Mechanical model of locking mechanisms of folding wing for spacecraft
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摘要:
针对折叠翼插-拔式锁紧机构建模问题,采用平面应变假设和叠加原理对模型简化降维,构建了考虑间隙效应的连接刚度解析模型。首先,采用能量法求解接触摩擦引起的非静定问题,获得法向和切向接触力;其次,基于Hertz基本解计算出等效接触刚度,并采用梁模型计算弹性销的弯曲变形;通过将解析解与文献试验值进行对比,对方法的适用性进行验证,并进一步针对不同接触模式开展参数影响分析,最终给出了载荷和间隙对连接刚度的影响规律。结果表明:当载荷由20 N·m变为50 N·m时,锁紧机构的连接刚度增大约3%~5%,存在刚度渐硬非线性效应;而随间隙增大,连接刚度呈现下降趋势,其原因为配合尺寸影响弹性销与孔壁的相对姿态。
Abstract:To model the plug-in locking mechanism, the plane strain assumption and superposition principles were used for dimensionality reduction and simplification, and an analytical model of connection stiffness considering the effect of gap was established. Firstly, the energy method was used to solve the indeterminate problem caused by contact friction, and the normal and tangential contact forces were obtained. Then, the equivalent contact stiffness was calculated by using Hertz’s theory, and the bending deformation of elastic pins was calculated through beam model. To validate the applicability of the method, the analytical results were compared with the experimental results from the reference paper. Finally, the parameter influence analysis was carried out, and the effect of load and clearance on connection stiffness was proposed. The results showed that when the load changed from 20 N·m to 50 N·m, the connection stiffness of the locking mechanism increased by about 3%—5%, demonstrating a hardening spring nonlinear effect. With the increase of the clearance, the connection stiffness showed a downward trend, owing to the fact that the fit size affected the relative attitude of the elastic pin and the hole.
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Key words:
- folding wing /
- lock mechanisms /
- mechanical model /
- contact stiffness /
- semi-analytical method
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表 1 不同载荷下的支反力理论值与试验值
Table 1. Theoretical and experimental values of the support reaction force under different loads
η FR1 (Plad=111.13 N) FR1 (Plad=444.52 N) FR2 (Plad=111.13 N) FR2 (Plad=444.52 N) FR1T/N FR1E/N ε/% FR1T/N FR1E/N ε/% FR2T/ N FR2E/N ε/% FR2T/N FR2E/N ε/% 0.13 190.92 188.01 1.55 528.50 526.04 0.47 21.14 20.19 4.72 40.50 37.00 9.46 0.25 195.08 188.54 3.47 528.48 526.67 0.34 28.34 22.92 23.67 62.57 58.86 6.31 0.38 195.15 193.31 0.95 528.49 522.06 1.23 33.89 32.47 4.38 84.66 80.60 5.04 0.50 184.99 189.95 −2.61 501.04 520.52 −3.74 35.31 37.15 −4.96 95.65 106.12 −9.86 0.62 183.71 187.31 −1.92 528.59 516.84 2.27 40.31 37.50 7.50 128.86 121.87 5.74 0.75 182.24 188.50 −3.32 489.41 508.11 −3.68 45.24 47.62 −5.00 135.11 145.17 −6.93 表 2 三点接触时不同载荷和间隙下的连接刚度
Table 2. Connection stiffness under different loads and clearances for three-point contact type
N·m/rad M/(N·m) 间隙dc/mm 0.4 0.8 1.2 1.6 2.0 20 135793 134629 133371 132009 130537 23 136496 135328 134064 132697 131220 26 137119 135946 134677 133306 131825 29 137678 136501 135228 133853 132367 32 138185 137004 135728 134350 132860 35 138650 137466 136187 134805 133312 38 139079 137892 136609 135224 133728 41 139478 138288 137002 135614 134116 44 139850 138657 137369 135979 134477 47 140199 139004 137714 136321 134817 50 140528 139331 138038 136643 135136 表 3 四点接触时不同载荷和间隙下的连接刚度
Table 3. Connection stiffness under different loads and clearances for four-point contact type
N·m/rad M/(N·m) 间隙dc/mm 0.4 0.8 1.2 1.6 2.0 20 14027 13320 12493 11479 10171 23 14107 13419 12587 11590 10266 26 14215 13506 12680 11669 10345 29 14299 13580 12756 11750 10419 32 14371 13656 12824 11820 10486 35 14437 13722 12893 11883 10547 38 14498 13783 12954 11942 10603 41 14556 13840 13010 11997 10656 44 14609 13893 13062 12049 10705 47 14659 13943 13111 12097 10752 50 14707 13990 13158 12143 10796 -
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