排气歧管试验案例 Manifold Testing Example
康明斯的工程师设计和测试发动机，以承受从军事部署到重型工业现场等各种现实环境考验。康明斯工程师想要确切了解他们的零件在热载荷和机械载荷的组合下如何变形。这意味着他们的测试需要在发动机运行时进行......这会很热！
The engineers at Cummins design and test their engines to withstand real-world conditions, ranging from military deployments to heavy-duty industrial sites. Cummins engineers want to know exactly how their parts are deforming under the combination of thermal and mechanical loads. This means they have the need to perform their tests with the engines running… hot!
图示Figure 1. 发动机排气歧管照片Photograph of engine manifold.
由于在这些运行工况下产生的复杂应变场，常规应变计已不能满足康明斯的要求。而由于不确定的边界条件和加载的复杂性，FEA模拟也受到限制。利用VIC-3D系统，康明斯工程师能够获得详细的三维应变测量结果。这些测量是在发动机运转时在实际负载条件下进行的，而VIC-3D系统易于安装，对测量小部件和大型组件同样适用。使用DIC对热样件进行成像时必须小心，因为热浪会导致数据结果产生严重偏差。然而，解决这种潜在的偏差的一个简单方法就是利用风扇来搅动和混合容易聚集的冷、热空气。
Because of the complex strain fields produced under these conditions, conventional strain gages cannot satisfy Cummins’ requirements. FEA simulations are also limited, due to the uncertain boundary conditions and complexity of the loading. With the VIC-3D System, Cummins engineers were able to obtain detailed three-dimensional strain measurements. These measurements are made under real loading conditions while the engine is running. In addition, the VIC-3D System is easy to set up and can measure both small parts and large assemblies. Care must be taken when imaging hot specimens with DIC, because heat waves can severely bias data. However, a simple solution to this potential bias is to utilize a fan to move and mix the hot and cool air, which is easily integrated.
康明斯高级研究工程师 Paul Gloeckner 解释了VIC-3D系统的实用性：“这一工具允许我们做以前不可能做到的测量。它还使我们大大减少这些测试所需的时间。”
Paul Gloeckner, senior research engineer at Cummins, explains the usefulness of the VIC-3D System as follows: “This tool allows us to make measurements that were previously not possible. It has also allowed us to considerably reduce the time required for these tests.”
图示Figure 2. VIC-3D 排气歧管应变数据strain data of manifold.
Correlated Solutions now supports select IR cameras, which can be integrated with any quasi-static VIC-3D system. Temperature data from IR cameras can now be calibrated and synchronized with the DIC system, producing very robust and more informative data.
* 数据由康明斯发动机提供 Data Courtesy of Cummins
相关链接Links
View the VIC-3D page for more information about this technology.
Find out more about our IR system.
Download the VIC-3D flyer.
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