Notes on the Opening Behaviour and the Opening Forces of Parachutes

O'Hara, F.

doi:10.1017/s0368393100120759

Cited by 31 publications

(4 citation statements)

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“…He integrated the non-linear differential equation of motion and calculated the inflation force for the simplified case. Following this, O'Hara noted the opening behaviour and the opening forces of parachute inflation (4) in 1949, which are recently focused on by the last researchers. Thereafter a lot of engineering algorithms, numerical algorithms and experiments were used on the parachute inflation.…”

Section: Establishment Of the Multi-node Modelmentioning

confidence: 92%

Numerical simulation of fluid-structure interaction in the opening process of conical parachute

Cao¹,

Wu²,

Song³

et al. 2009

Aeronaut. j.

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According to multi-node model, the dynamics equations of conical parachute system for simulating shape deformation process of the flexible canopy in the opening process were established. With the combination of dynamics equations code and computational fluid dynamics (CFD) software, the fluid-structure interaction investigation of the conical parachute was carried out. Also the change of parachute shape and flow field, inflation time, the rate of descent, the distance of descent, and other relevant data were achieved. This paper has focused on analysing vortex structure of the flow field in the opening process of conical parachute, and laid the foundation for studying mechanics mechanism of flow field variation of conical parachute in future.

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Section: Establishment Of the Multi-node Modelmentioning

confidence: 92%

Numerical simulation of fluid-structure interaction in the opening process of conical parachute

Cao¹,

Wu²,

Song³

et al. 2009

Aeronaut. j.

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show abstract

“…This leads directly to the concept of an inflation time for a given speed and parachute. Since then many theories have been developed based on opening or filling times (O'Hara, 1949;French, 1963;Heinrich, 1969;Heinrich & Noreen, 1970;Heinrich, 1972;Payne, 1973). These 1 theories do not rely on the details of the flow around the canopies, merely the time it takes the canopy to inflate.…”

Section: Literature Reviewmentioning

confidence: 99%

Aerodynamics of Parachute Opening

Johari¹,

Desabrais²

2002

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“…In this analysis, two apparent mass coefficients, in the normal and the axial directions, were considered. In 1949,O'Hara' 10 ' developed a theory from which an appropriate value of the opening shock force on a parachute canopy can be determined. He determined an apparent mass for the parachute by considering it to be the same as that of a flat disc which had the same radius as the parachute and combining it with the air mass inside the canopy.…”

Section: The Implementation Of Apparent Mass Components Into the Equamentioning

confidence: 99%

The equations of motion for a parachute system descending through a real fluid

Yavuz

1985

Aeronaut. j.

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SummaryFor the computer simulation of bodies moving through real fluids input data about the aerodynamic and inertial forces and moments developed on them are required. It has long been known that under appropriate conditions the apparent masses of the body can play an important role in the determination of dynamic characteristics and this is certainly the case with parachute systems. In the past, because of inadequate experimental investigations, not all of the implications of apparent mass for this system have been fully appreciated. The current objective is therefore, in the light of experiments conducted on the measurement of apparent masses for some parachute canopies, to derive the relevant equations of motion for the parachute and store system and thus to determine the effects of various parameters on the dynamic characteristics of fully-deployed parachutes. In this system the store has been assumed to be rigidly connected to the canopy.

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Notes on the Opening Behaviour and the Opening Forces of Parachutes

Cited by 31 publications

References 0 publications

Numerical simulation of fluid-structure interaction in the opening process of conical parachute

Numerical simulation of fluid-structure interaction in the opening process of conical parachute

Aerodynamics of Parachute Opening

The equations of motion for a parachute system descending through a real fluid

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