排序方式: 共有31条查询结果,搜索用时 171 毫秒
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在低频电缆网导通绝缘测试中,对电缆网连接节点的划分是开展低频电缆网测试的基础。通过电缆网连接节点的划分,可以高效低成本完成转接电缆和测试方案的设计,将能够大大节省电缆网性能测试的周期和成本,为工程项目任务中电缆网快速、高效、准确测试奠定基础。目前,对电缆网的测试一般直接通过连接器进行转接电缆设计,这种方法由于转接电缆连接器芯点分配的问题,导致测试效率较低。针对以上问题,提出改进型的转接电缆设计方法,并针对改进型设计方法中子网络难划分的痛点问题,采用基于拉普拉斯矩阵的网络社区划分算法完成电缆网相关性大的子网络的划分。该方法解决了节点多、关联性强的电缆网子网络划分问题,经过仿真验证,使用划分后设计的转接电缆进行电缆网测试,测试效率得到提升。 相似文献
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《中国航空学报》2021,34(12):214-226
In the aviation industry, cable bracket is one of the most common parts. The traditional assembly state inspection method of cable bracket is to manually compare by viewing 3D models. The purpose of this paper is to address the problem of inefficiency of traditional inspection method. In order to solve the problem that machine learning algorithm requires large dataset and manually labeling of dataset is a laborious and time-consuming task, a simulation platform is developed to automatically generate synthetic realistic brackets images with pixel-level annotations based on 3D digital mock-up. In order to obtain accurate shapes of brackets from 2D image, a brackets recognizer based on Mask R-CNN is trained. In addition, a semi-automatic cable bracket inspection method is proposed. With this method, the inspector can easily obtain the inspection result only by taking a picture with a portable device, such as augmented reality (AR) glasses. The inspection task will be automatically executed via bracket recognition and matching. The experimental result shows that the proposed method for automatically labeling dataset is valid and the proposed cable bracket inspection method can effectively inspect cable bracket in the aircraft. Finally, a prototype system based on client-server framework has been developed for validation purpose. 相似文献
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针对环柱式天线展开过程中斜拉绳索释放运动与桁架展开运动之间耦合动力学分析困难的问题,采用非线性欧拉梁单元对斜拉绳索建模,基于几何精确梁理论对环形桁架建模,提出了环柱式天线多体系统模型,实现了结构展开过程中绳索释放与桁架展开耦合动力学的精准仿真,揭示了绳索柔性等因素对桁架伸展起阻碍作用的机理。仿真结果表明,在环柱式天线展开过程中,减小绳索模量,降低绳索直径,采用单绳索分布设计,有利于提高桁架的展开稳定性。另外,绳索柔性对桁架展开中间阶段影响最为显著。该分析结果为环柱式天线在轨展开动力学预示和优化设计提供了指导作用。 相似文献
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简述了毫米波柔性电缆组件的设计,给出了自行研制的2.4mm连接器柔性电缆组件在(26.5~36)GHz频率范围内电压驻波比、插入损耗等的测试结果。表明其达到了预期的技术指标。 相似文献
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文中提出了一种配接SMA型射频同轴连接器的电缆组件。通过共面补偿优化设计以及对装配过程中影响电缆组件电性能指标的关键因素进行分析,设计了SMA型射频连接器,并配接射频电缆加工了电缆组件。在整个工作频段(0.01~18)GHz,测试的电缆组件电压驻波比VSWR电缆组件<1.12,通过计算,单个连接器电压驻波比VSWR连接器<1.06。所提出的配接SMA型射频连接器电缆组件的电压驻波比性能较常见的同类电缆组件有明显改进。电缆组件的测试结果与仿真结果具有较好的一致性,验证了设计的有效性。 相似文献
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本文较详细的介绍电缆自动充气机控制系统的组成及工作原理,重点论述压力、湿度传感器的调理电路,并给出系统工作的主程序。 相似文献
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《中国航空学报》2023,36(2):58-75
A four-cable mount system is proposed for full-model wind tunnel flutter tests, which may adjust the pitch and roll attitude of the aircraft scaled model and ensure that the model is not subjected to cable tension. The system provides sufficient support to simulate the free flight of the aircraft by applying appropriate spring stiffness and cable tensions. The proposed four-cable mount system is modeled based on Lagrange mechanics, and its dynamics equations consider aerodynamic effects. The singularity of the system and its bifurcation characteristics under flow conditions are analysed to determine the supercritical bifurcation phenomenon for different tension levels and distances from the front suspension point to the mass centre of the model. The mathematical expressions of the longitudinal flight stability of the cable mount system are derived by linearising the system dynamics equations using small perturbations. The influence of the cable tension, spring stiffness, suspension point position, and other factors on the flight stability of the aircraft are analysed. A feedforward control algorithm is proposed to minimize the total elastic potential energy of the system. The results show that the model is in the level flight state when the elastic potential energy of the four-cable mount system is minimized. A feedback control design method is proposed based on the Lyapunov stability theory to derive the closed-loop stability conditions. The system dynamics model that includes the aircraft rigid body model, flexible cables, pulleys, springs, aerodynamic model, and servo motor control is established using the flexible multibody dynamics method. A multibody dynamics solver and Simulink are used to simulate the attitude adjustment of the model in the wind tunnel and verify the supercritical bifurcation characteristics of the system and the effectiveness of the feedback and feedforward control. 相似文献