I want to apply harmonic load (i.e. vibrating of motor) in harmonic response analysis.
If you have a rotor of mass m and the center of mass is a distance e from the axis of rotation and the rotor is turning with an angular velocity Omega, the amplitude of the rotating force is F = m*e*Omega^2
Machines with high speed rotors are usually balanced to get e = 0 or something very close to zero.
Every force applied in a Harmonic analysis is the amplitude of a harmonic force.
How to calculate the value/Amplitude of the harmonic force ( i.e. in my case Vibration of the mounted motor) ?
Any suggestion regarding this please!
First my sincere appreciations to your contribution here at the forum.
I am pretty much new to simulations and have been lately working with harmonic analysis to simulate stress and deformation responses of a dewatering screen excited with a set of vibro motors. I am attaching a zip file containing the image of the screen and the forces applied, in a zip file.
We have performed the below steps.
I would like your comments on the below points
Your answers are highly valued and appreciated.
Adobe Portable Document Format (PDF)Ansys Screenshots.zipUploaded 12:30 pm360.3 KB
Any force applied in a Harmonic Response analysis is entered as an amplitude of a sinusoidal function that oscillates with the frequency specified in the analysis.
Here is how you create a force that rotates around a circle... use one remote force in the X direction with an amplitude F and phase angle 0 degrees applied to a remote point. Use a second remote force in the Y direction with an amplitude F and phase angle 90 degrees applied to the same remote point. Together, those two forces create a single force of amplitude F that rotates about the origin of the remote point, parallel to the X-Y plane, with a frequency specified in the analysis.
In the equations below, you can see a sinusoidal force in the x direction that oscillates with a circular frequency and zero phase, then another sinusoidal force in the y direction that has a pi/2 = 90 degree phase angle. When you plot the two forces in the X and Y axes, they describe a circle.
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