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SN Applied Sciences

, 2:134 | Cite as

Gas pressure and density effects on vibration of cylindrical pressure vessels: analytical, numerical and experimental analysis

  • Omid Mir
  • Meisam ShakouriEmail author
  • M. R. Ashory
Research Article
  • 177 Downloads
Part of the following topical collections:
  1. Engineering: Applied Mechanics and Materials Engineering (AMME)

Abstract

The present research deals with the natural frequencies and mode shapes of cylindrical pressure vessels filled with different gasses in various internal pressures. The Hamilton’s principle is employed to derive the governing equations, which are solved using analytical and finite element analyses, and a closed form relation as the equivalent density is obtained to include the gas properties. The experimental modal analysis is performed and the obtained results are compared and validated with analytical and finite element results. The results show that the type of the gas, as well as the gas pressure have significant effect on vibrational behavior of the structure and should be accounted in the design and analysis of vessels.

Keywords

Free vibration Modal testing Pressure vessel 

1 Introduction

Pressure vessels have many applications in different areas of engineering like mechanical, aerospace, marine, etc. Since the pressure vessels should work with various gas types and pressures during the working life, the effects of gas properties on the operation of the vessel should be considered in the design process.

Many researchers previously studied the vibration characteristics of cylindrical pressure vessels with internal and external pressure [1, 2, 3, 4, 5, 6]. Li et al. [7] analyzed the effects of hydrostatic pressure on the vibration of piezoelectric laminated cylindrical shell. Senjanović et al. [8, 9, 10] studied the effects of internal pressure on vibrational behavior of rotating cylindrical shell. Arnold and Warburton [11, 12] employed Hamilton’s principle to derive equations of motion of the cylindrical shell. Amabili et al. [13] investigated the vibration of simply supported cylindrical shell containing an incompressible fluid using Donnell shallow shell theory. Fluid-filled cylindrical shell subjected to lateral harmonic loading is studied by Del Prado et al. [14]. In addition, Zhang et al. [15] considered vibration of composite cylindrical shells subjected to axial pressure and radial load in both side of the cylinder. Bolotin [16] focused on the natural frequency distribution and the intervals in cylindrical shells and Fung et al. [17] examined the effects of shell thickness and internal pressure on the vibration of cylinders. Analytical and experimental study is done by Stillman [18] to describe the vibration behavior of liquid-filled pressure vessels. Selmane and Lakis [19] presented the vibration of anisotropic cylindrical shell subjected to internal and external flow using Sanders shell theory. The generalized Fourier series are used by Stepanishen [20] to evaluate fluid pressure effect on vibratory response of cylindrical shells with infinite rigid extensions. Chiba and Abe [21] analyzed hydroelastic vibration of cylindrical vessel containing liquid and Gupta and Hutchinson [22] studied the free vibration of liquid storage tanks. Krishna and Ganesan [23] introduced an approach based on polynomial terms for calculating the added mass for fluid-filled cylindrical shells. The vibration of partially filled laminated composite cylindrical shells is studied in ref [24]. Isvandzibaei et al. [25] studied the effects of internal pressure in cylindrical shells made of functionally graded materials (FGMs) using first order shear deformation theory. Shakouri et al. [26] studied the Effects of imperfection shapes on buckling of conical shells under compression.

According to the above papers, many of previous investigations of cylindrical shell vibrations have been limited to unpressurized vessels. In addition, in the case of pressurized vessels, the pressure is applied as the internal loading on the shell and the effects of the gas properties on the vibration of the pressure vessel are not considered.

In this paper, the natural frequencies and mode shapes of pressurized cylinders containing various types of the gasses (air and oxygen) with internal pressures ranges from zero to 100 bar is investigated. The total kinematic energy of the cylinder and internal gasses has been written and the governing equation is obtained using Hamilton’s equation and the relation for natural frequencies of the pressure vessel including gas effects is obtained. The results are compared and validated with finite element analysis and modal testing. Finally, the effects of mass and pressure of the gas on the frequency response function of the pressurized cylinder is studied.

