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单股钢丝绳在牵引力作用下的回扭行为研究
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作者 傅威 谢琪 燕晨耀 《自动化应用》 2023年第14期208-210,共3页
钢丝绳强度高、抗冲击能力强且使用方便,常被用于结构强度试验中的飞机试验件起吊和结构加载,但当其受到的牵引力超过自身扭转刚度时,会导致钢丝绳发生回扭现象,对试验件安全造成一定风险。单股钢丝绳作为组成多股钢丝绳的结构单元,对... 钢丝绳强度高、抗冲击能力强且使用方便,常被用于结构强度试验中的飞机试验件起吊和结构加载,但当其受到的牵引力超过自身扭转刚度时,会导致钢丝绳发生回扭现象,对试验件安全造成一定风险。单股钢丝绳作为组成多股钢丝绳的结构单元,对其力学性能的研究尤为重要。本文采用梁-壳股线建立了单股钢丝绳结构模型,利用ABAQUS有限元软件分析在牵引力作用下单股钢丝绳结构的回扭行为,并探究了其他力学参数对其回扭行为的影响。 展开更多
关键词 单股钢丝绳 回扭行为 单股钢丝绳梁-壳模型 力学参数
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先进高强度双相钢弯扭复合回弹补偿控制研究
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作者 李洪周 冯阳阳 +1 位作者 张文广 李屹萌 《塑性工程学报》 CAS CSCD 北大核心 2024年第2期76-85,共10页
针对先进高强度双相钢弯扭复合回弹的预测与补偿问题,在弯扭复合回弹试验的基础上建立了有限元模型并进行了仿真模拟。首先,利用DP600材料在弯扭复合回弹试验中回弹量较大的特点,进行了单向拉伸试验和加载-卸载-反向加载的拉压试验以测... 针对先进高强度双相钢弯扭复合回弹的预测与补偿问题,在弯扭复合回弹试验的基础上建立了有限元模型并进行了仿真模拟。首先,利用DP600材料在弯扭复合回弹试验中回弹量较大的特点,进行了单向拉伸试验和加载-卸载-反向加载的拉压试验以测定DP600的力学特性。其次,分别采用Ls-dyna提供的4种弹塑性材料模型建立了单向拉伸和拉压试验有限元模型,通过Ls-opt迭代求解筛选出合适的材料模型及参数,结果表明,采用MAT125材料模型预测的数值更接近弯扭复合回弹试验数据。最后,通过反向截面补偿法推导出底部支撑距离移动公式,通过反向位移补偿法和偏置曲面得到模具面,对弯扭复合回弹结果分别进行补偿。发现利用反向位移补偿法,并通过偏置曲面的方式,能够对在上压杆偏转角度增加时诱发的弯扭复合回弹进行有效补偿控制。 展开更多
关键词 先进高强度双相钢 复合 本构模型 参数反求 弹补偿
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先进高强度双相钢弯扭复合回弹评价与试验研究 被引量:1
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作者 冯阳阳 李洪周 +1 位作者 张文广 彭联胜 《精密成形工程》 北大核心 2023年第5期79-87,共9页
目的针对先进高强度双相钢冲压成形后回弹量大且多种回弹形式相互作用的问题,提出弯曲–扭曲复合回弹试验评价指标与测试方法,研究双相钢强度级别和试验条件对弯扭回弹的影响规律。方法建立板料回弹前后的几何关系,提出弯扭复合回弹评... 目的针对先进高强度双相钢冲压成形后回弹量大且多种回弹形式相互作用的问题,提出弯曲–扭曲复合回弹试验评价指标与测试方法,研究双相钢强度级别和试验条件对弯扭回弹的影响规律。方法建立板料回弹前后的几何关系,提出弯扭复合回弹评价指标,通过改变三点弯曲试验上压杆的偏转角度,开展弯扭复合回弹试验。结果基于合理的几何关系假设提出的评价指标适用于弯扭复合回弹试验结果分析。当上压杆偏转角度为0°时,强度越高,板料弯曲回弹越明显,回弹后横截面顶点距离和2条对角线长度变化越小;随着上压杆偏转角度的增加,当上压杆偏转0°~15°时,不同强度的3种试件(DP600、DP780、DP980)的横截面顶点距离和2条对角线长度增大,其中DP600试件的横截面顶点距离变化最小;当上压杆偏转15°~45°时,3种试件共同表现出横截面顶点距离减小、一条对角线长度减小、另一条对角线长度增加,其中DP980试件的对角线长度之差最小。结论试验数据与分析结果表明,调整三点弯曲试验中上压杆的偏转角度可以诱发不同的扭曲回弹量,进而有效控制弯曲回弹与扭曲回弹的复合程度。分别利用板料横截面顶点距离变化及2条对角线长度变化评价弯曲回弹和扭曲回弹程度,利用二者综合评价弯扭复合回弹程度。板料的扭曲回弹受板料强度制约进而影响弯曲回弹程度。 展开更多
关键词 双相钢 复合 评价指标 三点弯曲试验
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庆贺沙少海教授执教55周年图片专辑
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《广西大学学报(哲学社会科学版)》 CSSCI 1990年第1期2-2,共1页
1989年9月3日,广西大学中文系、中国民主同盟广西委员会和广西古代汉语教学研究会在广西大学举行沙少海教授执教55周年庆贺会。
关键词 少海 专辑 图片 教授 回扭 广西大学 田田 古代汉语教学 图网 斑图
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内蒙古自治区纪念马克思逝世一百周年大会
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作者 余小珩 《内蒙古社会科学》 1983年第2期2-2,共1页
在马克思逝世一百周年之际,自治区党委宣传部、自治区党校、自治区社会科学院、自治区哲学社会科学学会联合会联合举办了纪念马克思逝世一百周年学术报告会。
关键词 田田 一百周年 内蒙古自治区 马克思 回扭 围田 学术报告会 宣传部
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巧取农机断螺栓
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作者 王华 《农村百事通》 2004年第10期23-23,共1页
关键词 断螺栓 巧取 农机 中心铳 堆焊 回扭 手锤 钻透 螺母 孔内
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图片报导
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《新疆金融》 1995年第10期57-57,共1页
关键词 图片 人民银行 优秀论文 区分行 讨论会 学习班 口肋 回扭 井对 典礼
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Ex situ echo sounder target strengths of ice krill Euphausia crystallorophias 被引量:1
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作者 Hyoung Sul LA Hyungbeen LEE +2 位作者 Donhyug KANG SangHoon LEE Hyoung Chul SHIN 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2015年第3期802-808,共7页
