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MCCT LABORATORY

Mechanical and Climatic Calibration and Testing Laboratory

SERVICES

TESTS and CALIBRATIONS

A. Tests to determine the elastic characteristic of controlled deformable elements

Reference documents:

  • NTF 67-001:2006 – Railway vehicles. Technical requirements for the planned overhaul and repair of the 2,100 hp diesel-electric locomotive;

  • NTF 67-003:2008 – Railway vehicles. 5,100 kW and 3,400 kW electric locomotives. Technical requirements for planned overhauls and repairs;

  • NTF 82-002:2004 – Railway vehicles. Collision, traction and tying devices. Repair technical requirements;

  • OMT 410:1999,on the authorization of testing laboratories and testing of stands and special devices for the verification and testing of railway products used in the construction, modernization, operation, maintenance and repair of railway infrastructure and rolling stock, specific to rail and subway transport;

  • SR EN ISO/CEI 17025:2018 – General requirements for the competence of testing and calibration laboratories;

  • EA-4/02 M: 2013 – Evaluation of the Uncertainty of Measurement in Calibration.

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Secondary suspension coil springs test

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Primary suspension metalwork test

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Testing of the shock absorber of the connecting vehicle of railway vehicles

B. Tests to determine the damping characteristics of hydraulic and friction dampers

Reference documents:

  • NTF 67-003:2008 – Railway vehicles. 5,100 kW and 3,400 kW electric locomotives. Technical requirements for planned overhauls and repairs;

  • NTF 81-007:2009 – Railway vehicles. Technical requirements for overhaul and repair of shock absorbers;

  • OMT 410:1999, on the authorization of testing laboratories and testing of stands and special devices for the verification and testing of railway products used in the construction, modernization, operation, maintenance and repair of railway infrastructure and rolling stock, specific to rail and subway transport;

  • SR EN ISO/CEI 17025:2005 – General requirements for the competence of testing and calibration laboratories;

  • EA-4/02 M: 2013 – Evaluation of the Uncertainty of Measurement in Calibration.

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Principle of operation:

The stand is intended to determine the F-S and F-V (damping force-stroke / damping force-speed) characteristics of hydraulic and friction shock absorbers, in particular those which equip railway vehicles, including locomotives and electric frames. The shock absorber is tested in the position corresponding to the normal operating position, respectively in the vertical position or in the horizontal position.

The test stand consists of an actuating module, equipped with an electric motor type ME160-L4-B5-15KW / 1500RPM which drives a mechanical reducer type A602-UH60-7.9-P160, obtaining a nominal speed of output 3.16 Hz. The rotational movement is transmitted to a flywheel actuating a connecting rod whose free end performs a translational movement imposed by a linear guide system consisting of 600mm TKD35-G3-HJ type sliding rails and KWE35-G3-V1 linear trolleys . The linear stroke is obtained from the rotational movement of the flywheel, on the principle of the connecting rod-crank mechanism, the crank arm being adjustable, in the range 0 ÷ 200mm.

The change of the rotation frequency is made with a frequency inverter type ACT401-25 A 15KW, which allows the change in distinct stages of the frequency at the level of the electric motor in the range 0 ÷ 50Hz, respectively at the output of the reducer in the range 0 ÷ 6.32Hz.

Changing the stroke of the test damper is done manually, at the beginning of the tests, and the frequency is adjusted by software, in distinct steps. The stroke and test frequency are characteristic of each type of shock absorber and are required by the technical specification.

The technical performance of the LIMC stand for the shock absorber test is:

  • Maximum length of the shock absorber for horizontal tests: maximum 2000 mm;

  • Maximum length of the shock absorber for tests in the vertical direction: maximum 1500 mm;

  • Maximum stroke: 400 mm;

  • Test frequency: 0 ÷ 5 Hz;

  • Maximum dissipated power: 12 kW.

C. Tests to verify the shock and vibration resistance of electromechanical equipment

Within the Mechanical and Climate Testing Laboratory, LIMC-Softronic performs shock and vibration tests of electromechanical, pneumatic, electrical and electronic equipment to be fitted to railway vehicles, in accordance with the provisions of the regulations in the field, or, at the request of the beneficiary, in accordance with the actual requirements of the installation site.

