The paper deals with the basic theory of gearing from vibration point of view. Properties such as slipping velocity, friction moments, lost friction power, stiffness and error functions, and inter teeth backlash are taken into consideration. Mathematical model for torsion vibration of a gearbox system is given. The model gives possibility of computer simulation and investigation of all factors which have influence to vibration generated by a gearing. The factors can be divided into four groups: design, technology, operation, and change of condition. Examples of the results of computer simulations which shows properties of the gearing and interpretation of results of gearbox system behaviour obtained are given. The results of computer simulation show that they can enhance the knowledge of a diagnostic expert and gives a new tool for supporting the diagnostic inference. Affects of different factors which have influence on vibration generated by a gearing are examined. The results are referred to real measurements obtained from laboratory rigs and from field practice. Properties of a new diagnostic measure are examined. High consistency of results of computer simulations to real measurements have been shown.
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