Options
Shaikh Faruque Ali
Loading...
Preferred name
Shaikh Faruque Ali
Official Name
Shaikh Faruque Ali
Alternative Name
Faruque Ali, Shaikh
Ali, S. F.
Ali, S. Faruque
Ali, Shaikh Faruque
Main Affiliation
Email
ORCID
Scopus Author ID
Researcher ID
Google Scholar ID
26 results
Now showing 1 - 10 of 26
- PublicationOptimal Placement and Shape Morphing Of Thin Plates Using Dynamic Inversion Design(01-01-2018)
;Pradeesh, L. V.This paper presents active vibration control and morphing of thin plates using an array of piezoelectric actuator-sensor system whose locations are determined by optimization. The sudden application of control input for morphing leads to unwanted vibrations which are suppressed using the piezoelectric actuator-sensor couples, which form a feedback control loop. Dynamic Inversion technique is used to determine the control inputs to morph the plate and to suppress the vibrations in the process. The Dynamic Inversion controlled system is compared to uncontrolled system and as a reference, the results are compared with that of Linear Quadratic Controller. The partial differential equations governing the behaviour of plate and piezoelectric actuation are solved using lower dimensional projection method, following Design-then-Approximate (DTA) method, which will reduce spillover effects. Two reference configurations are considered to perform simulations. The actuators are designed for both vibration control and morphing since thin plates have poor damping characteristics and need external damping. The displacement, velocity and error norm time histories are analysed and the configuration achieved by the system by both controllers are compared. - PublicationNon-linear piezoelectric vibration energy harvesting from a vertical cantilever beam with tip mass(01-01-2013)
;Bilgen, Onur; ;Friswell, Michael I. ;Litak, GrzegorzDe Angelis, MarcAn inverted cantilevered beam vibration energy harvester with a tip mass is evaluated for its electromechanical efficiency and power output capacity in the presence of pure harmonic, pure random and various combinations of harmonic and random base excitation cases. The energy harvester employs a composite piezoelectric material device that is bonded near the root of the beam. The tip mass is used to introduce non-linearity to the system by inducing buckling in some configurations and avoiding it in others. The system dynamics include multiple solutions and jumps between the potential wells, and these are exploited in the harvesting device. This configuration exploits the non-linear properties of the system using base excitation in conjunction with the tip mass at the end of the beam. Such nonlinear device has the potential to work well when the input excitation does not have a dominant harmonic component at a fixed frequency. The paper presents an extensive experimental analysis, results and interesting conclusions derived directly from the experiments supported by numerical simulations. Copyright © 2013 by ASME. - PublicationDesign and conception of a trailing edge morphing wing concept with bistable composite skin(01-01-2020)
;Mukherjee, Aghna; ; Arockiarajan, A.In the recent past, bistable laminates have been widely studied for their potential in wing morphing applications. The existence of multiple stable states makes them extremely viable as structural elements. However, for successful deployment, these laminates must be integrated into a larger mechanism. For integration, the bistable laminates are required to be clamped to a larger structure without the loss of bistability. In this work, an attempt has been made to understand the effect of integration (i.e., using different structural constraints and clamping) on the bistability and the snapthrough performance of a special class of hybrid bistable symmetric laminates (HBSLs). The structural analysis has been carried out using FEA software ABAQUS. Subsequently, a conceptual design of a morphing wing is proposed based on the insights gained from the numerical analysis that uses two HBSLs as skin with a corrugated core. Finally, using the analysis guidelines, two HBSL skins and a circular corrugated core are manufactured and integrated to show the possibility of using such bistable laminates as skin. - PublicationTheoretical modeling of a 2D nano-energy harvester(01-01-2018)
;Somayajulu, D. ;Arockiarajan, A.Nano-piezoelectric energy harvesters, due to their ability to convert mechanical vibrations to electrical current, are apt candidates for self-powered NEMs devices. Further, these are strain based electrical potential generators and can be used in tactile devices for accurate position sensing. ZnO, due to its piezoelectric properties and semiconducting nature is the ideal candidate for such applications. This paper proposes an analytical model to explain the potentials generated due to ZnO nano-films on being subjected to different forms of static loading. The model also incorporates the effect of different boundary conditions imposed on the nano-film. A perturbation theory based approach has been used to generate the analytical model. Initially, the strains are calculated ignoring the piezoelectric effect. Later, the electromechanical coupling is taken into consideration and the potentials have been calculated as a second order effect. The finite element simulation results agree with the theory to an accuracy of 5%. The profiles for piezoelectric potential distribution agree also well with the simulations. These piezoelectric potential profiles can also be used in smart materials for obtaining the required deformation in a specimen by applying a similar electrical potential across it. - PublicationBase excited hybrid energy harvesting(01-01-2013)
;Karthik, K. S.; ;Adhikari, S.Friswell, M. I.This paper proposes a novel energy harvesting system model based on combined electromechanical and electromagnetic transduction technique. A cantilever substrate (beam) with piezoelectric (PZT) patch and a mass at the tip is considered for electromechanical transductions. A magnet is hanged through a spring at the tip of the composite beam over a printed circuit board. When the cantilever system is subjected to base excitations, the motion of the magnet relative to a conducting circuit placed near it generates electric energy in the circuit, while the strains induced in the PZT patch will also generate electric energy. In this paper a simplified two-degree of freedom lumped mass model is studied for the analysis of the proposed hybrid harvesting system for harmonic vibration input. Attempts are made to optimize the parameters of the model to get maximum net power generated by the system. © 2013 IEEE. - PublicationActive vibration control of thin plate using optimal dynamic inversion technique(01-01-2016)
