A smart way of measuring wheel-rail forces
Instrumented wheelsets are railway wheelsets that have been instrumented and calibrated for accurately measuring the dynamic contact forces between the wheel and the rail. In the USA, Europa, China and Japan, standards for vehicles acceptance testing such as EN 14363 required instrumented wheelsets as part of the approval process for new or significantly modified vehicles. The world’s first instrumented wheelsets were produced in Sweden in the 1950’s and IWT4 can trace its heritage back to these roots.
IWT4 utilises the client’s (Vehicle manufacturers are typical clients) original wheelsets fitted to the vehicle, without any structural modification to the wheelset. No special ‘test wheels’ are required. This simplifies project logistics, reduces the delivery time, and lowers the cost of the total measurement system. Only one side of the wheel needs to be instrumented. This simplifies the instrumentation process and enables the system to be adapted to fit challenging bogie designs
An advanced telemetry system removes the need for slip ring devices. This decreases costs, increases reliability, and simplifies installation of the system. No destructive machining of the wheelset is required, so the structural integrity of the wheelset is preserved. This reduces risk and removes the need for additional periodic ultrasonic inspections. Power is delivered to the system using an inductive transmission system, so as long as the vehicle is powered up, so are the IWT4s
The IWT4 technology has been used by clients around the globe since 2007. With over 60 wheelsets produced to date, while it is a ground-breaking product, it’s also robust and field hardened.