共查询到20条相似文献,搜索用时 93 毫秒
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建立了振动切削中切削力的数学模型,进行振动切削中频率对切削力影响机理的研究,并通过数值模拟的方法,首次从理论上给出精密振动切削中频率对切削力的影响规律。同时,还研究了在不同的振动切削条件下,切削力随切削参数变化的变化规律。 相似文献
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插铣可降低径向切削力,减小工件变形,降低机床功率消耗,可实现难加工材料高效加工,其应用也越来越广泛。本课题针对沉淀硬化不锈钢PH13-8Mo的切削特点,搭建了切削力测试试验平台,采用正交方法设计了试验,运用多元线性回归方法对试验结果数据进行了拟合,建立了PH13-8Mo的插铣铣削力经验模型,对插铣铣削力随切削参数的变化规律进行了分析,并进行了试验验证,为研究沉淀硬化不锈钢的插铣过程提供了依据。 相似文献
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建立了适合任意进给方向的球头铣刀铣削力模型,并将铣削力仿真与几何仿真有机地结合起来,提出了快速准确地提取参与切削的切削微元的方法,并通过切削实验验证了铣削力模型。 相似文献
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最佳非等距线性插值基点选取法 总被引:1,自引:0,他引:1
本文探讨了一种最佳的非等距线性插值基点选取法。采用这种方法,可以使给定允许插值误差情况下,插值基点数减到最少,从而使一些专用微机系统中所要求的表格存贮器的容量大大减少,插值搜索过程加快。 相似文献
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基于加速度计和角速率陀螺的超小无人直升机姿态控制系统 总被引:1,自引:0,他引:1
设计了一种基于加速度计和角速率陀螺的超小型无人直升机姿态控制系统;由卡尔曼滤波算法融合加速度计和陀螺数据,实时估计最优的直升机姿态信号;根据最优的姿态反馈信号,飞行控制系统采用参数自整定的模糊PID控制方法得到舵机控制信号,从而实现了超小型无人直升机的姿态控制。 相似文献
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An automatic data processing system for the evaluation of statistically occurring Doppler-difference bursts is described. In addition to the higher accuracy compared with the data acquisition procedures known so far, this technique allows the Doppler-difference method to be used as an operational instrument for investigations into turbulent flows, especially in the case of low particle density and extremely small turbulence degrees. 相似文献
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《中国航空学报》2017,(6)
An environment control and life support system(ECLSS) is an important system in a space station. The ECLSS is a typical complex system, and the real-time simulation technology can help to accelerate its research process by using distributed hardware in a loop simulation system. An implicit fixed time step numerical integration method is recommended for a real-time simulation system with time-varying parameters. However, its computational efficiency is too low to satisfy the real-time data interaction, especially for the complex ECLSS system running on a PC cluster. The instability problem of an explicit method strongly limits its application in the ECLSS real-time simulation although it has a high computational efficiency. This paper proposes an improved numerical simulation method to overcome the instability problem based on the explicit Euler method. A temperature and humidity control subsystem(THCS) is firstly established, and its numerical stability is analyzed by using the eigenvalue estimation theory. Furthermore, an adaptive operator is proposed to avoid the potential instability problem. The stability and accuracy of the proposed method are investigated carefully. Simulation results show that this proposed method can provide a good way for some complex time-variant systems to run their real-time simulation on a PC cluster. 相似文献
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LTPB接口控制文件ICD的有效性判定 总被引:1,自引:0,他引:1
ICD文件反映了电子综合系统的数据流特征,保证航电系统综合成功的一个要素是数据流完整、实时的传输。介绍了接口控制文件ICD的制定方法。从网络协议、消息参数出发,对网络传输特性进行了深入研究,在给出合理的网络参数设置方法的基础上,提出了ICD文件定义的数据流完整、实时传输的充要条件和工程实用的判定方法。 相似文献