US 11,814,331 B2
Method for reducing propellant curing residual stress by high-energy acoustic beam
Chunguang Xu, Beijing (CN); Peng Yin, Beijing (CN); Yuren Lu, Beijing (CN); Ruili Jia, Beijing (CN); and Jianfeng Song, Beijing (CN)
Assigned to BEIJING INSTITUTE OF TECHNOLOGY, Beijing (CN)
Filed by BEIJING INSTITUTE OF TECHNOLOGY, Beijing (CN)
Filed on Jan. 24, 2020, as Appl. No. 16/751,731.
Claims priority of application No. 201910098385.2 (CN), filed on Jan. 31, 2019.
Prior Publication US 2020/0346991 A1, Nov. 5, 2020
Int. Cl. C06B 21/00 (2006.01); B29C 35/08 (2006.01)
CPC C06B 21/0091 (2013.01) [B29C 35/08 (2013.01); C06B 21/0058 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method for reducing propellant curing residual stress by a high-energy acoustic beam, comprising the following steps:
a step S1, in which a propellant slurry is injected into a curing container so as to wait for the propellant slurry to start curing;
a step S2, in which when the propellant slurry starts curing, a high-energy acoustic beam generator and a high-energy acoustic beam transducer are actuated to continuously emit a high-energy acoustic beam sensitive to stress and having a high-frequency and small-amplitude to the propellant slurry in the curing container to until the propellant slurry is cured to form a propellant grain, wherein the high-energy acoustic beam sensitive to stress and having high-frequency and small-amplitude makes particles of the propellant slurry more compact, improves a leveling property of a surface of the propellant slurry and facilitates escaping of air in the propellant slurry, so as to improve mechanical properties and stability of the propellant slurry, make the propellant slurry reduce or prevent forming of the internal residual stress, and eliminate the residual stress inside the propellant; and
a step S3, in which the high-energy acoustic beam generator and the high-energy acoustic beam transducer are closed.