汽车列车轨迹跟踪性能仿真与模型试验研究

提出一种简单的控制方式,与传统的汽车列车轨迹跟踪方式相比较,这种控制方式并非通过单纯操纵牵引车转角控制汽车列车的轨迹跟踪,而是采用控制汽车列车的折角达到汽车列车系统的稳定,进而使得汽车列车具有良好的轨迹跟踪性.通过模型试验平台的实验,证明了该控制方式的稳定性.     

Electricity generation and brewery wastewater treatment from sequential anode-cathode microbial fuel cell

A sequential anode-cathode double-chamber microbial fuel cell (MFC), in which the effluent of anode chamber was used as a continuous feed for an aerated cathode chamber, was constructed in this experiment to investigate the performance of brewery wastewater treatment in conjugation with electricity generation. Carbon fiber was used as anode and plain carbon felt with biofilm as cathode. When hydraulic retention time (HRT) was 14.7 h, a relatively high chemical oxygen demand (COD) removal efficiency of 91.7%–95.7% was achieved under long-term stable operation. The MFC displayed an open circuit voltage of 0.434 V and a maximum power density of 830 mW/m3 at an external resistance of 300 ?. To estimate the electrochemical performance of the MFC, electrochemical measurements were carried out and showed that polarization resistance of anode was the major limiting factor in the MFC. Since a high COD removal efficiency was achieved, we conclude that the sequential anode-cathode MFC constructed with bio-cathode in this experiment could provide a new approach for brewery wastewater treatment.     

中国某传统民居选址对自然通风的影响(英文)

利用计算流体动力学模拟了传统民居当大门建筑群丘陵地形下选址与自然通风的关系.该模拟包括不同气候与地形下的4个案例及其建筑周边风压与风速分布.模拟结果显示:山体能够降低建筑迎风面和背风面的风压绝对值;在有山体的地形中天井对自然通风的促进效果大于没有山体的地形,对比冬季与夏季天井效果时也可得到同样结论;作为障碍物,山体还能降低建筑周边的风速,且由于冬夏季风向不同,山体的影响程度呈现出较大区别.分析结果表明,丘陵位于建筑北向的选址方式可以解决亚热带气候条件下住宅冬夏2季不同的自然通风需求而造成的矛盾,尤其在含天井的住宅中最为显著.     

纤维滤料新模型的阻力数值模拟研究

利用流体力学开源代码OpenFOAM验证了单圆柱体周围的流体特性（包括流型和阻力）,表明Open-FOAM能够用于模拟低Re数流,并发现Shaw的解析解是斯托克斯悖论的一种解.通过对纤维滤料进行试验以及对Tronville-Rivers二维纤维随机分布滤料新模型的阻力特性进行数值模拟,发现Kuwabara模型比Hap-pel模型更能精确预测纤维滤料的阻力,而且试验阻力值介于纤维表面为无滑移和全滑移边界条件下的数值模拟值之间.     

Multisim在电子线路故障分析中的应用

随着电子技术的发展,EDA已经成为电子系统设计必不可少的工具。Multisim界面直观、操作方便,既可以进行电路设计,也可以进行各种功能的模拟仿真和电路分析。本文通过实例阐述Multisim在实际故障分析排除过程中的应用,以提高学生分析、解决实际问题的能力,培养其创新能力。     

Lagrangian time scales and its relationship to Eulerian equivalents in turbulent channel flow

Lagrangian and Eulerian time scales were obtained from the direct numerical simulation of turbulent channel flow at two Reynolds numbers based on the friction velocity and channel half-height, Rer= 80, 100. The Lagrangian integral time scales and time microscales were compared to their Eulerian equivalents. It is found that the ratio of Lagrangian to TL Eulerian integral time scales is given by TE/TiE= 1 ＋ 0.1y＋ for y＋ ≤ 10, and that the ratios between the Lagrangian to theEulerian time microscales are almost the same irrespective of the components. Those increase with y＋ are approximated by ≈ 2.75 - 1.75 exp （-v＋/a） . These results also show that these expressions are independent of the Reynolds number.     

Performance investigation of 2D lattice Boltzmann simulation of forces on a circular cylinder

The lattice Boltzmann method (LBM) is employed to simulate the uniform flow past a circular cylinder. The performance of the two-dimensional LBM model on the prediction of force coefficients and vortex shedding frequency is investigated. The local grid refinement technique and second-order boundary condition for curved walls are applied in the calculations. It is found that the calculated vortex shedding frequency, drag coefficient and lift coefficient are consistent with experimental results at Reynolds nu...     

Simulation of 3D needle-tissue interaction with application to image guided prostate brachytherapy

To improve global control of disease and reduce global toxicity, a complex seed distribution pattern should be achieved with great accuracy during brachytherapy.However, the interaction between the needle and prostate will cause large deformation of soft tissue.As a result, seeds will be misplaced, sharp demarcation between irradiated volume and healthy structures is unavailable and this will cause side effects such as impotence and urinary incontinence.In this paper, a 3D nonlinear dynamic finite element s...     

仿真模拟系统在口腔医学实验教学中的应用

口腔医学院引进CLINSIM综合性临床仿真模拟教学实验系统,改革了传统的实验教学。学生和教师的反馈反映出对此系统的接受度较高,实用性较强,值得进一步推广应用。     

把“市场”建在实验室 把“企业”交给学生

相对于传统专业课程,ERP沙盘模拟实验课程是一种全新的体验式课程,它具有模拟情景、角色扮演、综合应用和寓教于乐等特点,注重激发学生的学习积极性,培养学生动手能力、学习能力、创新能力和团队协助能力。论述了ERP沙盘模拟实验的内容和优势,并讨论了如何开展ERP沙盘模拟实验课程教学。