Investigation of critical influential speed for moving mass problems on beams

Dehestani, Mehdi; Mofid, Massood; Vafai, A.

doi:10.1016/j.apm.2009.01.003

Cited by 65 publications

(26 citation statements)

References 18 publications

(24 reference statements)

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“…In this paper, the problem de nition is supplied and afterwards an algorithm to solve the governing equation of actual European truck moving on di erent bridges considering viscoelastic supports is presented. The present work extends the scope of previous studies by considering actual truck moving instead of moving mass problem, [8,9], and by considering viscoelastic supports for the beam loading, [10,17,18]. The critical velocities considering viscoelastic supports to get maximum dynamic stresses of the beam are numerically calculated.…”

Section: Introductionmentioning

confidence: 48%

“…Other papers have been written considering acceleration of moving mass, friction between moving mass and bridge [4], cantilever beams [5], large free vibrations [6], and curved beams [7]. Dehestani et al [8] investigated critical in uential speed for moving mass problems on the beams with di erent end conditions. In other research, Mo d et al [9] presented two methods to determine the dynamic behavior of viscoelastic beams subjected to moving mass.…”

Section: Introductionmentioning

confidence: 99%

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Effects of viscoelastic supports on the behavior of bridges under moving vehicles

Samanipour

Vafai

2017

Scientia Iranica

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Abstract. One of the most important problems facing structural engineers is the analysis of dynamic behavior of bridges subjected to moving vehicles. In addition, viscoelastic supports under bridges change their dynamic behavior under passing tra c loads. This paper presents how to model a bridge with viscoelastic supports and how the maximum dynamic stress of bridges changes during the passing of moving vehicles. Furthermore, this paper presents an algorithm to solve the governing equation of the bridge with viscoelastic supports as well as the equation of motion of a real European truck with di erent speeds, simultaneously. Using viscoelastic supports with appropriate characteristics can make a signi cant di erence in the magnitude on the maximum dynamic stress of bridges. By nite di erence method, it will be shown that how much the sti ness and damping of viscoelastic supports should be to have less impact and dynamic stresses in the bridges. It will be demonstrated that using viscoelastic supports can decrease the local maximum DAFs in the case of short and medium spans up to 5%. This study becomes more important where vehicle speeds are considerably high; therefore, the consequences of a full-length analysis with viscoelastic supports must be used to design safe bridges.

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Section: Introductionmentioning

confidence: 48%

Section: Introductionmentioning

confidence: 99%

Effects of viscoelastic supports on the behavior of bridges under moving vehicles

Samanipour

Vafai

2017

Scientia Iranica

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“…The effects of moving loads on the dynamics of the structures have been widely studied in literature, for example, (Dehestani et al, 2009;Lee, 1996;Michaltsos, 2002;Niaz and Nikkhoo, 2015;Omolofe and Oni, 2015;Wang, 2009) have investigated the subject. For the application to the bridge engineering (Michaltsos et al, 1996) have studied the effect of accelerating vehicles on the bridge beams, considering highway bridges and high speed rail road construction.…”

Section: Introductionmentioning

confidence: 99%

Tip Deflection Determination of a Barrel for the Effect of an Accelerating Projectile Before Firing Using Finite Element and Artificial Neural Network Combined Algorithm

Koç

Esen

Çay

2016

Lat. Am. j. solids struct.

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For realistic applications, design and control engineers have limited modelling options in dealing with some vibration problems that hold many nonlinearity such as non-uniform geometry, variable velocity loadings, indefinite damping cases, etc. For these reasons numerous time consuming experimental studies at high costs must be done for determining the actual behaviour such nonlinear systems. However, using advantages of multiple computational methods like Finite Element Method (FEM) together with an Artificial Intelligence (ANN), many complicated engineering problems can be handled and solved to some extent. This study, proposes a new collective method to deal with the nonlinear vibrations of the barrels in order to fulfil accurate shooting expectancy. Using known analytical methods, in practical, to determine dynamic behaviour of the barrel beam is not possible for all conditions of firing that include numerous varieties of ammunition for different purposes, and each projectile of different ammunition has different mass and exit velocity. In order to cover all cases this study proposes a new method that combines a precise FEM with ANN, and can be used for determining the exact dynamic behaviour of a barrel for some cases and then for precisely predicting the behaviour for all other possible cases of firing. In this study, the whole nonlinear behaviour of an antiaircraft barrel were obtained with 3.5% accuracy errors by ANN trained by FEM using calculated analysis results of ammunitions for a particular range. The proposed FEM-ANN combined method can be very useful for design and control engineers in design and control of barrels in order to compensate the effect of nonlinear vibrations of a barrel for achieving a higher shooting accuracy; and can reduce high-cost experimental works.

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“…The effect of a variable velocity load on structures is also significant, and some researchers (Lee, 1996b;Michaltsos, 2002;Wang, 2009;Dyniewicz and Bajer, 2012) have studied the dynamic behaviour of beams under accelerated masses. Inertia effects of the moving mass continue to be a point of interest for bridge dynamics, railroad design and other high-velocity delicate motion processes and some others (Michaltsos et al, 1996;Michaltsos and Kounadis, 2001;Dehestani et al, 2009) have studied the inertial effects of moving masses. The importance of computerized solution of moving mass problems has increased via the usage of computers, and the study (Bulut and Kelesoglu, 2010) has compared numerical methods for response of beams, and another one (Nikkhoo et al, 2007) has studied the modal control of beams under the effect of a travelling mass.…”

Section: Introductionmentioning

confidence: 99%

Dynamic response of a 120 mm smoothbore tank barrel during horizontal and inclined firing positions

Esen

Koç

2015

Lat. Am. j. solids struct.

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In this study, the dynamic interaction between a 120 mm smoothbore tank barrel modeled as an Euler-Bernoulli cantilever beam and an accelerating projectile during firing is presented. The interaction was modelled using a new FEM approach that took into account the projectile's inertia, Coriolis, and centripetal forces and the horizontal and inclined positions of the barrel. The mass, exit velocity and acceleration effects of the projectile on the dynamics of the barrel were investigated. The effects of the projectile's inertia, and Coriolis and centripetal forces were evaluated as well. Furthermore, the tip displacements at different firing angles were determined by transferring the mass, stiffness and damping matrices of the barrel with the addition of the instantaneous property matrices of the projectile from a local coordinate to the global Cartesian coordinate with the aid of transformation matrices. Finally, the barrel vibrations caused by the successive firings were evaluated under different firing scenarios. To demonstrate the validity of the current study, comparisons were made with the results of previous studies and a good agreement was achieved. By using the method recommended in this study, it is possible to determine the accurate dynamic behavior of any barrel with sufficient sensitivity, without any costly or time-consuming tests being necessary.

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Investigation of critical influential speed for moving mass problems on beams

Cited by 65 publications

References 18 publications

Effects of viscoelastic supports on the behavior of bridges under moving vehicles

Effects of viscoelastic supports on the behavior of bridges under moving vehicles

Tip Deflection Determination of a Barrel for the Effect of an Accelerating Projectile Before Firing Using Finite Element and Artificial Neural Network Combined Algorithm

Dynamic response of a 120 mm smoothbore tank barrel during horizontal and inclined firing positions

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