GeDy TrAss Software
The powertrain design in one software
We commercialize GeDy TrAss, our semi-analytical software for specific analysis on geared mechanical systems, the software is based on two main tools:
GearDraft
Starting from few design parameters it defines the best transmission layout and it generates automatically the CAD / FEM model.
Layout definition and CAD / FEM generation
OptiMicro
Working on the gears microgeometry it performs NVH optimization and virtual validation in static and dynamic behavior.
NVH optimization and virtual validation
Fast
Dynamic analysis from months to hours
Reliable
Accuracy comparable to FEM software
Smart
Automatic algorithm to avoid inefficiency
GearDraft
GearDraft is based on an algorithm that automatically generates a whole mechanical transmission by inserting a few input data in a short time. The algorithm chooses the components (bearings, shafts, synchronizers, gears), their dimensions and their positions to satisfy the user initial requirements. GearDraft is useful during the blank-sheet pre-design phase, when a new transmission has to be thought from the beginning, or even when a different layout of the components is needed.
The power of the tool is to leave to the user complete freedom on the choice of the algorithm constraints, for instance the overall dimensions of the gearbox and the transmission ratio. Afterwards, the output can be converted into a CAD/FEM interfaceable with other commercial softwares. GearDraft’s aim is to make the user save time, cutting down the preliminary design operations often made “by hand”, and reinvest it for further detailed analyses.
GeDy TrAss Software Interface.
Layout of a 5-speed gearbox automatically generated by GearDraft.
Contact analysis between different types of gears performed by OptiMicro: standard helical and spur gears on the left, crowned helical and spur on the right.
Spectogram of the dynamic displacement in gears obtained with OptiMicro.
OptiMicro
OptiMicro is fundamental when an optimization of the gears is needed; through a patented algorithm, it provides the quasi-static and dynamic behaviour of the system still ensuring high accuracy in comparison with other FEM results. For the quasi-static analyses, the algorithm is based on the load sharing analysis between the coupled teeth of the gears, that calculates the real distribution of pressure acting on the bodies in contact, the real contact ratio under load, the gears deformation and the static transmission error. Compared with FEM software, the computational time is drastically reduced up to 80%. For the dynamic analyses, OptiMicro can rely on a simple 1D model and a powerful 3D model. The first one provides important information about the nonlinear dynamic transmission error and the dynamic overload of the system layout in a few minutes.
The 3D model enables dynamics analysis for flexible bodies in a few hours, whereas other dedicated commercial softwares require months of calculations, a computational time prohibitive for any company nowadays. The innovative nonlinear time domain approach allows to quickly and accurately determine the response amplitudes of the mode shapes excited by the time-varying mesh stiffness under variable loads and speed, an invaluable input for fatigue and NVH analyses. Furthermore, thanks to the multi-objective optimization OptiMicro could be used for the design of gears made through Additive Manufacturing: indeed, it provides the best tooth profile and root fillet in terms of NVH and stress distribution for a specific application.