DATA SOLUTION FOR TURBINE SAFETY

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DATA SOLUTION FOR TURBINE SAFETY Adrian POPA 1 Ionut-Cristian SCURTU 2 Beazit ALI 3 George NOVAC 4 1 Associate Professor PhD. Eng. Mircea cel Batran Naval Academy, Constanta, Romania, adrian.

1 DATA SOLUTION FOR TURBINE SAFETY Adrian POPA 1 Ionut-Cristian SCURTU 2 Beazit ALI 3 George NOVAC 4 1 Associate Professor PhD. Eng. Mircea cel Batran Naval Academy, Constanta, Romania, adrian.popa@anmb.ro 2 Principal Instructor PhD. Eng. Mircea cel Batran Naval Academy, Constanta, Romania, ionut.scurtu@anmb.ro 3 Professor PhD. Eng Mircea cel Batran Naval Academy, Constanta, Romania, beazit.ali@anmb.ro 4 Associate Professor, PhD. Eng Mircea cel Batran Naval Academy, Constanta, Romania, george.novac@anmb.ro Abstract: Many efforts have been made in turbine safety regarding static and dynamic loads. Taking into account that turbines operate in various range of speeds and support a wide spectrum of engines, we will consider for Ansys analysis a simplified turbine. The paper presents modal analysis for the turbine based on Ansys software results. Key words: turbine, modal, ansys software, meshing. 1. Introduction A turbine is designed to increase air intake causing the engine to use more fuel and produce more power output. Turbines are high precision machine parts and they must be used accordingly. Even if high quality turbines are used, their expected performance cannot be achieved if they are not handled in safety conditions. Vibration can cause faults in any equipment we will investigate via Ansys software the turbine own frequencies. Presented data will allow correctly application to met maximum efficiency, reliability, durability and performance. 2. Material and geometry definition Figure 2. Turbine mesh on 3D CAD First Saved Last Saved Product Version Save Project Before Solution Save Project After Solution Saturday, October 15, 2016 Saturday, October 15, Release Figure 1. Turbine geometry 3D CAD 1. UNITS Unit System Angle TABLE 1 Metric (m, kg, N, s, V, A) Degrees rad/s Celsius Degrees 278

2 Rotational Velocity Temperature 2. GEOMETRY rad/s Celsius TABLE 2 Model (A4) > Geometry Object Name Geometry State Fully Defined Source Type DesignModeler Length Unit Meters Element Control Program Controlled Display Style Body Color Bounding Box Length X m Length Y m Length Z m Properties Volume e-004 m³ Mass kg Scale Factor Value 1. Statistics Bodies 1 Active Bodies 1 des Elements Mesh Metric ne Basic Geometry Options Parameters Parameter Key DS Attributes Named Selections Material Properties Advanced Geometry Options Use Associativity Coordinate Systems Reader Mode Saves Updated File Use Instances Smart CAD Update Compare Parts On Update Attach File Via Temp File Temporary Directory Analysis Type 3-D Decompose Disjoint Geometry Enclosure and Symmetry Processing TABLE 3 Model (A4) > Geometry > Parts Object Name turbo-rotor State Meshed Graphics Properties Visible Transparency 1 Suppressed Stiffness Behavior Flexible Coordinate System Default Coordinate System Reference Temperature By Environment Behavior ne Material Assignment Aluminum Alloy nlinear Effects Thermal Strain Effects Bounding Box Length X m Length Y m Length Z m Properties Volume e-004 m³ Mass kg Centroid X e-006 m Centroid Y e-002 m Centroid Z e-008 m Moment of Inertia Ip e-003 kg m² Moment of Inertia Ip e-003 kg m² Moment of Inertia Ip e-003 kg m² Statistics des Elements Mesh Metric ne 3. COORDINATE SYSTEMS TABLE 4 Model (A4) > Coordinate Systems > Coordinate System Object Name Global Coordinate System State Fully Defined Type Cartesian Coordinate System ID 0. Origin Origin X 0. m Origin Y 0. m Origin Z 0. m Directional Vectors 279

