共查询到20条相似文献，搜索用时 140 毫秒
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本文就多层框架结构设计思路予以讨论,包括建筑设计和结构设计两大方面。首先确定框架结构布局,进行重力荷载代表值计算,利用顶点位移法求出自振周期,按底部剪力法计算水平地震作用下侧移大小,利用D值法求出在水平荷载作用下结构内力。用弯矩分配法计算竖向荷载作用下的结构内力并进行内力组合,找出最不利组合,进行梁、柱、板的截面设计,楼梯设计,平台板、梯段板、平台梁等构件设计。 相似文献
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从现行钢筋混凝土板武楼梯设计方法分析,楼梯设计时仅计入了恒载和可变荷载,未考虑地震作用的影响,应在设计计算时,将楼梯参与整体计算以考虑地震作用.有学者给出了新型楼梯参与结构整体计算的方法,把楼梯当做斜梁来考虑其刚度.并分析了楼板、梯柱和梯梁在抗震结构中的作用,同时比较了楼梯布置在不同位置对结构的不同影响. 相似文献
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超静定结构内力求解的方法有力法、位移法、渐进法等方法。本文从发展历史、策略思想、计算程序、采用复杂体系，应用范围五个方面对这三种方法进行比较和总结，以便熟悉和掌握结构内力的计算方法，从而进一步研究超静定结构的内力计算方法。 相似文献
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根据量子位的Bloch球面坐标提出的一种量子进化算法,首先使用量子位的Bloch球面坐标对量子染色体进行编码,通过量子旋转门对量子位进行更新,而对于量子旋转门转角大小的选择,提出了一种简单快捷的确定方法。在旋转、变异操作的过程中,采用了基于量子位Bloch球面坐标的新算子。数值计算结果证明,基于量子位Bloch球面坐标的量子遗传算法在搜索能力和优化效率两方面优于普通的量子遗传算法。 相似文献
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本文以主梁为结构内力计算为例,应用结构力学求解器(SM Solver)对工程结构进行内力计算分析,将其结果与系数表人工求解方法所得结果的主要数据进行对比分析,表明采用SM Solver计算的结果满足工程计算精度要求。将SM Solver计算结果导入数学分析软件MATLAB绘制出弯矩内力包络图,很好地解决了系数表人工求解方法中无法得到主梁跨中各控制截面最不利内力的问题。将SM Solver和MATLAB结合起来,提供了一种简便易行的结构内力计算和内力包络图绘制方法。 相似文献
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曲线计算无论是在公路工程、铁路工程还是其他工程中都非常常见,并且曲线计算一直是坐标计算中的一个重点和难点,目前我们常使用的手工坐标的计算方法是切线支距法。在坐标放样方法中有一种方法叫偏角法,利用放样点坐标和已知点坐标我们可以求出偏向角和距离,然后利用偏向角和距离通过全站仪放样出给定的放样点。结合偏角法放样的特点和坐标计算的一些特性我们就可以推导出一直新的坐标计算公式,这样能够更快、更准的计算出施工放样坐标来,同时这也是一种检查坐标计算的方法,为保证我们计算数据的准确性提供有力的保证。 相似文献
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A spiral inertial filtration (SIFT) device that is capable of high-throughput (1 ml/min), high-purity particle separation while concentrating recovered target particles by more than an order of magnitude is reported. This device is able to remove large fractions of sample fluid from a microchannel without disruption of concentrated particle streams by taking advantage of particle focusing in inertial spiral microfluidics, which is achieved by balancing inertial lift forces and Dean drag forces. To enable the calculation of channel geometries in the SIFT microsystem for specific concentration factors, an equivalent circuit model was developed and experimentally validated. Large particle concentration factors were then achieved by maintaining either the average fluid velocity or the Dean number throughout the entire length of the channel during the incremental removal of sample fluid. The SIFT device was able to separate MCF7 cells spiked into whole blood from the non-target white blood cells (WBC) with a recovery of nearly 100% while removing 93% of the sample volume, which resulted in a concentration enhancement of the MCF7 cancer cells by a factor of 14. 相似文献
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企业是自主创新的主体,只有创新驱动力充足的企业才可能进行自主创新。在企业自主创新的驱动力中,包含着核心驱动力、内部驱动力、外部驱动力。各种驱动力起着不同的交互作用,企业家的创新精神与创新的企业文化是核心驱动力,企业内部的驱动力是根本驱动力,企业外部的驱动力是基础驱动力。在此基础上,本文对企业自主创新驱动力的结构进行研究,提出了企业自主创新驱动力的"三环结构",以获取最为有效的企业自主创新驱动力结构,从而推动企业自主创新成功。 相似文献
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通过构建概念模型,探讨企业内部社会资本、知识螺旋与产品创新之间的关系。基于Bootstrap的实证研究表明,认知维度显著影响产品创新,而结构维度和关系维度对产品创新没有直接影响;结构维度和认知维度显著影响知识螺旋,而关系维度对知识螺旋没有显著影响;知识螺旋显著影响产品创新,并且在内部社会资本不同维度与产品创新关系中扮演重要的中介效应。企业产品创新不仅仅要重视各种硬件和软件建设,也要关注组织成员之间关系的和谐,更要重视隐性知识与显性知识交互对产品创新的重要影响。 相似文献
