Airdrop recovery systems with self-inflating airbag : modeling and analysis / Hongyan Wang [and three others].

Format:

Book

Author/Creator:

Wang, Hongyan, author.

Language:

English

Subjects (All):

Air bag restraint systems.

Airdrop.

Physical Description:

1 online resource (264 pages) : illustrations

Edition:

1st ed.

Place of Publication:

Fusionopolis Walk, Solaris South Tower, Singapore : Wiley, 2017.

Summary:

A complete reference text to airdrop recovery systems with self-inflating airbags, focusing on analysis, test data, and engineering practicalities * Comprehensively covers the fundamental theories, design, matching, and analysis of airdrop recovery systems that include a parachute and self-inflating airbag system * Gives step-by-step guidance to aid readers in analyzing and designing their own recovery systems * Highlights advanced research programs in the field of airdrop recovery systems, such as simulation and optimization methods.

Contents:

Intro

Title Page

Copyright Page

Contents

Preface

Chapter 1 Introduction

1.1 Categories and Recovery Modes of the Recovery System

1.1.1 The Parachute System

1.1.2 The Ground Landing Cushioning System

1.1.2.1 Compressible Materials

1.1.2.2 Retrorocket

1.1.2.3 Recovery Airbag

1.1.3 Other Recovery Devices

1.1.3.1 Location-identifying Device

1.1.3.2 Floating Device

1.1.3.3 Parachute System Landing Release Lock

1.2 Present Status of Recovery Technology

1.2.1 Present State of Research on the Parachute System

1.2.1.1 Present State of Research on the Deployment Process

1.2.1.2 Present State of Research on the Inflation Process

1.2.1.3 Present State of Research on Parachute‐payload System Dynamic Modeling

1.2.1.4 Present State of Research on the Sling System

1.2.2 Present State of Research on the Cushioning Airbag

1.2.2.1 Closed Airbag

1.2.2.2 Venting Airbag

1.2.2.3 Combination Airbag

1.2.2.4 Airbag Modeling Technology Development

Chapter 2 Analysis of the Working Characteristics of the Parachute System

2.1 Kinetic Model of the Working Process of the Parachute System

2.1.1 Basic Theory of Parachute System Modeling

2.1.1.1 Geometric Structure of the Parachute

2.1.1.2 Coordinates and Conversion

2.1.1.3 Parachute Added Mass

2.1.1.4 Parachute Aerodynamic Force

2.1.1.5 Parachute Opening Modeling Basis

2.1.1.6 Steady Fall Process Modeling Basis

2.1.2 Parachuting Process Kinetic Modeling

2.1.2.1 Extraction Process Modeling

2.1.2.2 Deployment Process Modeling

2.1.2.3 Inflation Process Modeling

2.1.2.4 Steady Fall Process Modeling

2.1.3 Simulation of the Whole Airdrop Process

2.1.3.1 Windless Condition

2.1.3.2 Windy Condition

2.2 Statistical Distribution of Airdrop Equipment Landing Velocity and Attitude Parameters.

2.2.1 Airdrop Simulation Methods with Random Factors Taken into Consideration

2.2.1.1 Monte Carlo Method

2.2.1.2 Response Surface Method

2.2.2 Application of the Monte Carlo Method in Calculating Landing Velocities and Attitudes of the Parachute System

2.2.3 Airdrop Equipment Parachute System Model Parameter Sensitivity Analysis

2.2.3.1 Basic Principle of Sensitivity Analysis

2.2.3.2 Model Parameter Sensitivity Analysis

2.2.4 Probability Distribution of Random Factors of the Parachute System

2.2.5 Distribution of Landing Velocities and Attitude Angles

Chapter 3 Self-inflating Cushioning Airbag Analytical Modeling and Cushioning Characteristic Analysis

