Modeling and Control of a Steerable Cruciform Parachute System Through Experimental Testing

Herrington, Shawn M.; Renzelman, Jeff; Fields, Travis; Yakimenko, Oleg A.

doi:10.2514/6.2019-1074

Cited by 3 publications

(1 citation statement)

References 19 publications

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“…The dynamics model can simulate the trajectory and dynamic behavior of the parachute system to reduce the number of expensive and time-consuming experiments [15], [16]. For different research purposes, three-degree-of-freedom (DOF), six-DOF, nine-DOF, or higher-DOF dynamics models can be established for the parachute payload system [17]- [19]. Harlin and Cicci [20] built a six-DOF dynamic model of ballistic missile by iterating the state transition matrix in the falling process.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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To predict a parachute-warhead system's dynamic characteristics and impact point, numerical methods are used to comprehensively predict the large deformations of the parachute during the opening process and the impact point of the system in the terminal landing phase. Fluid-structure interaction simulations based on the arbitrary Lagrangian-Eulerian method are used to study the Disk-Gap-Band parachute's inflation behavior and provide the parachute's aerodynamic parameters at steady state. Based on the obtained aerodynamic data, a nine-degree-of-freedom dynamic model of the parachute-warhead system was established, which was used to predict the landing area of the system by calculating the falling trajectory. Based on the established model, an online impact point prediction program was developed. Finally, the effectiveness and accuracy of the methods were verified by airdrop experiments. The results showed that the methods for the parachute-warhead system modeling during the inflation and terminal descent phases could effectively predict its dynamic characteristics, which could be further applied for precision airdrop missions.INDEX TERMS Parachute-warhead system, parachute inflation, impact point prediction, multibody dynamics.

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Section: Introductionmentioning

confidence: 99%

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

et al. 2021

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A Review and Analysis of Existing Guided Precision Airdrop Systems

Vambol,

Kaluzhynov,

Barakhov

et al. 2023

Kosm. nauka tehnol.

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The development of airdrop systems for special landing sites of rocket-space techniques, such as rocket engines or boosters of the first stages of launch vehicles, which are salvageable or reusable, is an actual problem today. The traditional parachute systems don’t always provide the necessary accuracy for completing a flight task, and this significantly increases the risk of dangerous situations for civilians and infrastructure. The article is devoted to the study of the analysis of existing guided precision airdrop systems. The design features of various types of guided precision airdrop systems and their technical characteristics are consid- ered. The main advantages and disadvantages of the considered guided precision airdrop systems are determined. Based on the analysis, a typical design scheme has been developed for a typical representative of the family of guided precision airdrop systems. It is shown that the exploitation of experimental tests of the developed typical structural scheme with a physical dynamically similar model is the most effective and rational. A dynamically similar model has been developed for testing the automatic control system and for conducting experimental studies of the design of controlled systems for guided precision airdrop systems. The prospects for further research are discussed and aimed at developing a family of controlled systems for guided precision airdrop systems through the use of an experimental system for testing modifications to the layout and designs of the basic model using the principle of scaling according to the theory of similarity.

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Numerical Study of Aerodynamic Characteristics of No-Swinging and Free-to-Swing Cross Parachute

Hou,

Hu,

2023

AIAA Journal

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During wind-tunnel experiments on parachutes, it is common to either fix the apex of the canopy to maintain a specific angle of attack or only fix the confluence point of the suspension lines to allow the canopy to move freely. These no-swinging and free-to-swing conditions affect considerably the aerodynamic characteristics of the parachute. This paper investigates the influence of these conditions on the aerodynamic characteristics and dynamic motion characteristics of both symmetric cross parachutes with eight equal suspension lines, and asymmetric cross parachutes with two (of eight) shortened suspension lines. The research reveals that the canopy of a no-swinging cross parachute exhibits a spinning motion around its axis. The free-to-swing parachute undergoes a conical swing motion around the suspension-line confluence point. The frequency of spin and conical swing increases in proportion to [Formula: see text]. The magnitude and direction of the lift force varies periodically owing to the conical swing of the free-to-swing parachute. Conversely, the no-swinging parachute, at a fixed angle of attack, maintains a comparatively stable lift force. The free-to-swing asymmetric cross parachute produces a stronger lift force because of the larger swing angle compared to the symmetric parachute. The resultant asymmetry in the aerodynamic shape caused by the shortening of suspension lines has minimal effect on aerodynamic characteristics.

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Modeling and Control of a Steerable Cruciform Parachute System Through Experimental Testing

Cited by 3 publications

References 19 publications

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

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

A Review and Analysis of Existing Guided Precision Airdrop Systems

Numerical Study of Aerodynamic Characteristics of No-Swinging and Free-to-Swing Cross Parachute

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