User`s guide

51
Acceleration
(g)
Acceleration



Velocity
(m/s)
Amplitude
(m)
Peak
6.6
64.7
1.84
0.052
Peak-To-Peak
13.2
129.4
3.67
0.104
RMS
4.7
45.8
1.30
0.036
Table 5 Maximum Acceleration, Velocity and Displacement
Measure and Express Damping Characteristics
Using logarithmic decrement method, the damping ratio for the beam is determined from
measured data, as shown in Table 7.
Logarithmic Decrement
Damping Ratio
0.042
0.0067
Table 6 Damping Ratio
Predict Elastic Modulus.
The derived elastic modulus from the measurements and analytical prediction is listed
below. Predicted elastic modulus of the cantilever beam is 68GPa, the errors are close to
theoretical value.
Theoretical
Elastic Modulus (GPa)
Measured
Elastic Modulus (GPa)
Error
Beam 1
68.9
68.2
1%
Table 7 Comparison of Theoretical Elastic Modulus and Measured Elastic Modulus