10 Parachute Flight Dynamics and Trajectory Simulation Doher

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Task #3 : Estimate Snatch Force (use SNATCH) 1 INPUT File SNATCH.DAT for SNATCH98.EXE 2 for snatch force estimation 3 University of Minnesota <strong>Parachute</strong> Technology Short Course 4 _____________ 1.224 RO : air density kg/m^3 39.25 ML : mass of the load kg 0.0314 CDSL : drag area of the load m^2 0.75 MP : mass of the parachute pack kg 0.0314 CDSP : drag area of the pilot chute m^2 150.0 V0 : initial speed of both masses m/s 1.64 LS : length of suspension line m 8 N : number of suspension lines - 0.30 EPSB : relative elongation at break - 6675 FB : break strength of susp. line N 1 R : exponent of strain curve - 0.0 TA : initial value of t2 s 0.01 DT : step size of time s Study Case: Snatch Force
Results of SNATCH: Snatch occurs at t2 = 8.394841E-02 sec dels = 1.639999 m snatch force Fs = <strong>10</strong>081.66 N velocity at snatch Vs = 148.412 m/s difference velocity delV = 35.67168 m/s mass of the load mL = 39.25 kg CDS of the load CDSL = .0314 m*m mass of the parachute mP = .75 kg CDS of the parachute CDSP = .0314 m*m initial velocity V0 = 150 m/s suspension line length ls = 1.64 m number of susp. lines n = 8 - relative break length epsB = .3 - break strength of 1 line FB = 6675 N exponent of strain curve r = 1 - achieved load factor Fs/n*FB = .1887952 - Study Case: Snatch Force
Page 1 and 2: Parachute Flight Dynamics and Traje
Page 3 and 4: Questions: - Trajectory Where is th
Page 5 and 6: Why Illusions? 1. Parachutes are St
Page 7 and 8: Example: Cylindrical Payload (L) re
Page 10 and 11: - Rigid body mathematical models ge
Page 13 and 14: System Flight Stages I Payload free
Page 15 and 16: I Payload Free Flight V System Stea
Page 17 and 18: Non-linear algebraic relations: fli
Page 19 and 20: Vertical flight: System decelerates
Page 21 and 22: V / VA 1 0.8 0.6 0.4 0.2 FIG2_2 | 2
Page 23 and 24: V / Ve 5 4 3 2 1 FIG2_4 | 26.4.1997
Page 25 and 26: Task #1: Find suitable parachute -
Page 27: II Parachute Deployment with consta
Page 30: Snatch Force Estimation (SNATCH) co
Page 33 and 34: With potential energy stored in sus
Page 35: Measured T-10 Snatch Forces (from P
Page 40 and 41: Parachute inflation force: or, non-
Page 42: Pflanz- Ludtke Method: Pflanz' (194
Page 45 and 46: 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 0 0
Page 47 and 48: In horizontal flight ( = 0°) and f
Page 49 and 50: Opening Force Factor C K vs. Mass R
Page 51 and 52: Results: Opening shock Fx = 17973.3
Page 53 and 54: Stability analysis of 3DoF-System (
Page 55 and 56: Stability analysis Case: Horizontal
Page 57 and 58: Task #5a: Estimate Dynamic Stabilit
Page 59 and 60: [deg] [deg] V [m/s] FIG5_2 | 24.3.2
Page 61 and 62: 3. Pendulum motion The damping of t
Page 63 and 64: Results of OSCILALV.BAS in vertical
Page 65 and 66: Task #6: Trajectory simulation (use
Page 67 and 68: Task #6: Input data 2DOFT05.DAT for
Page 69 and 70: system data for stage: deployment o
Page 71: h [m] V [m/s] 120 100 80 60 40 20 A

10 Parachute Flight Dynamics and Trajectory Simulation Doher

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