## Recursive Domain Normal Modes in Structural Dynamics

Intro Dynamic sub-structuring is a method used to analyze the dynamics of mechanical systems by partitioning the system into smaller subsystems/subcomponents. The problem is solved into these smaller subcomponents and then the global… Continue reading

## PressFit Force / Force Required for Assembly

Intro Press fit assembly is one of the traditional methods to secure two parts. Presses are used which combine the two parts together with large amounts of force. The presses are usually hydraulic,… Continue reading

## Prestressed Modal Analysis of a Rotor Assembly, E-Motor

Intro This is a short case on prestress effects for a modal analysis of a rotor. For simplification rotor assembly includes only rotor core and shaft. This example serves the purpose to demonstrate… Continue reading

## AN EXAMPLE OF LOOSE FIT EFFECT BETWEEN ROTOR AND SHAFT OF AN E-MOTOR

Interference fit method is commonly used on electrical machines for the assembly of rotor core and shaft. Proper selection of clearance values is of vital importance for the rotor dynamic stability. There are… Continue reading

## Interference Fit, Rotor Core and Shaft

Intereference fit, rotor core & shaft As it is already noted in previous posts, the rotor core is interference fitted to the shaft. This radial interference fit value is optimized in order to… Continue reading

## Simulation of Rotor Core and Shaft Assembly of e-Motor

Intro Below is an example of a rotor assembly that is going to be used for the analysis.     On the following picture is a symmetric model. At the end of the… Continue reading

## Stress Concentrations on Shafts

Any abrupt change in parts can capture internal stresses and cause stress concentrations. Examples of these changes are the following: grooves holes notches shoulders keyseats threads splines   The stress concentrations are localized… Continue reading

## Pressfit Assembly Process Simulation

Intro A novel approach of the assembly process of a pressfit is shortly presented. A pressfit is a method of fastening between two mating parts. The parts are pushed together and are hold… Continue reading

## Robustness and Durability simulation, e-Motor

Objective: Robustness & Durability Loads: Interference fit, bolt preload, PSD and sine sweep vibration profiles, etc. Solution type: Modal Analysis, Harmonic response Random vibration Fatigue Modeling aspects: Full e motor (~ 35 parts)… Continue reading

## Protected: Random Vibration Fatigue Optimization, e-Motor

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## Random Vibration Fatigue Simulation, e-Motor

Objective: Random Vibration Fatigue Damage and Life factor estimation Developed new methodology for prestress effects in structural dynamics Reduced simulation run time of large models with parallel computation techniques

## Random Vibration, e-Motor

Objective: Random Vibration Modeling aspects: Full e motor (~ 35 parts) ~ 30 million dofs Test specifications of random vibration are simulated before physical test in order to develop design in early development… Continue reading

## Harmonic Response, e-Motor

Objective : Harmonic response Modeling aspects: Full e motor (~ 35 parts) ~ 30 million dofs Results of unit loading harmonic response in three directions where used in subsequent solution steps of robustness… Continue reading

## Modal Analysis, e-Motor ( e-Axle+GB)

Objective: Modal Analysis Modeling aspects: Full e motor (~ 35 parts) ~ 30 million dofs Modal analysis simulation as first step of random vibration fatigue studies Modal quantities used in subsequent steps