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This paper presents the research on the laws of systematic-parameter dependent variation in the vibration amplitude of drum-brake limit cycle oscillations (LCO). We established a two-degree non-linear dynamic model to describe the low-frequency vibration of the drum brake, applied the centre manifold theory to simplify the system, and obtained the LCO amplitude by calculating the normal form of the simplified system at the Hopf bifurcation point. It is indicated that when the friction coefficient is smaller than the friction coefficient at the bifurcation point, the amplitude decreases; whereas with a friction coefficient larger than the friction coefficient of bifurcation point, LCO occurs. The results suggest that it is applicable to suppress the LCO amplitude by changing systematic parameters, and thus improve the safety and ride comfort when applying brake. These findings can be applied to guiding the design of drum brakes. 相似文献
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An efficient method for tracing planar implicit curves 总被引：1，自引：0，他引：1
YU Zheng-sheng CAI Yao-zhi OH Min-jae KIM Tae-wan PENG Qun-sheng 《浙江大学学报(A卷英文版)》2006,7(7):1115-1123
INTRODUCTION Tracing a planar implicit curve f(x, y)=0 on a rectangular region [xl, xr]×[yb, yt] is of great interest in Computer-Aided Design and Computer Graphics. While parametric curves are easy to plot, plotting implicit curves is a challenging problem. Planar im- plicit curve plotting method can be classified into two categories (Shou et al., 2005; Martin et al., 2002; Lopes et al., 2002). In the first category are subdivi- sion methods (Shou et al., 2005; Martin et al., 2002) … 相似文献
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The dynamic characteristics and failure modes of steel reinforced concrete (SRC) columns subjected to blast loading are complicated because of the transient stress wave in the SRC columns and the interaction between steel and concrete. This paper presents a numerical simulation of the response of SRC columns subjected to blast loading using hydrocode LS-DYNA. In the numerical model, a sophisticate concrete material model (the Concrete Damage Model) is employed with consideration of the strain rate effect and the damage accumulation. An erosion technique is adopted to model the spalling process of concrete. The possible failure modes of SRC columns are evaluated. It is observed that the failure of SRC columns subjected to blast load can generally be classified into three modes, namely, a direct failure in concrete body due to the stress wave, a transverse shear failure near the support sections due to the high shear force, and a flexural failure pertaining to large local and global deformation of the reinforcing steel. 相似文献
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INTRODUCTION Plants have defense mechanisms against patho-gen infection by inducing systemic resistance in re-sponse to localized pretreatment with biological cotrol agents, thus making them resistant to subsequpathogen infection (Caruso et al., 1999; Hammschmidt, 1999; Mohammadi and Kazemi, 2002; yada et al., 1995; Pozo et al., 2002; Ray et al., 199Biological control of plant pathogens has receivmuch more attention. It is well known that plants amicroorganisms symbiosis is a defense m… 相似文献
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ＤＥＴＥＲＭＩＮＡＴＩＯＮＯＦＣＹＣＬＯＴＲＩＭＥ－ＴＨＹＬＥＮＥＴＲＩＮＩＴＲＡＭＩＮＥＩＮＳＥＲＵＭＯＦＲＡＢＢＩＴＢＹＲＰ－ＨＰＬＣＣｈｅｎＹｏｎｇ；ＹｕａｎＺｈｕｏ－ｂｉｎ（ＧｒａｄｕａｔｅＳｃｈｏｏｌ，ＡｃａｄｅｍｉａＳｉｎｉｃａ．Ｂｅｉｊ... 相似文献
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音乐治疗作为康复领域的新兴疗法,正日益成为当前研究的热点。近年来,中国音乐治疗研究文献数量正不断上升,越来越多的研究者把关注点放在了临床运用领域,然而随着音乐治疗临床应用的不断展开,很多细节却暴露了中国音乐治疗发展中存在的不足。综述了中国音乐治疗研究论文概况,采用文献计量学方法,以频次和百分比为主要统计方式从各种指标入手定量分析中国音乐治疗研究文献,并就目前中国音乐治疗中存在的问题进行讨论。 相似文献
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THANG Truong Cong KIM Young Suk RO Yong Man KANG Jungwon KIM Jae-Gon 《浙江大学学报(A卷英文版)》2006,7(5):764-772
INTRODUCTION Scalable video coding (SVC) (Schwarz et al., 2004) is the most promising video format for appli- cations of collaborative communication. First, SVC format, which is extended from the latest advanced video coding (AVC), is appropriate for creating a wide variety of bitrates with high compression effi- ciency. Second, an original SVC bitstream can be easily truncated in different ways to meet various characteristics and variations of devices and connec- tions. The scalabil… 相似文献
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Xuerui Yi Yong Guo Siyuan Pan Yiqiao Wang Sijia Chi Shichao Wu Quan-Hong Yang 《天津大学学报(英文版)》2023,29(1):73-87
Solid-state batteries(SSBs) have been considered the most promising technology because of their superior energy density and safety.Among all the solid-state electrolytes(SEs),Li7La3Zr2O12(LLZO) with high ionic conductivity(3 × 10-4 S/cm) has been widely investigated.However,its large-scale production in ambient air faces a challenge.After air exposure,the generated Li2CO3 layer deteriorates the ionic conductivity and in... 相似文献
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韩国国家医学教师培训中心(NTTC)是一种全国性的医学教育资源,它对韩国医学教育的基本问题提供指导,并为从事实际工作的医师提供继续教育,它也帮助卫生科学的教师学习教学法、教育评价和课程计划方面的知识和技巧。 相似文献
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狂草书势的形成，历来鲜有论述，偶有触及，失之简约。本文运用美学原理，从笔墨技巧、立象见意、表情达性、人格魅力等层面揭示了张旭怀狂草书势的内涵。 相似文献