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本文针对对称的静定结构,提出了一种新方法——对称法。取用了该种结构“半结构图“,并进行了证明,巧妙利用对称法对结构进行内力计算,是一种教学内容与方法的创新,填补了现行教材静定结构“对称法”的证明与对称性利用的空白,大大降低了解题难度,加快了计算速度,提高了计算效率,提升了学生兴趣。 相似文献
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本文首先用投影法、截面法、柱面坐标法、球面坐标法[1]四种方法求解同一道三重积分计算实例,然后分析了各种方法最适合使用的条件和应注意的事项。 相似文献
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本文讨论应用空间坐标变换计算构件相贯线的方法。该方法的特点是构件在本地坐标系内进行坐标取样和交点处切面计算,再通过空间坐标变换到统一坐标系后应用矢量法计算交点(相贯线上的点),避免了使用复杂的交线方程式,同时避免了使用复杂方程描述时在接近临界点难于均匀取样,并且容易发生取样密度不适时出现断点或突变点的问题,应用本文算法绘制出的相贯线均匀连续平滑。此算法可推广应用于计算其他构件表面的相交线。 相似文献
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The problem of independent force and position control of multitask cooperating manipulators is studied. Each manipulator is in a non-singular configuration and the object can be driven by the contact forces exerted by the end effectors of the manipulators. The design requirement is to control each coordinate of the position of the object as well as each component of the “rest” forces, except the moving forces that are determined uniquely from the object's position. The present design requirement has been proved to be always satisfied together with asymptotic and BIBO stability. A class of controllers solving the above simultaneous problem is analytically determined. The proposed state feedback controller does not depend upon the specific object dynamics and thus the resulting closed-loop multimanipulator system performs as required, not only when handling various objects but also when the dynamics of the objects are unknown or hard to compute or disturbed by external forces. 相似文献
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The need for cell and particle sorting in human health care and biotechnology applications is undeniable. Inertial microfluidics has proven to be an effective cell and particle sorting technology in many of these applications. Still, only a limited understanding of the underlying physics of particle migration is currently available due to the complex inertial and impact forces arising from particle–particle and particle–wall interactions. Thus, even though it would likely enable significant advances in the field, very few studies have tried to simulate particle-laden flows in inertial microfluidic devices. To address this, this study proposes new codes (solved in OpenFOAM software) that capture all the salient inertial forces, including the four-way coupling between the conveying fluid and the suspended particles traveling a spiral microchannel. Additionally, these simulations are relatively (computationally) inexpensive since the arbitrary Lagrangian–Eulerian formulation allows the fluid elements to be much larger than the particles. In this study, simulations were conducted for two different spiral microchannel cross sections (e.g., rectangular and trapezoidal) for comparison against previously published experimental results. The results indicate good agreement with experiments in terms of (monodisperse) particle focusing positions, and the codes can readily be extended to simulate two different particle types. This new numerical approach is significant because it opens the door to rapid geometric and flow rate optimization in order to improve the efficiency and purity of cell and particle sorting in biotechnology applications. 相似文献