共查询到20条相似文献,搜索用时 9 毫秒
1.
为了得到蓄冰槽冷壁面在自然对流工况下的降温除湿特性以及环境温湿度、壁面形式和辐射对冷壁面传热传质的影响,建立了冷壁面自然对流传热传质二维模型,基于MATLAB采用控制容积法和连续性方程与动量方程联立的SIMPLE方法进行求解,并搭建试验台对此模型进行验证。结果表明:热质传递过程中,对流传热起主要作用,随着环境温湿度的增加,对流传热、传质和辐射传热都增大,但传质增加最快,在总换热量中所占比例也逐渐增大,壁面竖直和朝下的热值传递速度远快于壁面朝上,数值模拟结果与实验值拟合良好。研究结果可为蓄冰槽的自然降温除湿系统的应用提供参考。 相似文献
2.
Marcin Janicki Jedrzej Banaszczyk Gilbert De Mey Marek Kaminski Andrzej Napieralski 《Microelectronics Journal》2009,40(7):1135-1140
This paper presents dynamic thermal analyses of a power integrated circuit with a cooling assembly. The investigations are based on the examination of the cumulative and differential structure functions obtained from the circuit cooling curves recorded during transient circuit temperature measurements. The experiments carried out and the comprehensive study of the computed structure functions rendered possible determination of the interface contact resistance and the heat transfer coefficient values necessary for numerical thermal simulations illustrating the influence of these thermal model parameters on circuit temperature. 相似文献
3.
现有仿真设计软件功能还难以满足空天地一体化光电探测系统总体设计的需求,迫切需要开发一套光电探测场景仿真设计软件。通过对光电探测场景组成要素、探测链路与任务模式的分析,规划了仿真系统结构、功能与关键技术,设计了面向对象的数据结构属性方法与仿真计算流程,在VS2010+QT5.4环境下开发了光电探测场景仿真系统的基础版本。给出了美国STSS天基红外监视系统中段目标探测任务仿真实例计算结果和笔者团队的光电探测仿真技术主要应用成果。 相似文献
4.
5.
6.
Zheng Cui Deyong Chen Shanhong Xia 《Analog Integrated Circuits and Signal Processing》2002,32(1):29-35
Modelling of a silicon resonator as a pressure sensor is presented. The resonator is electrothermally excited and the resonance frequency shift is detected by a piezoresistive thin film detector. Computer simulation using the commercial MEMS software tool IntelliSuite is compared with analytical model. Various design aspects, such as the pressure sensitivity, electrothermal heating of vibrating beam, influence of detection current and damping effect are investigated. Silicon resonator sensors have been fabricated and measured. The characteristics predicted by computer simulation has been confirmed by experimental results. 相似文献
7.
在数字电路的教学中,集成计数器是一个重点无疑也是一个教学难点.本文以典型的74LS161N同步四位二进制计数器为例,用Multisim12软件对其进行功能仿真,并运用反馈清零法和反馈置数法设计十进制计数器,用同步和异步级联设计六十进制计数器来讲述任意进制计数器的设计方法,该设计方法灵活直观,可以非常直观的将电路和输出状态展现在屏幕上.通过该方法的学习,可加深学生对计数器的理解,提高学生的电路设计和实践动手能力. 相似文献
8.
介绍了TSUPREM-4集成电路工艺仿真系统的主要仿真功能及系统的深亚微米模型。以LDD结构的NMOS器件为例进行了二维工艺仿真,得到了NMOS器件的二维剖面结构、杂质浓度的等值分布描述以及相应的电学特性。 相似文献
9.
介绍了利用单片机设计的无线压力测量系统.系统主要包括压力采集、A/D转换和微控制器、无线发射和接收、数据处理和显示4部分.实际调试表明,系统性能达到了设计要求,传输可靠,可广泛应用于各种气压测量的场合. 相似文献
10.
This work provides a practical application of a coupled experimental-computational system devised for the full characterization of the thermal behavior of complex three-dimensional active submicron electronic devices. A thermoreflectance thermography (TRTG) technique is used to non-invasively measure the 2D surface temperature field of an activated device, with submicron spatial resolution. The measured planar temperature distribution field is then used as input for an ultra-fast inverse computational solution to derive the three-dimensional temperature distribution throughout the device. For the purposes of this investigation, test micro-heater devices were constructed on epitaxial layers of natural (Si) and isotopically pure (Si28) silicon. Then, all devices were activated and measured with the TRTG technique. In order to demonstrate the coupled experimental-computational system, the measured temperature fields of the samples whose thermal properties are known (Si) were used to extract critical physical parameters (the oxide layer thickness and the effective heater length). Then, since the devices with unknown thermal properties (Si28) share the same construction with the Si devices, the extracted parameters were used together with the measured planar temperature fields to derive the thermal conductivity of Si28. The extracted oxide layer thickness and thermal conductivity of Si28 compared very closely to values obtained by other independent direct methods. 相似文献
11.
给出了机载雷达杂波模拟器的设计和实现方案,该模拟器采用专用软件及专用硬件相结合,实时与非实时相结合的方法,产生的杂波能够满足所要求的功率谱特性,其实测结果和仿真结果能够符合。为机载雷达杂波的模拟和工程实现提供了可行的方法。 相似文献
12.
针对作战对抗环境下侦察情报数据仿真模拟需求,重点从组件化仿真建模与多维想定编辑入手,提出了一种灵活、可配置的侦察情报数据仿真系统设计及其实现方法.从装备与行为两方面对侦察实体进行抽象,建立组件化仿真模型;并结合实战应用场景从组织、任务、空间、时间与信息交互等多个维度开展侦察行动预案设计,驱动仿真引擎加载相关的规则模型进行仿真推演与解算,输出最终的仿真模拟结果.仿真模拟试验结果证明了该方法的实用性与有效性. 相似文献
13.
14.
15.
16.
17.
18.
19.
以车用镀锌钢和6016铝合金为研究对象,利用Ansys Workbench14.5仿真平台对焊接过程进行热固耦合数值求解,进而得到给定工艺参数条件下的温度场和应力场分布。热电偶同步测温实验可以保证温度场计算的准确性,通过热应力耦合分析可以得到应力场。应力场分布表明,应力主要集中在焊缝区域,实验结果恰好证实了这一点。观察焊缝区域的微观组织发现,该区域出现许多细小的裂纹,说明了热应力集中是出现微细裂纹的主要原因。文章根据温度场和应力场的分布对工艺参数进行分析,以为实际的工程应用提供参考。 相似文献