3 X Axis Data [ ] Y Axis Data [ ] Z Axis Data [ ] des Elements Mesh Metric ne 4. MESH 5. MODAL (A5) TABLE 5 Model (A4) > Mesh Object Name Mesh State Solved Display Display Style Body Color Defaults Physics Preference Mechanical Relevance 100 Shape Checking Standard Mechanical Element Midside des Program Controlled Sizing Size Function Adaptive Relevance Center Coarse Element Size Default Initial Size Seed Active Assembly Smoothing Medium Transition Fast Span Angle Center Coarse Automatic Mesh Based Defeaturing On Defeaturing Tolerance Default Minimum Edge Length e-005 m Inflation Use Automatic Inflation ne Inflation Option Smooth Transition Transition Ratio Maximum Layers 5 Growth Rate 1.2 Inflation Algorithm Pre View Advanced Options Advanced Number of CPUs for Parallel Program Controlled Part Meshing Straight Sided Elements Number of Retries Default (4) Extra Retries For Assembly Rigid Body Behavior Dimensionally Reduced Mesh Morphing Disabled Triangle Surface Mesher Program Controlled Topology Checking Pinch Tolerance Please Define Generate Pinch on Refresh Statistics TABLE 6 Model (A4) > Analysis Object Name Modal (A5) State License Full Physics Type Structural Analysis Type Modal Solver Target Mechanical APDL Options Environment Temperature 22. C Generate Input Only Solution (A6) TABLE 9 Model (A4) > Modal (A5) > Solution Object Name Solution (A6) State Solved Adaptive Mesh Refinement Max Refinement Loops 1. Refinement Depth 2. Information Status Done MAPDL Elapsed Time MAPDL Memory Used MAPDL Result File Size Post Processing Calculate Beam Section Results The following bar chart indicates the frequency at each calculated mode. 280

33. 6453.5 34. 6898.5 35. 6905.7 36. 7027.7 37. 7081.1 38. 7110. 39. 7411.1 40. 7745.4 41. 7875. 42. 8310.6 43. 8317.2 44. 8349.3 45. 8354.7 46. 8917.9 47. 8928.4 48. 9071.9 49. 9440.5 50. 9500.

4 Figure 3. Modal solution TABLE 10 Model (A4) > Modal (A5) > Solution (A6) Mode Frequency [Hz] e e e TABLE 11 Model (A4) > Modal (A5) > Solution (A6) > Solution Information Object Name Solution Information State Solved Solution Information Solution Output Solver Output Newton-Raphson Residuals 0 Identify Element Violations 0 Update Interval 2.5 s Display Points All FE Connection Visibility Activate Visibility Display All FE Connectors Draw Connections Attached All des To Line Color Connection Type Visible on Results Line Thickness Single Display Type Lines 281

5 Figure 4. Total deformation on 3D turbine Figure 6. Total deformation on 3D turbine Figure 7. Total deformation on 3D turbine Figure 5. Total deformation on 3D turbine 282

6 Figure 8. Total deformation on 3D turbine Figure 9. Total deformation on 3D turbine Figure 10.Total deformation on 3D turbine Conclusion In this study, a modal method was used for an actual case study simulation based on turbine. Due to high difficulties in making experimental tests on the presented turbine, the Ansys method of numerical simulation is preferable. The proposed Ansys simulation made on turbine is sufficiently precise in modal results. All results were presented as bearing deformation for a more visible effect of determined frequency. The Ansys simulation presented for turbine is a fast way to solve modal analysis for any bearing and it can be done using only a simple CPU unit with few resources. Frequencies obtained in simulation will not interfere with normal operation of the turbine. All frequencies presented should be avoided inside naval equipment using turbine from any source. Bibliography [1] Martinas, G, Arsenie A., Lamba M., Numeric geometry optimization of an wed for duct pressure angle, length and radius, Constanta Maritime University Annals Year XV, Vol

7 [2] Călimănescu I., Stan L. C., Computer fluid dynamics (CFD)study of a micro annular gear pump, Atom 2016, Conference Paper. [3] N. Tandon and A. Choudhury, An analytical for the prediction of the vibration response of rolling element bearings due to a localized defect, J. of Sound and Vibration, 205 (3) (1997) [4] Sergeev, S.V., Proshunin, D.V. & Sergeev, Y.S. Russ. Calculation of errors in hole machining by ansys software, Engin. Res. (2012) 32: 515. doi: /s x x [5] Wu T. Y. and Chung Y. L., Misalignment diagnosis of rotating machinery through vibration analysis via hybrid EEMD and EMD approach, Smart Materials and Structures, 18 (9) (2009) [6] Kiral Z. and Karagulle H., Simulation and analysis of vibration signals generated by rolling element bearing with defects, Tribology International, 36 (2003) [7] CAD available at 284

GOOD PRACTICE EXAMPLE: DESIGNING 100KN DELTA EYE PLATE

GOOD PRACTICE EXAMPLE: DESIGNING 100KN DELTA EYE PLATE Adrian POPA 1 Marian RISTEA 2 Ionut-Cristian SCURTU 3 Daniel MARASESCU 4 1 Assist prof. PhD Eng. Mircea cel Batran Naval Academy 2 Assist. prof. PhD.