IND-02 ROMAX NVH CAPABILITIES & APPLICATIONS(INDUSTRIAL SESSION)

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Romax capabilities in NVH extend from the development of advanced software tools that provide an all in one solution for the modelling, simulation and analysis of geared transmission systems. Romax can be involved at the concept design or development stages as well as during refinement or problem solving on existing applications. The Romax approach is to simulate the whole system including bearing, gears, housings and shafts in order to take into account the many different influences within the analysis. Both static and dynamic analysis can be carried out including calculation of system displacements with gear/bearing misalignments due to applied torque load and modal analysis to determine system mode shapes and natural frequencies. Transmission error (TE) is the ultimate source of gear whine noise. Romax NVH capabilities allow calculation for static deflections of the system under a given loading condition. The resulting gear mesh misalignments are used, along with gear micro-geometry to predict the TE in each loaded gear mesh either for a single gear mesh or a complete planetary gear set. The vibration response of the entire system to the TE excitation is obtained from an automatically generated dynamic model. The relative phase of the TE excitations can be critical and so is included in all analysis. In any gearbox, it is impossible to avoid variations in mesh misalignment, since the gearbox experiences different speeds and different torques. However, it is possible to modify the gear geometry to minimise the transmission error over its range of operating conditions. Gear macro-geometry can be modified to maximise the contact ratio in gears, thereby improving the noise characteristics of the gear. However, micro-geometry modifications are also necessary since the gear undergoes elastic deflection and must be able to accommodate variations in mesh misalignment. Romax have a great deal of experience to define optimised gear geometry with an evolutionary optimisation process to quickly and easily analyse gear mesh micro-geometry and predict the transmission error as well as gear contact patterns and loads. After using the optimiser to determine the ideal micro-geometry design, it can also be used to investigate the sensitivity of the design to manufacturing errors and tolerances. Transmission designers are also increasingly turning to virtual simulation solutions to address the challenges of noise caused by gear meshes termed gear rattle. In many applications both gear whine and gear rattle noise problems occur simultaneously and often only become apparent when complete transmission prototypes are built and tested which often leads to product launch delays and considerable additional expense. Romax can consider gear whine and gear rattle analysis together in a single environment and on the same virtual model. Rattle problems can then be addressed in parallel with whine issues at an early development stage with consequent savings of time and resources. Concept designs can have their potential susceptibility to rattle behaviour quantified and remedied by Romax before any prototypes are made.
一般社団法人日本機械学会の論文
2009-05-13

IND-02 ROMAX NVH CAPABILITIES & APPLICATIONS(INDUSTRIAL SESSION)

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