A method for obtaining additional mass during parachute opening process in airdrop test
A technology of process addition and acquisition method, which is applied in the field of acquisition of additional mass during parachute opening in airdrop tests, can solve problems such as additional errors in load calculation, and achieve the effect of reducing errors
Active Publication Date: 2021-07-13
BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH
View PDF3 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Commonly used engineering estimation methods may bring additional errors to the load calculation of the parachute deployment process
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0051] The present invention will be further elaborated below in conjunction with embodiment.
[0052] The invention provides a method for acquiring additional mass of a parachute during an airdrop test, and provides a method for obtaining the load, speed and acceleration data of a parachute during the parachute opening process through a measuring device, and then analyzing the projected area change during the parachute opening process, The projected area of the parachute and its variation with time were obtained. On the other hand, according to the definition of additional mass, the projected area of the parachute-opening process is used to deduce the calculation formula of the additional mass and its derivative with respect to time. Through the force analysis of the parachute-opening process, the additional mass coefficient is calculated, and finally substituted into the additional mass The calculation formula obtains the calculation method of the added mass of the parac...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to a method for obtaining additional mass during the parachute opening process in an airdrop test, belonging to the field of aerospace aerodynamic deceleration; step 1, measuring and obtaining the load F of the connected object on the parachute k , velocity v and acceleration step 2, obtain the projected area S of each frame of the parachute opening process P and the derivative of the projected area changing with time Step 3: Set the projected area when the parachute is fully deployed as S Pmax ; Calculate the relative projected area S of each frame r And the time-varying derivative Step 4. Calculate the resistance area CD of each frame s ; Step 5: Establish additional mass m f and the calculation equation of the derivative with time; step six, establish the force equation of the parachute opening process; step seven, calculate the additional mass coefficient k; calculate the additional mass m of each frame f The present invention obtains data such as the projected area of test load, speed, parachute parachute opening process by airdrop test measuring equipment, finally calculates and obtains the additional mass of parachute parachute process.
Description
technical field [0001] The invention belongs to the field of aerospace aerodynamic deceleration, and relates to a method for acquiring additional mass during parachute opening in an airdrop test. Background technique [0002] In the aerospace field, the parachute is an important aerodynamic deceleration and stabilization device. During the opening process of the parachute, the shape and aerodynamic force of the parachute change sharply. The size and acceleration of the parachute are relatively large. Overcoming the inertia of the surrounding fluid (additional mass) will generate greater resistance. Therefore, in the load calculation of the parachute opening process The effect of additional mass must be considered. [0003] At present, the commonly used calculation methods of additional mass include test method, theoretical calculation, and engineering estimation. Among them, in the test method, it is generally obtained by measuring the resistance generated by instantaneous...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G01M9/00
CPCG01M9/00
Inventor 黄明星王文强蒋伟唐明章吕智慧隋蓉李少腾林汝领鄢南兴
Owner BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH