Hydrostatic equilibrium

About: Hydrostatic equilibrium is a research topic. Over the lifetime, 2451 publications have been published within this topic receiving 62172 citations.

The effect of gravity and hydrostatic initial stress with variable thermal conductivity on a magneto-fiber-reinforced

Abstract: The present paper is concerned at investigating the effect of hydrostatic initial stress, gravity and magnetic field in fiber-reinforced thermoelastic solid, with variable thermal conductivity. The formulation of the problem applied in the context of the three-phase-lag model, Green-Naghdi theory with energy dissipation, as well as coupled theory. The exact expressions of the considered variables by using state-space approaches are obtained. Comparisons are performed in the absence and presence of the magnetic field as well as gravity. Also, a comparison was made in the three theories in the absence and presence of variable thermal conductivity as well as hydrostatic initial stress. The study finds applications in composite engineering, geology, seismology, control system and acoustics, exploration of valuable materials beneath the earth's surface.

An isotropic compact stellar model in curvature coordinate system consistent with observational data

Abstract: This paper investigates a spherically symmetric compact relativistic body with isotropic pressure profiles within the framework of general relativity. In order to solve the Einstein's field equations, we have considered the Vaidya-Tikekar type metric potential, which depends upon parameter K. We have presented a perfect fluid model, considering K 1, which represent compact stars like SMC X-1, Her X-1, 4U 1538-52, SAX J1808.4-3658, LMC X-4, EXO 1785-248 and 4U1820-30, to an excellent degree of accuracy. We have investigated the physical features such as the energy conditions, velocity of sound, surface redshift, adiabatic index of the model in detail and shown that our model obeys all the physical requirements for a realistic stellar model. Using the Tolman-Oppenheimer-Volkoff equations, we have explored the hydrostatic equilibrium and the stability of the compact objects. This model also fulfils the Harrison-Zeldovich-Novikov stability criterion. The results obtained in this paper can be used in analyzing other isotropic compact objects.

Design and Control of a Compliant Electro-Hydrostatic-Powered Ankle Prosthesis

Abstract: In this article, a new compliant powered ankle prosthesis driven by electro-hydraulic technology is proposed. Compared with ankle prostheses driven by electromechanical or hydraulic driving systems, the proposed prosthesis solves the contradiction between the output power and the prosthetic mass, thus provides sufficient output performance with a lower installed power. Specifically, we novelly combine the hydraulic pump and accumulators to realize the precise control of energy storage and release. Moreover, high-speed on - off valves controlled by pulsewidth modulation is used to adjust the hydraulic damping in real time, which provides a concept for the active compliance control of the prosthesis. The effectiveness of proposed prosthesis is tested via a series of experiments, which shows that the efficiency reaches 62%.