Investigation of modal properties and layout of elastomer diaphragm tanks in telecommunication satellite

Sabaghzadeh, Hossein; Shafaee, Mazyar

doi:10.1007/s00542-020-04746-4

Cited by 6 publications

(5 citation statements)

References 30 publications

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“…In the past, most of them are made from a thin material with better ductility, such as rubber materials, which are fexible enough to couple to the internal surface of the shell and adjust the shape at all fll-levels. Some works [1][2][3][4][5][6] have been performed on the spacecraft propellant tanks with rubber diaphragms. However, the common propellants like hydrazine, MMH, and N 2 O 4 are not compatible with the rubber materials [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

A Study of Structural Parameters Effects on Pressure Differential to Roll Titanium Diaphragm for a Spacecraft Propellant Tank

Ma¹,

Gu²,

Zhao³

et al. 2022

Advances in Materials Science and Engineering

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A range of titanium diaphragms for spacecraft propellant tanks are designed in detail, and two typical titanium diaphragms were manufactured and corresponding reversal tests were developed. A series of finite element models of the reversal process of these titanium diaphragms is developed based on the arc-length method and a finite element analysis software. With the aid of the models, this paper analyzes the characteristics of pressure drop during the whole reversal process and investigates the effects of the structural parameters on pressure differential to roll titanium diaphragm. The results show that simulated values of the critical pressure and the overturning pressure show good agreement with measured ones. In addition, the critical pressure increases with increasing thickness, decreasing bottom diameter and chamfering radius. The thickness and the bottom diameter are the main influence factors for the critical pressure. The overturning pressure increases with increasing thickness and arc radius. These effects of the bottom diameter, the chamfering radius, and arc radius become sharper with increasing thickness.

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Section: Introductionmentioning

confidence: 99%

A Study of Structural Parameters Effects on Pressure Differential to Roll Titanium Diaphragm for a Spacecraft Propellant Tank

Ma¹,

Gu²,

Zhao³

et al. 2022

Advances in Materials Science and Engineering

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“…Numerically modeled vibration modes can also predict diaphragm rupture and friction at the normal frequencies of the diaphragm tank. The numerical model designed for the tank was able to model the fluid effect, diaphragm thickness change, and other dynamic properties of the structure and thus could reduce the costly costs of experimental tests [29]. In order to ensure the reduction of the diaphragm thickness on the diaphragm tank frequencies, the diaphragm thickness in a tank with 100% filling volume was reduced from 1.8 to 1.3 at a rate of 0.1 mm and the natural frequencies and mode shapes of the diaphragm tank were calculated.…”

Section: Natural Frequency Analysismentioning

confidence: 99%

“…This model is specifically designed to simulate the mode shapes and determine the natural frequencies of the diaphragm tank. The Modal acoustics solver calculates the natural frequencies and mode shapes of the diaphragm tank by accurately modeling the materials and geometry of the components of the diaphragm tanks in the fluid-structure interaction environment [29]. Figure 26 shows the geometry of diaphragm tank in 100% volume ratio in ANSYS workbench software.…”

Section: Natural Frequency Analysismentioning

confidence: 99%

“…Tao et al [23] for proving SMP diaphragm (shape memory polymer) capabilities analyzed the diaphragm inversion and recovery behavior by using a nonlinear finite element method and investigated the influence of structural and temperature parameters on the diaphragm inversion process and optimal diaphragm design. Sabaghzadeh et al [29] investigated the excitation specifications of the diaphragm tank under vertical vibration, by numerical method, and verified the results with experimental tests.…”

Section: Introductionmentioning

confidence: 98%

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Reversal modeling and optimal design of hyper-elastic diaphragm in space fuel tanks

Sabaghzadeh

Shafaee

2021

SN Appl. Sci.

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Diaphragm tanks are a common type of pressurized tanks in which the diaphragm is used to separate the fuel part from the high-pressure part, compress the fuel in the tank, and reduce free space to avoid liquid fuel sloshing. The main purpose of the application of the diaphragm tanks is to ensure the continuous flow of pure fuel without the gas bubble into the spacecraft engine. In space mission, diaphragm tanks will experience a wide range of acceleration at different levels of filling. These conditions change the state of equilibrium between the volume of the gas and the fluid and move the diaphragm toward the discharge portion of the tank. As a result of this movement, the diaphragm curvature is changed and the structure collapses at rest, which is called folding. When large nonlinear folding occurs, there is potential for diaphragm damage through wear, rubbing, and excessive stress. Predicting diaphragm behavior in order to calculate a diaphragm’s susceptibility to corrosion, rupture, and surface strain is one of the major design challenges. In this study, new method is provided to analyze deformation of diaphragm tanks by using numerical techniques. Also, the investigation method is verified by using experimental methods. In this process, first a 3D numerical model is developed to investigate the inverse behavior of a hyper-elastic diaphragm by using ANSYS software and the results of the simulations are compared with the results of experimental tests in the same situation. After validation, a second case study is performed to survey the effect of reducing diaphragm thickness according to the strain energy and natural frequency behavior of the diaphragm in different fill levels. The results of this study showed that numerical simulations are capable of reconstructing diaphragm inversion properties with good accuracy. In addition, the numerical model can detect the proper thickness for the diaphragm. In the last section, algorithm and software for optimal automatic modeling of diaphragm tanks are proposed.

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“…Diaphragm propellant tanks are used in many spacecraft applications, which utilize positive expulsion technology to store and manage common liquid propellants, such as Hydrazine, MMH, and N2O4 [1][2][3]. As shown in figure 1, a typical diaphragm propellant tank mainly consists of a top hemispherical shell, a diaphragm, and a bottom hemispherical shell.…”

Section: Introductionmentioning

confidence: 99%

Development of titanium diaphragms for space propellant tank

Zhang¹,

Gu²,

Zhang³

et al. 2022

J. Phys.: Conf. Ser.

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The fundamental structure of the space propellant tank is introduced. The design flow and the numerical simulation method of a typical metal diaphragm are proposed. Then, a range of 237mm diameter titanium diaphragms with different bottom fillet radiuses are designed. Based on the arc-length method, a series of finite element models of the reversal process of these titanium diaphragms are developed. With the aid of the models, this paper analyzes the effect of bottom fillet radius on pressures differential to roll the titanium diaphragms. The results show that the critical pressure increases with the decrease of the bottom fillet radius. A near linear increase is found, which indicated that the bottom fillet radius has a certain effect on the critical pressure. The maximum equivalent von mises stress increases with the decrease of the bottom fillet radius. The increase leads to the increase of the critical pressure. In addition, the deformation of the diaphragms becomes more and more instable with the decrease the bottom fillet radius.

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Investigation of modal properties and layout of elastomer diaphragm tanks in telecommunication satellite

Cited by 6 publications

References 30 publications

A Study of Structural Parameters Effects on Pressure Differential to Roll Titanium Diaphragm for a Spacecraft Propellant Tank

A Study of Structural Parameters Effects on Pressure Differential to Roll Titanium Diaphragm for a Spacecraft Propellant Tank

Reversal modeling and optimal design of hyper-elastic diaphragm in space fuel tanks

Development of titanium diaphragms for space propellant tank

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