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A C++ program is developed for composing the stiffness matrix of the temperature field, saving it in changing bandwidth method and calculating the linear algebraic function group through using the Gauss eliminating method. A module for drawing the color fringe of tire temperature field is created, which makes the result more visual. Taking the 9.00-20 cross-ply tire on CA1092 as an example, the finite element numerical simulation analysis of automobile tire 2-D steady temperature field is completed. Through comparing the result with the analysis data by ANSYS, this software is proved to be capable of the modeling, calculating and post-processing of FEA of automobile tire 2-D steady temperature field.
采用C++语言完成了温度刚度矩阵的总体合成及其一维变带宽存贮,以及线性代数方程组高斯消去法求解等工作,采用C++语言实现了汽车轮胎二维稳态温度场云纹图的绘制,使得计算结果更加直观,也更能形象地显示汽车轮胎二维稳态温度场的分布状况,以CA1092(原CA142)五吨载货汽车用9.00-20尼龙斜交胎为例,进行了汽车轮胎二维稳态温度场有限元数值仿真分析,通过与ANSYS分析结果进行比较,说明所开发的有限元建模、求解以及后处理软件能够用于汽车轮胎二维稳态温度场有限元分析。
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The main work and the originality points of this dissertation could be concluded as the following parts:(1) To analyze systematically the mathematical model of LES of air flow in great space, under the case of isothermal and non-isothermal, as well as the combined action of buoyancy and strain. Some basic problems are studied about the LES application into airflow simulation of great space, such as boundary conditions, spatial difference scheme and time advancing scheme, time step etc., which creates the basis for the LES application to indoor airflow simulation.(2) Both the instantaneous and time averaged flow field of great space with multiple jets under isothermal and non-isothermal cases are explored with large eddy simulation method, and also discussed the dynamic characteristics and the law of fluidflow in the great space.(3) Based on the results of LES of the great space and the Fanger thermal comfort indexes, it is brought forward the concept of the series of dynamic thermal comfort evaluating indexes, which could be divided into thermal comfort index with time averaged properties PD, PPD, PMV, thermal comfort index with instantaneous properties IPD, IPPD, IPMV, and time averaged thermal comfort indexes TAPD, TAPPD, TAPMV, and transient situations time averaged thermal comfort indexes TTAPD, TTAPPD, TTAPMV. The differences among them and the calculation methods are discussed, and the four kinds of indexes are calculated with the thermal comfort index PD as an example.(4) Based on the LES results it is discussed the hot air stratification phenomena in air-conditioned buildings in the case with air supply and return registers on the ceiling and the case on the sidewall. The fundamentals of the hot air stratification are studied and the relations of estimating hot air stratification are brought forward.(5) With the advanced apparatus such as hot wire film anemometer IFA300 and laser particle field anemoscope, corresponding model test and site measurements have been done, which are compared with the simulation results and LES is proved a very promising method in air flow simulation indoor.
本文主要工作既创新点体现在以下几个方面:(1)系统分析了等温、非等温和考虑剪切力与浮升力综合作用的高大空间大涡模拟数学模型,并研究了高大空间大涡模拟在室内气流仿真应用中的一些基本问题,如边界条件、空间离散格式和时间推进格式、时间步长选择等问题,为大涡模拟在室内气流计算中的广泛应用打下了基础;(2)首次用大涡模拟方法研究了高雷诺数下高大空间多射流在等温、非等温情况下的瞬时流场和时均流场分布,并探讨了多射流流场的动态特性和流动规律;(3)基于大涡模拟的动态仿真结果和Fanger的热舒适指标,首次系统地提出了动态热舒适评价指标体系的概念:即基于时间平均参数的热舒适指标PD、PPD、PMV;基于瞬时参数的瞬时热指标IPD、IPPD、IPMV;基于时间平均热舒适指标TAPD、TAPPD、TAPMV;以及沿行动迹线的时间平均热舒适指标TTAPD、TTAPPD、TTAPMV,并分析了四类热舒适指标的差异性和计算方法,还以PD值为例对四类指标分别进行了计算;(4)基于数十种工况下空调房间大涡模拟的结果,研究了空调建筑上送上回和侧送侧回两种情况下热分层现象,并探讨了热分层的基本规律,首次提出了避免热分层现象的判断公式;(5)在暖通空调领域,首次使用IFA300热线风速仪、激光粒子速度场仪等先进设备,完成了与大涡模拟相对应的模型试验,并把实测结果与仿真结果进行了对比,说明LES在室内气流仿真方面是一种很有前景的方法。
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The low-level wind field displayed cyclonic character on the north part of the squall line, whereas on its south part the wind field pattern was anticyclonic, with clear convergence of westerly and southeast inflows in between.
