List of Articles Dynamic Response

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  1 - Dynamic Response of FGM Plates Under Blast Load
  reza azarafza puya pirali Ali Davar majid ghadimi
  10.30486/admt.2021.1920150.1239
  The present study investigates the deformation of FGM plates under blast load. Hamilton's principle is used to obtain the dynamic Equations. The two constituent phases, ceramic and metal, vary across the wall thickness according to a prescribed power law. Boundary condi More

  The present study investigates the deformation of FGM plates under blast load. Hamilton's principle is used to obtain the dynamic Equations. The two constituent phases, ceramic and metal, vary across the wall thickness according to a prescribed power law. Boundary conditions are assumed to be Simply Supported (SS). The type of explosive loading considered is a free in-air spherical air burst and creates a spherical shock wave that travels radially outward in all directions. For the pressure time of the explosion loading, Friedlander’s exponential relation has been used. In order to determine the response analytically, the stress potential field function is considered. Using the Galerkin method, the final Equations are obtained as nonlinear and nonhomogeneous second-order differential Equations. The effect of temperature including thermal stress resultants and different parameters on the dynamic response have been investigated. Results have been compared with references and validated. Results showed that the amplitude of the center point deflection of the FGM plate is less than the pure metal plates when exposed to blast load, by increasing the volumetric index percentage of FGM, center point deflection is increased and in the FGM plates, deformation of symmetrical plates is smaller than the asymmetric plates. Also by applying the damping coefficient of the FGM plates, the amplitude of center point deflection is reduced, and by increasing the aspect ratio of the FGM plate, its center point deflection against explosion waves is reduced and by considering the effects of thermal resultant forces and moments, center point deflection is increased. Manuscript profile
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  2 - Refined Zigzag Theory for Nonlinear Dynamic Response of an Axially Moving Sandwich Nanobeam Embedded on Visco-Pasternak Medium Using MCST
  A Ghorbanpour Arani M Abdollahian
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  3 - Dynamic Response of an Axially Moving Viscoelastic Timoshenko Beam
  H Seddighi H.R Eipakchi
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  4 - Size-Dependent Analysis of Orthotropic Mindlin Nanoplate on Orthotropic Visco-Pasternak Substrate with Consideration of Structural Damping
  A Ghorbanpour Arani M.H Jalaei S Niknejad A.A Ghorbanpour Arani
  10.22034/jsm.2019.665162
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  5 - Improved Dynamic Response and Speed Control of Electric Drives Using Fuzzy Logic Controllers
  Amir Rikhtegar Giasi Elham Balaie Hadi Lotfi
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  6 - Influence of the Isolator Characteristics on the Response of the Isolated Buildings in the Near-FaultEarthquakes
  Beytollah Taromi Kiarash Nasserasadi Asghar Vatani Oskouei
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  7 - Analysis and Design a Step-Up DC-DC Converter with Fast Dynamic Response Without the Right Half Plan Zero
  Mohammad Javad Kargaran Mahdi Shaneh Tohid Nouri
  By increasing use of new energy to reduce the negative effects of burning fossil fuels to supply electricity, the need for power electronic converters have become very important. Due to sudden changes in load or input voltage level, the converter used as a voltage regul More

  By increasing use of new energy to reduce the negative effects of burning fossil fuels to supply electricity, the need for power electronic converters have become very important. Due to sudden changes in load or input voltage level, the converter used as a voltage regulator in a certain range of output voltage changes should quickly return to its reference value, which should analyze the dynamic behavior of these converters and the speed of its dynamic response to any interference is discussed. Because the initial boost converter has a delay in its transfer function due to the right half plane zero, it is possible to use structures to eliminate this delay. The use of coupled inductor in non-insulated structures is one of the structures that can be repaired in this field, which in addition to removing right half plan zero of the transfer function, increases voltage gain, reduces voltage stress on circuit semiconductors. In this paper, a new coupled inductor structure is proposed to remove the right half plan zero. The new structure will be accompanied by an increase in gain, but the voltage stress on the switch is limited, and on the other hand, due to the position of the coupled inductor, the input current for this structure will be minimized. Manuscript profile
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  8 - Dynamic Response of Bridges to Near and Far Fault, Forward Directivity Ground Motions
  mohammad hajali abdolrahim jalali ahmad maleki
  In this study, we assessed the performance of a concrete bridge under the dynamic strain of an earthquake in the near and far domain of earth’s faults. With respect to available data and showing the effects of key factors and variables, we have examined the bridge More

  In this study, we assessed the performance of a concrete bridge under the dynamic strain of an earthquake in the near and far domain of earth’s faults. With respect to available data and showing the effects of key factors and variables, we have examined the bridge’s performance. The modelling of a double span bridge has been done in CSI Bridge software and has been compared and examined to assess the capability of a bridge under the strain of a close-to-fault-line earthquake and a far-from-fault-line earthquake. Timeline interpretation was done on the resulting models and from 7 records from the past earthquakes and it was observed that the close to fault line earthquakes caused much bigger displacements when compared to far from fault line earthquakes. Bridges which are separated by a quake separator, have an acceptable response to far from fault line earthquakes. This means that by disassembling these bridges, the acceleration rate on the deck, the cut of the base, as well as the relative displacement of the deck relative to the undivided bridge, is reduced. This issue is not reflected in the response of the bridges to faults near earthquakes. By investigating the record of near-earthquakes, it was observed that these earthquakes produced large displacements to earthquakes that are far from faults, which could make the isolation system more critical, so, to avoid this event, it FDGM should be used to reform the response these bridges have to the earthquake. Based on these results, it can be stated that the displacements near the fault and with the effect of progressive movement will be greater than the distances from the fault, so that for the ratio of different distances from the fault, the lower this ratio is, the maximum displacement of the bridge and the maximum cutting force will also be greater. Manuscript profile
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  9 - Investigation of the dynamic response of the subsea transmission pipeline under explosion impact using experimental and numerical methods
  Hamid nasiri mohammad asadian ghahferokhi Madjid Ghodsi Hassanabad amin bahmanpour
  10.30495/civil.2022.694460
  Sea and high seas are very important, which can be considered in two aspects. On the one hand, the seas have economic, commercial, logistical, military, and geopolitical advantages, in addition, they pave the way for increased maritime diplomacy. In addition to these ad More

  Sea and high seas are very important, which can be considered in two aspects. On the one hand, the seas have economic, commercial, logistical, military, and geopolitical advantages, in addition, they pave the way for increased maritime diplomacy. In addition to these advantages, the harsh natural conditions at sea, such as the presence of high waves, tsunamis, sea ice, as well as ammunition and unused military equipment buried under water left over from the First and Second World Wars, also from the imposed war, which could impose a lot of potential human and financial risks due to explosions. In this paper, using the Abaqus finite element software, the dynamic response of a cylindrical tube buried in the sea subjected to the explosion is investigated applying numerical and experimental methods. Finite element models based on the experimental models were examined and the numerical results were compared with the experimental data. The results indicated that the maximum impact wave pressure, bubble propagation duration and displacement due to the cylinder deformation in the experimental and finite element analysis were well compatible Manuscript profile