Tillämpad mekanik. Beräkningsingenjören problemlösaren Den generella specialisten

Transkript

1 Tillämpad mekanik Beräkningsingenjören problemlösaren Den generella specialisten

2 Beräkning finns överallt Ökande behov i alla brancher

3

4

5 Spår mekanik Hållfasthetslära/FEM Fluidmekanik/CFD

6 Strukturmekanik

7 Krocksimulering

8 Topologioptimering

9 A new swap- body design OLD NEW

10 LiU-Alfredsson-PLS Prototype 40 Tonnes, twice a week to Norway. Månad L/mil (ref) L/mil (mod) juli 3,18 2,82 Aug 3,05 2,86 Sep 3,33 2,84 Okt 3,3 2,97

11 Materialprovning

12 Svepelektronmikroskop

13 IR & TBC: felsökning

14 Pressure original M6 wing Pressure M6 wing

15 Formoptimering

16 Power From Tidal and Ocean Current- Minesto From Parameterized CAD to FEM analysis- Design OpMmizaMon 6. StaMc Structural Analysis 1. Geometry Import From CATIA 5. ImplemenMng Fluid Forces 2. Meshing 4. CFD- Post processing 3. CFX- Pre Set Up Workflow for Performing CFD-FEM Analysis

17 Power From PANEL Tidal and Ocean Current-Minesto TEMPERATURE From Parameterized CAD to FEM analysis- Design Optimization Introduction A number of panels containing switches and indicators exist in the SAAB JAS 39 Gripen aircraft. These are usually placed in close hot areas and are therefore in risk to be overheated and cause failures if they not are exposed to sufficient cooling. The goal of this study is to verify that this kind of panel not risks to be overheated during operation. Results Figure 3. Maximum temperature in the components. Figure 4. Top Right: Worst case for aluminium components. Aerodynamically heated surfaces 1. Geometry Import From with 6. StaMc Structural CATIA Analysis T = 95 C Figure 1.Complete Geometry. 5. ImplemenMng Group 0 Petter Ekman 2. Meshing Fluid Forces Bottom Right: Worst case for plastic components. Method The Geometry was simplified in order to be able to create a mesh. A CFD (Computational Fluid Dynamics) Simulation was made on it in order to get a view over the flow condition. The boundary conditions were set after the flow field with heat flux and heat coefficients representing the flow and radiation. A mesh independency was made in order to verify non mesh dependent results. 4. CFD- Post processing 3. CFX- Pre Set Up Concluisions A heat transfer simulations has been made for a panel installed in a military aircraft. Maximum temperature for the electric components is just above 80 C and occurs when the air flow temperature is 70 C and aluminium is used for the components. 80 C should however, not be a problem even for plastic details as the melting temperature usually is around 120 C for plastics. The air flow temperature affects the component temperatures the most and thereby is the need of higher speed flows not large. However, with slow moving air the risk of temperature rise in the air which will lead to higher component temperature a larger risk. Better cooling could easily be possible (at least in an aerodynamic point of view) Figure 2. Air flow velocity for the simplified by modifying the plate so more of the flow hits the components instead of panel at bulk air flow velocity of 2 m/s. the plate Workflow for Performing CFD-FEM Analysis Air flow velocity [m/s]

18 Import Introduction & Apply to Tutorials Variable in Dependent TMMV54 Data in CFX-Pre Computational Heat Transfer Introduction to Tutorials in TMMV54 Applied Thermodynamics and Fluid Mechanics By Magnus Andersson

19 Tillämpad mekanik, termin 1 Op@mering för ingenjörer Värmeöverföring Fluidmekanik Deforma@on och broc Polymerer Läca konstruk@oners mekanik Mekanikmodeller

20 Tillämpad mekanik, termin 2 Kon@nuumsmekanik FEM e KM Nya material Läca konstruk@onsmaterial CFD CFD e Projektledning och organisa@on Flerkroppsmekanik & Robo@k Aerodynamisk formop@mering

21 Tillämpad mekanik, termin 3 Avancerad material och beräkningsmekanik Skademekanik & Livslängdsanalys Gasturbinteknik Strukturop@mering Aerodynamik Projektkurs avancerad maskinteknik 12 hp

22 Spår mekanik Fluid Hållfashet

23 Spår mekanik Fluid Fluid- Structure Hållfashet Materialmekanik

24 Gör något bra!