Frequency Domain Analysis of Fluid–Structure Interaction in Aircraft Hydraulic Pipe with Complex Constraints

Gao, Haihai; Guo, Chao; Quan, Lingxiao; Wang, Shuai

doi:10.3390/pr10061161

Cited by 6 publications

(1 citation statement)

References 34 publications

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“…The pipe forces are mainly composed of inertial force, axial internal and external force on the pipe wall, friction between the pipe wall and fluid, fluid pressure, and gravity. Fourteen system variables in the fourteen-equation model can be written as a state vector [27]:…”

Section: Force Analysis and Dynamic Modeling Of Single-layer Flexible...mentioning

confidence: 99%

Dynamic Modeling and Parameter Identification of Double Casing Joints for Aircraft Fuel Pipelines

Quan,

Fu,

Yao

et al. 2023

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Double casing joints are flexible pipe joints used for connecting aircraft fuel pipelines, which can compensate for the displacement and corner of the connected pipes and have complex mechanical characteristics. However, it is difficult to use sensors to directly measure the mechanical connection parameters of flexible joints. In this paper, we construct a coupling dynamics model and parameter identification of a double casing joint. Firstly, we analyze the structure and working principle of double-layer casing joints and establish the dynamics model of a single-layer flexible joint based on the transfer matrix method. Then, we deduce the coupling matrix of the inner and outer pipeline according to the deformation coordination conditions combined with matrix dimension extension. We establish the coupling dynamics model of flow–solid coupling of double casing joints. Furthermore, parameters such as equivalent stiffness and damping of each motion of the double casing joint in the casing unit are identified using the force-state mapping (FSM) method, and an analytical solution in the frequency domain under hammering excitation is given by the dynamics model. Finally, the dynamics test bench of the double casing joint for aircraft fuel is set up, and the free mode test of the double casing joint assembly is carried out. The results show that under free boundary hammering excitation, the theoretical and experimental frequency-domain response results are well matched, both obtaining seven main resonance peaks, and the maximum error is 9.45%, which shows the validity of the pipeline dynamics modeling method with a double casing joint.

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Section: Force Analysis and Dynamic Modeling Of Single-layer Flexible...mentioning

confidence: 99%