In this research, the dynamic response and vibration control of a sandwich piezoelectric cylindrical shell buried in an elastic medium under the effect of a moving ring load has been investigated. First, the dynamic equations of the shell are obtained based on Love's thin-walled shell theory, and then they are coupled with the governing equations of the surrounding elastic medium. Then, the resulting differential equations are solved using the Fourier transform, and after using Gauss's numerical integral for the inverse Fourier transform, the steady state dynamic response of the system is obtained. To reduce the vibrations caused by the moving load, a PID controller with optimized constants has been used. With extensive research done, the innovation presented in this research is the active reduction of the level of vibrations of a smart buried shell (pipe, tunnel) under the effect of a moving applied load. In a way, this innovation is at the same time being buried in the unlimited elastic environment and the piezoelectricity of the shell. The results show that the implemented controller is able to reduce the displacement range and stress in the system. Also, the operation of the piezoelectric active layer based on the appropriate controller reduces the sensitivity of the system to parameter changes.

The dynamic rheological properties of injection moulding of feedstock powder-binder blends (suspension) based on iron powder and HDPE (High Density Polyethylene) were investigated by using a parallel plate rheometer. The solid content ranging from 30 to 60 vol% of the total volume of loaded metal powder, compatibilizer, stearic acid, and stearamide. The dynamic rheological response of the materials was used to analysis the effect of the mentioned factors on the material functions of the mixtures (dynamic viscosity  h*, storage modulus G’, and loss modulus G”) at frequency range 0.1-100 s-1. These parameters showed large differences in the response of the suspensions with changes in loading and addition of compatibilizer. All dynamic parameters increase by increasing the volume fraction of solid loading. As compatibilizer, stearamide shows a significant effect on rheological behaviour of suspensions. Falkner-Schmit models were used to fit the experimental rheological data. It was found that our experimental data and modified composition fit the modified forms of these models.

The purpose of this paper is to analysis the viscoelastic models under dynamic loading. A five parameter model is chosen for study exhibits elastic, viscous, and retarded elastic response to shearing stress. The viscoelastic specimen is chosen which closely approximates the actual behavior of a polymer. The module of elasticity and viscosity coefficients are assumed to be space dependent i.e. functions of 'x' in non-homogeneous case and stress-strain are harmonic functions of time 't' The expression for relaxation time for five parameter viscoelastic model is obtained by using constitutive equation. The dispersion equation is obtained by using Ray techniques. The model is justified with the help of cyclic loading for maxima or minima.

This study focusses on studying soaking and leaching effects on gypseous soil at both static and dynamic conditions. The soil used was Natural gypseous soil with 50% gypsum. Three parameters were studied (deformation ratio, dissolve gypsum salts and hydraulic conductivity) in both static and dynamic conditions. 20 tests were caried by laboratory model manufactured locally. A platform base connected to loading frame was designed in a manner that allow free movement provided for dynamic test, as in earth quake. Results of experimental work reviled that the deformation ratio S/B (settlement /footing width) for sample subjected to 30 seconds vibration was 15 times that of sample without vibration. On the other hand, 70% of hydraulic conductivity was achieved at the first 10 minutes leaching for model subjected to 30 seconds vibration. That reflects the effect of earth quack on structures constructed on such problematic soil. Author recommend to take cautions when constructing footings beside any dynamic soars specially in gypseous soil.

This study evaluated the effect of different dynamic and static loadings and different storage periods on the firmness of pear fruit. Pear fruit was first segregated into three groups of 27 pear in order to undergo three loadings: static thinedge compression loading, static wide-edge compression loading and dynamic loading. All loaded pears were stored in accordance with three storage period designs: 5-day storage, 10-day storage, and 15-day storage. Following each period, the variations of pear texture were scanned by using the CT-Scan technique as a non-destructive test. Then, the firmness of pear texture was measured using a penetrometer. Data were simulated and evaluated using MLP and RBF artificial neural networks. The results showed that with increasing storage time and loading force, the firmness significantly decreased (1% level) in all three types of loading, In addition, pear texture was destructed under dynamic compression loading in order to compare with other two loadings. Best value artificial neural network for wide edge loading (12 neuron-RBF) was (R2 Wide edge= 0. 9738– RMSE Wide edge=0. 3419-MAE Wide edge =0. 268) and for thin edge loading (4 neuron-RBF) was (R2Thin edge = 0. 9946– RMSE Thin edge =0. 170977-MAE Thin edge =0. 133), also for dynamic loading (8 neuron-RBF) was (R2 Dynamic loading = 0. 9933– RMSE Dynamic loading =0. 230-MAE Dynamic loading= 0. 187).

Approximate dynamic analysis of structures is achieved by fast wavelet transform (FWT). The loads are considered as time history earthquake loads. To reduce the computational work, FWT is used by which the number of points in the earthquake record is reduced. For this purpose, the theory of wavelets together with filter banks is used. The low and high pass filters are used for the decomposition of earthquake records in the high and low frequency of the records. The low frequency content is the most important part; therefore this part of the record is used for dynamic analysis. A number of structures are analyzed and the results are compared with exact dynamic analysis and the Fast Fourier method (FFT).