37.104

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The standard 37.104 relates to the field of testing, measuring and operating railcar wheel sets and profiles, and details fundamental requirements that ensure measurement accuracy whilst in operation. This article covers the field of application, main components and working principle of 37.104.

Field of Application

The standards of 37.104 is mainly applicable to testing, measuring and operating railcar wheel sets and profiles. This includes, but is not limited to, evaluating wheel radial run-out and profile parameters on both axles and wheels for compliance to manufacturer specifications, as well as other measurements such as plyometric air gap reduction tests. In addition, this standard is also applicable to the measurement and assessment of railcar wheels and axles with in-built sensors and other technologies for the purpose of enhancing system accuracy and reliability.

Main Components

37.104 has three main components: the measuring unit (MU), the control unit (CU) and the data acquisition system (DAS). The measuring unit forms the physical interface between the test sample (railcar wheel) and the test system while the control unit regulates the transfer of data from the measuring unit to the data acquisition system. Finally, the data acquisition system collates and stores the data collected from the measuring unit for further analysis and evaluation.

Working Principle

The test system operates according to a defined sequence of operations to ensure accurate and reliable results. Firstly, the railcar wheel and axle are placed on the measuring unit. This typically involves a hydraulic actuation mechanism to ensure that the wheel is firmly held in place on the measuring unit for accurate measurement. The measurement itself is performed by a wheel profile measuring device fitted to the measuring unit which passes line lasers over the wheel profile and acquires data. Afterwards, the acquired data is transferred from the measuring unit to the control unit then on to the data acquisition system which analyses and stores the data for further analysis.

Once the measurement is complete, the wheelset is removed from the measuring unit and the test result is evaluated. Pass or fail criteria is based on a series of predefined conditions and the test results are presented in either a visual or numerical format.

In summary, the main purpose of 37.104 is to provide a set of standard requirements and procedures for testing and measuring railcar wheel profiles and axles, ensuring accuracy and reliability for the results obtained.

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