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This difference can be explained by the accelerometers positions and the modal shape of the structure.
The modal shape of the bogie vibrating at 22.5 Hz is shown in Fig. 16.
The fundamental modal shape of the strips with natural frequency at 447 Hz is also shown.
The magnitude of any normalized modal shape of the simply supported beam is irrespective of the modal frequency or the wavelength, whereas the maximum generalized force in every mode may be different owing to the difference of the wavelength.
It was found to be a function of the elastic fundamental period and modal shape of the frame and consequently named the modal-elastic stability coefficient (θme).
Numerical investigation of the piezoelectric motor based on finite elements method was performed in order to obtain natural frequency and modal shape of the stator, to investigate dynamic characteristics and to validate operation principle of the motor.
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To demonstrate the influence of wavelength of modal shape on the generalized force, a numerical example is used herein.
c Third-order modal shapes of catenary.
a First-order modal shapes of catenary.
e Fifth-order modal shapes of catenary.
d Forth-order modal shapes of catenary.
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