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Gear Dynamics Analysis
Transmission errors and backlash are the main causes of noise and vibration problems in a gearbox.
- Transmission error: mainly the cause of whine noise
- Backlash: mainly the cause of rattle noise
Transmission error refers to the difference in angular velocity between the ideal state assuming that there is no error and shaft deformation in the rotating gear and the actual product with errors.
Transmission errors are significant data in predicting gear noises. When measuring the noise of a gear, it is possible to directly record the sound, but it is also possible to measure the noise by analyzing the difference in speed between the drive shaft and the driven shaft of the gear.
There are many causes of transmission errors, from changes in the rigidity of the gear system to assembly errors, backlash, and changes in gear contact ratio. In other words, to properly calculate the transmission errors, it is necessary to consider a number of variables. In particular, it is difficult to solve problems related to the gear dynamics simulation considering dynamic transmission errors in gear simulation.
Advantages of Gearbox Simulation Using Dynamics Simulation
A gearbox simulation using dynamics simulation has the following advantages:
- Since the result is a response to time, it can be directly compared with the values obtained from experiments and measurements, making it easy for users to understand.
- It is convenient since the conditions used in the test can be used as it is, such as changing the rotation speed of the gear in the test.
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Shaft deformation and gear position due to changes in load and speed are automatically reflected in the calculation. (There is no need to apply axis deformation or gear position to the modeling individually)
- After simulating a gearbox, if you plan to extend the simulation to other parts and systems connected to the gearbox, this is only possible with dynamics simulation. The influence of the extended parts are automatically reflected in the gear transmission error calculation without any additional settings.
- As a basic feature of dynamic simulation, rigid and flexible bodies can be used together, allowing you to change the simulation model according to your needs. (for example, it can be simulated by converting a gear into a flexible body to take into account the deformation of the gear web)
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Simulation considering the behavior of lubricants is possible by using Co-Simulation with CFD software. At this time, the dynamic simulation model created in advance can be used as it is for fluid analysis. This makes it easy to perform fluid analysis under the various speed and load conditions.
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