B. Fukker

59474938600

Publications - 4

Experimental modal analysis based TPA method of wiper system linkage vibration amplification

Zoltán Gazdagh L. L. Szabo M. Bubreg B. Fukker T. F. Varga

Publication Name: Proceedings of ISMA 2024 International Conference on Noise and Vibration Engineering and Usd 2024 International Conference on Uncertainty in Structural Dynamics

Publication Date: 2024-01-01

Volume: Unknown

Issue: Unknown

Page Range: 3557-3571

Description:

Acoustic transfer functions from mounting points of front wiper systems on vehicle body to driver ear positions can describe vehicle noise transfer properties. Component based TPA methods can be applied to characterize the wiper system as a noise source from the vehicle point of view. The same methods can be utilized to characterize the wiper drive as a noise source from the wiper linkage point of view. The paper presents a method to characterize the transfer properties of the linkage independent from the drive excitation. The linkage amplification method presented here provides force-force transfer functions from drive connection locations to the linkage and mounting point locations of the linkage to the vehicle body. The presented procedure focuses on TPA method within a vehicle component. Synthetized FRFs calculated at drive connection locations and at mounting points of the linkage at measured points of the modal model from experimental modal analysis are used for calculating the linkage amplification functions.

Open Access: Yes

DOI: DOI not available

Rattling detection of electric components

Zoltán Gazdagh J. A. Erdelyi A. Bartus B. Fukker

Publication Name: Proceedings of ISMA 2024 International Conference on Noise and Vibration Engineering and Usd 2024 International Conference on Uncertainty in Structural Dynamics

Publication Date: 2024-01-01

Volume: Unknown

Issue: Unknown

Page Range: 2799-2813

Description:

The study emphasizes the importance of detecting and addressing the issue of nonlinear phenomena in electronic components, due to their potential implications for structural integrity, damage or malfunction to sensitive electronic elements, and a reduction in overall vehicle reliability. This investigation based on time-domain experimental data facilitates rattling detection that aims to distinguish rattling from other type of nonlinearities. The sample is screwed on a fixture, which is mounted on an electrodynamic shaker that serves as the excitation source. The excitation signal is a closed loop sinusoidal sweep, measured in both directions and at different amplitudes. The paper will focus on several methods for identifying nonlinear phenomena, such as the Poincare map or Hilbert transformation. Phase plots are produced, that serve as a valuable tool for studying anomalies, which can be correlated to the extremes of Lyapunov exponents. The above methods are evaluated on their ability to separate rattling form other phenomena to identify genuine instances of rattling.

Open Access: Yes

DOI: DOI not available

Control of transfer function distortion during RPM-sweep testing of e-drive systems

Balázs Vehovszky Zoltán Gazdagh D. Acs B. Fukker

Publication Name: Proceedings of ISMA 2024 International Conference on Noise and Vibration Engineering and Usd 2024 International Conference on Uncertainty in Structural Dynamics

Publication Date: 2024-01-01

Volume: Unknown

Issue: Unknown

Page Range: 3779-3787

Description:

This study is focusing on the distortion phenomenon of the vibrational resonance peak when testing an e-drive assembly via RPM-sweep excitation. As the ramp rate increases, the measured response function deviates more and more from the stationary response. This distortion leads to a reduced peak amplitude, a shift in resonant frequency, changes in response shape and consequently, results in an increased half-power bandwidth, eventuating an increased apparent modal damping. These changes in the response are dependent on the sweeping direction and other physical parameters as well, like oil pressure and -temperature. The phenomenon was investigated earlier for linear systems, but not for operational testing of rotary machines, where the characteristics of the spectrum distortion are governed by different principles and are influenced by many other physical factors. A novel way for handling amplitude distortion of e-drives during transient testing is elaborated, which can be used to optimize RPM-sweep rate and other measurement parameters.

Open Access: Yes

DOI: DOI not available

Unlocking the insights of dynamics through experimentation of an electric drive

Balázs Vehovszky Zoltán Gazdagh B. Fukker

Publication Name: Proceedings of ISMA 2024 International Conference on Noise and Vibration Engineering and Usd 2024 International Conference on Uncertainty in Structural Dynamics

Publication Date: 2024-01-01

Volume: Unknown

Issue: Unknown

Page Range: 2022-2030

Description:

This experimental example shows a study of the e-drive lamellae package, where the layered, punched sheets are axially compressed and the permanent magnets are embedded in the laminations. When studying such systems, using Restoring Force Surface (RFS) method allows users to create a snapshot of the behavior of the dynamic system. Due to the potential impact on the end user's perception of vehicle quality, the consideration of the changes in resin stiffness over time, the evolution of the time-dependent dynamic response in systems like Laminated Rotor Cores (LRC) remains an aspect in development. Technology development of nonlinear characterization of Laminated Rotor Cores (LRC) under different conditions allows engineers to understand how the dynamics evolve in time. Aging and hardening of polymer resin coating change the dynamics of the system. This change may be accelerated through thermal and centrifugal stress cycles or micro crack propagation of the resin coating. This investigation guides through the approach of nonlinear detection, and characterization and gives suggestions on how to linearize such systems.

Open Access: Yes

DOI: DOI not available