共查询到20条相似文献，搜索用时 93 毫秒
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中大口径舰炮弹道观测校正探讨 总被引：1，自引：0，他引：1
针对舰炮命中精度低的弱点，中提出了舰炮弹道观测校正方案。根据舰炮弹道观测，预推落点进行射击最佳校正量估计，实现射击观测、校正、指挥与控制全自动化，可大大提高舰炮射击精度与作战效能。 相似文献
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本文讨论了基于信息熵概念的误差理论特点 ,总结了精度理论研究现状和成果 ,通过分析实例初步建立了基于熵概念的测控系统精度评价指标体系 ,为误差溯源、误差校正、优化系统结构等提供依据 相似文献
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提出了一种能校正系差的检测控制系统,当被测物理量能被定义为"低速变化物理量"时,利用误差理论对被测信号数据进行数据处理,可以达到用低精度采集系统进行高精度采集的目的。 相似文献
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杨忆 《中国科教创新导刊》2011,(10):118-118
套类工件是机械零件中精度要求较高的工件之一。它主要加工表面是内孔、外圆、端面和内沟槽等。这些表面不仅有尺寸精度和表面粗糙度的要求,而且彼此间还有较高的形状精度和位置精度的要求。因此,在车削中应选择合理的车削工艺方法。本人通过多年教学实践,对教材做出相应的教学改进,使教材线索清晰,过渡自然,学生容易接受。 相似文献
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研究了国内外数控机床的几何精度、直线运动精度、圆运动精度、切削精度检测技术的现状,阐述了精度检测技术对数控机床发展的重要意义。 相似文献
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孙涵芳 《宁波大学学报(教育科学版)》1988,(1)
在微机测控系统和智能仪器仪表中,常用线性插值法实现传感器静态误差校正和函数逼近计算等。本文分析了用双字节定点整数运算进行插值计算所能达到的计算精度,并列举了两个计算实例。分析和计算结果证明:只要对原始数据进行合理的量化处理,双字节整数插值计算可以达到10~(-4)～10~(-5)数量级的精度。因此,这种算法可以广泛应用于微机化的系统和仪器中。采用较短字长的整数运算,具有实时性好,要求存贮器容量小和程序简单等三个突出的优点。 相似文献
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林辉 《株洲师范高等专科学校学报》2005,10(2):5-9,14
遥感图像在进行几何精校正时．需采用地面控制点(GCPs)，这些控制点一般来源于地形图．因此．校正后遥感图像的坐标和精度主要决定于地形图．本文以遥感图像作为校正空间．对研究区内Quick Bird、SPOT-5、ETM 和TM多源遥感图像采用分辨率由高至低分级校正．对分辨率最高的Quick Bird图像校正所需的地面控制点坐标采用静态GPS地面实测的方法．使校正后的图像具有较高精度．研究结果表明：用高精度的图像作为校正空间具有较好的校正效果．研究所涉及的4个时相、5种分辨率和4个遥感平台的多源遥感图像，分级校正后的精度均较高。 相似文献
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数控机床在职业院校实训场所和相应机械加工企业中的应用越来越广泛,对于数控机床加工的精度要求也越来越高,笔者对影响数控加工精度的因素进行了多方位分析,并在此基础上对提高数控机床加工精度常见的方法进行了详细的阐述。对于正确选择和应用数控机床有一定的指导作用。 相似文献
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随着全站仪、GPS的广泛使用,导线测量已成为普遍采用的控制测量方法。本文利用附合导线实例计算了近似、严密平差两种算法的点位精度,提出了两种方法的应用领域。 相似文献
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The objective of this paper is to review and synthesize two interrelated topics in the adult metacomprehension literature:
the bases of metacomprehension judgment and the constraints on metacomprehension accuracy. Our review shows that adult readers
base their metacomprehension judgments on different types of information, including experiences with current tasks and pre-formed
expectations of performance affected by factors such as self-perception of ability. We propose a model that shows the anchoring
and adjustment mechanism (Tversky and Kahneman, Science 185:1124–1130, 1974) underlies metacomprehension judgments. Specifically,
due to test uncertainty, people may judge future comprehension performance by starting with an anchor such as pre-formed performance
expectations and then (insufficiently) adjust away from it based on experiences with current tasks. This anchoring and adjustment
model of metacomprehension judgment sheds light on what constrains metacomprehension accuracy. We conclude that two main accuracy
constraints are the anchoring effect and the poor diagnostic validity of experiential cues. Based on the review, we discuss
avenues for future research that will further our understanding of the mechanisms underlying metacomprehension. 相似文献
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介绍了机器调整装配的三种基本方法.从理论分析入手,考虑不同的装配类型,以保证装配精度、降低生产成本,提高生产率为目的,阐述了可动调整装配法的原理及其特点;通过实例阐明了固定调整装配法的原理和方法、步骤及其应用技巧;在对误差抵消调整的典型实例进行分析后,得出该方法的原理和应用技能,有助于产品设计过程中合理确定零部件结构、尺寸,简化制造工艺、降低零件加工难度、保证装配质量. 相似文献
