Article
Engineering, Marine
A. Jamali, S. Jalili
Summary: This study investigates the effect of using incompressible fluid as a continuum to transfer impact energy to a broader volume of the structure. Experimental results show that the introduction of fluid reduces local deformation by an average of 25%. Numerical results reveal that at a specific layer distance, the fluid contribution to energy absorption is maximized, resulting in improved energy contribution in the inner and outer shells and reported possibility of instability in the inner shell.
Article
Engineering, Multidisciplinary
Shuihua Zheng, Yankun Yu, Mianzhen Qiu, Liumin Wang, Dapeng Tan
Summary: This study investigates the vibration response and damage detection method of fluid-filled thin cylindrical shells under the fluid-structure interaction condition. The vibration response is derived using high-order partial differential equations and the wave propagation method, while crack effects are studied using fracture mechanical principles to construct a local flexibility matrix and a breathing linear spring model. Results show significant variations in displacement response caused by nonlinear excitations, decrease in local flexibility and natural frequency due to cracks, and the effectiveness of normalized input power flows as a damage detection method for the shell.
APPLIED MATHEMATICAL MODELLING
(2021)
Article
Engineering, Multidisciplinary
Jiang-hai Wu, Rui-jie Liu, Yong Duan, Yu-dong Sun
Summary: This paper analyzes the free and forced vibro-acoustic characteristics of fluid-filled laminated cylindrical shells under initial hydrostatic pressure. The vibration equation of the shell is based on Love's theory, while the filled fluid is described using the acoustic wave equation. The initial hydrostatic pressure is incorporated into the governing equation of the shell as axial and radial forces. The proposed fluid-structure interaction model is verified by comparing the natural frequencies and dynamic responses with existing literature and FEM results. The numerical results show that boundary conditions and ply angles have an influence on the natural frequencies, and the hydrostatic pressure increases the stiffness and natural frequencies of the composite cylindrical shell. These findings can provide suggestions for the structural design of fluid-contained cross-ply laminated composite cylindrical shells.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2023)
Article
Engineering, Civil
Faizan Ul Haq Mir, Kaivalya M. Lal, Andrew S. Whittaker, Michael C. Constantinou
Summary: This study reports a numerical model capable of generating robust estimates of isolation-system and fluid-structure responses under multidirectional, high-intensity shaking, and validates the model through experimental results. The numerical model shows excellent agreement with experimental data, and has broad applicability to base-isolated, fluid-filled vessels in various industries.
EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS
(2022)
Article
Engineering, Mechanical
Lei Yang, Tao Wang, Xiao-bing Bian, Guang-yan Huang
Summary: Using liquid materials with specific geometries can enhance the explosion-proof properties of confined structures. In this study, a method of using water-filled containers was investigated to reduce the peak and permanent deformation of cylindrical explosion containment vessels. Experimental and numerical simulation results showed that bulk water with larger thickness and smaller height provided better blast mitigation and reduced up to 80.1% of permanent deformation compared to no mitigant. The momentum extraction and shadowing effect of water were identified as significant mitigation mechanisms for the internal blast in CECVs.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2023)
Article
Engineering, Civil
Weifu Sun, Tingting Zhu, Pengwan Chen, Gaojian Lin
Summary: The dynamic stability of submerged cylindrical shells subjected to underwater explosion was investigated in this work, revealing the effects of initial hydrostatic pressure and fluid-structure interaction. Critical threshold values were obtained through numerical simulations and theoretical modeling, showing that the vibrations are stable below this threshold.
THIN-WALLED STRUCTURES
(2022)
Article
Engineering, Mechanical
Antonio Zippo, Giovanni Iarriccio, Luca Bergamini, Elena Colombini, Paolo Veronesi, Francesco Pellicano
Summary: This paper presents the results of an extensive experimental campaign on the dynamic interactions between an elastic structure and a non-Newtonian fluid. The system dynamics has been analyzed in the presence of different fluid levels and high energy tests have been performed. The onset of complex dynamics has been detected using Fourier spectra and bifurcation diagrams.
