Natural frequency analysis of the pushpart of a metal pushbelt continuous variable transmission

For vehicles equipped with continuous variable transmissions (CVT) higher standards regarding noise and vibration reduction are demanded. Research by Bosch Transmission Technology (Bosch) has shown that there is a relation between noise and vibrations originating from the differential of the driveline and pushpart vibrations inside the CVT....

Dynamic simulation of pantograph catenary interaction by means of finite elements and a reduced order model

As train speeds continue to increase, the dynamics of the interface between train and infrastructure is an increasingly important factor in current collection performance. European legislation prescribes that assessment of the quality of the current collection system shall be performed according to measurements and/or simulations. Due to the...

Towards Hybrid Modular Design of Structural Dynamic Models

Observability and transferability of in-situ blocked force characterisation

Modeling of a reververation chamber and acoustic control

During a rocket launch a spacecraft is, among other loads, exposed to a potentially damaging acoustic load. Prior to space flight, ground tests are performed to determinewhether a spacecraft, or a specific part thereof, can withstand the acoustic load. These tests take place in a reverberation chamber. An acoustic feedback control algorithm...

Correlation and Error Localization: Analytical versus Experimental Dynamics of a Large Structural Assembly

In the high tech industry the performance of a system generally depends heavily on the system’s structural dynamic behaviour. Relatively small resonating components can alter the dynamics of the assembly significantly. Due to the presence of many small components and limited test resources it is often difficult to find the disruptor. In this...

Experimental Dynamic Substructuring: Coupling and Decoupling

The need to analyze and optimize the large and complex structures, locally and globally, and have knowledge of local and global dynamic, has induced the notion of Dynamic Substructuring. In the course of time several DS techniques are developed from which some are mainly based on experimental routine. They are known as experimental DS and...

Identification of damping in joints using dynamic substructuring techniques

Predicting and characterizing damping in joints and connections is a bottleneck in many design processes. New analysis techniques can be used to advance the engineering practice. These techniques would for example be useful to make a better estimation of the coupled dynamics of an engine-generator set (gen-set) on a ship. Large ships are...

Improvements on Time-Frequency Analysis using Time-Warping and Timbre Techniques

Spectral analysis of non-stationary signals is known to be a challenging task. Classical methods like the discrete Fourier transform are often inadequate to capture and track periodic content with rapidly changing frequencies. This is basically for two reasons. On one hand, the Fourier transform is intended for expressing frequency content in...