926 resultados para Fluid mechanics - Data processing


Relevância:

100.00% 100.00%

Publicador:

Resumo:

Field measurements of salinity, wind and river discharge and numerical simulations of hydrodynamics from 1978 to 1984 are used to investigate the dynamics of the buoyant plume off the Pearl River Estuary (PRE), China during summer. The studies have shown that there are four major horizontal buoyant plume types in summer: Offshore Bulge Spreading (Type I), West Alongshore Spreading (Type II), East Offshore Spreading (Type III), and Symmetrical Alongshore Spreading (Type IV). River mouth conditions, winds and ambient coastal currents have inter-influences to the transport processes of the buoyant plume. It is found that all of the four types are surface-advected plumes by analysing the vertical characteristic of the plumes, and the monthly variations of the river discharge affect the plume size dominantly. The correlation coefficient between the PRE plume size and the river discharge reaches 0.85 during the high river discharge season. A wind strength index has been introduced to examine the wind effect. It is confirmed that winds play a significant role in forming the plume morphology. The alongshore wind stress and the coastal currents determine the alongshore plume spreading. The impact of the ambient currents such as Dongsha Current and South China Sea (SCS) Warm Current on the plume off the shelf has also assessed. The present study has demonstrated that both the river discharge and wind conditions affect the plume evolution.

Relevância:

100.00% 100.00%

Publicador:

Resumo:

首先应用Visual Basic 6.0计算机语言,根据我们所熟知的海洋重力数据的处理步骤和海洋重力测量规范内容,开发出一套海洋重力资料整理软件,以便能使资料整理工作成为一体化,提高工作效率,保证数据处理的准确性。应用该软件对南海某工区的实际重力资料进行了处理,得到了满意的处理结果,证明该软件使用方便,计算准确可靠,能够快速准确的处理采集到的重力数据。对数据处理结果进行了分析和应用。 通过分析Eötvös校正值与重力仪读数之间的变化关系,可以对重力仪的动态性能进行分析和评价。得到2级海况条件下重力仪的实际阻尼延迟时间约为60s,比厂方推荐的理论值(110s)更接近实际,有助于减小数据处理过程中的定位误差,提高测量精确度。通过对重力仪的灵敏性进行分析,验证重力仪在测量过程中的准确性和可靠性,为获得精确的数据提供可靠的保障。 对该套规则重力测网数据,分别采用60s阻尼延迟时间和110s阻尼延迟时间进行阻尼延迟校正,然后进行交点差计算和平差处理,得到的结果显示:采用60s阻尼延迟时间对数据进行阻尼延迟校正后得到的测量精度为1.40mGal,经过平差后的测量精度为0.77mGal;而采用110s阻尼延迟时间对数据进行阻尼延迟校正后得到的测量精度为1.62mGal,经过平差后的测量精度为0.96mGal。此结果验证了利用船只机动转向法确定海洋重力仪的实际阻尼延迟时间的必要性和应用价值。 最后,对宋文尧等人的平差方法和刘保华等人的最小二乘平差方法进行了分析比较,从推导原理和计算结果两方面证明了两种方法在规则海洋重力测网平差作用上是等效的。对于不规则重力测网平差,最小二乘平差方法具有强大的优势,且计算机程序运算实现方便。

Relevância:

100.00% 100.00%

Publicador:

Resumo:

本文在分析几种常用的基于编码器测速方法的基础上,提出了一种高性能的自适应速度测量方法。该方法选择一个可变的时间周期和编码器脉冲数来测量单位时间内的编码器脉冲数,再通过简单的计算得到转速的测量值。数字信号处理器(DSP)芯片集成有正交脉冲编码电路,并且数据处理速度快,实时性强。本文中提出的方法在电机控制专用DSP芯片TMS320 LF2407A上进行了实现。实验研究表明,可以在提高低速时的测速准确度的同时,提高系统的响应时间。该方法已经在自主研发的全数字伺服驱动系统中得到了成功应用。

Relevância:

100.00% 100.00%

Publicador:

Resumo:

提出了一种基于扩展集员估计(ESMF)的多机器人协作观测方法,该方法将多机器人之间的观测数据融合过程嵌入到估计过程当中,从而减少了数据处理的过程,增强了算法的快速性。同时,这种方法在实现协作观测时只需要协作机器人传送观测信息而不是整个的估计信息,因此可以减轻多机器人系统的通信负担。除此之外,该方法在融合多机器人的观测数据过程中避免了多余的近似过程,增加了观测的准确性。最后,给出了三维环境下的仿真结果,验证了方法的可行性。

