Riassunto analitico
Planetary gear systems are used in power transmission systems because of their features such as high torque capacity , large speed reductions, reliability and efficiency. Examples of application of planetary gears are automatic automotive transmissions.
Static analysis of planetary gears is essential in their design process. The main criteria to look at is the transmission error and mesh stiffness which assess the precision and integrity of the system. Furthermore, static analysis is a prerequisite for the dynamic analysis of the gearset which is used later for several purposes. For example: noise reduction, vibration analysis and diagnosis.
Transmission error is the variation of the deflection in the contact path between the two gears, under load. In simple terms, it is the difference between the actual position of the driven gear and the position it would have if the two gears were perfectly rigid. Mesh stiffness between two meshing gears is dependent on torque load, point of contact force application and contact ratio ( number of teeth sharing load at a given position ) and thus, mesh stiffness is periodic and varies according to the relative positions of the two gears.
Static analysis of a planetary gearset with defined geometrical and load parameters was performed, several models with different configurations were created using Kisssoft and romax softwares and the output was compared to that of Helical pair which is an in-house developed analysis tool in the vibration lab at UNIMORE.
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Abstract
Planetary gear systems are used in power transmission systems because of their features such as high torque capacity , large speed reductions, reliability and efficiency. Examples of application of planetary gears are automatic automotive transmissions.
Static analysis of planetary gears is essential in their design process. The main criteria to look at is the transmission error and mesh stiffness which assess the precision and integrity of the system. Furthermore, static analysis is a prerequisite for the dynamic analysis of the gearset which is used later for several purposes. For example: noise reduction, vibration analysis and diagnosis.
Transmission error is the variation of the deflection in the contact path between the two gears, under load. In simple terms, it is the difference between the actual position of the driven gear and the position it would have if the two gears were perfectly rigid. Mesh stiffness between two meshing gears is dependent on torque load, point of contact force application and contact ratio ( number of teeth sharing load at a given position ) and thus, mesh stiffness is periodic and varies according to the relative positions of the two gears.
Static analysis of a planetary gearset with defined geometrical and load parameters was performed, several models with different configurations were created using Kisssoft and romax softwares and the output was compared to that of Helical pair which is an in-house developed analysis tool in the vibration lab at UNIMORE.
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