Wing Elasticity Effects on Store Separation

Mizrahi, Izhak; Raveh, Daniella E.

doi:10.2514/1.c035204

Cited by 3 publications

(3 citation statements)

References 17 publications

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“…The experimental results show that the presence of hatch will affect the pitching moment of store after leaving the internal bay. For the external store, the research of Mizrahi et al [15,16] suggested that the rolling motion in the separation process of external store is affected by the relation between the ejection period and the low structural frequencies of the wing. A similarity law between the separation of a heavy store and the unsteady wind tunnel free flight tests of air-launch rockets was derived, is can be used to the research of the separation of a heavy store [17,18].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation about the Characteristics of the Store Released from the Internal Bay in Supersonic Flow

Cheng¹,

Si²,

Li³

et al. 2023

Computer Modeling in Engineering &Amp; Sciences

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To understand the influence of the initial release conditions on the separation characteristics of the store and improve it under high Mach number (Ma = 4) flight conditions, the overset grid method and the Realizable k − ε turbulence model coupled with an equation with six degrees of freedom are used to simulate the store released from the internal bay. The motion trajectory and the attitude angle of the store separation under the conditions of different centroid, velocity, height and control measures are given by the calculated result. Through analysis, the position of the centroid will affect the separation of the store, which needs to be considered in the design. Increasing the launching height is conducive to the separation of the store. If the store has an initial velocity, it can leave the internal bay more quickly and reduce the probability of collision with the wall. Cylindrical rod and slanted aft wall control measures can improve the attitude of the store and make the store fall more smoothly.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation about the Characteristics of the Store Released from the Internal Bay in Supersonic Flow

Cheng¹,

Si²,

Li³

et al. 2023

Computer Modeling in Engineering &Amp; Sciences

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show abstract

“…It has been used in the simulation of unsteady process of multibody separation and aeroelasticity. Izhak et al [11] studied the influence of elastic wing on the release of external stores. They indicated that the rolling motion of external stores caused by the bending deformation of the wing affects the separation safety.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Aeroelasticity Effect on Missile Separation from the Internal Bay

Tian

2023

International Journal of Aerospace Engineering

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There is a strong aerodynamic interference when launching the missile in the embedded mode. During the separation process, the carrier aircraft safety may be threatened due to large slenderness ratio, low structural stiffness, and aeroelasticity effects of the missile. The present study simulates missile separation in the presence of the aeroelasticity effects based on the computational fluid dynamics (CFD), rigid body dynamics (RBD), and computational structure dynamics (CSD) coupling method. A hybrid dynamic grid method consisting of the mixed overset unstructured grid and deformation grid is utilized. In order to verify the accuracy of the coupled numerical method, store separation from a wing and AGARD 445.6 wing flutter are first simulated as two standard test cases. The verification results imply that the present coupled numerical method is reliable and capable in simulation of the aeroelastic effect in missile separation. The influence of aeroelasticity on the separation trajectory of a missile from the internal bay is systematically studied at different states. Numerical results show that aeroelasticity substantially affects the missile angular displacement, while it has a slight impact on the linear displacement of the center of mass. Mach number and flight altitude are two important flight parameters that characterize the aeroelasticity effect on missile separation from the internal bay.

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“…In most safe separation studies, the wing is assumed to be rigid. Still, there are some works that consider the effect of wing elasticity on the store separation process [7][8][9]. In these studies, the focus is on the store trajectory, rather than the response of the wing.…”

Section: Introductionmentioning

confidence: 99%

Aeroelastic Response of Aircraft Wings to External Store Separation Using Flexible Multibody Dynamics

Tamer

2021

Machines

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In aviation, using external stores under the wings is a common method of carrying payload or fuel. In some cases, the payload can be rigidly attached to the wing. However, stores must often be ejected during flight for aircraft, such as military type, which carry drop tanks and missiles. This may cause the wing to respond dynamically with increasing amplitudes, due to the impulsive load of ejection and the change of total mass. This is especially critical in aircraft with highly flexible wings, such as those with high aspect ratios. In this case, it is crucial to evaluate the wing response to store separation, which requires a suitable simulation environment that is able to support nonlinear and multidisciplinary analysis. To address such a need, this work presents the use of flexible multibody dynamics in the simulation of wing response to store separation. To demonstrate, a highly compliant wing was selected with a rigid body that was mounted on the wing to represent an external store. The time marching simulation of the wing before and after the store separation was presented to show the features and benefits of the method.

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Wing Elasticity Effects on Store Separation

Cited by 3 publications

References 17 publications

Numerical Simulation about the Characteristics of the Store Released from the Internal Bay in Supersonic Flow

Numerical Simulation about the Characteristics of the Store Released from the Internal Bay in Supersonic Flow

Investigation of Aeroelasticity Effect on Missile Separation from the Internal Bay

Aeroelastic Response of Aircraft Wings to External Store Separation Using Flexible Multibody Dynamics

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