Experimental direct spatial damping identification by the Stabilised Layers Method

Lisitano, Domenico; Bonisoli, Elvio; Mottershead, John E.

doi:10.1016/j.jsv.2018.08.055

Cited by 8 publications

(5 citation statements)

References 20 publications

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“…These data were used in a 6 dofs lumped parameter model to compute the dynamic behavior of the test bench, and the experimental outcomes and numerical results matched with a high accuracy. With further analyses, the proposed methodology can be used to conduct an accurate study on the effects of structural damping; for example, a measurement of the damping occurring in the meshing can be carried out as in [35]. Another possible use of this methodology is related to the effect of the lubricant, in particular to experimentally measure the stiffness and damping components introduced by the lubricant film.…”

Section: Discussionmentioning

confidence: 99%

A Methodology for Measuring Actual Mesh Stiffness in Gear Pairs

Rosso,

Bruzzone,

Lisitano

et al. 2024

Vibration

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The measurement of the meshing stiffness in gear pairs is a technological problem. Many studies have been conducted, but a few results are available. A tailored test bench was designed and realized to measure the Static Transmission Error in two mating gears to address this issue. The bench is capable of testing several kinds of gears, e.g., spur, helical, conical, and internal, and it measures the transmission error concerning the applied torque. The Static Transmission Error is due to the variable stiffness of the gear teeth during a mesh cycle. In this paper, a dynamical method for measuring gear mesh stiffness is presented. The tooth stiffness is estimated from the torsional modal behavior of the rotating parts of the test bench. The dynamics of the system are acquired using accelerometers and very precise encoders to measure the angular accelerations and displacements of rotating parts. The torsional mode shapes are identified; those that show a vibrational behavior of the gears that do not follow the transmission ratio’s sign of the mating kinematic condition are selected because they depend on the flexibility of the teeth. In such a way, the engagement stiffness is estimated from the natural frequencies of the selected mode-shapes and the known inertia of gears and shafts. The experimentally identified results are also compared with numerical values computed with a commercial software for mutual validation.

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Section: Discussionmentioning

confidence: 99%

A Methodology for Measuring Actual Mesh Stiffness in Gear Pairs

Rosso,

Bruzzone,

Lisitano

et al. 2024

Vibration

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“…Lee et al 28 utilized curved-edge diffraction to improve the dimensional measurement technique, and the dynamic parameters for a ball bearing spindle system was obtained. Domenico Lisitano et al 29 formulated a so called layer method for damping matrix identification using the experimental receptance- -matrix data together with physical connectivity constraints. The method could overcome the ill-conditions and is stable for various frequency ranges.…”

Section: Introductionmentioning

confidence: 99%

Identification and modelling of dynamic parameters for round link chains subject to axial loads

Zhang

Sun

et al. 2022

Sci Rep

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A round link chain subject to axial dynamic loads composes a nonlinear viscoelastic system. Unlike the classical pounding problems, the round link chain will not only suffer linear elastic deformation, but also nonlinear plastic or impacting deformation. Based on theoretical formulation and experiments, a new approach is presented in this paper to model and identify the nonlinear dynamic parameters, namely the stiffness and damping for the round link chain. With linear deformation, nonlinear deformation and energy dissipation considered, a modified nonlinear viscoelastic model is developed to describe the vibrational behavior of the chain with numbers of round links. The linear elastic model and impacting model are combined to derive the equivalent nonlinear stiffness, while experiments and the least square fitting method are employed to identify the nonlinear damping according to the modified nonlinear viscoelastic model. The influences of the key parameters such as the length of the chain, elastic module and loading frequency on the dynamic stiffness and damping are investigated. Another test is performed to validate the identification model and good agreements are observed.

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“…However, damping mechanisms in real structures arise from more complex mechanisms and hence viscous/proportional damping can fail to predict accurately its real effect on the overall dynamics. Significant effort is still put in the quest for identifying both viscous [3] and non-viscous [4] mechanisms experimentally.…”

Section: Introductionmentioning

confidence: 99%