- Docente: Raffaella Di Sante
- Credits: 6
- SSD: ING-IND/12
- Language: Italian
- Teaching Mode: Traditional lectures
- Campus: Forli
-
Corso:
First cycle degree programme (L) in
Mechanical Engineering (cod. 0949)
Also valid for First cycle degree programme (L) in Mechanical Engineering (cod. 0949)
Learning outcomes
The main objectives of the course are to introduce and discussthe main issuesrelated to measurements on mechanical and thermal systems, to the acquisition, analysis, processingandinterpretation ofmeasurement results, and to the understanding and selection of sensors most widely used for physical quantities measurements.
Course contents
Basic principles
Measurement concept: definitions and standardisation. General measurement systems configurations. Examples of application to different application areas.
Static characteristics of measuring instruments
Static calibration and calibration curve. Statistical data analysis. Metrological characteristics: accuracy, sensitivity, treshold, resolution, hysteresis, linearity. Uncertainty: definitionsand standardisation, analysisand determination.
Dynamic characteristicsof measuring instruments
Introductionand general equation. I and II order instruments andresponse to typical inputs. Response to periodic and transient inputs. Experimental measurement od dynamic parameters.
Basics of signal analysis
Periodic, transient and random signals. Auto- e cross-correlation functions. Power spectral density. Frequency responseto general inputs.
Analog-to-digital conversion
Quantisationand coding. Analog signal acquisition and conditiong. A/D converters. Sequential and simultaneous multi-channel acquisition configurations.
Dimension, displacement and velocity measurements
Callipers, potentiometres, LVDTs, capacitive, optical and magnetic proximity sensors. Incremental and absolute encoders.
Absolute displacement, velocity and acceleration measurements
Sismometers. Accelerometers and piezoelectric accelerometers. Accelerometer calibration.
Deformation measurements
Strain gages. Resistance strain gages: types, applications, manufacturing andfixing of sheet strain gages, Wheatstone bridge, temperature effect, strain measurement configurations.
Force, torque and power measurements
Scales and piezolelectric and strain gage load cells. Torquemeters. Mechanical, hydraulic and magneticbrakes.
Pressure measurements
Manometers, piezoelectric, piezoresistive and capacitivepressure sensors. Dynamic calibration of pressure sensors.
Flow velocity measurements
Pitot tube. Hot-wire anemometer. Laser Doppler Anemometry (LDA). Particle Image velocimetry (PIV).
Temperature measurements
Thermometers e thermocouples. Thermoresistances e thermistors. Infrared methods: pirometers e thermocameras.
Readings/Bibliography
E.O. Doebelin, Strumenti e Metodi di misura , McGraw Hill
R. Figliola, D. Beasley, Theory and design for Mechanical Measurements, Wiley&Sons
G. Minelli, Misure meccaniche , Patron
Teaching methods
Teaching is divided into lectures.
Assessment methods
Oral colloquium.
Teaching tools
Video Projector, pc
Office hours
See the website of Raffaella Di Sante