Results of the test cases performed with STEM.
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
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
Case 1 - stiff soil
Description: Doubled the rail stiffness (I33)
Organization: We-Boost
Date: 2025-07-09
STEM Version: 1.2.4.a
Case 1 - soft soil
Description: Doubled the rail stiffness (I33)
Organization: We-Boost
Date: 2025-06-30
STEM Version: 1.2.4.a
Case 3 - stiff soil
Description: This is the file for test 3 stiff soil, changed the mass of the sleepers with a factor 2. The actual STEM version is 1.2.3a0 but this is not supported by the validator, therefore the version here is changed to 1.2.3, during the STEM session I was told 1.2.3a0 was oke to use.
Organization: Cohere Consultants
Date: 2025-08-25
STEM Version: 1.2.3
Case 3 - soft soil
Description: This is the file for test 3 soft soil, changed the mass of the sleepers with a factor 2. The actual STEM version is 1.2.3a0 but this is not supported by the validator, therefore the version here is changed to 1.2.3, during the STEM session I was told 1.2.3a0 was oke to use.
Organization: Cohere Consultants
Date: 2025-08-25
STEM Version: 1.2.3
Case 4 - soft soil
Description: Changed the coordinates of the embankment point: (3.5, 2.2, 0.0) -> (5.0, 2.2, 0.0)
Organization: Movares
Date: 2025-08-19
STEM Version: 1.2.3
Case 5 - soft soil
Description: Test case 5 Effect of styrofoam deepwall in soft soil Material properties: E=5e6 N/m², rho=32 kg/m³, v=0.495
Organization: Witteveen+Bos
Date: 2025-08-12
STEM Version: 1.2.3
Case 5 - stiff soil
Description: Test case 5 Effect of styrofoam deepwall in stiff soil Material properties: E=5e6 N/m², rho=32 kg/m³, v=0.495
Organization: Witteveen+Bos
Date: 2025-08-12
STEM Version: 1.2.3
Case 6 - stiff soil
Description: Hard soil model with primary damping increased by factor of 2.
Organization: Ricardo Nederland BV
Date: 2025-08-27
STEM Version: 1.2.3
Case 6 - soft soil
Description: The primary damping of the bogey (var:“wheel_stiffness”) is increased by a factor of 2. The simulation is run on the soft-soil domain.
Organization: Ricardo Nederland B.V
Date: 2025-08-11
STEM Version: 1.2.3
Case 7 - stiff soil
Description: Young modulus of top layer divided by a factor 2, stiff soil input file
Organization: M+P
Date: 2025-07-25
STEM Version: 1.2.3
Case 7 - soft soil
Description: Young modulus of top layer divided by a factor 2, soft soil input file
Organization: M+P
Date: 2025-07-25
STEM Version: 1.2.3
Case 8 - soft soil
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
Case 8 - stiff soil
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
Case 9 - stiff soil
Description: Train velocity increased from 140 km/h to 160 km/h
Organization: Cauberg Huygen
Date: 2025-08-30
STEM Version: 1.2.3
Case 9 - soft soil
Description: Train velocity increased from 140 km/h to 160 km/h
Organization: Cauberg Huygen
Date: 2025-08-30
STEM Version: 1.2.3
Case 10 - stiff soil
Description: This is the file for test 10 (stiff soil): Comparison between rail types E54 and E60
Organization: ProRail
Date: 2025-08-29
STEM Version: 1.2.3
Case 10 - soft soil
Description: This is the file for test 10 (soft soil): Comparison between rail types E54 and E60
Organization: ProRail
Date: 2025-08-29
STEM Version: 1.2.3
Case 11 - stiff soil
Description: Test 11, PSS on stiff soil. PSS young modules is assumed to be 10x stiffer than ballast and about 5x stiffer than very stiff sand
Organization: ProRail
Date: 2025-08-26
STEM Version: 1.2.3
Case 11 - soft soil
Description: Test 11, PSS on soft soil. PSS young modules is assumed to be 10x stiffer than ballast and about 5x stiffer than very stiff sand
Organization: ProRail
Date: 2025-08-26
STEM Version: 1.2.3
Case 12 - soft soil
Description: Soft soil double the stiffness of the railpad
Organization: ProRail
Date: 2025-08-28
STEM Version: 1.2.3
Case 12 - stiff soil
Description: Stiff soil double the stiffness of the railpad
Organization: ProRail
Date: 2025-08-28
STEM Version: 1.2.3
Case 13 - soft soil
Description: This is the file for test 13 (soft soil) with ditch with clay (thus no ditch)
Organization: ProRail
Date: 2025-08-29
STEM Version: 1.2.3
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
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
Case 15 - soft soil
Description: This is the file for test 15 soft soil
Organization: TNO
Date: 2025-08-01
STEM Version: 1.2.3
Case 16 - soft soil
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
Case 16 - stiff soil
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
Case 17 - soft soil
Description: This is the file for test 17
Organization: TNO
Date: 2025-07-22
STEM Version: 1.2.3
Case 17 - Stiff soil
Description: This is the file for test 17
Organization: TNO
Date: 2025-07-17
STEM Version: 1.2.3
Case 19 - soft soil
Description: This is the file for case 19 change wheel mass on soft soil. This is the calculation with the masss of the wheel halved.
Organization: ProRail
Date: 2025-08-31
STEM Version: 1.2.3
Case 19 - stiff soil
Description: This is the file for case 19 change wheel mass on stiff soil. This is the calculation with the masss of the wheel halved.
Organization: ProRail
Date: 2025-09-07
STEM Version: 1.2.3
Case 20 - soft soil
Description: Decreased depths of peat and clay layers so that the sand soil layer is much closer to the surface.
Organization: We-Boost
Date: 2025-08-25
STEM Version: 1.2.4.a
Case 21 - stiff soil
Description: Cases 1 and 19 combined. 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
