Parachute opening shock

Wolf, Dean

doi:10.2514/6.1999-1702

Cited by 12 publications

(10 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, a comparison between Tables 2 and 4 shows that to theoretically halve the initial velocity (from 100 to 50 m=s) results in an approximately quarter reduction of the opening shock. This may be compared to a correlation used to calculate the opening shock as given by [6,7,10,12,[23][24][25][26][27][28][29] …”

Section: Resultsmentioning

confidence: 99%

“…Thus, theoretical studies are motivated using experimental-based correlations to acquire force history [5][6][7][10][11][12][13][14][15][16][22][23][24][25][26][27][28][29][30][31][32]. In this direction, Berndt and Deweese [5] used parachute opening images to study filling time as well as the variation of canopy projected area.…”

Section: Introductionmentioning

confidence: 99%

“…Parachute experimental studies mainly have focused on either fullscale flight, including payload drop tests (e.g., [5][6][7][8][9][10][11][12][13][14][15][16]), or subscale wind tunnel investigations (e.g., [16][17][18][19][20][21][22][23]). Behr [8] carried out payload drop tests to study acceleration of a parachute system containing three T-10 reefed parachutes from an altitude as low as 100 m. The results showed that the peak of parachute opening forces occurs before its full opening takes place.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Decisive Roll of Filling Time on Classification of Parachute Types

Mohaghegh¹,

Jahannama²

2008

Journal of Aircraft

View full text Add to dashboard Cite

In a low altitude recovery, a parachute has to reduce the recovery mass velocity to a predefined velocity before its ground impact within a vertical distance as low as possible. The article classifies various parachutes based on the parachute opening shock and distance necessary to satisfy the steady descent condition in an unreefed situation using numerical solutions of experimental and theoretical relations linked with the parachute opening and flight dynamics. Results show that the parachute filling time is the main parameter to differentiate all parachutes from each other. Based on the parachute filling time, slotted parachutes velocity history coverage locates between ribbon and ringsail parachutes, whereas solid textile parachutes span a range between extended skirt 14.3% and guide surface parachutes. In each group, a decrease in the parachute filling time as a result of the change in the parachute type causes an increase in the parachute opening shock as well as a decrease in the parachute steady distance.parachute drag force F max = opening shock g = gravity acceleration m = total recovery mass n = parachute filling parameter R m = mass ratio t = elapsed time t f = parachute filling time V = velocity X p = parachute shock reduction factor x = parachute filling distance = correlation coefficient = power of filling function = correlation exponent = air density Subscripts O = opening instant p = projected t = instant 0 = nominal

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Decisive Roll of Filling Time on Classification of Parachute Types

Mohaghegh¹,

Jahannama²

2008

Journal of Aircraft

View full text Add to dashboard Cite

show abstract

“…Two other important estimators for inflation analysis are the mass ratio R m and opening shock factor C k . The former is a rough measure of the ratio of a parachute-payload total weight, relative to that of the air co-accelerating or decelerating with the system 5,7 :…”

Section: Inflation Propertiesmentioning

confidence: 99%

Inflation and Steady Descent Characteristics of Truncated Cone Decelerators

Potvin

Peek²

2005

18th AIAA Aerodynamic Decelerator Systems Technology Conference and Seminar

View full text Add to dashboard Cite

We report on the results of a "first look" study of the inflation and descent characteristics of a new type of parachute-the truncated cone decelerator (or "TCD"). Featuring a deep conical inflated shape truncated at the apex, the TCD is being envisaged for use in windsensing applications where GPS-instrumented payloads are to be drifting freely with the wind, in a stable manner and without gliding. The combination of a low axial drag area with a high transverse drag area should rank the TCD as one of the best performers for this type of applications. The paper first presents the design characteristics of the two 2.3 height-tobase-ratio cones that were used in this study, namely a three foot-long model and a 16ftlong model. Next comes the discussion of the experimental data on fall rates, which yielded drag coefficient values approximating C D ~ 0.25. Data was also obtained with the sub-scale model being truncated at the vent, at lengths ranging from 0% to 20% of the original cone height. The paper ends with a discussion of the inflation properties, which yielded low peak drag forces and non-dimensional filling time values approximating n fill ~ 13 to 20. Nomenclature

show abstract

“…From a parachute designers standpoint, these simplification are justified for the prediction of the parameters such as inflation time and the maximum opening forces. The past research has primarily focused on obtaining these parameters from analytical theories combined experimental data (French, 1964;Knacke, 1992;Wolf, 1999). The existing theories provide reasonable results for well-known canopy geometries and conditions but have limited success with a generic parachute canopy.…”

Section: Dtmentioning

confidence: 99%

Aerodynamics of Parachute Opening

Johari¹,

Desabrais²

2002

View full text Add to dashboard Cite

Public Reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comment regarding this burden estimates or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302, and to the Office of Management and Budget, Paperwork Reduction Project (0704-0188,) Washington, DC 20503.

show abstract

Parachute opening shock

Cited by 12 publications

References 3 publications

Decisive Roll of Filling Time on Classification of Parachute Types

Decisive Roll of Filling Time on Classification of Parachute Types

Inflation and Steady Descent Characteristics of Truncated Cone Decelerators

Aerodynamics of Parachute Opening

Contact Info

Product

Resources

About