Design， Mechanical Characteristics Analysis， and Testing of a Flexible Wedge-Block Mechanism for Aircraft Hatch Connection

doi:10.3969/j.issn.1004-132X.2025.11.024

Abstract

Abstract:

Aiming at the shortcomings of the traditional connection methods for aircraft access panels， such as low maintenance efficiency and poor reusability， a wedge mechanism which is composed of a flexible wedge block and a wedge groove was designed. The engagement and disengagement of the wedge-block mechanism were achieved by preload force generated from the cooperation between the hinge rotation of flexible wedge block and the wedge groove， and the threaded holes of different diameters on the flexible wedge block and the wedge groove. The pseudo-rigid body method and integral method were adopted to establish the deformation model and mechanical model， and the mechanical characteristics of key design parameters were analyzed. Simulation and physical tests show that the wedge mechanism has the ability to resist loosening and disengagement under medium and low-frequency working conditions.

Key words: hatch connection, wedge-block mechanism, flexible hinge, pseudo-rigid-body model, finite element simulation

摘要：

针对飞行器口盖传统连接方式维修效率低、可重复使用性差等缺点，设计了一种由柔性楔形块和楔形槽组成的楔块机构，利用柔性楔形块铰链转动与楔形槽配合产生的预紧力，以及柔性楔形块和楔形槽上不同直径的螺纹孔实现楔块机构的结合和分离。采用伪刚体法和积分法建立了变形模型与力学模型，并对关键设计参数进行了力学特性分析。仿真和实物试验表明，楔块机构在中低频工况下具有抗松动和抗分离的能力。

关键词: 口盖连接, 楔块机构, 柔性铰链, 伪刚体模型, 有限元仿真

CLC Number:

TH122

Hongji YANG, Jie CHEN, Zhuoran LI, Yunhao ZHAO, Jing ZHAO. Design， Mechanical Characteristics Analysis， and Testing of a Flexible Wedge-Block Mechanism for Aircraft Hatch Connection[J]. China Mechanical Engineering, 2025, 36(11): 2670-2677.

杨洪基, 陈杰, 李卓然, 赵昀皓, 赵京. 一种飞行器口盖连接的柔性楔块机构设计与力特性分析及试验[J]. 中国机械工程, 2025, 36(11): 2670-2677.

Figures/Tables 17

Fig.1 Flexible wedge block

Fig.2 Wedge mechanism schematic diagram

Fig.3 Wedge mechanism assembly principle

Fig.4 Wedge mechanism-hatch cover installation position diagram

Fig.5 Deformation model of the free end of the flexible wedge block

Fig.6 Mechanical model of the flexible wedge block under arbitrary pressing position

Fig.7 Mechanical characteristics diagram of structural parameters and deformation amount of flexible wedge block

Fig.8 Characteristic diagram of the influence of key parameters of wedge mechanism on the magnitude of preload force

Fig.9 Force amplification ratio coefficient characteristics diagram

Fig.10 Analytical and simulation solutions for free end deformation

Fig.11 Analytical solutions and simulation solutions of preload force with different friction coefficients

Fig.12 Results of vibration simulation of wedge mechanism

Fig.13 Vibration test of the wedge mechanism

Fig.14 Shell vibration simulation test results

Fig.15 Test platform

Table.1 External excitation parameters

试验组号	频率/Hz	振幅/mm	加速度/g
试验1	10	1.15	0.37
试验2	20	1.14	1.64
试验3	20	1.24	1.78
试验4、5	30	1.13	4.05

Fig.16 Strain under vibration conditions

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