Vishay 2310 Betriebsanweisung PDF herunterladen (Seite 15)

Finite Element simulation (Kargar, S; Bardot, D.M. ., 2010) to simplified method of drawing a

smooth curve to connect the data points on a plot with distance from the hole against the local

strain

(Stress and Strain Concentration, 2003).

When a set of strain gauges are installed at different positions on the longitudinal axis of

a cantilever beam, and a known bending load applied at the free end of the beam, a series of

beam characteristics can be determined, and the system can be calibrated to measure unknown

loads. A stress analysis laboratory taught at Middle East Technical University with such design

determines the beam’s flexural rigidity, height, location of the beam and location of the applied

load, and enables the system to measure loads. (Middle East Technical University)

The current laboratory derives natural frequency of the beam by analyzing the vibration

data during free vibration. Another alternative method to determine natural frequency is to find

the resonance profile of the beam, or the amplitude response at each frequency under forced

vibration of constant amplitude input. This method is taught in certain curriculums, for example,

in the Aerospace laboratory course at University of Toronto. (Emami)

2.2.2.3 Equipment

While some improvements can be implemented without major change in the equipment

list, the existing resources do not support measurement of strain in multiple axes. The employed

signal conditioning unit, Vishay 2310 Signal Conditioning Amplifier System, is single-channeled

and relatively costly to acquire. An economical yet effective alternative signal conditioner should

be acquired to enable this upgrade, which will be discussed in section 3.1 and section 4.1 of this

report.

2.2.2.4 Laboratory Instructive Materials

The instructive materials should guide the students to prepare for the laboratory, conduct

the experiment and complete the lab report. Background knowledge of the key elements should

be provided to ensure sufficient appreciation of the topics; the experiment steps should be

described in details; and the discussion questions should help reinforce the knowledge and skills

acquired.

To help students further appreciate the Wheatstone bridge set-up with strain gauges, the

lab assignment should include calculations of current draw and power consumption of the circuit.

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Vishay 2310 Betriebsanweisung Seite 15