2 Governing equations for pressure vessel containing gas

2.1 Displacements and strains

Figure 1 illustrates the cylindrical pressure vessel considered in this paper. The (\(r,\theta ,z\)) represent the cylinder in radial, circumferential and longitudinal directions, respectively. It is assumed that the cylinder remains circular in all internal pressures. Thus, the displacements of the shell can be shown as [27]:
Fig. 1

Schematic of cylindrical pressure vessel

$$\begin{aligned} & \delta r = A\cos \left( {\beta \theta } \right)\sin \left( {\frac{\alpha \pi z}{L}} \right) \\ & \delta \theta = \delta z = 0 \\ \end{aligned}$$
(1)
where \(\delta r,\delta \theta ,\delta z\) denotes radial, circumferential and axial displacement, L represents length, r is the radius, t is the thickness and \(A\) is the amplitude of radial displacement which is periodic over time.
$$A = A_{0} \sin \omega t$$
(2)

In addition, \(\alpha ,\beta\) are axial half wave and circumferential wave, respectively.

2.2 Governing equations

To extract the governing equation, bending and stretching energies are written for pressurized cylindrical shell. Fluid expansion energy is represented for indicating fluid effect. Tensile tension in cylindrical shell due to internal gas pressure is \(\frac{pr}{2}\) and \(pr\) in the axial and circumferential directions, respectively. For deformation of the middle surface in \(\theta\) direction we have [27]
$$\Delta \theta = \mathop \int \limits_{0}^{2\pi } \left( {\sqrt {r^{2} + 2\delta r.r + \delta r^{2} + \left( {\frac{\partial \delta r}{\partial \theta }} \right)^{2} } - r} \right)d\theta$$
(3)
where Δθ denotes the circumferential expansion of the cylinder. Considering small displacements (i.e. δr/r ≪ 1,\(\partial \delta r/r\partial \theta \ll 1\)), the Eq. (3) can be written as
$$\Delta \theta = \mathop \int \limits_{0}^{2\pi } \left( {\sqrt {\delta r + \frac{1}{2r}\left( {\frac{\partial \delta r}{\partial \theta }} \right)^{2} } - r} \right)d\theta$$
(4)
$$\Delta z = \frac{1}{2}\mathop \int \limits_{0}^{2\pi } \left( {\frac{\partial \delta r}{\partial z}} \right)^{2} dz$$
(5)
where Δz is the axial expansion of the cylindrical shell. The stretching energy (VS) of the cylinder can be written as [27]
$$V_{s} = \mathop \int \limits_{0}^{2\pi } \mathop \int \limits_{0}^{x} p\left[ {\delta r + \frac{1}{2r}\left( {\frac{\partial \delta r}{\partial \theta }} \right)^{2} } \right]rd\theta dz + \frac{1}{4}\mathop \int \limits_{0}^{2\pi } \mathop \int \limits_{0}^{x} pr^{2} \left( {\frac{\partial \delta r}{\partial z}} \right)^{2} d\theta dz$$
(6)
where p is internal pressure of the cylinder. In addition, the gas expansion energy (VE) is
$$V_{E} = - \mathop \int \limits_{0}^{2\pi } \mathop \int \limits_{0}^{x} pr\delta rd\theta dz$$
(7)
Combining Eqs. (6) and (7) results in
$$V_{S} + V_{E} = \frac{1}{2}\mathop \int \limits_{0}^{2\pi } \mathop \int \limits_{0}^{x} \frac{p}{r}\left[\left( {\frac{\partial \delta r}{\partial \theta }} \right)^{2} + \frac{{r^{2} }}{2}\left( {\frac{\partial \delta r}{\partial z}} \right)^{2} \right]rd\theta dz$$
