An approach on identification of equivalent properties of honeycomb core using experimental modal data

Jiang, Dong; Zhang, Dahai; Fei, Qingguo; Wu, Shaoqing

doi:10.1016/j.finel.2014.06.006

Cited by 46 publications

(24 citation statements)

References 25 publications

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“…Hence, the homogenization procedure has been employed to replace the inhomogeneous material with a layer of homogeneous material, whose mechanical behavior remains to be same as the inhomogeneous material; in this way, a large number of grids are saved. Several homogenization methods have been proposed in previous studies [12][13][14][15][16] adapted to different physical problems. To calculate the effective sound velocity in an inhomogeneous mixture of two-phase materials, some complex empirical formulas were established based on the volume concentration of each component [12,13].…”

Section: The Equivalent Modulus Methodsmentioning

confidence: 99%

“…To calculate the effective sound velocity in an inhomogeneous mixture of two-phase materials, some complex empirical formulas were established based on the volume concentration of each component [12,13]. Based on experimental or numerical data, some theoretical approaches were developed to compute the equivalent elastic modulus of honeycomb [14,15]. The equivalent complex moduli of laminated glass beams were also obtained with a purely experimental method [16].…”

Section: The Equivalent Modulus Methodsmentioning

confidence: 99%

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Equivalent modulus method for finite element simulation of the sound absorption of anechoic coating backed with orthogonally rib-stiffened plate

Jin

Yin

Liu

2016

Journal of Sound and Vibration

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The finite element method is often used to investigate the sound absorption of anechoic coating backed with orthogonally rib-stiffened plate. Since the anechoic coating contains cavities, the number of grid nodes of a periodic unit cell is usually large. An equivalent modulus method is proposed to reduce the large amount of nodes by calculating an equivalent homogeneous layer. Applications of this method in several models show that the method can well predict the sound absorption coefficient of such structure in a wide frequency range. Based on the simulation results, the sound absorption performance of such structure and the influences of different backings on the first absorption peak are also discussed.

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Section: The Equivalent Modulus Methodsmentioning

confidence: 99%

Section: The Equivalent Modulus Methodsmentioning

confidence: 99%

Equivalent modulus method for finite element simulation of the sound absorption of anechoic coating backed with orthogonally rib-stiffened plate

Jin

Yin

Liu

2016

Journal of Sound and Vibration

View full text Add to dashboard Cite

show abstract

“…The identification of composite material parameters belongs to the category of inverse problem. 9,10 Sepahvand and Marburg 11 developed an inverse stochastic method based on the non-sampling generalized polynomial chaos method for identifying uncertain elastic parameters from experiment modal data. Multiscale method is an important method to predict the cyclical composite parameters.…”

Section: Introductionmentioning

confidence: 99%

Temperature-dependent thermo-elastic parameter identification for composites using thermal modal data

Jiang

Zhu

et al. 2019

Advances in Mechanical Engineering

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To accurately determine the temperature-dependent parameters of composites, a thermo-elastic parameter identification approach using thermal modal data is proposed in this article. The investigation is based on two hypotheses: (1) the structure is at steady-state temperature field, which means the temperature distribution is time independent; (2) temperature distribution can be determined in advance of thermo-elastic parameter identification, and thermal-related large deformation is not considered. The thermal-dependent elastic constants and thermal expansion coefficients are expressed as intermediate functions with the independent variable of temperature, perturbation method is adapted to calculate the sensitivity of thermal modal frequencies with respect to the intermediate variables, and variables with high sensitivity are selected as the identifying parameters. By constructing the intermediate function and calculating the relative sensitivity, thermo-elastic parameters are identified by minimizing the residual between experimental and analytical natural frequencies under thermal circumstance. Two different types of composite models are employed to verify the strategies of parameter identification. Results show that on the basis of the intermediate function, the proposed approach can be applied to identify the thermo-elastic parameters effectively.

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“…Parameterization plays an important role in the stiffness identification of boundary conditions [11,12]. Mottershead et al [13] indicated that parameterization is critical in updating of boundary conditions, the boundary stiffness in a cantilever was modeled as the effective length of elements closest to the joint.…”

Section: Introductionmentioning

confidence: 99%

Stiffness identification of boundary conditions by using thin-layer element for parameterization

Jiang¹,

Tian²,

Yimeng³

et al. 2019

Vib. proced.

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The stiffness of boundary conditions in mechanical structures is difficult to represent. A method is proposed to model the mechanical performance of the clamped boundary condition based on thin-layer element. Firstly, the contact surface of clamped boundary condition is parameterized by using isotropic thin-layer element to model the normal and tangential contact stiffness. Secondly, material parameter of thin-layer element is identified by using experimental modal data, parameter identification is transformed as an optimization problem. Experimental investigation is undertaken to verify the proposed method by employing an aluminum honeycomb panel, the numerical model of which is constructed by using the equivalent theory. Thin-layer elements with different properties are used to simulate the mechanical properties in different area of the boundary conditions, and the experimental modal data is adopted to identify the material parameters. Results show that the width to thickness ratio of the thin layer element has a great influence on the identification results.

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An approach on identification of equivalent properties of honeycomb core using experimental modal data

Cited by 46 publications

References 25 publications

Equivalent modulus method for finite element simulation of the sound absorption of anechoic coating backed with orthogonally rib-stiffened plate

Equivalent modulus method for finite element simulation of the sound absorption of anechoic coating backed with orthogonally rib-stiffened plate

Temperature-dependent thermo-elastic parameter identification for composites using thermal modal data

Stiffness identification of boundary conditions by using thin-layer element for parameterization

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