Results of the test cases performed with STEM.
Test case 0 soft soil
Description: Test case 0 This is the base case with soft soil
Organization: Deltares
Date: 2025-06-30
STEM Version: 1.2.3
Test case 0 stiff soil
Description: Test case 0 This is the base case with stiff soil
Organization: Deltares
Date: 2025-06-30
STEM Version: 1.2.3
Test case 14 soft soil
Description: Test case 14 Effect of ballast stiffness, Young’s modulus increased by factor 2
Organization: Deltares
Date: 2025-07-14
STEM Version: 1.2.3
Test case 14 stiff soil
Description: Test case 14 Effect of ballast stiffness, Young’s modulus increased by factor 2
Organization: Deltares
Date: 2025-07-14
STEM Version: 1.2.3
Test case 16 soft soil, damping soil stiffness
Description: The stiffness part of the Rayleigh damping of the soil (a soft soil), project_parameters.settings.rayleigh_k, is increased from 0.786E-4 to 1.04E-4 Speed: this ran in about 61 hours (8 cores, i9, actual speed 4,5GHz)
Organization: Level Acoustics & Vibration
Date: 2025-07-15
STEM Version: 1.2.3
Test case 16 stiff soil, damping soil stiffness
Description: The stiffness part of the Rayleigh damping of the soil (a stiff soil), project_parameters.settings.rayleigh_k, is increased from 0.786E-4 to 1.04E-4 Speed: this ran in about 11 hours (20 cores, i9, actual speed 3,3GHz)
Organization: Level Acoustics & Vibration
Date: 2025-07-09
STEM Version: 1.2.3
Test case 21 stiff soil, cases 1 and 19 combined
Description: The second moment of inertia of the rail Izz, rail_parameters.I33 is doubled, that way doubling the vertical bending stiffness B = EI. The unsprung mass, uvec_parameters(“wheel_mass”) is doubled from 1500 to 3000 kg. Speed: this ran in about 11 hours (24 cores, i9, actual speed 3,3GHz)
Organization: Level Acoustics & Vibration
Date: 2025-07-10
STEM Version: 1.2.3
Test case 8 soft soil, Track irregularity
Description: The track irregularity parameter Av (scale factor of the variance) irr_parameters.Av, is decreased from 2.1E-5 to 2.1E-6 Speed: this ran in about 65 hours (10 cores, i9, actual speed 4,5GHz)
Organization: Level Acoustics & Vibration
Date: 2025-07-12
STEM Version: 1.2.3
Test case 8 stiff soil, Track irregularity
Description: The track irregularity parameter Av (scale factor of the variance) irr_parameters.Av, is decreased from 2.1E-5 to 2.1E-6 Speed: this ran in about 11 hours (12 cores, i9, actual speed 3,3GHz)
Organization: Level Acoustics & Vibration
Date: 2025-07-07
STEM Version: 1.2.3
