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Monitoring and control of multiple fraction laws with ring based composite structure
Khadimallah, Mohamed A.,Hussain, Muzamal,Naeem, Muhammad Nawaz,Taj, Muhammad,Tounsi, Abdelouahed Techno-Press 2021 Advances in nano research Vol.10 No.2
In present article, utilizing the Love shell theory with volume fraction laws for the cylindrical shells vibrations provides a governing equation for the distribution of material composition of material. Isotopic materials are the constituents of these rings. The position of a ring support has been taken along the radial direction. The Rayleigh-Ritz method with three different fraction laws gives birth to the shell frequency equation. Moreover, the effect of height- and length-to-radius ratio and angular speed is investigated. The results are depicted for circumferential wave number, length- and height-radius ratios with three laws. It is found that the backward and forward frequencies of exponential fraction law are sandwich between polynomial and trigonometric laws. It is examined that the backward and forward frequencies increase and decrease on increasing the ratio of height- and length-to-radius ratio. As the position of ring is enhanced for clamped simply supported and simply supported-simply supported boundary conditions, the frequencies go up. At mid-point, all the frequencies are higher and after that the frequencies decreases. The frequencies are same at initial and final stage and rust itself a bell shape. The shell is stabilized by ring supports to increase the stiffness and strength. Comparison is made for non-rotating and rotating cylindrical shell for the efficiency of the model. The results generated by computer software MATLAB.
An innovative system for novel vibration of rotating FG shell with combination of fraction laws
Khadimallah, Mohamed Amine,Hussain, Muzamal,Al-Thobiani, Faisal,Elbahar, Mohamed,Al Naim, Abdullah F.,Elimame, Elaloui,Harbaoui, Imene,Tounsi, Abdelouahed Techno-Press 2021 Advances in concrete construction Vol.12 No.2
A new model with the combination of the Galerkin's technique have been developed for functionally graded cylindrical shell. For the vibrations of rotating cylindrical shells, three volume fraction laws i.e., polynomial, trigonometric and exponential are combined mathematically. The obtained results show that by increasing length-to-radius and height-to-radius ratios, the backward and forward frequency value decreases and increases, respectively. Moreover, on increasing the rotating speed, the backward frequencies increases and forward frequencies decreases. The results generated furnish the evidence regarding applicability of present model with clamped-clamped boundary conditions and also verified by earlier published literature.
Khadimallah, Mohamed A.,Hussain, Muzamal,Harbaoui, Imene Techno-Press 2020 Advances in concrete construction Vol.10 No.6
In current study, utilizing the Kelvin's theory with polynomial, exponential and trigonometric volume fraction laws for functionally graded cylindrical shell vibrations. Effects of different parameters for ratios of length- and height-to-radius and angular speed versus fundamental natural frequencies been determined for two categories of cylindrical shells with clamped-free edge condition. By increasing different value of height-to-radius ratio, the resulting backward and forward frequencies increase and frequencies decrease on increasing length-to-radius ratio. Moreover, on increasing the rotating speed, the backward frequencies increases and forward frequencies decreases. The frequencies are same when the cylinder is stationary. The frequencies increases and decreases on changing the constituent materials. The frequency results are verified with the earlier literature for the applicability of present model.
Polymers in construction: A brief review authors
Khadimallah, Mohamed Amine,Harbaoui, Imene,Hussain, Muzamal,Qazaq, Amjad,Ali, Elimam,Tounsi, Abdelouahed Techno-Press 2022 Advances in concrete construction Vol.13 No.2
Polymers, particularly plastics, have been widely seen as an existential risk to the environment due to their contribution to pollution, carbon emissions and climate change. Many argue that it is possible to substantially ease the threat of plastics by engaging the public in reducing their use in day-to-day life and implementing efficient domestic waste management strategies. On the other hand, polymers and plastics in building and construction are considerably less problematic, if not attractive. In fact, the applications of polymers in construction have been continuously expanding. This is partly due to the developments made in this area being implemented within a sustainable development strategy. In this paper, the main applications of polymers in construction have been revisited and an overview of the research topics in each application has been briefly presented.
Parametric vibration analysis of single-walled carbon nanotubes based on Sanders shell theory
Khadimallah, Mohamed A.,Hussain, Muzamal,Taj, Muhammad,Ayed, Hamdi,Tounsi, Abdelouahed Techno-Press 2021 Advances in nano research Vol.10 No.2
This paper based on Sanders theory aims to investigate the vibration of SWCNTs considering the clamped-simply supported, clamped-free, clamped-clamped and simply supported-simply supported end conditions. After developing the governing equation of the objective system, the Rayleigh-Ritz technique is implemented for the purpose of obtaining the frequency equation in the eigen form. In addition, the applicability of this model for the analysis of vibration of CNTs is examined with the effect of length and ratio of height-to-radius. A detailed description of different types of SWCNTs with different indices is provided in the theoretical methodology. The effect of extended length is stimulated with increasing the radii and the model is effective because it also predicts the effect of thickness on vibration of SWCNTs. For different boundary conditions, the present results are verified with earlier literature.
