Förbättring av livslängd för avgassystemkomponenter vid provcellsdriftförhållanden

An engine test-cell is used to effectively conduct tests of engine components. This simplifies the installation of measuring equipment compared to if tests were conducted on a vehicle. However, the spatial requirements in a test-cell can cause the dislocation of the silencer from its intended position. In turn, the inlet pipe, which leads exhaust gases from the engine to the silencer, can get damaged. This study investigates the causes of failures, how failures manifest themselves and proposes solutions to prevent future failures. This is done through interviews with engineers and test-cell mechanics to build a broad understanding of involved components and what is currently done to prevent failures. Field studies have been conducted to further identify the issues. The investigated inlet pipe has been modelled in CAD to perform FEM simulation, both static and modal analyses. In an iterative process, multiple solutions were tried, to determine those solutions’ impact on the inlet pipe’s eigenfrequency. The results showed the importance of modifying the current installation to achieve a desirable eigenfrequency. This was found to be done through either use of a bracket to fix the inlet pipe in place, or the adding of mass on the inlet pipe to dampen the vibrations.