Frequency Analysis of a rotating shaft
AIM:
- To find out the critical or resonant frequencies of a rotating shaft in Solidworks.
- Design the model using solidworks based on any desired dimensions.
INTRODUCTION:
Resonant frequency is the oscillation of a system at its natural or unforced resonance. Resonance occurs when a system is able to store and easily transfer energy between different storage modes, such as Kinetic energy or Potential energy as you would find with a simple pendulum.
Resonance - "The increase in amplitude of oscillation of an electric or mechanical system exposed to a periodic force whose frequency is equal or very close to the natural undamped frequency of the system."
Mode:-
The mode is a statistical term that refers to the most frequently occurring number found in a set of numbers. The mode is found by collecting and organizing data in order to count the frequency of each result. The result with the highest count of occurrences is the mode of the set, also referred to as the modal value.
Mode Shapes The deformed shape of the structure at a specific natural frequency of vibration is termed its normal mode of vibration. Some other terms used to describe the normal mode are mode shape, characteristic shape, and fundamental shape. Each mode shape is associated with a specific natural frequency.
Modes are inherent properties of a structure, and are determined by the material properties (mass, damping, and stiffness), and boundary conditions of the structure. Each mode is defined by a natural (modal or resonant) frequency, modal damping, and a mode shape (i.e. the so-called “modal parameters”).
PROCEDURE:
1. Creating the rotating shaft.
2. Clicking on the new simulation select the frequency simulation.
3. Apply the default material Alloy Steel.
4. Apply bearing fixture on the stepped face of the rod at the two ends.
5. Generate the default mesh.
6. Now clock on mesh and run option.
Results:
1. Roller-Frequency 1-Amplitude-Amplitude1
2. Roller-Frequency 1-Amplitude-Amplitude2
3. Roller-Frequency 1-Amplitude-Amplitude3
4. Roller-Frequency 1-Amplitude-Amplitude4
5. Roller-Frequency 1-Amplitude-Amplitude5
Resonant frequencies: