The hose-drogue system is a common method for soft aerial refueling,whereby the refueling tanker tows the drogue through the hose.In this paper,a mathematical-physical model of the hose-drogue system is developed and ...The hose-drogue system is a common method for soft aerial refueling,whereby the refueling tanker tows the drogue through the hose.In this paper,a mathematical-physical model of the hose-drogue system is developed and simulated using the Absolute Nodal Coordinate Formulation(ANCF)finite element method.A numerical solution program based on ANCF and ALE(Arbitrary Eulerian-Lagrange)-ANCF method was developed to simulate and analyze the horizontal and elongation release processes of the hose-drogue system at different towing points(underneath the wing and the belly of the aircraft).This program was developed by introducing an ALE description.The numerical solution program,developed based on the ANCF and ALE-ANCF methods,represents a significant advancement in computational efficiency for the rigid-flexible coupled multibody system of the air refueling hose-drogue system.This program can provide a valuable reference for the qualitative design of the hose-drogue multibody system in soft air refueling,while maintaining the necessary accuracy.展开更多
为了探究子午线轮胎面内振动特性,建立了旋转超弹性厚壁REF模型。并在具有随动坐标系的绝对节点坐标法(absolute nodal coordinate formulation,ANCF)框架下,提出平面内旋转环扇单元,对旋转超弹性厚壁弹性基环模型(ring on the elastic ...为了探究子午线轮胎面内振动特性,建立了旋转超弹性厚壁REF模型。并在具有随动坐标系的绝对节点坐标法(absolute nodal coordinate formulation,ANCF)框架下,提出平面内旋转环扇单元,对旋转超弹性厚壁弹性基环模型(ring on the elastic foundation,REF)进行离散。考虑到非线性本构关系和旋转运动中的广义惯性力,建立了该模型的非线性运动微分方程以及线性化运动微分方程。通过与现有文献中的试验结果进行对比,验证了上述模型的有效性,并分析了弹性基参数、环体厚度和旋转角速度对子午线轮胎固有特性的影响规律。展开更多
The integrated systems of unmanned surface vehicles(USVs) and remotely operated vehicles(ROVs) have been extensively applied in marine exploration and seabed coverage. However, the simultaneous navigation of USV-ROV s...The integrated systems of unmanned surface vehicles(USVs) and remotely operated vehicles(ROVs) have been extensively applied in marine exploration and seabed coverage. However, the simultaneous navigation of USV-ROV systems is frequently limited by strong disturbances induced by waves or currents. This paper develops a novel rigidflexible coupling multibody dynamic model that incorporates disturbances of variable-length marine cables with geometrically nonlinear motion. A hybrid Lagrangian-Eulerian absolute nodal coordinate formulation(ANCF) element is developed to accurately model subsea cables which undergo significant overall motion, substantial deformation,and mass flow during the deployment of underwater equipment. Furthermore, the governing equations of the coupled USV-umbilical-ROV system are derived, considering wave-induced forces and current disturbances. A numerical solver based on the Newmark-beta method is proposed, along with an adaptive meshing technique near the release point. After validating three experimental cases, the cable disturbances at both the USV and ROV ends—caused by ocean currents, heave motion, and simultaneous navigation—are comprehensively compared and evaluated. Finally,it is demonstrated that a PD controller with disturbance compensation can enhance the simultaneous navigation performance of USV-ROV systems.展开更多
Research on pipe dynamics primarily focuses on in-plane vibration.However,pipes simultaneously experience in-plane and out-of-plane vibrations.Therefore,a three-dimensional dynamic model using the absolute nodal coord...Research on pipe dynamics primarily focuses on in-plane vibration.However,pipes simultaneously experience in-plane and out-of-plane vibrations.Therefore,a three-dimensional dynamic model using the absolute nodal coordinate formulation(ANCF)method is established and the dynamic characteristics of a planar L-shaped pipe are analyzed.Firstly,the dynamic equations of the pipe element are derived,and then the overall equations of the pipe model are composed by matrix assembly.By solving equations,it is found that static deformation caused by fluid velocity occurs in the plane,with larger deformations at higher fluid velocities.Additionally,the study observes coupling between different modes and variations in modal shapes.Variations in arc segment structural parameters result in non-uniform changes in natural frequencies,with out-of-plane vibration presenting even more complexity,and the results are verified by ANSYS simulation.Subsequently,a comparison between experimental and theoretical results is conducted across three sets of structural parameters,the consistency between these results validates the engineering significance of the theoretical model.展开更多
基金the support from the National Natural Science Foundation of China(No.52472384)the Fundamental Research Funds for the Central Universities,China(No.G2024KY0615)+1 种基金sponsored by the Foundations of National Key Laboratory of Unmanned Aerial Vehicle Technology in NPU,(No.WR202411-2)the National Key Laboratory of Aircraft Configuration Design,China(No.JBGS-2024-01)。
文摘The hose-drogue system is a common method for soft aerial refueling,whereby the refueling tanker tows the drogue through the hose.In this paper,a mathematical-physical model of the hose-drogue system is developed and simulated using the Absolute Nodal Coordinate Formulation(ANCF)finite element method.A numerical solution program based on ANCF and ALE(Arbitrary Eulerian-Lagrange)-ANCF method was developed to simulate and analyze the horizontal and elongation release processes of the hose-drogue system at different towing points(underneath the wing and the belly of the aircraft).This program was developed by introducing an ALE description.The numerical solution program,developed based on the ANCF and ALE-ANCF methods,represents a significant advancement in computational efficiency for the rigid-flexible coupled multibody system of the air refueling hose-drogue system.This program can provide a valuable reference for the qualitative design of the hose-drogue multibody system in soft air refueling,while maintaining the necessary accuracy.
文摘为了探究子午线轮胎面内振动特性,建立了旋转超弹性厚壁REF模型。并在具有随动坐标系的绝对节点坐标法(absolute nodal coordinate formulation,ANCF)框架下,提出平面内旋转环扇单元,对旋转超弹性厚壁弹性基环模型(ring on the elastic foundation,REF)进行离散。考虑到非线性本构关系和旋转运动中的广义惯性力,建立了该模型的非线性运动微分方程以及线性化运动微分方程。通过与现有文献中的试验结果进行对比,验证了上述模型的有效性,并分析了弹性基参数、环体厚度和旋转角速度对子午线轮胎固有特性的影响规律。
文摘基于ANCF梁单元建立架空接触网OCL的非线性有限元模型,模拟在20 m/s风速下不同参数OCL的舞动响应,分析不同跨距参数和线索张力对舞动抑制的影响,并通过均方根值量化跨距及张力变化对OCL舞动的抑制作用。研究结果显示,在250 m测试锚段中,采用6跨分布并将张力设置为17 k N的最佳参数配置,在减小风舞动影响的同时还具有经济性优势。此外,采用中间短两边长的跨距分布方式相比传统等跨距结构亦有一定优化效果。
基金financially supported in part by the General Program of the National Natural Science Foundation of China (Grant No.12272221)the State Key Laboratory of Ocean Engineering (Shanghai Jiao Tong University)(Grant No. GKZD010087)。
文摘The integrated systems of unmanned surface vehicles(USVs) and remotely operated vehicles(ROVs) have been extensively applied in marine exploration and seabed coverage. However, the simultaneous navigation of USV-ROV systems is frequently limited by strong disturbances induced by waves or currents. This paper develops a novel rigidflexible coupling multibody dynamic model that incorporates disturbances of variable-length marine cables with geometrically nonlinear motion. A hybrid Lagrangian-Eulerian absolute nodal coordinate formulation(ANCF) element is developed to accurately model subsea cables which undergo significant overall motion, substantial deformation,and mass flow during the deployment of underwater equipment. Furthermore, the governing equations of the coupled USV-umbilical-ROV system are derived, considering wave-induced forces and current disturbances. A numerical solver based on the Newmark-beta method is proposed, along with an adaptive meshing technique near the release point. After validating three experimental cases, the cable disturbances at both the USV and ROV ends—caused by ocean currents, heave motion, and simultaneous navigation—are comprehensively compared and evaluated. Finally,it is demonstrated that a PD controller with disturbance compensation can enhance the simultaneous navigation performance of USV-ROV systems.
基金supported by the China National Funds for Distinguished Young Scholars(Grant No.12025204)the project of the National Natural Science Foundation of China(Grant No.12072181)the YEQISUN Joint Funds of the National Science Foundation of China(Grant No.U2341231).
文摘Research on pipe dynamics primarily focuses on in-plane vibration.However,pipes simultaneously experience in-plane and out-of-plane vibrations.Therefore,a three-dimensional dynamic model using the absolute nodal coordinate formulation(ANCF)method is established and the dynamic characteristics of a planar L-shaped pipe are analyzed.Firstly,the dynamic equations of the pipe element are derived,and then the overall equations of the pipe model are composed by matrix assembly.By solving equations,it is found that static deformation caused by fluid velocity occurs in the plane,with larger deformations at higher fluid velocities.Additionally,the study observes coupling between different modes and variations in modal shapes.Variations in arc segment structural parameters result in non-uniform changes in natural frequencies,with out-of-plane vibration presenting even more complexity,and the results are verified by ANSYS simulation.Subsequently,a comparison between experimental and theoretical results is conducted across three sets of structural parameters,the consistency between these results validates the engineering significance of the theoretical model.