(8)
$$V_{S} + V_{E} = \frac{1}{4}\left[ {\pi px\left( {A\beta } \right)^{2} \left( {1 + \frac{{\lambda^{2} }}{{\beta^{2} }}} \right)} \right]$$
(9)
$$\lambda = \frac{\pi r\alpha }{x}$$
(10)
The bending energy (VB) of cylinder can be defined as
$$V_{B} = \mathop \int \limits_{0}^{2\pi } \mathop \int \limits_{0}^{x} \mathop \int \limits_{{{\raise0.7ex\hbox{${ - t}$} \!\mathord{\left/ {\vphantom {{ - t} 2}}\right.\kern-0pt} \!\lower0.7ex\hbox{$2$}}}}^{{{\raise0.7ex\hbox{$t$} \!\mathord{\left/ {\vphantom {t 2}}\right.\kern-0pt} \!\lower0.7ex\hbox{$2$}}}} \frac{Er}{{2\left( {1 - \nu^{2} } \right)}}\left[ {\varepsilon_{z}^{2} + \varepsilon_{\theta }^{2} + 2\nu \varepsilon_{z} \varepsilon_{\theta } + \left( {1 - \frac{\nu }{2}} \right)\tau_{\theta z}^{2} } \right]d\theta dzdx$$
(11)
where E is young modulus and ν is the Poisson’s ratio. In addition, ɛrɛθɛz represent the strains in radial, circumferential and axial directions, respectively and τθz is the shear strain. According to [28], by thin shell assumption for the cylinder, the values of normal stress in radial direction and the shear strain can be ignored. Therefore, we have
$$\varepsilon_{z} = - \mu \left( {\frac{{\partial^{2} \delta r}}{{\partial^{2} z}}} \right) = \left( {\frac{\alpha \pi }{x}} \right)^{2} A\mu \cos \left( {\beta \theta } \right)\sin \left( {\frac{\alpha \pi z}{x}} \right)$$
(12)
$$\varepsilon_{\theta } = - \mu \left( {\frac{{\partial^{2} \delta r}}{{\partial^{2} \theta }}} \right) = \left( {\frac{\beta }{r}} \right)^{2} A\mu \cos \left( {\beta \theta } \right)\sin \left( {\frac{\alpha \pi z}{x}} \right)$$
(13)
Substituting Eqs. (12) and (13) into (11), the potential bending energy of cylinder can be expressed as
$$V_{B} = \frac{{\pi xEA^{2} t^{3} \left( {\lambda^{2} + \beta^{2} } \right)^{2} }}{{48r^{3} \left( {1 - \nu^{2} } \right)}}$$
(14)
The kinetic energy of the cylinder is considered as
$$T_{C} = \frac{1}{2}\mathop \int \limits_{0}^{2\pi } \mathop \int \limits_{0}^{x} \mathop \int \limits_{{r - {\raise0.7ex\hbox{$t$} \!\mathord{\left/ {\vphantom {t 2}}\right.\kern-0pt} \!\lower0.7ex\hbox{$2$}}}}^{{r + {\raise0.7ex\hbox{$t$} \!\mathord{\left/ {\vphantom {t 2}}\right.\kern-0pt} \!\lower0.7ex\hbox{$2$}}}} \rho_{C} r\left( {\frac{\partial \delta r}{\partial T}} \right)^{2} d\theta dz dr = \frac{1}{4}\pi rxt\rho_{C} \dot{A}^{2}$$
(15)
where \(T_{C}\) and ρC respectively denote the kinetic energy and density of the cylinder. The gas in the cylinder is assumed incompressible and non-rotating, only with small pressure variations. According to these assumptions, for kinetic energy of the pressurized gas, we have
$$T_{G} = \frac{1}{2}\rho_{G} \mathop \int \limits_{0}^{x} \mathop \int \limits_{0}^{2\pi } rV_{G} \frac{{\partial V_{G} }}{\partial H}d\theta dz$$
(16)
