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1
Content available remote Analysis of Degressive Front Car Crash Structures
Szlosarek R., Neuber R., Kröger M.
Machine Dynamics Research
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2018
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Vol. 42, No. 2
45--51
EN
Minimizing the injury risk to passengers in frontal crash situations represents the superior goal of the car structure engineering. In contrast to the existing systems, the use of a degressive front car structure can improve the crash performance. This paper presents a finite element modelling method allowing to study the influence of the force-displacement curve of the main chassis beam on the crash performance with respect to the passenger injury risk. A solution for realizing a degressive main chassis beam was tested in a drop tower. The result shows that the constructed main chassis beam works, and that it significantly reduces the injury risk to the passenger.
2
Content available remote Development of Crash Absorbers Made of Carbon Fibre-Reinforced Plastic Based on Experimental Studies
Szlosarek R., Bombis F., Mühler M., Kröger M.
Machine Dynamics Research
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2015
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Vol. 39, No. 4
65-72
EN
Crash absorbers made of carbon fibre-reinforced plastics (CFRP) become more and more popular to reduce mass in the front structure of cars. One open question in this issue is the correct layup, which specifies the fibre orientation, in order to obtain high specific energy absorption. Within the research, a first test series investigates crash absorbers with a fibre orientation in axial and circumferential direction and an orientation of ±45°. Based on these first experimental studies an optimisation of the layup results in a crash absorber made of CFRP with a significant higher specific energy absorption than a comparable crash absorber made of aluminium.
3
Content available remote Investigation on the Dynamics of Tool Grinding
Payrebrune K. M., Kröger M., Deichmueller M., Denkena B.
Machine Dynamics Problems
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2009
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Vol. 33, No. 2
92-104
EN
The manufacturing of high-performance carbide tools, like drills or milling cutters, is realized by a grinding process because of the strength and hardness of the used material. Due to the process forces and the cantilevering clamped workpiece, the blank bends and unwanted geometry errors occur. Additionally, great efforts are made to find optimal parameters for stable process conditions. In this work the interaction phenomena of tool grinding process and machine structure are analyzed and modelled. Thereby, the dynamic behaviour of workpiece, grinding wheel, and machine structure is experimentally investigated. Additionally, force signals of the grinding processes are measured and analyzed in time and frequency domain.
4
Content available remote Experimental Results and Models of the Tire/Road Contact
Kröger M., Gäbel G., Moldenhauer P.
Machine Dynamics Problems
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2007
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Vol. 31, No. 2
84-94
EN
The contact between tire tread block and road surface is very complicated and usually unknown. The dynamic behaviour of the tread blocks is strongly influenced by the contact situation e.g. contact stiffness, local friction coefficient as well as wear which changes the tread block geometry and in hence the local contact forces. Within this paper a dynamic tread block model is presented describing the dynamic tread block behaviour using an effective reduction method. The model is built up modularly and combines the non-linear contact stiffness due to the rough surface, the local friction coefficient in dependency of the relative velocity and wear mechanisms. Measurements of the different contact phenomena which are considered in the model are shown and exemplary simulation results are presented to clarify the effectiveness of the modular model.
5
Content available remote Experimental and Analytical Investigation of Rubber Adhesion
Kröger M., Popp K., Kendziorra N.
Machine Dynamics Problems
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2004
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Vol. 28, No. 1
79-89
EN
The total friction between tyre and road is based on hysteresis induced friction and adhesion induced friction. A pendulum test rig is designed for experimental investigations of the adhesion effect of rubber and the geometrical and material influences. Based on the Hertzian contact theory the hysteresis and adhesion is described by energy considerations.
6
Content available remote Stick-Slip Vibrations of Pneumatic Seals
Lindner M., Kröger M., Popp K.
Machine Dynamics Problems
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2001
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Vol. 25, No. 3/4
121-130
EN
In the present paper the dynamic friction process of a pneumatic seal is investigated. A test facility for measuring forces, displacements and velocities on a lubricated seal lip has been used. The measurements indicate that the friction force depends on several parameters. Stick-slip effects are found in the low velocity range. After the identification of the system parameters these vibrations have been modelled. It turned out that dynamic friction force can be described well by a first order differential equation.
7
Content available remote Energy Absorption by Plastic Deformation Using Inversion of Tubes
Kröger M., Popp K.
Machine Dynamics Problems
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2000
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Vol. 24, No. 1
101-103
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