AS 2377:2002 pdf – Acoustics—Methods for the measurement of railbound vehicle noise

AS 2377:2002 pdf – Acoustics—Methods for the measurement of railbound vehicle noise.
9 OPERATING CONDITIONS FOR THE RAILBOIJND VEHICLE DURING THE TEST
9.1 Type tests and monitoring tests
The following conditions shall apply during the test:
(a) For type tests, the wheel treads shall be smooth and free froni wheel flats.
(b) If a single railhound vehicle is to he tested, appropriate steps shall be taken to ensure that only the sound produced by the single railbound vehicle is measured.
(c) For power units, all operating conditions of the engine during the test shall be in accordance with the manufacturer’s specifications.
NOTE: For example. the lubricating oil, timing of fuel injection pump. temperature of lubricating oil and coolant liquid should be in accordance with the manufacturer’s specifications.
9.1.2 Loading of the vehicle
The vehicle shall be unladen or unoccupied except for the crew, where applicable. The mass of power units, e.g. locomotives, shall be as close as possible to the mass under normal working conditions. The loading conditions of the railbound vehicle shall he rcporwd.
9.1.3 floors, windows and auxiliary equipment
During measUrements, doors and windows of the vehicle shall be kept closed. All auxiliary equipment of the test vehicle that can operate during the run, except warning horns, hells or sirens, shall he in operation at the maximum normal load. The operating conditions of all auxiliary equipment shall be described and stated in the report.
9.1.4.1 constant speed lest
The moving vehicle tests shall he carried out at constant speed. Where not otherwise nominated, the speeds shown in Table 3 should be used.
(c) High speed acceleration test The vehicle shall approach the test site at half the speed employed in the constant speed test (see Clause 9.1.4.1) and then the engine power shall be increased tip to the maximum controller setting so as to achieve that setting about 100 m before the point of closest approach to the microphone. The increase in measured noise compared with that measured during the constant speed test is an indication of the extra noise output of the engine and drive train.
9.1.4.3 Braking tests
Braking tests are as follows:
(a) Friction brake test Friction brake element shall be bedded in prior to initiating brake test. The railbound vehicle shall approach the test site at 60 km/h and apply a full service brake application at the appropriate distance before the point of closest approach to the microphone as specified in Table 4. Other brake tests may be no ml n ated.
(b) Combined friction and dynamic/regenerative brake test Where the railbound vehicl is equipped with dynamic or regenerative braking capability, the maximum dynamic/regenerative setting shall be applied. The distances at which tke measurement is initiated shall be as shown in Table 4.