The springs do not have stiffness solely in the vertical direction. Rigid body modes are always close to zero if there is no stiffness. By including stiffness in the vertical direction, rigid body modes in the vertical direction increased from zero to around 4 Hz. If I include spring stiffness...
I don't have experience with frequency response analysis. What will it show me? The amplification factors that I can multiply the quasi-static stress results by to estimate the dynamic/resonant stresses?
The material being vibrated varies. Sometimes it's a pile of rocks, where the big rocks keep...
@NRP99 This is indeed a shaker and vibrations are indeed intended. The goal is indeed to have the device operate for a set number of years without failing.
My process is to extract the peak stresses per cycle and then calculate the expected life based on the number of cycles that the material...
The machine is not rotating. It is vibrating up and down at an angle. See the image below.
I used CBUSH elements to represent the springs. The CBUSH elements have a spring constant in their longitudinal direction only (so only a spring constant is present only in the vertical direction).
Since...
Hello,
I am analyzing a material screening machine. It consists of a structure that is supported by springs. The assembly includes two motors with unbalanced masses that produce an excitation force which causes the structure to vibrate.
The motors operate at 1200 RPM (20 Hz).
As the structure...
