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Our approach
We use KISSsoft software, calculations along DIN and ISO standards (implemented in Excel and MathCad) and FEM analysis (ABAQUS). Combining different calculation methods, we can handle simple and complex problems alike. FEM calculations are only used to determine rolling element loads and to account for the elasticity of adjacent structures. Non linear spring stiffness of rolling elements is taken into account. Stress calculations are then done more accurately using formulas based on Hertzian theory including modifications for edge stresses. These stresses are then the basis for a static or life rating.
Our calculations are in line with
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ISO76, ISO281 |
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DIN ISO 281-4 / ISO TS 16281 |
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ISO81400 |
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NREL DG 03 |
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Harris/Kotzalas, "Essential Concepts of Bearing Technology" and "Advanced Concepts of Bearing Technology" |
Bearing Calculation
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Rolling element force distribution as a function of bearing geometry, roller geometry and clearance |
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Rolling element stress distribution as a function of load distribution and rolling element corrections |
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Bearing stiffness calculation |
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Considering elastic rings or infinitely stiff rings |
Bolting and Gearing
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Gear rating along ISO6336, DIN3991, AGMA2001, AGMA6004 |
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With nominal load or LDD, including alternating loads |
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Documentation and rating in line with GL, DNV, TüV, DEWI certification rules |
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Bolt rating using VDI2230 |
Recent projects
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Analysis of a >5m slewing bearing for mining application, Korea |
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Re-calculation for certification, wind turbine pitch/yaw bearing, India/Italy |
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Analysis review and certification assistance, pitch/yaw bearing, India/Korea |
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Comparative analysis for wind turbine pitch and yaw bearings, Germany |
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Analysis methodology study for slewing rings, Spain |
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Various calculations for slewing ring gearboxes, Japan, Italy, India, Germany |
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