This paper presents the design optimization of composite submersible cylindrical pressure hull subjected to 3 MPa hydrostatic pressure. The study is conducted for cross-ply layups [0s/90t/0u], [0s/90t/0u]s, [0s/90t]s and [90s/0t]s considering three uni-directional composites, i.e. Carbon/Epoxy, Glass/Epoxy, Boron/Epoxy. performed by coupling a Multi-Objective Genetic Algorithm (MOGA) Analytical Analysis. Minimizing buoyancy factor maximizing buckling load are considered as objectives study....

Radomes are usually constructed from sandwich structures made of materials which have a low dielectric constant so that they do not interfere with electromagnetic waves. Performance the antenna is increased by appropriate assortment enabling it to survive under marine applications, and depends on composite strength-to-weight ratio, stiffness, resistance corrosion. The design core submarine radome greatly material system, number layers, orientation angles, thickness material. In this paper,...

This paper describes an optimization study of a spherical composite submersible pressure hull employing genetic algorithm (GA) in ANSYS. A total five lay-up arrangements were optimized for three unidirectional composites carbon/epoxy, glass/epoxy, and boron/epoxy. The minimization the buoyancy factor (B.F) was selected as design objective. Tsai-Wu Tsai-Hill failure criteria buckling strength (λ) used material instability constraints. To determine effect geometric non-linearity imperfections...

This paper describes a design optimization study of the composite egg-shaped submersible pressure hull employing and finite element analysis (FEA) tools as first attempt to provide an optimized for manufacturing or further investigations. A total 15 optimal designs under hydrostatic are obtained in terms fibers' angles number layers 5 lay-up arrangements 3 unidirectional (UD) materials. The process is performed utilizing genetic algorithm FEA ANSYS. minimization buoyancy factor (B.F)...

In this paper, a novel concept designed of multi-legged underwater manned seabed walking robot is presented. The will be used in both shallow water current (1–2 m/sec) and deep up to 500 m. It powered by an external electric power source through tether cable. walks on the with six legs, which makes it distinct from conventional screw-propelled robots. can walk calmly without making turbid. Two anterior arms act as manipulators. All leg joints manipulators are controlled Brushless Direct...

The main objective of this study is to design composite shells i.e. long, short, thin and thick for the different underwater applications. These can be a part pressure hulls, vehicles, pressurized tanks, cables pipelines etc. This paper presents comprehensive procedures mathematical modeling elastic buckling submersible under hydrostatic pressure. First order shear deformation theory (FOSDT) was used modeling. FOSDT mathematically derived shells, it all types shells. After derivation theory,...

Fiber-reinforced polymer (FRP) composite bridges are usually constructed for rapid installation. The durability of the bridge is increased by stiffness, strength to weight ratio, and corrosion resistance. main factors on which design sandwiched considerably depends ply layers, material system, alignment angles, thickness core. In this work, a parametric study using finite element analysis (FEA) presented. Two types materials—carbon fiber reinforced (CFRP) glass (GFRP)—were used as sandwich...

IPMC is used as artificial muscle in bioinspired micro structures/devices due to its low voltage actuation, high bending deformation, rapid response and capability be operated aqueous environment. In this paper, deflection analysis of actuated fin a fish like device presented find out angle attacks generated by under different voltages applied it. A novel approach perform motion mechanisms for biomimetic robots true actuation presentation the actuator. This paper also contributes present...

In this work, a transient CFD analysis is performed to analyze the effects posed by changing phase angle between displacer and power piston in free Stirling engine. The numerical model that used for axisymmetric which contains live engine spaces (expansion compression space) dead (heater, regenerator, cooler). movements are defined user function. results showed ratio pressure wave amplitude strong function of peaked at 120? angle. optimum also with operating frequency. suitable 80 Hz range...

This research investigates the rising problem of air pollution, which is a serious issue affecting people's health and environment on global scale. Focusing Lahore, Pakistan, city facing severe examines Air Quality Index (AQI) from May 2019 to December 2023. Using Facebook Prophet model for time-series forecasting, analysis reveals trends at monthly, weekly, hourly intervals. Peak AQI concentrations are identified in winter months, notably January, aligning with hazardous smog levels. Weekly...

Responsible leadership and employees' creativity are the main objectives of this study. There has been a strong emphasis on styles, but it is rarely discussed from perspective responsible leadership. The article also explores how knowledge sharing facilitates creative input employees when leaders responsible. This research based social learning exchange theories. We analyzed data collected administrators public sector universities in Pakistan using SPSS SMART PLS 4. Validity reliability...

Presented results report some of the findings a detailed failure analysis carried out on main rotor hub assembly, which had symptoms burning and mechanical damage. The suggests environmental degradation grease causes pitting bearing-balls. consequent inefficient lubrication raises temperature leads to smearing cage material (brass) bearing-balls ultimately failure. has been supported by microstructural studies, thermal micro-hardness testing performed affected bearing parts.

The vibrations of circular, annular and sector plates are different boundary value problems due to edge conditions thus have been treated separately using solution algorithms procedures. In this paper, a unified method is proposed for vibration analysis moderately thick annular, circular their counterparts with arbitrary conditions. unification these physically achieved by applying the coupling spring’s technique at radial edges ensure appropriate continuity Irrespective shape plate type...

In this paper, an improved Fourier series method is presented for vibration analysis of moderately thick annular and circular sector plates subjected to general elastic boundary conditions along its edges. literature, classical have been studied in detail however practical engineering applications the are not always nature. Therefore, study response these far needed. presented, artificial spring technique has employed simulate first order shear deformation theory formulate theoretical model....

The purpose of this research is to investigate the influence responsible leadership on employee creativity. It has been pointed out that creativity examined from different styles but rarely a responsive perspective. also examines moderating role perceived organizational support between and This based social exchange learning theories. data were collected administrative employees public sector higher education institutions (universities) Punjab province, Pakistan analyzed using SPSS SMERT PLS...

Background: Care of heart patients especially after coronary artery bypass graft (CABG) surgery can be difficult to manage in postoperative phase due decreased cardiac output. Inotropes used increase output during the peri or may cause harmful effects. Mechanical circulatory support devices, such as an intra-aortic balloon pump beneficial patients. Objective: To compare early outcomes Intra-Aortic Balloon Pump (IABP) Patients Undergoing Coronary Artery Bypass Grafting Surgery Methods:...