Relevância:

100.00% 100.00%

Publicador:

Resumo:

针对废墟搜救机器人的实际需要和当前监控终端的不足,设计开发了一种新的监控终端。这种监控终端基于OMAP架构,包含了人机界面、遥控、无线通讯、数据处理等功能,实现了对机器人本体的无线操控,并实现了与指挥中心的远程无线连接。由于在功耗与性能之间取得了平衡,这种监控终端减小了体积,提高了便携性。

Relevância:

100.00% 100.00%

Publicador:

Resumo:

设计制作了一种基于多处理器的移动机器人分布式超声环境探测系统.该系统由上位工作模式控制模块和下位智能超声传感器阵列组成.下位智能超声传感器选用收发一体式超声传感器,每个传感器均由独立的微处理器控制,完成实时数据处理、抗干扰处理、故障报警以及并行数据通信等功能.上位工作模式控制模块可以根据不同的控制策略,使下位传感器阵列采用“阈值比较法”和“改进型递推均值滤波”算法及EERUF方法并行循环工作模式,实现不同方向传感器分组并行工作,提高了探测的实时性和准确性,以及对移动机器人控制的鲁棒性.仿真和实验的结果都验证了该系统的可靠性和有效性.

Relevância:

100.00% 100.00%

Publicador:

Resumo:

设计了一种基于多微处理器的智能超声探测系统。该系统采用由上位工作模式控制单元和下位智能超声传感器阵列组成的分布式结构。每个超声传感器均由独立的微处理器控制,并完成实时数据处理、抗干扰处理、故障报警以及数据通信等功能。上位控制单元根据移动机器人的运动状态采用不同的控制策略,使下位传感器阵列分组并行工作,提高了探测系统的实时性;下位传感器采用"阈值比较法"、"改进型递推均值滤波"算法和模糊信息处理技术,提高了探测系统的准确性、可靠性。将该探测系统安装于RIRA-II移动机器人上,进行了基于主动视觉和超声信息的运动目标跟踪实验,实验表明超声探测系统运行可靠、稳定。

Relevância:

100.00% 100.00%

Publicador:

Resumo:

根据心理物理学、神经生理学、认知神经学等学科在视觉认知领域的部分研究成果,结合机器视觉、图像处理领域在图像增强方面已经提出的一些方法,提出了结合先验知识的多窗口结构下的分块中值滤波方法,在每一个窗口内单独进行处理与分析,突出了视觉处理目的,减少了运算量, 节省数据存储空间,达到了令人满意的滤波效果,能够在原始图像比较复杂的情况下,较好地对其进行预处理,可以改善、提高后期图像处理过程,如图像分割、图像分析的正确性和有效性。

Relevância:

100.00% 100.00%

Publicador:

Resumo:

介绍了一种微型遥控潜水器视频监控系统,包括硬件装置及基于软件技术的视频数据处理技术。硬件装置完成视频信号的采集、传输、显示。视频数据处理技术解决了视频信号的捕获、存储、画面质量调节等。该系统已经在微型遥控潜水器中应用,效果良好。

Relevância:

100.00% 100.00%

Publicador:

Resumo:

具有自主的全局定位能力是自主式移动机器人传感器系统的一项重要功能 .为了实现这个目的 ,国内外均在不断地研究发展各种定位传感器系统 .这里介绍了一种采用光学原理的全方位位置传感器系统 .该传感器系统由主动式路标、视觉传感器、图象采集与数据处理系统组成 .其视觉传感器和数据处理系统可安装在移动机器人上 ,然后可通过观测路标和视角定位的方法 ,计算出机器人在世界坐标系中的位置和方向 .实验证明 ,该系统可以实现机器人的在线定位 ,其采样速率和精度能够满足实用要求 .

Relevância:

100.00% 100.00%

Publicador:

Resumo:

本文介绍了一个基于 PSD 的机器人动态位置测量系统,描述了系统的构成,并对该系统中的标定方法,数据处理方法和为提高系统的性能所采取的硬件措施进行探讨,本系统通过长期考机和初步应用,表明了它具有良好的可靠性和有效性.

