 2006.
Azzoni “Strumenti e misure per l’ingegneria meccanica”, Hoepli, 2006.
Learning Objectives
The aim of the course is to provide the knowledge and skills in the field of experimentation, measurement and testing on machines, structures and products and industrial processes. In particular, the course aims to provide knowledge on:
- meaning of measurement, experimentation and testing. Static and dynamic measurements;
- sensors, main physical principles used and measuring chains for different types of measurement;
- data analysis and processing, taking into account measurement errors and uncertainties;
Through examples and case studies, the course also aims to increase the ability to apply the knowledge listed above, in particular:
-to identify the most suitable methods for carrying out experimentation or control on a product / structure / machinery and to assess / verify / test its characteristics.
-to understand how performance can be verified and systems can be improved, , innovating the systems also through the development and improvement of measurement and control methods, in the field of mechanical engineering.
A further objective is to achieve an adequate preparation to achieve an adequate preparation to access the third level of university studies (attendance at second level master and doctoral schools), in order to further deepen knowledge and skills in the field of research.
Prerequisites
solid foundations of physics, mathematics analysis, technical physics and machine design.
Teaching Methods
The course is primarily addressed through lectures with some lab experience to better understand the use of advanced tools.
Further information
the experimental approach, even if tiring, allows to familiarize with sensors and acquisition and control systems, finalizing the theoretical concepts.
Type of Assessment
On a voluntary basis, a measurement experience in the laboratory with the related report can be done, to be carried out normally in groups.
In this case the report will be discussed during a final oral examination, which is divided into the following parts:
1) presentation and discussion of the eventual report (ten-fifteen minutes)
2) standard oral exam (25-30 minutes ) with two "" theoretical "questions taken from the program, or an application question, on the testing of a system or a system component.
The total duration of the oral exam is about 30-40 minutes
Course program
basic concepts on measurement and measurement systems.
Measurement systems and main components, connections and measuring chain.
Characteristics of the instruments. Constant and variable signals over time. Errors; errors
definition, identification and propagation in the measurement chain .
Temperature measurements; seebek effect and thermocouples, thermocouple laws, thermoresistance and thermistors.