where TG represents the kinetic energy of gas, ρG represents the density of gas, VG is the velocity potential and H is the unit vector, normal to the cylinder surface. For small displacements we have
$$\frac{{\partial V_{G} }}{\partial H} \approx \frac{{\partial V_{G} }}{\partial r}$$
(17)
$$t \ll r$$
(18)
$$T_{G} = \frac{1}{2}\rho_{G} \mathop \int \limits_{0}^{x} \mathop \int \limits_{0}^{2\pi } rV_{G} \frac{{\partial V_{G} }}{\partial r}d\theta dz$$
(19)
To satisfy the Hamilton’s principle, the velocity potential can be assumed as
$$V_{G} = - \frac{{x\dot{A}I_{n} \left( {\frac{\alpha \pi r}{x}} \right)}}{{\pi \alpha I_{n}^{'} \left( {\frac{\alpha \pi r}{x}} \right)}}\sin \left( {\frac{\alpha \pi z}{x}} \right)\cos \left( {\beta \theta } \right)$$
(20)
$$- \frac{{\partial V_{G} }}{\partial r}\left( {r,\theta ,z} \right) = \dot{A}\sin \left( {\frac{\alpha \pi z}{x}} \right)\cos \left( {\beta \theta } \right)$$
(21)
where In is the modified Bessel function. By substituting Eq. (20) into (19), the kinetic energy of the gas can be expressed as
$$T_{G} = \frac{{\pi \rho_{G} \dot{A}^{2} x^{3} I_{n} \left( {\frac{\alpha \pi r}{x}} \right)}}{{4\alpha \pi I_{n}^{'} \left( {\frac{\alpha \pi r}{x}} \right)}}$$
(22)
where the expressions of Modified Bessel function can be explained as [29]
$$I_{n}^{\prime} \left( y \right) = I_{n - 1} \left( y \right) - \frac{n}{z}I_{n} \left( y \right)$$
(23)
$$I_{n} \left( y \right) = \frac{{\left( {\frac{y}{2}} \right)^{n} }}{{\varGamma \left( {n + 1} \right)}}$$
(24)
where n and y are general parameters and Γ denote the gamma function. According to Eqs. (23)–(24) and (22), the potential energy of gas can be obtained as
$$T_{G} = \frac{{\pi rx^{2} \rho_{G} \dot{A}^{2} }}{4n}$$
(25)
Therefore, the total kinetic energy of system is obtained as
$$T_{T} = T_{C} + T_{G} = \frac{1}{4}\pi rxt\rho_{E} \dot{A}^{2}$$
(26)
Where TT denotes total kinetic energy, ρE is an equivalent density as follows
$$\rho_{E} \equiv \rho_{C} + \frac{{r\rho_{G} }}{nt}$$
(27)
Using Eq. (14) and (9) the total potential energy of the system can be written as
$$V_{T} = \frac{{\pi xA\left[ {Et^{3} \left( {\lambda^{2} + \beta^{2} } \right)^{2} + 12pr^{3} \left( {\beta^{2} + \lambda^{2} - \nu^{2} \left( {\beta^{2} + \lambda^{2} } \right)} \right)} \right]}}{{48\left( {1 - \nu^{2} } \right)r^{3} }}$$
(28)
which VT represents the total potential energy. Considering the Lagrange equation for investigating natural frequencies [30]
$$\frac{d}{dt}\left( {\frac{{\partial T_{T} }}{{\partial \dot{q}}}} \right) - \frac{{\partial T_{T} }}{\partial q} = - \frac{{\partial V_{T} }}{\partial q}$$
(29)
The natural frequency of cylinder can be expressed as
$$\omega = \omega_{0} \sqrt {\frac{{\rho_{C} }}{{\rho_{E} }} + \frac{{12pr^{3} \left( {1 - \nu^{2} } \right)}}{{Et^{3} \left( {\lambda^{2} + \beta^{2} } \right)}}}$$
(30)
where ω represents natural frequency of pressurized cylindrical shell and ω0 is the natural frequency of the cylinder, without considering the gas effects.

