搜索结果: 61-75 共查到“知识库 空气动力学”相关记录531条 . 查询时间(5.681 秒)
基于BP神经网络的风洞传感器非线性误差修正方法
BP神经网络 风洞传感器 误差修正
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2016/5/25
针对风洞试验时传感器测值受到非线性误差干扰的问题,提出基于BP神经网络的风洞传感器非线性误差修正方法。利用BP神经网络强大的非线性映射能力,通过神经网络模型融合传感器校准数据对传感器的测量误差进行计算,并根据网络计算误差对传感器测值进行修正。试验结果表明,该方法能有效地减小非线性误差对传感器测值的影响,提高传感器的测量精度。
SolidWorks二次开发技术在风洞试验中的应用
SolidWorks 二次开发 轨迹捕获 运动仿真
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2016/10/12
针对风洞捕获轨迹试验中外挂物的位置和姿态角难以被直观观察的问题,建立一套基于SolidWorks 技术 的三维可视化系统。通过介绍开发环境和轨迹显示系统的总体结构,利用描述软件根据位姿信息对外挂物模型进行 位姿变换,并在运功分析的同时进行了动态模拟外挂物的运动,实现了运动分析的可视化仿真。仿真结果表明:该 系统可实现外挂物分离过程的实时显示,便于直观了解外挂物在投放过程中的位姿状态,对提高分析人员...
以动态混合网格技术为基础, 通过耦合求解刚体动力学方程、流体力学控制方程以及飞行控制律, 建立了适用于飞行器"虚拟飞行" 过程研究的一体化数值模拟技术. 通过典型的外挂物投放算例对流体力学控制方程/动力学方程的耦合算法进行了测试, 并对某导弹的姿态角控制过程、过载控制过程以及变马赫数条件下的控制过程进行了数值模拟, 得到了与实验非常一致的结果. 这些算例证明该一体化算法已经初步具备了针对复杂飞行器...
基于Bently3500的风洞压缩机轴系监测系统
连续式风洞 透平压缩机 Bently3500 轴系监测
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2016/10/12
为准确监测0.6 m 连续式跨声速风洞压缩机轴系的径向振动、轴向位移和键相位信号,设计基于Bently3500 的轴系监测系统。采用Bently3500 机械保护系统进行硬件配置和参数组态,通过PLC 下位程序和上位机HMI 设计, 建立一套连续的在线轴系检测系统,并成功应用于压缩机运行和风洞调试。结果表明:系统能准确反映压缩机轴系 的实时运行状态,实现轴系关键运行参数的连续采集、在线监测和逻辑报...
一种基于虚拟总轴结构的多电机比例同步控制方法
虚拟总轴 伺服电机 电动缸 比例同步控制
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2016/10/12
针对现有基于虚轴原理的同步控制算法难以满足某些目标成型系统中比例同步控制要求的问题,设计了 一种基于虚拟总轴结构的多电机比例同步控制方法。介绍了多电机比例同步控制结构,并针对系统结构特点,以某 跨超声速风洞全挠性喷管型面控制系统为应用背景,设计了电机间比例同步系数分配算法,建立了4 台电动缸的同 步控制仿真模型。仿真实验结果表明:该控制方案收敛速度快,稳定性高,鲁棒性强,能很好地实现多电机的比例 ...
Computational Aerodynamics:Solvers and Shape Optimization
computational fl uid dynamics aerodynamics shape optimization
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2015/7/3
Aeronautics, and in particular aerodynamics, has been one of the main technological drivers for the development of computational fluid dynamics (CFD).
Towards Computational Flapping Wing Aerodynamics of Realistic Configurations using Spectral Difference Method
Towards Computational Flapping Wing Aerodynamics Realistic Confi gurations Spectral Diff erence Method
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2015/7/3
In this paper high-order high-fidelity simulations of unsteady flows over flapping wings are examined. The numerical framework for the present computational flapping wings anal...
Feedback Control of Aerodynamic Flows
Feedback Control Aerodynamic Flows
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2015/7/2
Every airplane has an associated external flow field that is extraordinarily rich in terms of its flow physics. It is intuitively obvious that the shape and configuration of th...
Application of the Time Spectral Method to Periodic Unsteady Vortex Shedding
Time Spectral Method Periodic Unsteady Vortex Shedding
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2015/7/2
The Time Spectral method has been proposed for the fast and efficient computation of periodic unsteady flows. The algorithm has been validated with both 2D and 3D test cases and applied suc...
Bodies having Minimum Pressure Drag in Supersonic Flow-Investigating Nonlinear Effects
Minimum Pressure Drag Supersonic Flow-Investigating Nonlinear Eff ects
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2015/7/2
One of the most interesting problems in supersonic aerodynamics has been to find profile shapes that have minimum pressure drag, subject to a set of geometric constraints.Considerable work...
Drag Prediction of the DLR-F6 Configuration
Drag Prediction DLR-F6 Configuration
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2015/7/2
Out of a host of experimental aerodynamic data available for the DLR-F6 configura tion a set of reference test cases has been chosen for the second AIAA drag prediction workshop.
SolidWorks二次开发技术在风洞试验中的应用
SolidWorks 二次开发 轨迹捕获 运动仿真
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2016/4/6
本文采用VB对SolidWorks建模软件进行二次开发,建立一套形象直观的风洞捕获轨迹试验三维可视化系统。用VB 对SolidWorks 二次开发的轨迹显示系统中,采用OLE自动化技术,把VB 编写的应用程序作为客户程序,把应用软件SolidWorks 作为服务程序,用客户程序驱动服务程序完成SolidWorks 相应的操作。显示软件根据位姿信息对外挂物模型进行位姿变换,从而在运功分析的同时动态模...
Select ADO-DG Case Studies in Aerodynamic Design Optimization
Aerodynamic Design Optimization Select ADO-DG
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2015/6/18
Select ADO-DG Case Studies in Aerodynamic Design Optimization。
Aerodynamic Inverse Design and Shape Optimization via Control Theory
via Control Theory Shape
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2015/6/18
Capability to predict the flow past an airplane in different flight regimes such as
take off, cruise, flutter.
2 Interactive design calculations to allow immediate improvement
3 A...
Airplane Design with Aerodynamic Shape Optimization
Shape Airplane Design
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2015/6/18
A light structure is needed to reduce W0. SFC is the province of the
engine manufacturers. The aerodynamic designer should try to maximize
VL
D
. This means the cruising speed V should be increase...