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热仿真加快垂直水平两用散热片设计


热仿真加快垂直/水平两用散热片设计

Crane Aerospace 使用 Flotherm 热仿真软件研发一种新型航空电子垂直/水平两用散热 片 Crane 航空&电子公司使用 Flomerics 公司的 Flotherm 热仿真软件研发一种在垂直或 水平方向工作的新型散热片。 该散热片是为一商用航空公司的直流电子系统设计。 使用传 统的设计和测试方法研发出一种全新的符合规格要求的散热片需投入长时间。然而 Crane 公司工程师 Mark Resler 利用热仿真软件模拟了不同的散热片结构,并最终选取一款性能 最好并能配置于固定板或支架上的与众不同的设计。 通常这种系统会使用在机身外墙的翅式散热片。 在本案例中, 散热片原本的设计规格 是在水平或垂直位置工作但不是垂直/水平两用。 Resler 与其他 Crane 工程师集体研讨并设 计了六种不同的散热片构造,分别为:1)片式直立型;2)短翅型;3)长翅性;4)45 度翅型;5)短凹凸翅型带外环法兰;6)45度翅型带外环法兰。传统评估以上概念的方法 是分别建模和测试各性能。该方法成本昂贵,时间消耗久并可能导致无法按时交出产品。 利用 Flotherm 的热仿真使得 Resler 在相比较低的成本下可迅速评估大量的设计概念。 “Flotherm 迅速生成模型并能便捷地更改边界条件、环境条件和重力方向。”Resler 说:“我 利用这些功能从不同高度和不同周围温度为六个概念建模。”Resler 利用 Flotherm 生成列 阵功能迅速生成这些模型。 Resler 为每一设计做垂直方向和水平方向两次仿真。 仿真结果显示片式直立型设计在 垂直和水平两方向均表现出最好性能。之后 Resler 再次模拟了片式直立型散热片的性能

以探讨支架最合理的长度。 “对不同设计参数建模和评估要花费很大的成本和投入很多时间,”Resler 总结:“热 仿真帮助我们在较短时间优化散热片热性能和其重量, 并使我们通过优化设计将性能提升 到在我们的时间限制内无法完成和评估的新层次。”

Thermal Simulation Speeds Design of Versatile Vertical/Horizontal Heatsink

Crane Aerospace used FloTHERM thermal simulation software to develop an unusual avionics heatsink that works in the vertical or horizontal orientation May 2008 Crane Aerospace & Electronics used Flomerics' FloTHERM thermal simulation software to develop an unusual heatsink that works in the vertical or horizontal orientation. The heatsink is for a DC power subsystem for a commercial airliner. Developing an entirely new heatsink geometry that would have met the performance requirements would have taken an enormous amount of time using conventional build and test methods. Instead Crane Mechanical Engineer Mark Resler simulated a range of different heatsink

configurations using thermal simulation software. He determined that an unusual design with a plate and standoffs provided the best performance. Normally, this type of system would use fin type heatsinks on the exterior sidewalls of the enclosure. But in this case the default design would work only in the horizontal or vertical orientation but not in both. Resler brainstormed with other Crane engineers and developed six different alternative heatsink configurations. They included: 1) Plate and standoffs. 2) Short fins. 3) Long fins. 4) 45 degree angle fins. 5) Short flanged fins with outer flange. 6) 45 degree angled fins with outer flange. The conventional approach to evaluating these concepts would be to build prototypes and test their performance. But this approach is expensive and time-consuming and would not have met the customer schedule. Thermal simulation with FloTHERM made it possible for Resler to evaluate a wide range of designs quickly and at a relatively low cost. "FloTHERM quickly generates a model and makes it easy to change boundary conditions, environmental conditions and gravitational direction," Resler said. "I used these capabilities to model all six geometries at various altitudes and ambient temperatures." Resler used the pattern generator in FloTHERM to quickly produce the fins. Resler ran the simulation results twice for each design, in the horizontal and vertical orientations. The simulation results showed that the plate and standoff design provides the best overall performance for both horizontal and vertical mounting. Resler then proceeded to perform a trade study that involved simulating the performance of the plate and standoff design while varying the length of the standoff. "Building and testing several different prototype configurations would have had a significant cost and schedule impact," Resler concluded. "Thermal simulation allowed us to optimize the heatsink thermal performance and weight in a very short time period. Thermal simulation also enabled us to optimize the design to improve its performance to a level that would have been impossible to achieve with the build and test method within our schedule constraints."



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