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飞机静不定结构非线性应力计算——参考模量法 被引量:3
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作者 刘茂魁 赵春伟 《沈阳航空工业学院学报》 1995年第2期17-21,共5页
应用虚拟载荷法解飞机静不定结构非线性应力.当非线性充分发展时,因虚载荷过大而导致发散。本文提出参考模量法,使虚载荷减小,从而使收敛性大大提高。
关键词 非线性应力 虚载荷 参考模量 飞机 载荷
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参考切线模量与参考压缩模量间关系研究
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作者 张利钦 《江西建材》 2023年第5期189-190,193,共3页
参考切线模量通常要通过室内试验测定,而参考切线模量与参考压缩模量都是由固结压缩试验得出,且存在一定比例关系,参考切线模量同时与刚度参数、参考割线模量、参考加卸载模量也存在一定比例关系。文中探析了参考切线模量与参考压缩模... 参考切线模量通常要通过室内试验测定,而参考切线模量与参考压缩模量都是由固结压缩试验得出,且存在一定比例关系,参考切线模量同时与刚度参数、参考割线模量、参考加卸载模量也存在一定比例关系。文中探析了参考切线模量与参考压缩模量之间的关系,这对HSS模型刚度参数的确定具有重要意义。 展开更多
关键词 HSS模型 参考切线模量 参考压缩模量
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昆明地区典型土层HSS模型参数与基本物理指标相关性分析
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作者 杨伟锟 欧明喜 +1 位作者 高贵芬 黄建忠 《工业安全与环保》 2023年第12期18-23,共6页
以昆明地区基坑工程中3类典型土体(泥炭土、黏土和粉土)的土工数据为基础,针对基本物理指标开展正态性检验,分析了3类土体的一种HSS模型参数(参考切线模量E_(oed)_(ref))与基本物理指标的相关性,并建立相关回归模型。结果表明:①昆明地... 以昆明地区基坑工程中3类典型土体(泥炭土、黏土和粉土)的土工数据为基础,针对基本物理指标开展正态性检验,分析了3类土体的一种HSS模型参数(参考切线模量E_(oed)_(ref))与基本物理指标的相关性,并建立相关回归模型。结果表明:①昆明地区泥炭土、黏土和粉土的压缩模量(E_(s0.1~0.2))均服从对数正态分布,参考切线模量近似服从对数正态分布;②泥炭土、黏土、粉土的参考切线模量与压缩模量的线性关系依次为0.85E_(s-泥炭土)、0.89E_(s-黏土)和0.86E_(s-粉土);③在不考虑压缩模量时,建立的泥炭土、黏土和粉土参考切线模量与密度、含水率、初始孔隙比的多元回归模型为:泥炭土E_(oed)^(ref)=w^(0.699)-^(1.902)e_(0)^(2.061),黏土E_(oed)^(ref)=w^(0.699)-^(1.935)e_(0)^(2.259),粉土E_(oed)^(ref)=w^(0.423)e_(0)^(2.034)。上述经验公式可为计算昆明地区泥炭土、黏土和粉土的取值提供参考。 展开更多
关键词 小应变硬化模型 正态性检验 相关性分析 压缩模量 参考切线模量
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我国优秀女子摔跤运动员的体型特点及选材的初探 被引量:8
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作者 许永鹏 闫文霞 张永民 《军事体育学报》 1995年第Z1期44-50,共7页
本研究显示:女子摔跤运动员的形态具有身材矮而体重大,躯干、上肢相对较长而下肢相对较短,手大,肩较宽而骨盆相对较窄,躯干和四肢的围度都较大,体脂含量少而肌肉发达等特征。本研究还与男子摔跤运动员在体型等方面的异同进行了比较,对... 本研究显示:女子摔跤运动员的形态具有身材矮而体重大,躯干、上肢相对较长而下肢相对较短,手大,肩较宽而骨盆相对较窄,躯干和四肢的围度都较大,体脂含量少而肌肉发达等特征。本研究还与男子摔跤运动员在体型等方面的异同进行了比较,对一些不适合女运动员的形态指标及指数进行了适当修正并建议其作为今后女子摔跤运动员训练和选材的形态学指标参考模量。 展开更多
关键词 女子摔跤 体型 参考模量
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No-reference blur assessment method based on gradient and saliency 被引量:2
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作者 Jia Huizhen Lei Chucong +5 位作者 Wang Tonghan Li Tan Wu Jiasong Li Guang He Jianfeng Shu Huazhong 《Journal of Southeast University(English Edition)》 EI CAS 2021年第2期184-191,共8页
To evaluate the quality of blurred images effectively,this study proposes a no-reference blur assessment method based on gradient distortion measurement and salient region maps.First,a Gaussian low-pass filter is used... To evaluate the quality of blurred images effectively,this study proposes a no-reference blur assessment method based on gradient distortion measurement and salient region maps.First,a Gaussian low-pass filter is used to construct a reference image by blurring a given image.Gradient similarity is included to obtain the gradient distortion measurement map,which can finely reflect the smallest possible changes in textures and details.Second,a saliency model is utilized to calculate image saliency.Specifically,an adaptive method is used to calculate the specific salient threshold of the blurred image,and the blurred image is binarized to yield the salient region map.Block-wise visual saliency serves as the weight to obtain the final image quality.Experimental results based on the image and video engineering database,categorial image quality database,and camera image database demonstrate that the proposed method correlates well with human judgment.Its computational complexity is also relatively low. 展开更多