Reference documents:

  • SR EN 61373: 2011 – Railway applications. Rolling stock equipment. Shock and vibration tests;

  • EN 60068-2-57:2013 – Environmental testing – Part 2-57: Tests – Test Ff: Vibration. Time-history and sine-beat method;

  • EN 60068-2-64:1995 – Environmental testing – Part 2: Test methods – Test Fh: Vibration, broad-band random (digital control) and guidance;

  • EN 60068-2-6:2008 – Environmental testing – Part 2-6: Tests – Test Fc: Vibration (sinusoidal);

  • EN 60068-2-47:2005 – Environmental testing – Part 2-47: Tests – Mounting of specimens for vibration, impact and similar dynamic tests;

  • EN 60068-3-8:2003 – Environmental testing – Part 3-8: Supporting documentation and guidance – Selecting amongst vibration tests;

  • EN 60068-2-27:2009 – Environmental testing – Part 2-27: Tests – Test Ea and guidance: Shock;

  • OMT 410:1999, on the authorization of testing laboratories and testing of special stands and devices for the verification and testing of railway equipment used in the construction, modernization, operation, maintenance and repair of railway infrastructure and rolling stock, specific to rail and subway transport;

  • SR EN ISO/CEI 17025:2005 – General requirements for the competence of testing and calibration laboratories;

  • EA-4/02 M: 2013 – Evaluation of the Uncertainty of Measurement in Calibration.

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Description of the shock and vibration test system:

The shock and vibration test system consists of the following components: the electrodynamic vibrator ET-10-240; extension surface (vertical) of test surface HE500; power amplifier; vibrator cooling fan; controller that includes the control accelerometer and programs for generating different test profiles: self / random / shock.

ET-10-240 electrodynamic vibrator, sine force (peak) 10 kN; random force (rms) 10 kN; shock force 20 kN; frequency range 5 - 3000 Hz; maximum displacement (p-p) 51 mm; maximum speed 1.8 m / s; maximum acceleration 1000 m / s2; armature resonance 2500 Hz; maximum test mass 300 kg; reinforcement diameter 240 mm.

SDA-10 power amplifier, rated output capacity 10 kVA; 90% amplifier efficiency.

B-1000 blower, max. 4 kW; air flow min. 0.33 m3 / s; air pressure 3.5 kpa.

Vibration controller, is designed to generate the main types of test profiles: self / random / shock. The software allows the visualization, monitoring, storage and analysis of vibrations and parameters. Main technical characteristics: frequency range: DC 0 ~ 5,000 Hz; resolution: max3200 lines; maximum input voltage: ± 10 V; inputs: 2, amplifier output: 1; test profiles: self / random / shock / RSTD.

For the mechanical stress test in accordance with the operating requirements, the following equipment shall be added:

  • LAN-XI 3160 A-042 data acquisition system, Bruel & Kjaer, 4 input channels, 56 kHz, 24bit, 2 analog output channels, 56 kHz, 24bit;

  • LV 103 power preamplifier, 100W power, 3Hz-10Hz frequency range;

  • PulseReflex, Bruel & Kjaer, software for post-processing and generating analog signals from recorded data files.

D. Climate tests

Within the Mechanical and Climate Testing Laboratory, LIMC-Softronic performs cold and dry heat tests on electromechanical, pneumatic, electrical and electronic equipment, which are to be mounted on railway vehicles, in accordance with the provisions of the regulations in the field.

Reference documents:

  • SR EN 60068-2-1:20007 – Environmental testing part 2-1 test A: Cold.

  • SR EN 60068-2-2:20007 – Environmental tests part 2-2 test B: Dry heat.

  • SR EN 50155 – Railway applications - Electronic equipment used on rolling stock.

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Description of the climate test facility

The main functional characteristics of the thermostatic enclosure are:

  • Useful volume: 280 dm3;

  • Useful dimensions of the thermostatic enclosure: 720 x 690 x 560 mm.

  • Temperature variation range: -400C … 180C;

  • Humidity variation range: 10 … 95 % r

The thermohygrostatic chamber is equipped with controllers with the resolution of setting and displaying the temperature and the relative unit of 0.10C, respectively 0.1% r. It has a digital thermometer, with the display resolution of 10C, to control the temperature of the problems.

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check lengths

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accelerometers

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forces

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pressures

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force tests

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climate tests

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shock and vibration tests