Measurements on the gearbox / transmission

Problem: Transmission error (TE), gearbox rattle, gear whine noise or car body roar

Goal: Reliable transmission design

Among other things, driving comfort is impaired by noises such as gearbox rattle, gear whine noise or car body roar. They are caused by torsional vibrations in the gearing of the transmission. When the teeth of two gears roll off, a slight torsional angle or transmission error (TE) occurs, resulting in a torque fluctuation. This high-frequency fluctuation is the main cause of gear noise.

In the transmission speed analysis shown as an example, the speeds at the input and output shafts of the gearbox/transmission are recorded by means of angular step encoders. At the same time, structure-borne sound signals are recorded with an accelerometer. These data are then used as the basis for evaluating the transmission error in the order domain. Here, the evaluation is performed on a common time or angle basis.

The measurement of the transmission characteristics of a gearbox can be performed on the test bench with an electric prime mover.

The recorded measured values are evaluated in the time and spectral domain. The acoustic behaviour is also analyzed.

Furthermore ROTEC ENGINEERING provides you with support and technical engineering know-how for problems related to vibration analysis of engines, transmissions and drive trains. With our know-how, we make a valuable contribution to your product in the areas of timing gear validation, valve train optimization, clutch design, transmission errors (TE), transmission optimization, oil supply optimization, powertrain measurement and optimization, current and voltage analysis, and the application of measurement technology.

 

Time Domain
Analyses

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  • Dynamic torsion angles in gearbox components
  • Analysis of the wave analysis
  • Impact loads during change
  • Analysis of the stiffnesses in the drive

Spectral Domain
Analyses

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  • Analysis of dynamic excitations
  • Verification of vibration dampers and coupling systems
  • Resonance behavior of the overall system
  • Change of natural frequencies over ambient condition
  • Dynamic peak loads

Analyses of the
acoustic behavior

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  • Identification of noise sources
  • Detection of component resonances
  • Specialized software solution for gearbox testing

Associated
Products

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WHERE CAN TORSIONAL VIBRATIONS
BECOME CRITICAL IN THE E-POWERTRAIN?

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