关键词 no-reference image quality assessment reblurring effect gradient similarity SALIENCY
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Establishment and Analysis of the Spectral Relationship Between Range-Rate and Gravity Potential Based on Energy Conservation 被引量:1
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作者 宁津生 钟波 +1 位作者 罗志才 罗佳 《Geo-Spatial Information Science》 2009年第2期79-84,共6页
The spectral relationship between range-rate measurements and the gravity potential for low-low satellite-to-satellite tracking mission was established based on the energy conservation theory. Then the performances of... The spectral relationship between range-rate measurements and the gravity potential for low-low satellite-to-satellite tracking mission was established based on the energy conservation theory. Then the performances of satellite separation, the orbital altitude, and the accuracy of range-rate measurements in recovering the earth's gravity field were simulated and analyzed by this method. Finally, the cumulative geoid errors of the reference mode were obtained by using the configuration parameters of the GRACE mission. By comparing the cumulative geoid errors of the reference mode and GGMO2S and EIGEN-GRACEO2S models, it basically reflected the performance of GRACE and proved the feasibility of this method. 展开更多
关键词 Earth's gravity field energy conservation SPECTRUM GRACE
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Simulation of dual transponder carrier ranging measurements 被引量:1
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作者 Xiang-yu ZHA Xiao-jun JIN Zhong-he JIN 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2009年第10期1395-1403,共9页
The most dominant error source for microwave ranging is the frequency instability of the oscillator that generates the carrier phase signal. The oscillator noise is very difficult to filter due to its extremely low fr... The most dominant error source for microwave ranging is the frequency instability of the oscillator that generates the carrier phase signal. The oscillator noise is very difficult to filter due to its extremely low frequency. A dual transponder carrier ranging method can effectively minimize the oscillator noise by combing the reference phase and the to-and-fro measurement phase from the same single oscillator. This method does not require an accurate time tagging system, since it extracts phases on the same satellite. This paper analyzes the dual transponder carrier ranging system by simulation of the phase measurements with comprehensive error models. Both frequency domain and time domain noise transfer characteristics were simulated to compare them with dual one-way ranging. The simulation results in the two domains conformed to each other and demonstrated that a high level of accuracy can also be achieved by use of the dual transponder carder ranging system, with relatively simple instruments. 展开更多
关键词 Dual transponder carrier ranging Dual one-way ranging Oscillator noise Transfer characteristic
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