Tuneable Spring Element for an Adaptable Vibration Absorber

Hansmann, Jan; Kaal, William; Seipel, Björn; Melz, Tobias

doi:10.1365/s38311-012-0156-2

Cited by 4 publications

(2 citation statements)

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“…The semi-active, tunable spring in parallel to the actuator is used to keep the force requirements of the actuator low, especially for applications with higher static loads. The tunable spring was realized using the mechanism presented in [18]. Figure 4 shows the basic principle, which is to change to free length ϕ of a ring segment to change its stiffness.…”

Section: The Mechanical Hardware-in-the-loop (Mhil) Systemmentioning

confidence: 99%

Tuning and Emulation of Mechanical Characteristics – Tunable Mounts and a Mechanical Hardware-in-the-Loop Approach for More Efficient Research and Testing

Millitzer

Hansmann

Lapiccirella

et al. 2021

Lecture Notes in Mechanical Engineering

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Numerical simulations offer a wide range of benefits, therefore they are widely used in research and development. One of the biggest benefits is the possibility of automated parameter variation. This allow testing different scenarios in a very short period of time. Nevertheless, physical experiments in the laboratory or on a test rig are still necessary and will still be necessary in the future. The physical experiments offer benefits e.g. for very complex and/or nonlinear systems and are needed for the validation of numerical models.Fraunhofer LBF has developed hardware solutions to bring the benefit of rapid and automated parameter variation to experimental environments. These solutions allow the tuning and emulation of the mechanical properties, like stiffness, damping and eigenfrequencies of structures.The work presents two approaches: First a stiffness tunable mount, which has been used in laboratory tests in the field of semi-active load path redistribution. It allowed the researcher to test the semi-active system under different mechanical boundary conditions in a short period of time. Second, a mechanical Hardware-in-the-loop (mHIL) approach for the NVH development of vehicles components is presented. Here a mHIL-system is used to emulate the mechanical characteristics of a vehicle’s body in white in a wide frequency range. This allows the experimental NVH optimization of vehicle components under realistic boundary conditions, without actually needing a (prototype) body in white.

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Section: The Mechanical Hardware-in-the-loop (Mhil) Systemmentioning

confidence: 99%

Tuning and Emulation of Mechanical Characteristics – Tunable Mounts and a Mechanical Hardware-in-the-Loop Approach for More Efficient Research and Testing

Millitzer

Hansmann

Lapiccirella

et al. 2021

Lecture Notes in Mechanical Engineering

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“…Whereas only a few comprise a variable mass (e.g., by pumping water [5] or using inerter mass effects [6]), most concepts use a variable stiffness element. Some are based on the geometric change of bending elements or the pre-stressing of beams [7]; good results have also been achieved with a ring-shaped spring element with variable support points [8]. Other works have studied the use of smart materials for the realisation of adjustable vibration absorbers: shape-memory alloys [9], magneto-rheological elastomers [10,11], magneto-rheological gels [12], dielectric elastomers [13] and shunted piezoelectric transducers [14] have all been applied to FATMD concepts.…”

Section: Introductionmentioning

confidence: 99%

Frequency-Adaptable Tuned Mass Damper Using Metal Cushions

2021

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A frequency-adaptable tuned mass damper (FATMD) using metal cushions as tuneable stiffness components is presented. The dynamic properties of the cushions with respect to stiffness and damping are investigated experimentally in this context. The natural frequency of the experimental FATMD is found to be dependent on the precompression of the metal cushions, which behave like nonlinear springs, yielding an adjustable frequency range from 67 to 826 Hz. As the precompression is increased, the stiffness increases while the damping characteristics decrease, the effect of which was quantified using a viscous mass damper model as a first approximation. Measurements have been carried out under five different excitation amplitudes to investigate the amplitude dependency of the resonance frequency. The FATMD was largely unaffected by changes in input amplitude. It was concluded that metal cushions show great potential for use in FATMDs, surpassing the utility of elastomers, especially with respect to their temperature stability.

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