Ice krill is the keystone species in the neritic ecosystem in the Southern Ocean, where it replaces the more oceanic Antarctic krill. It is essential to understand the variation of target strength (TS in dB re l m^2... Ice krill is the keystone species in the neritic ecosystem in the Southern Ocean, where it replaces the more oceanic Antarctic krill. It is essential to understand the variation of target strength (TS in dB re l m^2) with the different body size to accurately estimate ice krill stocks. However, there is comparatively little knowledge of the acoustic backscatter of ice krill. The TS of individual, formalin-preserved, tethered ice krill was measured in a freshwater test tank at 38, 120, and 200 kHz with a calibrated split-beam echo sounder system. Mean TS was obtained from 21 individual ice krill with a broad range of body lengths (L: 13-36 iron). The length (L, mm) to wet weight (W; mg) relationship for ice krill was 11/=0.001 21g^103~L35s (R2=0.96). The mean TS-to-length relationship were TS38kHz=-177.4+57log10(L), (R^2=0.86); TS120kHz= -129.9+31.561ogf0(L), (R2=0.87); and TS200kHz=-117.6+24.661ogre(L), (R2=0.84). Empirical estimates of the relationship between the TS and body length of ice krill were established at 38, 120, and 200 kHz and compared with predictions obtained from both the linear regression model of Greene et al. (1991) and the Stochastic Distorted Wave Born Approximation (SDWBA) model. This result might be applied to improve acoustic detection and density estimation of ice krill in the Southern Ocean. Further comparative studies are needed with in situ target strength including various body lengths of ice krill. 展开更多
关键词 ice krill Euphausia crystallorophias ex situ target strength split-beam echo sounder
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敖幼祥四格漫画系列 乌龙院之奥林霹客
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《小学时代》 2008年第8期49-49,共1页
关键词 漫画 系列
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Output Speed and Torque of Differential Double-Stator Swing Hydraulic Multimotors
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作者 闻德生 蔡秋雄 +1 位作者 马洪胜 高俊峰 《Journal of Donghua University(English Edition)》 EI CAS 2013年第6期487-493,共7页
A new type of differential double-stator swing hydraulic motor, based on double stator structure, was introduced. Compared with the traditional swing hydraulic motors, it could provide various kinds of rotational spee... A new type of differential double-stator swing hydraulic motor, based on double stator structure, was introduced. Compared with the traditional swing hydraulic motors, it could provide various kinds of rotational speeds and torques under the same conditions of input flow rate and pressure. The operating prindple and graphic symbols were described. The output speed and torque characters in multifarious connection modes were analyzed through single-acting differential double-stator swing hydraulic multi-motors. Then the differential connection modes and differential principles of differential double-stator swing hydraulic multi-motors were stated. Furthermore, the output speed and torque characters of double- acting and triple-acting ones in multifarious connection modes were gotten. The interaction between output torque and the displacement ratio was studied. Finally, the internal leakage that influenced the volumetric efficiency was researched. The theoretical and experimental researches show that the differential double-stutor swing hydraulic multi-motors can provide various kinds of rotational speeds and torques. Predictably, this new kind of swing hydraulic multi-motors has broad application prospects in machine tool equipments, engineering machineries, and simulation turntables. 展开更多
关键词 swing hydraulic motors DOUBLE-STATOR differential connection TORQUE rotational speed
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Effect of Web Opening on Buckling Instability of Simply Supported Steel I-Beam