3 Experimental study

To validate the accuracy of Eq. (30), the pressurized cylinder made of steel is tested in modal laboratory. Material and geometrical properties of the pressure vessel are presented in Table 1. Figure 2 shows the test equipment and pressure vessel in modal lab.
Table 1

Measured geometry and material properties of pressure vessel

Material

 

Geometry

 

Density

7850 (kg/m3)

L

41.5 cm

Elastic modulus

207,000 (MPa)

r

7 cm

Poisson’s ratio

0.286

t

4.7 mm

Shear modulus

80,482 (MPa)

  

Mass of cylinder

9.48 (kg)

  
Fig. 2

Test equipment’s and cylinder in modal lab

Oxygen and air gasses are filled separately into the cylinder. These gasses have different molar mass, which cause their densities to be different. Table 2 shows molar mass of oxygen and air.
Table 2

Molar mass of oxygen and air

Gas type

Molar mass

Oxygen

31.998 (\(\frac{{\text{gr}}}{{\text{mol}}}\))

Air

28.966 (\(\frac{{\text{gr}}}{{\text{mol}}}\))

3.1 Supports

The cylinder is free in both sides and the first six frequencies belongs to the rigid body motions (i.e. the frequency is zero). To obtain the free boundary condition, the pressure vessel is hanged with a long rope, so that the frequencies implemented from the boundary conditions are far from the vessel frequencies [31].

3.2 Excitation and accelerometers

The 4-input channel analyzer is used and the motion is detected and measured by using piezoelectric accelerometer. Number of points which be created in cylinder for modal testing is 49 points and the roving hammer method is used to excite the cylinder. Each frequency response function (FRF) is evaluated after averaging over several measurements (three times) in order to reduce noise.

4 Finite element analysis

For finite element (FE) analysis, the traditional ANSYS software is used and the 4-node SHELL181 element is employed to model the vessel. The Lanczos method is employed to obtain the natural frequencies and mode shapes. The pressure is applied as internal distributed load on the shell and the effects of the gas mass is modeled by using the equivalent density as presented in Eq. (27). After the mesh study and convergence check, the total number of mesh elements in cylindrical shell is 55376, which is the optimum conditions between solution time and the accuracy of the results.

5 Results and discussion

In this section, numerical, analytical and experimental results are presented and compared for the vibration of pressurized vessel. The pressure changes from zero to 100 bars and two types of gasses including oxygen and air are used. Effect of gas pressure on cylinder shell in the simulation is assumed steady. Tables 3 and 4 represent the first frequencies (excluding rigid body frequencies) of the system for air and oxygen, respectively. These frequencies are related to pressure and gas, which are calculated, by experiment, FE and analytical methods. In addition, the frequencies of pressurized vessels without considering the gas density effects is investigated. It can be seen that the results of Eq. (30) are in good accordance with finite element and experiment. In addition, the gas density has significant effect on the natural frequency, where the obtained results without gas density are far from the experiment results.
Table 3

Comparison of natural frequencies of cylinder which filled by air in various pressures

Cylinder filled with air

Pressure (Bar)

Experiment (Hz)

FE with mass effect (Hz)

FE without mass effect (Hz)

Equation (30) (Hz)

0

1136.9

1135.5

1135.5

1135.9

10

1146.4

1143.0

1153.3

1140.4

20

1150.0

1146.8

1162.7

1144.9

30

1154.1

1150.5

1171.4

1149.4

40

1158.5

1153.2

1180.5

1154.0

50

1161.8

1156.1

1186.2

1158.5

60

1169.6

1162.6

1200.0

1163.0

70

1171.6

1163.8

1205.6

1167.6

80

1177.5

1164.6

1216.4

1172.1

90

1180.8

1165.5

1223.3

1176.6

100

1186.6

1169.8

1232.9

1181.2

Table 4

Comparison of natural frequencies of cylinder which filled by oxygen in various pressures

Cylinder filled with oxygen (Hz)

Pressure (Bar)

Experiment (Hz)

FE with mass effect (Hz)

FE without mass effect (Hz)

