FREQUENCY ANALYSIS ON A ROTATING SHAFT

AIM:

To perform frequency analysis on a rotating shaft using solid works. We need to find the critical frequencies acting on the rotating shaft.

OBJECTIVE:

1) Natural frequency analysis is conducted on a rotating shaft to understand the dynamic behaviour of the system.

2) It helps us to reduce vibrations on the component.

3) Virations occuring on the system are caused due to Dynamic loading on the component.

MODELING AND SIMULATION:

1) Firstly we have to sketch the rotating shaft on solidworks. Using commands like Extrude, circle we are able to create the required model.

2) Using the circle command, we are sketching a circle of Diameter 150mm. we are Extruding to a distance 5mm.

3) We are then sketching 2 circles on one side of the extruded circle. The two circles are of diameter 26mm and 16mm.

4) On doing so, we get one part of the model.

5) Using the mirror command, we are able to eplicate the same face on ther other side of the circle creating a complete model.

6) Images of construcution are shown below

                                                                                        SKETCHING A CIRCLE OF DIAMETER 150mm

                                                                                    SKETCHING ONE END OF THE MODEL WITH SHAFT 

                                                                         EXTRUDING ONE END OF THE MODEL AND CREATING SHAFT 

                                                 USING MIRROR COMMAND TO REPLICATE THE SAME TO GET FINAL MODEL OF ROTATING SHAFT

SIMULATION:

1) In this project, we are conducting Frequency analysis on the rotating shaft to find the frequencies at which the shaft is showing dynamic behaviour.

2) To start the simulation, we are creating a new study by selecting Frequency analysis.

3) We have to provide necessary fixtures to the model.

4) Using the frequency analysis command we can check the number of frequencies its assigned and we can also change the it using the properties menu.

5) The solver we are using is FFEPLUS, since it assumes a particular solution and solves with that solution to gives us results.

6) We are running the simulation for 5 nodes to give us  required results.

7) The results of the simulation are shown below.

                                                                APPLYING FIXTURES TO BOTH ENDS OF THE ROTATING SHAFT

                      APPLYING A FINE MESH TO THE MODEL FOR PERFORMING FREQUENCY ANALYSIS ON EACH SECTION OF THE MODEL

USING 5 NUMBER OF FREQUENCIES TO CONDUCT THE FREQUENCY ANALYSIS

                                                                                       RESULT 1: RESULTANT AMPLITUDE OF MODE 1

                                                                              RESULT 2: RESULTANT AMPLITUDE OF MODE 2

                                                                               RESULT 3: RESULTANT AMPLITUDE OF MODE 3

                                                                                  RESULT 4: RESULTANT AMPLITUDE OF MODE 4

                                                                                RESULT 5: RESULTANT AMPLITUDE OF MODE 5

RESONANT FREQUENCIES OBTAINED ON PERFORMING ANALYSIS.

 ANIMATION OF THE MODEL:

https://youtu.be/oBvZ2gRbGes