Relevância:

100.00% 100.00%

Publicador:

Resumo:

本文介绍用光学阵列传感器的机器人物体分类系统。传感器直接安装在机器人的两个手指上。被抓物体的阴影通过光导纤维传到安放在“安全区”的光敏元件上。计算机识别物体的轮廓后命令机器人抓握物体,并把它运送到指定的地点从而达到物体分类的目的。

Relevância:

100.00% 100.00%

Publicador:

Resumo:

本文主要介绍用于图象数据处理的 CCD-微机系统。该系统使用电荷耦合器件(CCD)作为传感器,并与微型计算机连接,进行图象数据的采集和处理。系统还包括有光学系统、CCD 驱动控制线路、计算机 I/O 接口和应用软件。数据采集程序用汇编语言编写,数据处理和打印程序用 BASIC 语言编写,整个软件用BASIC 语言编写的程序管理。应用该系统曾对静止和运动物体尺寸进行过非接触测量,重复性很好。

Relevância:

100.00% 100.00%

Publicador:

Resumo:

在研究快速傅里叶变换(FFT)算法的基础上,根据FPGA性能高、灵活性强、速度快的特点,提出了高效的基4-FFT处理器的实现方法。数据存储采用分块存储的方法,大大提高了存取速度。数据寻址采用新型的地址产生方法,可并行产生所需数据地址。同时,在蝶形单元的设计中很好的将并行运算技术和流水线技术相结合了起来,又进一步提高了运算速度。测试结果表明,时钟在50MHz时完成1024点FFT的时间为25.6μs,满足了应用实时性的要求。

Relevância:

100.00% 100.00%

Publicador:

Resumo:

With the Oil field exploration and exploitation, the problem of supervention and enhaning combination gas recovery was faced.then proposing new and higher demands to precision of seismic data. On the basis of studying exploration status,resource potential,and quality of 3D seismic data to internal representative mature Oil field, taking shengli field ken71 zone as study object, this paper takes advantage of high-density 3D seismic technique to solving the complex geologic problem in exploration and development of mature region, deep into researching the acquisition, processing of high-density 3D seismic data. This disseration study the function of routine 3D seismic, high-density 3D seismic, 3D VSP seismic,and multi-wave multi-component seismic to solving the geologic problem in exploration and development of mature region,particular introduce the advantage and shortage of high-density 3D seismic exploration, put forward the integrated study method of giving priority to high-density 3D seismic and combining other seismic data in enhancing exploration accuracy of mature region. On the basis of detailedly studying acquisition method of high-density 3D seismic and 3D VSP seismic,aming at developing physical simulation and numeical simulation to designing and optimizing observation system. Optimizing “four combination” whole acquisition method of acquisition of well with ground seimic and “three synchron”technique, realizing acquisition of combining P-wave with S-wave, acquisition of combining digit geophone with simulation geophone, acquisition of 3D VSP seismic with ground seimic, acquisition of combining interborehole seismic,implementing synchron acceptance of aboveground equipment and downhole instrument, common use and synchron acceptance of 3D VSP and ground shots, synchron acquisition of high-density P-wave and high-density multi-wave, achieve high quality magnanimity seismic data. On the basis of detailedly analysising the simulation geophone data of high-density acquisition ,adopting pertinency processing technique to protecting amplitude,studying the justice matching of S/N and resolution to improving resolution of seismic profile ,using poststack series connection migration,prestack time migration and prestack depth migration to putting up high precision imaging,gained reliable high resolution data.At the same time carrying along high accuracy exploration to high-density digit geophone data, obtaining good improve in its resolution, fidelity, break point clear degree, interbed information, formation characteristics and so on.Comparing processing results ,we may see simulation geophone high-density acquisition and high precision imaging can enhancing resolution, high-density seismic basing on digit geophone can better solve subsurface geology problem. At the same time, fine processing converted wave of synchron acquisition and 3D VSP seismic data,acquiring good result. On the basis of high-density seismic data acquisition and high-density seismic data processing, carry through high precision structure interpretation and inversion, and preliminary interpretation analysis to 3D VSP seismic data and multi-wave multi-component seismic data. High precision interpretation indicates after high resolution processing ,structural diagram obtaining from high-density seismic data better accord with true geoligy situation.