Parachute dynamics and perturbation analysis of precision airdrop system

Application of Unmanned Aerial Vehicles (a.k.a. drones) is becoming more popular and their safety is becoming a serious concern. Due to high cost of top-end drones and requirements for secure landing, development of reliable drone recovery systems is a hot topic now. In this paper, we describe the development of a parachute system with fall detection based on accelerometer-gyroscope MPU – 6050 and fall detection algorithm based on the Kalman filter to reduce acceleration errors while drone is flying. We developed the compensation algorithm for temperature-related accelerometer errors. The parachute system tests were performed from a small height on a soft surface. Later, the system was tested under real-world conditions. The system functioned effectively, resulting in parachute activation times of less than 0.5s. We also discuss the civilian and military applications of the developed recovery system in harsh (high temperature) environment.

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“…The system of equations presented here is based on the previous works of [43][44][45][46] and is defined as follows:…”

Section: Mathematical Model Of Parachute Fallmentioning

confidence: 99%

Design of Fully Automatic Drone Parachute System with Temperature Compensation Mechanism for Civilian and Military Applications

Almadani

Svirskis

Narvydas

et al. 2018

Journal of Advanced Transportation

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“…In order to improve calculation capability, Tutt et al [24] applied the Eulerian-Lagrangian penalty coupling algorithm and the multi-material arbitrary Lagrangian-Eulerian (ALE) method to research the dynamics of the parachute unfolding process. The ALE fluid-structure coupling method was also used for the Disk-Gap-Band (DGB) parachute, which proved that the DGB parachute had a strong ability to resist overload [25]- [28]. Therefore, in the damage detection experiment of the warhead, the DGB parachute was used to decelerate the warhead.…”

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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“…3 Therefore, to significantly improve the flexibility and reliability of RLVs during the airdrop process, it is necessary and important to carry out accurate attitude and position control of flight in the presence of airdrop's effect. 4 Current researches related to the airdrop mainly focused on the analysis of airdrop problem, 5 modeling of vehicle dynamics, 6 trajectory planning, 7 control law design, 8 simulation of airdrop process, 9 and so on. Gao et al 5 studied the influence of perturbation on the airdrop system.…”

Section: Introductionmentioning

confidence: 99%

“…Current researches related to the airdrop mainly focused on the analysis of airdrop problem, 5 modeling of vehicle dynamics, 6 trajectory planning, 7 control law design, 8 simulation of airdrop process, 9 and so on. Gao et al 5 studied the influence of perturbation on the airdrop system. Tao et al employed an improved genetic algorithm to solve the homing trajectory planning problem for parafoil airdrop system.…”

Section: Introductionmentioning

confidence: 99%

Rapid trajectory planning of a reusable launch vehicle for airdrop with geographic constraints

Wei

Lan

Liu

et al. 2019

International Journal of Advanced Robotic Systems

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Online feasible trajectory generation for an airdrop unpowered reusable launch vehicle is addressed in this article. A rapid trajectory planning algorithm is proposed to satisfy not only the multiple path and terminal constraints but also the complex geographic constraints of waypoints and no-fly zones. Firstly, the lower and upper boundaries of the bank angle that implement all the path constraints are obtained based on the quasi-equilibrium glide condition. To determine the bank angle directly, a weighted interpolation of the boundaries is then developed, which provides an effective approach to simplify the planning process as a one-parameter search problem. Subsequently, three types of lateral planning algorithms are designed to determine the sign of the bank angle according to the requirements of waypoints passage, no-fly-zones avoidance, and terminal constraints in the airdrop process, and the convergence of these methods for passing over the waypoints and meeting the terminal conditions has been clarified and formally demonstrated. Considering the constraints in the actual airdrop flight missions, the planning trajectory is divided into several subphases to facilitate the application of corresponding algorithms. Finally, the performance of the proposed algorithm is assessed through three airdrop missions of reusable launch vehicle with different geographic constraints. Besides, the effectiveness of the algorithm is demonstrated by the Monte Carlo simulation results.

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Parachute dynamics and perturbation analysis of precision airdrop system

Cited by 16 publications

References 32 publications

Design of Fully Automatic Drone Parachute System with Temperature Compensation Mechanism for Civilian and Military Applications

Design of Fully Automatic Drone Parachute System with Temperature Compensation Mechanism for Civilian and Military Applications

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

Rapid trajectory planning of a reusable launch vehicle for airdrop with geographic constraints

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