JOURNAL OF FLUIDS AND STRUCTURES
(2023)
Article
Engineering, Civil
Anirudh Saboo, Manish Kumar
Summary: This study investigates a base-supported partially-filled fluid-shell system representing the pressure vessel of a fast reactor. The shell, consisting of two cylindrical parts and a conical part, is characterized using Donnell's theory, while the fluid is modeled using a velocity potential approach. The energy functional obtained from compatibility and interface conditions is minimized to determine natural frequencies. Parametric studies show that the vibration frequencies of the fluid-shell system (bulging frequencies) are similar to the shell-only vibration frequencies when only the lowermost part is filled. Vibration frequencies of the free fluid surface (sloshing frequencies) are not significantly affected by fluid height when most of the vessel is filled. The study does not consider the coupling between bulging and sloshing modes, which may need to be considered for a completely-filled vessel with a large base radius.
THIN-WALLED STRUCTURES
(2023)
Article
Mechanics
Mohammad Javad Babaei, Ali Asghar Jafari, Farin Ramezani
Summary: This investigation analyzes the effects of internal static fluid on the free vibrational behavior of joined shells made of carbon nanotube (CNT) fiber-reinforced composite. The results from experimental modal tests and parametric studies indicate that while fluid generally decreases the frequency, other parameters have similar effects on the frequency.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2022)
Article
Engineering, Ocean
Shengsheng Xia, Yingjie Wei, Cong Wang
Summary: The study used a co-simulation method to investigate high-speed water entry of shells with different slopes, finding that the slope of the shell significantly impacts cavity evolution, motion characteristics, and structural response.
APPLIED OCEAN RESEARCH
(2023)
Article
Thermodynamics
Sameed Akber, Christopher T. DeGroot, Kamran Siddiqui
Summary: This research aims to thermally regulate photobioreactors using phase change materials, in order to minimize temperature variations and improve microalgae yield. The study investigates the flow and thermal behaviors in a channel with thermal energy storage columns using numerical simulations. A parametric analysis shows that geometric parameters influence the thermal energy storage in PCM-filled columns.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Materials Science, Multidisciplinary
Shyamal Kishore, Prathmesh Naik Parrikar, Arun Shukla
Summary: The experimental study investigates the dynamic underwater response of a cylindrical composite shell to the implosion of another shell under near critical hydrostatic pressure, with variations in collapse pressures simulated by different lengths. The response of the secondary shell is influenced by inner and outer critical stand-off distances, with the relative orientation of modal shapes determining the collapse behavior. If the stand-off distance exceeds the outer critical distance or if the secondary shell is 20% shorter, bending and breathing modes are observed with no visible damage.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Engineering, Ocean
Shengsheng Xia, Yingjie Wei, Cong Wang, Wei Cao
Summary: In this paper, numerical simulation of the oblique water-entry process of the semi-sealed and completely sealed cylindrical shell is conducted using a collaborative simulation method. The results indicate that the asymmetric distribution of the jet formed below the shell causes significant changes in the attitude angle of the shell. The force and stress of the shell are found to be greater for a water entry angle of 90 degrees. Moreover, the shells at different water entry angles move upward after reaching the inflection point, with the range of upward movement increasing gradually with decreasing water entry angle.
APPLIED OCEAN RESEARCH
(2023)
Article
Engineering, Mechanical
Muzamal Hussain, Muhammad N. Naeem
Summary: Shell motion equations based on Love's first order shell theory are studied. Vibration of fluid-filled three layered cylindrical shells and the effect of varying constituent materials on frequencies are investigated. Partial differential equations are used and solved using approximate techniques, with the incorporation of sound pressure in fluid using acoustic wave equation.
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2022)
Article
Engineering, Marine
Lin Zhang, Tao Zhang, Tianyun Li, Tuguang Liu
Summary: Water-filled double-layer structures have a significant impact on collision experiments, as carried water couples with the hull structure and participates in the energy absorption process.