飑线不同位置的水平风场结构有很大不同,在飑线北端,低层是气旋性辐合风场,飑线南端是反气旋性辐合风场,而中部沿强对流窄带的前部是偏西和东南风的风场辐合。
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And the energy balance equation is applied to describe the temperature field axial orientated.
对流道的径向瞬态温度场分布进行差分求解,对流道轴向的温度分布运用能量平衡方程建立数学模型,并采用松弛迭代求解;最后,考虑流动和冷却过程的温度场分布,对流道径向和轴向温度场的计算结果进行了耦合分析,解决了长期以来只能依靠经验计算热流道温度场的局限。
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EMPcircular sliding bearing is a new type of bearing. Because of the special properties of synthetic material used in bush, its temperature field and pressure field are different with that of traditional bearing with metal bush.
弹性金属塑料瓦径向滑动轴承是一种新型的轴承,由于轴瓦所采用的复合材料的特殊特性使得其油膜温度场和压力场分布情况与传统金属瓦轴承的油膜温度场和压力场分布情况有所不同。
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Then, the two third he danced with Miss King, and the two fourth with Maria Lucas, and the two fifth with Jane again, and the two sixth with Lizzy, and the Boulanger --
他第三场舞是跟金小姐跳的,第四场跟玛丽雅·卢卡斯跳,第五场又跟吉英跳,第六场是跟丽萃跳,还有'布朗谢'。
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Then, the two third he danced with Miss King, the two fourth with Maria Lucas, the two fifth with Jane again, the two sixth with Lizzy, the Boulanger --
他第三场舞是跟金小姐跳的,第四场跟玛丽雅·卢卡斯跳,第五场又跟吉英跳,第六场是跟丽萃跳,还有'布朗谢'。
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A "time-dependent relaxation" method is proposed to accurately implement given photospheric footpoint displacements and force-free conditions. The method is applied to analyzing the energy buildup of coronal magnetic fields, and the numerical results confirm the Aly conjecture (the magnetic energy of the force-free field is bounded above by the fully-open field energy), and extends it from fully-open to partially-open force-free fields.
提出计算无力磁场的"时变松弛"方法,能精确实现光球足点位移和无力条件;采用该方法分析日冕磁场的剪切储能,验证了Aly猜想(无力场磁能以全开放场磁能为上限),并将该猜想由全开放无力场推广至部分开放无力场。
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Years old, he became the lakers in the history of the third season, averaged 30 points a player, and that which he had 13 consecutive games scoring 35 points or more out the second-highest nba history, michael jordan won three games from the record - chamberlains 14 games shy of a ......
24岁那年,他成为了湖人队史上第三个赛季场均得分达到30分的球员,而这其中他连续13场得分在35分以上,列nba历史第二高,胜出乔丹3场,离最高纪录--张伯伦的14场也仅差一场。。。。。。
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The design principle of the laser receiver with wide FOV for the laser command guidance and laser-beam riding guidance is introduced. A mathematic model of receiving light field is presented. The formula for the viewing angle of the detecting optical system was derived according to the diffraction light field of the oblique incidence parallel light. Taking a detecting optical system with the collecting objective for example, the design characteristic that the receiving optical system needs not only an extra large relative aperture but also an unvignetting receiving performance is discussed on the premise of meeting the requirement of 1064nm WFOV laser receiver.
介绍激光指令制导和激光驾束制导的大视场激光接收机的设计原理,给出接收光场的数学模型,由斜入射平行光的衍射光场推出探测光学系统的视场角公式,根据1064nm大视场激光接收机技术要求,以聚光物镜型探测光学系统为例,探讨接收光学系统既须具备特大相对孔径,又须具备无晕接收性能的设计特点,采用窄带干涉滤光镜进行光学滤波降噪。
- 推荐网络例句
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They weren't aggressive, but I yelled and threw a rock in their direction to get them off the trail and away from me, just in case.
他们没有侵略性,但我大喊,并在他们的方向扔石头让他们过的线索,远离我,以防万一。
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In slot 2 in your bag put wrapping paper, quantity does not matter in this case.
在你的书包里槽2把包装纸、数量无关紧要。
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Store this product in a sealed, lightproof, dry and cool place.
密封,遮光,置阴凉干燥处。