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The machining accuracy of workpiece is influenced by its orientation deviation, which is caused by the fixture-workpiece error. Based on the spatial coordinate theory, the orientation deviation of workpiece is measured by using an on-machine verification system, which can take into account the errors resulting from fixture manufacturing, installation and adjustment, location and clamping of workpiece. According to the least square method, the model of orientation deviation is built to determine the relationship between the theoretical and actual coordinate systems. The influence of orientation deviation on machining accuracy is quantified, and it is shown that the orientation deviation only affects the dimensional precision and position precision, rather than shape precision. In the experiment, the compensation processing of realtime errors was conducted, and the perpendicularity and inclination errors of the tetragonal part were reduced by 38.46% and 47.06%, respectively. 相似文献
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This paper mainly discusses the criteria of scientific translation,accuracy of content,accuracy of style and economy,which play a very vital role in guiding scientific translation.Several examples are utilized to support the application of these translation standards. 相似文献
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In this paper, by teaching a 3D robot unit model and playing back to simulate the assembly process in a virtual assembly environment, errors in robot assembly are analyzed. The paper also presents a visualization method for analyzing accuracy of the robot assembly, and studies the influence of the spatial pose of a robot on the success rate of an axis-hole assembly, and accuracy of the robot teaching program in particular. Through integration of various errors and on the basis of assembly accuracy, tolerance of error sources can be reasonably distributed to meet the assembly accuracy requirement, therefore the planning of robot assembly unit can be improved. 相似文献
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用三点的检定标准鉴定二维坐标测量仪器的综合精度,输入x_1与x_2,得出y_1与y_2,然后可从闭合差方程中得到纵座标和横座标的综合标准偏差。 相似文献
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How accurate are teachers’ first impressions and what moderates the degree of first impression accuracy? In previous teacher judgment accuracy research, teachers judged students who were well-acquainted to them, focusing on single traits. Here, we follow the zero-acquaintance paradigm and apply the Social Accuracy Model (SAM; Biesanz, 2010) to examine teachers’ first impressions regarding students’ personality profiles. Three groups of perceivers (student teachers, experienced teachers and psychology students; N = 285) rated students’ (N = 10) academic self-concept, intrinsic motivation and intelligence based on brief videos. SAM analyses revealed that teachers were accurate regarding the average students’ profile of characteristics (normative accuracy), but were not successful at detecting students' unique personality profiles (distinctive accuracy). Moreover, likeable students and those evaluated as more physically attractive were perceived with higher normative accuracy. Personality similarity and teaching experience were unrelated to accuracy. Implications for teacher judgment accuracy research and educational practice are discussed. 相似文献
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曾咪 《重庆职业技术学院学报》2007,16(5):56-58
高校学生英语口语水平的高低程度主要取决于其语言表达的流利性与正确性。教师在培养学生的语言表达能力时,应充分考虑各种影响学生口语流利性与正确性的因素,并针对性地采用相应的策略消除障碍,以提高其口语表达水平。 相似文献