Vishay 2310 Betriebsanweisung PDF herunterladen (Seite 13)

temperature and pressure vary, which unsettles the equilibrium of fluids and carbon dioxide in

the can. For these stated sources or variability, the students can gain more insights of the

experiment from a relatively large amount of measurements. Therefore, use of a “class data sheet”

to gather experiment results can be beneficial. In addition, due to the different carbonation

processes in the beverage products, beverage cans of one product should be provided to the

whole class to acquire more meaningful data.

Strain gauge rosettes, or a set of single strain gauges arranged in different directions, can

characterize the principle stresses of a surface. Strain measurements in multiple axes can provide

valuable learning experience to students. A student laboratory used at Middle East University

uses a three element rectangular rosette with an unknown angle α to the axis of a thin-wall vessel

to measure the internal pressure of the vessel.

(Middle East Technical University) The material’s

Poison’s ratio, the unknown angle α, the direction and magnitude of principle stresses, principle

strains are also determined as a part of the laboratory. More in-depth engineering calculations are

utilized in the mentioned laboratory, and the introduction of strain rosettes adds breadth to the

basic design of laboratory.

2.2.2.2 Design of Vibration Measurement Laboratory

Since the vibration measurement laboratory shares the same set up with the strain and

pressure measurement laboratory, investigation of the resolution and noise under different gains

and the A/D converter’s range settings can be conducted in this laboratory as well.

Calibration of the strain measurement system can be taught with the current setup of this

laboratory. A laboratory taught at Northern Illinois University requires students to determine the

strain gauges’ gage factors by applying known weights, which is directly leads to known strains.

(Mostic, 1990) A laboratory taught at University of Massachusetts Lowell teaches students to

determine the systems’ sensitivity by applying known deflection, so that the output voltage can

be associated with measured strain. (Mostic, 1990) The laboratory developed by Vernier

Software and Technology challenges the students to use the set-up as a penny-counter, which

will accurately count the number of pennies placed on the tip of the cantilever. (Mostic, 1990)

This laboratory teaches students to determine elastic modulus of the material by deriving

it through measured frequency, yet the determination of “effective length” for vibration of the

beam, which is a parameter in the calculation, is somewhat ambiguous in this laboratory. The

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Vishay 2310 Betriebsanweisung Seite 13