期刊文献+
共找到6篇文章
< 1 >
每页显示 20 50 100
热轧H型钢轧制孔型及导卫结构优化研究
1
作者 马志强 史亚国 +1 位作者 张奇 胡洪 《山西冶金》 CAS 2023年第12期140-142,共3页
主要通过对H型钢开坯机孔型和万能轧机孔型进行了优化,实现了产品料型更加美观、降低工艺故障率的目的。结果表明:开坯机孔型侧壁倾角的改进、万能轧机轧辊三段式孔型设计及万能导卫结构的优化改进,对型钢产品质量控制至关重要。
关键词 H型钢 开坯机孔型 万能轧机孔型 导卫结构 产品尺寸
下载PDF
重钢高线轧机导卫设计与应用
2
作者 卿俊峰 刘勇 《重庆工业高等专科学校学报》 2002年第B11期81-85,共5页
介绍了重钢高速线材轧机工艺流程、轧机主要设备特点、导卫结构设计、导卫的基本工艺参数设计以及运用效果。该生产线是国内设计、国内制造、自行安装的国内第一条保证80m/s的高速线材生产线。
关键词 高速线材轧机 导卫结构 工艺参数 设计 工艺流程 设备特点
下载PDF
B500BD13mm带肋钢筋四线切分轧制生产工艺开发 被引量:1
3
作者 张忠峰 王长生 +2 位作者 肖立军 曹文强 孟丽军 《山东冶金》 CAS 2024年第1期21-23,27,共4页
介绍了石横特钢棒材厂英标B500BD13mm热轧带肋钢筋四切分轧制生产工艺的设计。针对顶出口、切分刀粘铁、力学性能不稳定以及成品尺寸不符合标准问题,分别从提高轧机刚性、优化导卫结构、提高温度工艺控制精度和优化孔型、调整机架间张... 介绍了石横特钢棒材厂英标B500BD13mm热轧带肋钢筋四切分轧制生产工艺的设计。针对顶出口、切分刀粘铁、力学性能不稳定以及成品尺寸不符合标准问题,分别从提高轧机刚性、优化导卫结构、提高温度工艺控制精度和优化孔型、调整机架间张力的措施着手,实现了热轧带肋钢筋四切分的稳定轧制,最终形成工业化批量生产,年创效360万元,产品质量满足用户需求。 展开更多
关键词 B500B热轧带肋钢筋 四线切分 孔型 导卫结构 控轧控冷工艺
下载PDF
Methodology for Definition of the Three-Dimensional Geodesic Structures in the Olinda's Historical Site
4
作者 Andréa de Seixas Angela Maria Barbosa de Souza Luciene Ferreira Gama 《Journal of Civil Engineering and Architecture》 2014年第1期1-10,共10页
It is shown to be a relevant study involving terrestrial methods of measurement, such as: forward and backward intersections, geometric leveling, trigonometric leveling with short distance targeted and spatial positi... It is shown to be a relevant study involving terrestrial methods of measurement, such as: forward and backward intersections, geometric leveling, trigonometric leveling with short distance targeted and spatial positioning GNSS methods, for the definition of field reference points and field-object points located in rough terrain. The geodesic structures were implemented in the Historic Site of Olinda employing GNSS (global navigation satellite system) receivers, total stations and digital level. The historical site of Olinda was recorded by UNESCO as Historical and Cultural Heritage of Humanity. The study area is located in the center of the busiest site with a quite roughly relief. This area has been studied since 2007 involving Research of Scientific Initiation and Pos-Graduation Course. This paper aims to present the realized experiments for the implementation and definition of geodesic structures in environments with very rough relief, including large old houses and historic monuments. 展开更多
关键词 Three-dimensional geodesic structures geodesic surveying reference points object points terrestrial methods ofmeasurements GNSS methods.
下载PDF
Navigation signal structure based on complex carrier modulation 被引量:3
5
作者 XU Ying YUAN Hong 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2011年第6期1035-1045,共11页
Signal structure design is an important part of satellite navigation system research,which directly affects navigation performance.Signal performance parameters are analyzed and performances of BPSK modulated signals ... Signal structure design is an important part of satellite navigation system research,which directly affects navigation performance.Signal performance parameters are analyzed and performances of BPSK modulated signals and BOC modulated signals are compared.Aiming at requirements of high navigation precision and high anti-jamming ability,a new navigation signal structure based on complex carrier modulation is proposed and performances of the signal are researched with different parameters.A synchronization algorithm is put forward according to the signal characteristics,and the synchronization performance is qualitatively analyzed.Next,the applications of the complex carrier modulated signal are discussed,which include anti-jamming,navigation enhancement,power combing and so on.Simulations and analysis show that the proposed navigation signal structure based on complex carrier modulation has good navigation capabilities and anti-jamming abilities,which deserves further study. 展开更多
关键词 complex carrier modulation BPSK BOC root mean square bandwidth
原文传递
Optimizing the Gabor Bandwidth of satellite navigation signals by MCS signal expression 被引量:1
6
作者 ZHANG XiaoMing YAO Zheng LU MingQuan 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2011年第6期1077-1082,共6页
Satellite navigation is playing an important role in social life.The performances of the services a navigation system provides are the concern of the builders and users.The signal structure determines the inherent abi... Satellite navigation is playing an important role in social life.The performances of the services a navigation system provides are the concern of the builders and users.The signal structure determines the inherent ability of a satellite navigation system to provide these services.Therefore,it is necessary and reasonable to optimize the signal in the initial design.The waveforms of signals in satellite navigation chips are an important aspect of the signal's structure,which impact the characteristics of the autocorrelation function and power spectrum in the time domain and frequency domain.The range accuracy of a navigation system is usually described by its Gabor Bandwidth.The Gabor Bandwidth of the Binary Offset Carrier (BOC) modulation in next-generation GNSS signal systems is not optimal.This paper presents a signal expression based on Multilevel Coded Symbol (MCS) signals,which can describe the fine structure of navigation signals.With this expression,we can optimize the Gabor Bandwidth of the signal,and find out the corresponding MCS vector and chip waveform,so as to get higher range accuracy.The method in this paper,in theory,is of great value in the design of next-generation navigation signals. 展开更多
关键词 satellite navigation MCS signal Gabor Bandwidth BOUND
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部