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作者 Mohammed Hassanien Serror 《Journal of Civil Engineering and Architecture》 2011年第9期809-818,共10页
The lateral torsional buckling phenomenon often governs design of steel I-beams. Although web opening is often used to accommodate the required mechanical and piping works in buildings, its effect on the buckling inst... The lateral torsional buckling phenomenon often governs design of steel I-beams. Although web opening is often used to accommodate the required mechanical and piping works in buildings, its effect on the buckling instability is not considered in the design codes. In this paper, the effect of web opening on both lateral torsional buckling and local buckling behaviors has been investigated. A simply supported steel I-beam has been studied under uniform bending moment around the major axis. Buckling analysis has been performed using the finite element method. Linear regression analysis has been conducted for output data to formulate an equation for the critical moment including web opening effect. The results have shown a limited reduction in the lateral torsional buckling capacity and a significant reduction in the local buckling capacity. 展开更多
关键词 Lateral torsional buckling local buckling simply supported I-Beam uniform bending web opening
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装璜系设计作品
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《美苑》 CSSCI 1998年第4期17-19,共3页
关键词 标志设计 装璜 广告设计 研究生 设计作品 体育节 奥罗 China 回扭
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夜间奇痒的疥疮
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作者 杨广禄 《健康》 1997年第8期35-35,共1页
一位男青年为了避开太多的候诊者,以避免难堪和把病传染给别人,一大早就来到了某医院专家门诊。随着医生的到来,他跟进诊室,用乞求的目光打量着医生的表情,然后怯怯地说:“大夫,我有一个多星期了,身上特别痒,有的小疙瘩被我抓破了,直流... 一位男青年为了避开太多的候诊者,以避免难堪和把病传染给别人,一大早就来到了某医院专家门诊。随着医生的到来,他跟进诊室,用乞求的目光打量着医生的表情,然后怯怯地说:“大夫,我有一个多星期了,身上特别痒,有的小疙瘩被我抓破了,直流水儿……”说着,他用双手抓住裤腰,身子来回扭动,还不停地隔着衣服在大腿根部搔抓。 展开更多
关键词 疥疮 男青年 医生 大腿根 衣服 抓破 回扭 小疙瘩 直流水 诊室
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light intensity at the return place and encirclement power ratio for the distorted reflected beam based on cat-eye effect 被引量:4
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作者 赵延仲 孙华燕 +1 位作者 张来线 郑勇辉 《Optoelectronics Letters》 EI 2011年第6期478-482,共5页
Based on the definition of second order moment and the approximate three-dimensional analytical formula for probe detected laser beam passing through a cat-eye optical lens with center shelter and oblique detector, th... Based on the definition of second order moment and the approximate three-dimensional analytical formula for probe detected laser beam passing through a cat-eye optical lens with center shelter and oblique detector, the analytical expression of the encirclement power ratio of the cat-eye effect reflected light under far-field condition has been deduced. Variable laws of light intensity at the return place and encirclement power ratio are performed by numerical calculation, and are analyzed physically. The results show that the light intensity at the return place decreases monotonically with the increases of the diameter, incidence angle, tilted angle of the detector and the center shelter ratio, but the relationships between these parameters and the encirclement power ratio are all nonmonotonic. The reasonable choice of the focal shift size would result in the largest light intensity at the return place and the largest erirclenent power ratio. 展开更多
关键词 Magnetic materials Optoelectronic devices
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Go!光之团![连载—6]
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作者 极乐鸟 《家教世界》 2010年第12期22-25,共4页
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