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wheel profile measurement

Requirements of wheel profile measurement

Wheels - probably one of the most important units of all rail vehicles, are exposed to high mechanical stress and therefore have a decisive influence on the running behavior and driving comfort of individual vehicle types. The wheel-rail system, which is subject to extensive demands in service, needs regular inspection to ensure operational reliability. Friction-related mechanical wear on wheel sets is also a cost factor that must not be ignored. Therefore inspection measurements, which at the moment are still done largely by manual methods, must be made at regular intervals. Manual methods are very subjective and reading errors cannot be ruled out. Based on these criteria the OPTIMESS mobile laser-based wheel profile measuring system offers essential advantages for measuring profiles on stationary wheels.



Mobile wheel profile measuring instrument

The OPTIMESS compact laser-based measuring instrument ensures that the profile data of wheels are selected and measured reliably. The measuring system is battery-operated with a data logger as an input and memory medium. The assignment of the nominal and maximum dimensions for the respective profile type and its monitoring is fully database-supported. Measurements on the wheel and assessment of wear can be performed quickly and easily.

Cost factor wheel profile wear

Long term analysis of the wear dimensions and profile inspections offer assistance in determining low-wear profiles. Optimum operating life of the vehicles (before re-profiling) can be determined based on wear behavior.

Measuring principle and system concept

The profile geometry is scanned by a non-contact, battery powered laser system. The contour data of the wheel profile is immediately available for operator review in the depot or workshop. Further evaluations are possible within the PC software after download from the handheld logger.



Run-out measurement and fiat area detection (optio

Wheel run-out can also be measured when used in conjunction with a mobile wheel set turning device of the Windhoff RSD type. The lifting device allows the axle to be raised and turned whilst in-situ. The OPTIMESS laser wheel profile measuring system can be attached to the axle rotating device by means of a special bracket. The run-out deviation is determined and logged by continuous laser measurement in the rotational plane during a revolution of the wheel. The continuous recording of the measurement also enables detection of flat-spot areas.

Measurement of rail profiles (optional)

Adapting the mobile wheel profile measuring instrument to a track gauge bar allows measurement of rail profiles. The rail head profile can be evaluated with the "Rail Measurement" software option.

PC software

The database-supported software enables further evaluation of the profile data measured on the vehicle. At the same time it enables management of all vehicles and wheel sets. In addition to the basic standard parameters of the profile the complete profile curve is available in graphical form for further wear investigations. The measurement procedure can be displayed graphically with the run-out measurement option.

The following standard evaluations are possible:

wheel flange height, thickness and qR dimensions

wheel width

track gauge calculation

wear history

limit comparison

nominal and actual profile comparison

profile co-ordinates of the measurement



The following options are also available:

measurement of wheel diameter

monitoring of diameter differences of the wheels of the whole vehicle, the drives and bogies

interfaces for data transfer with central EDP systems

hollow run