;Pradeesh, L. VishnuGeometrically non-linear von Karman plate vibrations are suppressed using optimal dynamic inversion technique. Two types of controller are considered, a continuous and finite discrete controllers in spatial domain to control the vibrations of the plate. Non-linear Finite Element (FE) method is used to transform the non-linear partial differential equations (PDE) into a set of non-linear algebraic equations and are solved. The non-linear PDE is directly used for controller design i.e. design-then-approximate (DTA) method is followed which ensures the stability and controllability of the system. The simuation study shows the effectiveness of controlling plate vibrations using continuous and discrete controllers. - PublicationModeling of the snap-through of a hybrid bistable laminate by a magnetic force field(01-01-2021)
;Mukherjee, Aghna ;Sridhar, Sudersan; Arockiarajan, A.The traditional [0/90]T laminate has two stable equilibrium shapes, and it is possible to go from one shape to the other by means of an external force. In the past, researchers have attempted to obtain the snap-through between the two equilibrium states using smart actuators like shape memory alloy (SMA) wires and macro-fiber composite (MFC) patches. The integration of these actuators adds several complications. Moreover these smart actuators are generally attached to the surface of the laminate hence influencing the structural performance substantially. Recently, non contact magnetic actuation was experimentally demonstrated to be a viable method of reversible snap-through. A non-contact actuation using magnetic fields provides an elegant means of achieving reversible snapping without affecting the bistability characteristics of the laminate. In this work, a numerical model has been developed to aid the design of non-contact systems comprising of a ferromagnetic material actuated by a solenoid. The developed model uses a Rayleigh-Ritz based potential minimization to capture the magnetic snap-through of a hybrid [Fe/0/90/Fe]T laminate. The model accurately captures the bistability of the multi-sectioned hybrid layup and can be used for the design of coils to provide the necessary actuation currents. - PublicationOptimal distributed actuator design for control of beams(01-01-2022)
;Mohommad, DeenDistributed systems such as cables, beams, plates, etc., are widely used in many electro-mechanical devices. The efficiency of such devices largely depends on precise dynamics of the structural components, as in micro-electro-mechanical (MEMs) devices. Therefore, better sensing of the dynamics of such components and thereafter necessary actuation are the keys to increase precision of such devices. This work designs an optimal distributed actuator of a linear beam using its vibration modes. General boundary conditions are considered with a finite element frame work so that the transducer design is applicable for any vibrating beam. Piezoelectric composites are considered as actuators and the signal is considered proportional to the excited response of the targeted mode for optimization. Finally, the optimal shaped transducer is used to control an externally excited beam with cantilever boundary condition. The voltage inputs required to control shaped modal actuator is compared with a regular rectangular shaped piezoelectric actuator. Results are reported at the end. - PublicationStructural and Aerodynamics Studies on Various Wing Configurations for Morphing(01-01-2018)
; ; Arockiarajan, A.The current aircraft industry, specially unmanned aerial vehicles, is shifting from fixed wing vehicles to morphed wing. Morphing wings can create smoother aerodynamic surfaces, making an aircraft more agile and efficient than an aircraft that flies with many discrete moving surfaces. In present study, a double corrugated variable camber configuration of morphing wing with trailing edge morphing sections are proposed. The two configurations available from literature; one Fish Bone Active camber concept and other is variable camber morphing wing composed of single corrugated structure is considered for comparison of structural and aerodynamic analysis. The structural analysis of all prototype models is done using finite element analysis with actuation mechanism. Aerodynamic analysis is done using two methods; one analytical approach based on thin airfoil theory, and the other one is numerically using XFOIL, which couples a potential-flow panel method with viscous boundary-layer solver. A comparison is done on the basis of stress and deformation developed in various parts of the models. The results show that the double corrugated variable camber morphing configuration can take more structural load without harmful deformation. The aerodynamic analysis also shows that the aerodynamic efficiency of double corrugated variable camber morphing configuration is higher compared to other configurations. - PublicationEnergy harvesting from near periodic structures(01-01-2015)
;Malaji, P. V.In this research energy harvesting from near periodic structure is discussed. The near periodic system consists of two pendulums connected using a common linear spring. Mistuning in the simple coupled pendulum system is achieved by varying the length of one of the pendulums. Effect of this mistuning on amount of energy harvested is developed analytically and numerically. This will be discussed in this paper and at the same time effect of harvesting on mistuning will be presented. It is shown that with a proper electrical damping, optimal power can be obtained and effect of mistuning can be minimized. Same analysis is carried out with energy harvesting from both the pendulums. In case of harvesting from both the pendulums the harvesting bandwidth is increased and electrical damping required to minimize mistuning is more than that in case of harvesting with mistuned pendulum alone.
- «
- 1 (current)
- 2
- 3
- »