3.1 Cushioning Airbag Analytical Modeling

3.1.1 Basic Hypotheses

3.1.2 Analytical Modeling of Single-chamber Airbag

3.1.2.1 Load Kinetic Equation

3.1.2.2 Air Flow Velocity of the Airbag Venting Hole

3.1.2.3 Airbag Venting Hole Air Flow Change Rate

3.1.2.4 State Parameters of the Gas in the Airbag Compression Process

3.1.3 Analysis of Factors Affecting Single-chamber Airbag Cushioning Characteristics

3.1.3.1 Impact of the Initial Pressure

3.1.3.2 Impact of the Initial Landing Speed

3.1.3.3 Impact of Load Mass

3.1.3.4 Impact of Venting Hole Area

3.1.3.5 Impact of Venting Hole Opening Pressure

3.2 Double-chamber Airbag Modeling, Characteristic Calculation and Influencing Factor Analysis

3.2.1 Double-chamber Airbag Model

3.2.2 Analysis of Double-chamber Airbag Cushioning Characteristics and Influencing Factors

3.2.2.1 Impact of Initial Air Pressure

3.2.2.2 Impact of Vent and Venting Hole Area

3.2.2.3 Impact of the Ratio of the Auxiliary Airbag Volume to the Main Airbag Volume

3.2.2.4 Impact of Load Mass

3.2.2.5 Impact of Initial Landing Speed

3.3 Cushioning Airbag System Parameter Design and Matching Method.

3.3.1 Dimensionless Transformation of Airbag Analytical Model

3.3.2 Airbag Dimensionless Parameter Matching Diagram

3.3.2.1 Basic Airbag Design Requirements

3.3.2.2 Airbag Dimensionless Parameter Matching Diagram Drawing

3.3.2.3 Application of Airbag Dimensionless Parameter Matching Diagram

3.3.3 Analysis of Factors Affecting Airbag Cushioning Characteristics

3.3.3.1 Venting Hole Area

3.3.3.2 Airbag Height and Base Area

3.3.3.3 Initial Landing Speed and Load

3.3.3.4 Opening Pressure of Venting Hole

3.3.3.5 Fabric Extension

3.3.4 Airbag Parameter Matching Methods and ApplicationCalculation Examples

3.4 Cushioning Airbag Parameter Optimization Based on Analytical Model

3.4.1 Multi-objective Optimization Problem

3.4.2 Airbag Optimization Model

3.4.2.1 Objective Function

3.4.2.2 Optimization Variables

3.4.2.3 Constraint Conditions

3.4.3 Parameter Optimization Results

3.4.3.1 Single-chamber Airbag Parameter Optimization

3.4.3.2 Double-Chamber Airbag Parameter Optimization

Chapter 4 Equipment-airbag System Nonlinear Finite Element Modeling and Cushioning Process Simulation

4.1 Explicit Dynamic Finite Element Method

4.1.1 Finite Element Method Overview

4.1.2 Advantages of Explicit Dynamic Finite Element Method

4.1.3 Explicit Central Difference Method

4.1.4 Stability of Explicit Algorithm

4.1.5 Hourglass Phenomenon

4.2 Equipment-airbag System Model

4.2.1 Airbag Model

4.2.1.1 Basic Assumptions

4.2.1.2 Basic Control Equations

4.2.1.3 Airbag Finite Element Model

4.2.2 Contact Model

4.2.2.1 Equipment and Airbag Contact Model

4.2.2.2 Airbag Self-contact Model

4.3 Equipment-airbag System Landing Cushioning Process Simulation

4.3.1 Airbag Cushioning Characteristics

4.3.2 Verification and Analysis of Simulation Results.

4.4 High Altitude Airdrop Failure Case Analysis and Countermeasures

4.4.1 Characteristics of High Altitude Airdrop

4.4.1.1 Impact of High Altitude on Deceleration Parachute

4.4.1.2 Impact of High Altitude on Airbag Performance

4.4.2 Statistics of Equipment Attitude in High Altitude Airdrop

4.4.3 High Altitude Airdrop Landing Stability Analysis

4.4.3.1 High Altitude Airdrop and Standard Atmosphere Airdrop Vertical Landing Process Comparison and Simulation Analysis

4.4.3.2 Analysis of Comparison and Simulation of High Altitude Airdrop and Standard Atmosphere Airdrop, Considering Attitude Angle

4.4.4 Solutions to Stability Problem in High Altitude Airdrop

Chapter 5 Test and Verification of Cushioning Characteristics of the Airbag System

5.1 Airbag Launch Test System

5.1.1 Airbag Launch Device

5.1.2 Test Airbag

5.1.3 Test Balance Weight

5.1.4 Sensor and Installation

5.1.5 Dynamic Signal Data Acquisition System

5.1.6 High-speed Camera System

5.2 Test Plan Design

5.3 Test Result Analysis and Model Verification

5.3.1 Test Data Processing and Analysis

5.3.1.1 Impact of Initial Landing Speed on the Airbag Cushioning Characteristics

5.3.1.2 Impact of Load Mass on the Airbag Cushioning Characteristics

5.3.1.3 Impact of the Bonding of Venting Hole on the Airbag Cushioning Characteristics

5.3.1.4 Impact of the Initial Landing Speed on the Maximum Overload

5.3.2 Airbag Analytical Model Verification

5.3.3 Airbag Dimensionless Analytical Model Verification

Chapter 6 Cushioning Airbag Optimization Design and Evaluation

6.1 Airbag System Matching Parameter Sensitivity Analysis

6.2 Surrogate Model-based Airbag Parameter Optimization Design

6.2.1 Surrogate Model Technology

6.2.2 Experimental Design

6.2.3 Surrogate Model Construction

6.2.3.1 Polynomial Fitting.

6.2.3.2 Moving Least Squares Fitting

6.2.3.3 Radial Basis Function Fitting

6.2.4 Parameter Optimization

6.3 Evaluation of Cushioning Airbag Optimization Design Results

Conclusion

References

Index

EULA.

Notes:

Includes bibliographical references and index.

Description based on online resource; title from PDF title page (ebrary, viewed July 15, 2017).

ISBN:

9781119237372

1119237378

9781119237365

111923736X

9781119237358

1119237351

OCLC:

987012477