Fluid-Structure Interaction Simulation and Accurate Dynamic Modeling of Parachute Warhead System Based on Impact Point Prediction

Hong, Zhao; Sun, Qinglin; Tan, Panlong; Chen, Zengqiang; Dehmer, Matthias; Xie, Guangming

doi:10.1109/access.2021.3099248

Cited by 3 publications

(3 citation statements)

References 31 publications

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“…The results show that the elastic moduli and shear moduli of fabrics vary with the inflation pressure, weave structure, and material properties of the fibers. Some researchers have proposed fluid-structure interaction (FSI) methods to simulate the nonlinear flexible behavior of parachute canopies [2,[12][13][14]. Most studies concentrated on the parachute inflation process involving observations of opening times and stress distributions under various loading conditions and structural responses.…”

Section: Introductionmentioning

confidence: 99%

“…The fluid-structure interface is solved by arbitrary Lagrangian-Eulerian (ALE) methods, where the fluid and structure meshes are independent, and the structure can cross a fixed fluid mesh [19]. The simulation tools utilized in this study have been validated against experimental results in previous works [13], demonstrating their accuracy in predicting structural deformations during inflation and aerodynamic performance in the steady descent phase of the parachute warhead system. This study provides quantitative and qualitative analyses of the FSI results, examining the macroscopic shapes and microscopic wrinkles of the parachute.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Shear Modulus on the Inflation Deformation of Parachutes Based on Fluid-Structure Interaction Simulation

et al. 2023

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Parachutes and other inflatable aerodynamic decelerators usually use flexible fabrics due to their lightweight and high load-carrying capacity. The behavior of fabrics during complex deformations is mainly influenced by their shear properties. The shear properties of fabric can be explained by the shear stiffness or shear modulus. The design optimization of these inflatable structures relies on a detailed knowledge of the mechanical properties of the fabric material. To investigate the effect of shear modulus on the inflatable shapes of parachute canopies, an arbitrary Lagrangian–Eulerian coupling method based on the incompressible computational fluid dynamics solver and structural solver LS-DYNA is proposed. Finite element methods are used to describe continuous materials such as fabrics and airflow fields. The effects of the shear modulus on the inflated parachute shapes are investigated from the macroscopic and microscopic scales. A comparison analysis reveals that different shear moduli have little effect on the overall shape and in-plane shear strain of the parachute, while they have significant effects on the in-plane stress distribution and wrinkles of the parachute. The methods and conclusions of this paper can provide some reference for the materials design of parachutes in preforming stage.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Shear Modulus on the Inflation Deformation of Parachutes Based on Fluid-Structure Interaction Simulation

et al. 2023

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“…A heavy equipment airdrop is a complex system with human-machine interaction, humanhuman interaction, and high mission requirements, and any problems related to the human-machine-environment may adversely impact the safety of the airdrop mission. There have been many accidents caused by the failure of airdrop missions [2,3]. For instance, in 2016, the Ukrainian Air Force used an Il-76 aircraft to drop a BMD-2 paratrooper chariot during a training.…”

Section: Introductionmentioning

confidence: 99%

Safety Assessment of Transport Aircraft Heavy Equipment Airdrop: An Improved STPA-BN Mechanism

Tian

Kan

et al. 2022

IEEE Access

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Aviation safety has been an eternal theme, and safety assessment is taken as the important method to assess the aircraft safety, but it is difficult to assess the safety of a heavy equipment airdrop from a transport aircraft due to mission complexity and strong coupling. This study uses an improved STPA-BN methodology to assess the safety of transport aircraft heavy equipment airdrop. To this purpose, qualitative safety analysis is performed by STPA, and then quantitative safety assessment is performed by BN. In contrast to the-state-of-the-art, the distinguishing feature of the proposed design lies in the introduction of DS evidence theory, which makes the probability of nodes in BN a priori. More precisely, best-worst multicriteria decision-making method (BWM) is skillfully incorporated into the DS evidence theory so as to tackle the conflict issue that exists in most existing designs. Importance analysis is utilized to determine the importance of the different risk nodes. A case of transport aircraft heavy equipment airdrop mission is used to test the effectiveness of the proposed method.INDEX TERMS Heavy equipment airdrop, STPA-BN, BWM, Safety assessment.

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Ballistic Fitting Impact Point Prediction Based on Improved Crayfish Optimization Algorithm

Yang,

Wang,

2024

Aerospace

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To solve the problem of difficulty in predicting the impact point clearly and promptly during projectile flight, this paper proposes an improved ballistic-impact-point prediction method. A certain type of high-spinning tailed projectile is taken as the research object for online real-time landing point prediction research. This study comprehensively utilizes the real-time radar measurement data and the geomagnetic data measured by the bomb-carried geomagnetic sensor. It applies the four-degree-of-freedom ballistic model to predict the landing point. First, the roll angular velocity is calculated based on the geomagnetic data, after which the radar real-time measurement data are segmentally fitted using the improved crayfish algorithm. Then, the fitted parameters are substituted into the four-degree-of-freedom ballistic model. Finally, the C-K method is used to identify the aerodynamic parameters, and the identified aerodynamic parameters are used for fallout prediction. The simulation results show a small deviation between the predicted and actual impact points using the improved ballistic-impact-point prediction method.

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Fluid-Structure Interaction Simulation and Accurate Dynamic Modeling of Parachute Warhead System Based on Impact Point Prediction

Cited by 3 publications

References 31 publications

Effect of Shear Modulus on the Inflation Deformation of Parachutes Based on Fluid-Structure Interaction Simulation

Effect of Shear Modulus on the Inflation Deformation of Parachutes Based on Fluid-Structure Interaction Simulation

Safety Assessment of Transport Aircraft Heavy Equipment Airdrop: An Improved STPA-BN Mechanism

Ballistic Fitting Impact Point Prediction Based on Improved Crayfish Optimization Algorithm

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