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基于逆反工程(RE)多数据点云的处理 被引量:11
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作者 刘常青 彭翔 +1 位作者 张宗华 胡小唐 《工程图学学报》 CSCD 2002年第4期33-39,共7页
在逆反工程中,获得的测量数据量一般比较大,怎样使这些巨大数据更适合CAD/CAM的后续处理,是逆反工程中着重研究的问题。笔者在实践的基础上,提出了综合利用过滤、分割、特征线的提取等方法进行大数据点云的处理,并对多视场得到的点云进... 在逆反工程中,获得的测量数据量一般比较大,怎样使这些巨大数据更适合CAD/CAM的后续处理,是逆反工程中着重研究的问题。笔者在实践的基础上,提出了综合利用过滤、分割、特征线的提取等方法进行大数据点云的处理,并对多视场得到的点云进行了成功的拟合,最后给出了一个实验。实验结果证明了方法的可行性和有效性。 展开更多
关键词 逆反工程 数据测量 数据分割 RE CAD模型 多数据点云处理 先进制造技术 CAM
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多点数据处理的设计与实现
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作者 李国 《中国民航学院学报》 2001年第4期35-39,52,共6页
通过电力资源调度模拟屏的设计,阐述了计算机应用领域中对多数据点处理所采用的专用串行总线,并对其中的关键部分作了详细的论述。
关键词 多数据点 专用串行总线 模拟屏 计算机应用 数据处理 设计
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Development of an automatic polishing system for aluminum wheel-hub surface 被引量:1
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作者 陈义 《Journal of Chongqing University》 CAS 2010年第2期93-99,共7页
To improve polishing quality and cope with the shortage of skilled workers for aluminum wheel-hub surface polishing, an automatic surface polishing system with hierarchical control based on the teaching-playback metho... To improve polishing quality and cope with the shortage of skilled workers for aluminum wheel-hub surface polishing, an automatic surface polishing system with hierarchical control based on the teaching-playback method was presented. Multi-axis cutter location data (CL data) were generated with the teaching method. First, a helical tool path and a flexible polishing tool were adopted to achieve high quality and high efficiency; next, the initial irregular data were processed into continuous polishing CL data. The important factor affecting polishing quality, namely the interpolation cycle in the multi-axis CL data was calculated based on a constant removal rate. Results from polishing experiments show that the quality of automatic machine polishing is better and stabler than manual polishing. 展开更多
关键词 aluminum wheel hub POLISHING multi-axis cutter location data TEACHING
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In-line spectroscopy combined with multivariate analysis methods for endpoint determination in column chromatographic adsorption processes for herbal medicine 被引量:3
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作者 Cheng Jiang Haibin Qu 《Acupuncture and Herbal Medicine》 2022年第4期253-260,共8页
Objective: In a chromatographic cycle, the adsorption process is a critical unit operation that has a significant impact on downstream processes and, ultimately, the quality of the final products. The development of a... Objective: In a chromatographic cycle, the adsorption process is a critical unit operation that has a significant impact on downstream processes and, ultimately, the quality of the final products. The development of a rapid method to determine the endpoints of adsorption processes in a large-scale manufacturing is of substantial importance for herbal medicine(HM) manufacturers.Methods: In this study, the adsorption of saponins on a macroporous resin column chromatograph, a critical unit operation in Panax notoginseng(Burkill) F.H.Chen injection manufacturing, was considered as an example. The evaluation results of in-line ultraviolet and visible spectra combined with various multivariate analysis methods, including the moving block standard deviation(MBSD), difference between the moving block average and the target spectrum(DMBA-TS), soft-independent modeling of class analogy(SIMCA), and partial least-squares discriminant analysis(PLS-DA), were compared.Results: MBSD was unsuitable for adsorption processes. The relative standard errors of prediction between the predicted and experimental endpoints were 13.2%, 4.67%, and 5.71% using DMBA-TS, SIMCA, and PLS-DA, respectively.Conclusions: Among the considered analysis methods, SIMCA and PLS-DA were more effective for endpoint determination. The results of this study provide a more comprehensive overview of the effectiveness of various multivariate analysis methods to facilitate the selection of the most suitable method. This study was also conducive to address the issues of the in-line detection of adsorption endpoints to guide practical HM manufacturing. 展开更多
关键词 Adsorption ENDPOINT Herbal medicine Multivariate analysis Ultraviolet and visible
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FPGA Based Wireless Multi-Node Transceiver and Monitoring System
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作者 Ozkan Akin ilker Basaran +2 位作者 Radosveta Sokullu lrfan Alan Kemal Biiytikkabasakal 《Journal of Mathematics and System Science》 2012年第1期53-57,共5页
