فهرست مقالات semi-active control

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  1 - Active Control of Sandwich Microbeams Vibration with FGM and Viscoelastic/ER Core
  Amir Hossein Yousefi farhad kiani Esmaeil Abedi
  10.30486/admt.2023.1960808.1356
  This study is devoted to analyse of free and forced vibrations and semi-active control vibrations of sandwich microbeam with Functionally Graded Materials (FGM) and viscoelastic/electrorheological (ER) core. The intended model is for top and bottom layers of functionall چکیده کامل

  This study is devoted to analyse of free and forced vibrations and semi-active control vibrations of sandwich microbeam with Functionally Graded Materials (FGM) and viscoelastic/electrorheological (ER) core. The intended model is for top and bottom layers of functionally graded materials with power law and a core model for Viscoelastic materials with complex shear modulus. Hamilton principle is used to determine the governing Equations of motion on the sandwich microbeam based on the modified couple stress theory. Mesh less method of Radial Basis Functions (RBF) is used to calculate natural frequency and the loss factor. All the effects of length scale parameter, shear modulus and changes due to variation of the electric field on the natural frequency and loss factor have been drawn. Combination of RBF method and forward difference led to evaluation of forced vibration and deflection of microbeam for length scale parameters and different electric fields under the dynamic load have been calculated and drawn. The feedback effects are analyzed for vibration amplitudes of sandwich microbeam by using Linear Quadratic Gaussian (LQG) and optimal control method. At the end, the results are compared with papers for different viscoelastic models such as Kelvin model, Bingham plastic model and complex modulus. پرونده مقاله
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  2 - Response of the Wind Excited Benchmark Building Upgraded with SAEMFDs
  Veeranagouda B. Patil
  Dynamic behavior of the wind-excited-benchmark-building using Semi-Active Electromagnetic Friction Dampers (SAEMFDs), with modulated homogeneous friction algorithm is presented. The performance of the benchmark building is studied under across wind loads by installing t چکیده کامل

  Dynamic behavior of the wind-excited-benchmark-building using Semi-Active Electromagnetic Friction Dampers (SAEMFDs), with modulated homogeneous friction algorithm is presented. The performance of the benchmark building is studied under across wind loads by installing the SAEMFDs with smooth boundary layer semi-active friction (SBLSAF) algorithm. The governing equations of motion are solved by employing state space formulation. Initially, one damper in each of the upper 26 storeys of the building is installed and later on the optimization of the location and the number of dampers required is carried out till the comparable performance criteria are obtained. The criterion selected for optimality was controllability index, obtained with the help of root-mean-square (RMS) value of the inter-storey drift. The performance of SAEMFDs is compared with that of passive friction dampers. Further, a parametric study is carried out by varying the value of controller gain (β). For each value of β, a parametric study of SAEMFDs by varying the value of the parameter representing the measure of the thickness of the boundary layer α is carried out. From the numerical study, it is found that SBLSAF algorithm is quite effective in enhancing the quality of the performance of the benchmark building. Optimization of location of dampers gives an economical solution to the vibration control of the benchmark building. پرونده مقاله