Equation (30) (Hz)

0

1136.9

1135.5

1135.5

1135.9

10

1144.3

1138.6

1153.3

1139.0

20

1145.8

1140.1

1162.7

1142.2

30

1149.6

1141.8

1171.4

1145.3

40

1152.7

1143.5

1180.5

1148.5

50

1155.7

1146.5

1186.2

1151.6

60

1160.3

1152.3

1200.0

1154.8

70

1163.1

1153.9

1205.6

1157.9

80

1166.8

1156.3

1216.4

1161.4

90

1170.3

1158.6

1223.3

1164.2

100

1173.5

1160.6

1232.9

1167.4

As the Tables 3 and 4 show, the density of the gas can change the value of frequencies, so in order to obtain exact frequency values of the pressurized vessel, the type of the gas must be denoted. Figure 3 shows the frequency response function as well as the phase angle of the pressurized cylinder with different pressures for both air and oxygen. As can be seen, except the third natural frequency, the natural frequencies of system increase with increase in the pressure. The remarkable phenomena, which is observed in both air and oxygen gasses, is that the third natural frequency decreases with increase in the internal pressure.
Fig. 3

Frequency response function of cylinder for 0, 50, and 100 bar inlet pressure

Figure 4 shows the frequency response function and corresponding phase angles of the pressurized cylinder filled with oxygen and air in the same pressure. This figure apparently describes the effects of gas density on the natural frequencies of the pressure vessel. As can be seen, since the stiffness of the vessel is the same for both gasses, it is expected that the air with less mass density has the higher natural frequency.
Fig. 4

Compare Frequency response function of cylinder filled with air and oxygen in 100 bar inlet pressure

Results of Fig. 4 explain that density of gas can change natural frequencies and if type of gas is ignored in FE simulation, the results are different from the experiment. Figure 5 represents the variation of the frequency with respect to pressure, obtained from the experiment and corresponding linear fit (regression) between frequency and pressure. The linear function for both gasses are
Fig. 5

Compare frequencies regression in various bar inlet pressure

$$\begin{aligned} & \omega = 0.468p + 1139.677\quad \left( {\text{Air}} \right) \\ & \omega = 0.35p + 1138.791\quad \left( {\text{Oxygen}} \right) \\ \end{aligned}$$
(31)

It can be seen that each gas causes different slope in frequency-pressure relation.

The first three mode shapes extracted from FE analysis and modal test are compared in Fig. 6. As can be seen the obtained mode shapes are in good accordance with the numerical results.
Fig. 6

Three mode shapes of cylinder extracted from FEM and modal testing

To ensure from the independency of the mode shapes from each other, the auto-MAC study of the mode shapes are plotted Fig. 7. As seen, the mode shapes are independent from each other and none of them has significant effect on the others.
Fig. 7

Auto MAC for five mode shapes of cylinder extracted from modal testing

6 Conclusions

In this paper, the natural frequencies and mode shapes of pressurized cylinder considering the effects of pressure and the kind of the gas are studied. The modal analysis is done for two gasses (air and oxygen) in order to measure the effects of gas density on dynamic parameters of pressure vessel. The governing equations are obtained by evaluating kinetic and potential energies of system and substituting them into Lagrange equation. The results are compared to modal results and finally the effect of pressure and density of gas in are investigated. The major findings are:
  • The gas density has significant effect on the natural frequency of the system. The natural frequency of cylindrical shell increases with increase in the pressure.

  • For the gas with higher density, the frequencies gradient decreases with respect to pressure. It is mainly because of the fact that the mass of the system has reverse effect on the natural frequency.

  • Considering both pressure and gas effect on the frequency, the effect of pressure is more than the mass, so the frequencies of system increases by increasing pressure and mass.

  • The mode shapes of the pressure vessel do not change with the pressure and density of the gas.

Notes

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Department of Aerospace EngineeringSemnan UniversitySemnanIran
  2. 2.Department of Mechanical EngineeringSemnan UniversitySemnanIran

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