In recent years the variety and complexity of Wireless Sensor Network (WSN) applications, the nodes and the functions they are expected to perform have increased immensely. This poses the question of reducing the ti... In recent years the variety and complexity of Wireless Sensor Network (WSN) applications, the nodes and the functions they are expected to perform have increased immensely. This poses the question of reducing the time from initial design of WSN applications to their implementation as a major research topic. RF communication programs for WSN nodes are generally written on microcontroller units (MCUs) for universal asynchronous receiver/transmitter (UART) data communication, however nowadays radio frequency (RF) designs based on field-programmable gate array (FPGA) have emerged as a very powerful alternative, due to their parallel data processing ability and software reconfigurability. In this paper, the authors present a prototype of a flexible multi-node transceiver and monitoring system. The prototype is designed for time-critical applications and can be also reconfigured for other applications like event tracking. The processing power of FPGA is combined with a simple communication protocol. The system consists of three major parts: wireless nodes, the FPGA and display used for visualization of data processing. The transmission protocol is based on preamble and synchronous data transmission, where the receiver adjusts the receiving baud rate in the range from min. 300 to max. 2400 bps. The most important contribution of this work is using the virtual PicoBlaze Soft-Core Processor for controlling the data transmission through the RF modules. The proposed system has been evaluated based on logic utilization, in terms of the number of slice flip flops, the number of 4 input LUTs (Look-Up Tables) and the number of bonded lOBs (Input Output Blocks). The results for capacity usage are very promising as compared to other similar research. 展开更多
关键词 FPGA PICOBLAZE RF MULTI-NODE WIRELESS TRANSCEIVER
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C^1 C^2INTERPOLATION OF SCATTERED DATA POINTS 
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作者 WANG JIAYE AND ZHANG CAIMING(Department of Computer Science,Shandong University Jinan 250100) 《Applied Mathematics(A Journal of Chinese Universities)》 SCIE CSCD 1994年第1期1-9,共9页
In this paper an error in[4]is pointed out and a method for constructingsurface interpolating scattered data points is presented.The main feature of the methodin this paper is that the surface so constructed is polyno... In this paper an error in[4]is pointed out and a method for constructingsurface interpolating scattered data points is presented.The main feature of the methodin this paper is that the surface so constructed is polynomial,which makes the construction simple and the calculation easy. 展开更多
关键词 INTERPOLATION Scattered Data Points TRIANGLE POLYNOMIAL BarycentricCoordinate.
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A novel stochastic collocation method for uncertainty propagation in complex mechanical systems 被引量:1
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作者 QI WuChao TIAN SuMei QIU ZhiPing 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2015年第2期47-54,共8页
This paper presents a novel stochastic collocation method based on the equivalent weak form of multivariate function integral to quantify and manage uncertainties in complex mechanical systems. The proposed method, wh... This paper presents a novel stochastic collocation method based on the equivalent weak form of multivariate function integral to quantify and manage uncertainties in complex mechanical systems. The proposed method, which combines the advantages of the response surface method and the traditional stochastic collocation method, only sets integral points at the guide lines of the response surface. The statistics, in an engineering problem with many uncertain parameters, are then transformed into a linear combination of simple functions' statistics. Furthermore, the issue of determining a simple method to solve the weight-factor sets is discussed in detail. The weight-factor sets of two commonly used probabilistic distribution types are given in table form. Studies on the computational accuracy and efforts show that a good balance in computer capacity is achieved at present. It should be noted that it's a non-gradient and non-intrusive algorithm with strong portability. For the sake of validating the procedure, three numerical examples concerning a mathematical function with analytical expression, structural design of a straight wing, and flutter analysis of a composite wing are used to show the effectiveness of the guided stochastic collocation method. 展开更多
关键词 uncertainty propagation stochastic collocation method equivalent weak form guided surface STATISTICS
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