Fig.1

Workflow of parachute cluster deceleration system

Fig.2

Definition of coordinate system for parachute cluster system

Table 1

Fitting parameters of aerodynamic model for large parachute［4］

Fig.3

Fitting curve of axial force coefficient for large parachute

Fig.4

Fitting curve of normal force coefficient for large parachute

Fig.5

Schematic diagram of parachute cluster collision relationship

Fig.6

Schematic diagram of parachute cluster collision contact

Table 2

Comparison of model degrees of freedom between parachute cluster and single parachute systems

Fig.7

Flexible constraints for single parachute and parachute cluster systems

Table 3

Initial conditions for simulation

Table 4

Characteristic parameters of capsule and parachute cluster

Fig.8

Time history curves of capsule altitude

Fig.9

Time history curves of capsule velocity

Fig.10

Time history curves of angle of pitch of capsule

Fig.11

Time history curves of swing angle of capsule

Fig.12

Time history curve of capsule overload

Fig.13

Time history curves of drogue riser tension

Fig.14

Time history curves of swing angle of drogue

Fig.15

Time history curves of relative distance between drogues

Fig.16

Time history curves of main parachute riser tension

Fig.17

Time history curves of main parachute swing angle

Fig.18

Time history curves of Relative distance between main parachutes

Fig.19

Time history curves of total attack angle of main parachute considering the wind

Fig.20

Time history curves of main parachute total attack angle without considering the wind

Fig.21

Time history curves of main parachute riser tension in failure mode

Table 5

Initial conditions for uncertainty simulation

Table 6

Uncertainty factor setting

Fig.22

Velocity distribution of first-stage opening of drogues

Fig.23

Velocity distribution of second-stage opening of drogues

Fig.24

Velocity distribution of third-stage opening of drogues