Vibration of SWCNTs: Consistency and behavior of polynomial law index with Galerkin's model
Khadimallah, Mohamed A.,Hussain, Muzamal,Khedher, Khaled Mohamed,Bouzgarrou, Souhail Mohamed,Al Naim, Abdullah F.,Naeem, Muhammad Nawaz,Taj, Muhammad,Iqbal, Zafar,Tounsi, Abdelouahed Techno-Press 2020 Advances in nano research Vol.9 No.4
In this article, vibration attributes of single walled carbon nanotubes based on Galerkin's method have been investigated. The influence of power law index subjected to different end supports has been overtly examined. Application of the Hamilton's variational principal leads to the formation of partial differential equations. The effects of different physical and material parameters on the fundamental frequencies are investigated for armchair and zigzag carbon nanotubes with clamped-clamped, simply supported and clamped-free boundary conditions. By using volume fraction for power law index, the fundamental natural frequency spectra for two forms of Single-Walled Carbon Nanotubes (SWCNTs) are calculated. The influence of frequencies against length-to-diameter ratios with varying power law index are investigated in detail for these tubes. MATLAB software package has been utilized for extracting tube frequency spectra. The obtained results are confirmed by comparing with available literature.
Khadimallah, Mohamed A.,Safeer, Muhammad,Taj, Muhammad,Ayed, Hamdi,Hussain, Muzamal,Bouzgarrou, Souhail Mohamed,Mahmoud, S.R.,Ahmad, Manzoor,Tounsi, Abdelouahed Techno-Press 2020 Advances in concrete construction Vol.10 No.2
In the present study, a mechanical model is applied to account the effects of the surrounding viscoelastic media on the buckling behavior of single microfilament within the cell. The model immeasurably associates filament's bending rigidity, neighboring system elasticity, and cytosol viscosity with buckling wavelengths, buckling growth rates and buckling amplitudes of the filament. Cytoskeleton components in living cell bear large compressive force and are responsible in maintaining the cell shape. Actually these filaments are surrounded by viscoelastic media consisting of other filaments network and viscous cytosole within the cell. This surrounding, viscoelastic media affects the buckling behavior of these filaments when external force is applied on these filaments. The obtained results, indicate that the coupling of viscoelastic media with the viscous cytosol greatly affect the buckling behavior of microfilament. The buckling forces increased with the increase in the intensity of surrounding viscoelastic media.
The effects of ring and fraction laws: Vibration of rotating isotropic cylindrical shell
Khadimallah, Mohamed A.,Hussain, Muzamal,Elbahar, Mohamed,Ghandourah, E.,Elimame, Elaloui,Tounsi, Abdelouahed Techno-Press 2021 Advances in nano research Vol.11 No.1
This paper deals with the specific influence of three different fraction laws for vibrational analysis of rotating cylindrical shells. The rotating cylindrical shells are stabilized by ring-stiffeners to increase the stiffness and strength. Isotopic materials are the constituents of these rings. The frequencies are investigated versus circumferential wave number, length- and height-to- radius ratios using three volume fraction laws. Moreover, the effect of rotation speed is investigated. It is examined that the backward and forward frequencies increase and decrease on increasing the ratio of height- and length-to-radius ratio. When the position of ring supports increases, the backward and forward frequency first increases and obtains its maximum value at the shell mid length position and then decreases and get a bell shape with clamped-clamped and clamped-free conditions. The assessment of present model is judged with the comparison of non-rotating and rotating results with former exploration.
Continuous element method for aeroacoustics' waves in confined ducts
Khadimallah, Mohamed A.,Harbaoui, Imene,Casimir, Jean B.,Taieb, Lamjed H.,Hussain, Muzamal,Tounsi, Abdelouahed Techno-Press 2022 Advances in nano research Vol.13 No.4
The continuous elements method, also known as the dynamic stiffness method, is effective for solving structural dynamics problems, especially over a large frequency range. Before applying this method to fluid-structure interactions, it is advisable to check its validity for pure acoustics, without considering the different coupling parameters. This paper describes a procedure for taking wave propagation into account in the formulation of a Dynamic Stiffness Matrix. The procedure is presented in the context of the harmonic response of acoustic pressure. This development was validated by comparing the harmonic response calculations performed using the continuous element model with the analytical solution. In addition, this paper illustrates the application of this method to a simple compressible flow problem, since it has been applied solely to structural problems to date.
Effect of power law index for vibration of armchair and zigzag single walled carbon nanotubes
Mohamed Amine Khadimallah,Muzamal Hussain 국제구조공학회 2020 Steel and Composite Structures, An International J Vol.37 No.5
This research deals with the study of vibrational behavior of armchair and zigzag single-walled carbon nanotubes invoking extended Love shell theory. The effects of different physical and material parameters on the fundamental frequencies are investigated. By using volume fraction for power law index, the fundamental natural frequency spectra for two forms of single-walled carbon nanotubes are calculated. The influence of frequencies against length-to-diameter ratios with varying power law index are investigated in detail for these tubes. To discretize the governing equation in eigen-value form, wave propagation approach is developed. Complex exponential functions have been used and the axial model depends on boundary condition that has been described at the edges of carbon nanotubes to calculate the axial modal dependence. Computer software MATLAB is utilized for the frequencies of single-walled carbon nanotubes and current results shows a good stability with comparison of other studies.