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RENK Test System

RENK Test System



Your reliable partner for test rig solutions.

RENK Test System GmbH (RTS) is one of the world's leading  providers of customized test systems used in development, production, and quality assurance. Based on its many years of experience, RTS develops innovative test rigs for nearly every area of application in drive technology.

Due to the steadily increasing demands that are being placed on driving comfort, safety, and speed in the field of railway technology, the requirements placed on the development of future transport solutions are becoming more complex all the time. Railway transport is playing an increasingly important role based on the growing demand for environmentally friendly modes of transport. This calls for the use of cutting-edge test system technology and reliable partners.

Our expertise extends from targeted consultation, concept creation and validation, development, and production up to the commissioning of the systems at the customer's location, with subsequent training of the operating personnel. The entire product range is completed by needs-oriented service, and regular maintenance.




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16 July 2021


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RENK Test System GmbH: Mr Johannes Leopold, Mr Matthias Huttner, Mr. Jens Härlen, Mr. Michael Steglich


The new and further development of vehicle brake systems today mainly takes place on flywheel brake test rigs. In these test benches, the brake disc is accelerated to the desired test speed by means of an electric motor. The vehicle mass is simulated using rotating flywheel masses that are integrated in the drive train of the test rig and are thus mechanically coupled to the brake disc to be tested. Different vehicle masses are usually implemented with several inertia masses, which can be coupled and decoupled as required. An exact setting to the vehicle mass to be simulated can then be made via the drive motor, which acts as a generator/motor during the test run and thus can represent an additional positive or negative inertia. In principle, a very simple and realistic simulation of the vehicle masses can be achieved using the flywheels, but the structurally complex implementation of such a solution ultimately means a not inconsiderable cost item in the total price of such a test system. The great advances that have been made in recent years with high-torque motors and their control accuracy make it possible today to ask whether the standard centrifugal masses can be replaced by a mass inertia simulation of large motors. For this purpose, extensive investigations and calculations are currently being carried out at RENK Test System GmbH using the example of a full-scale flywheel brake test bench for brake systems in rail traffic. The results of this work will be presented with the proposed technical paper: Estimation of the limits and control accuracy of the electrical inertia simulation by testing it on the real test bench Examination of the essential assemblies (base frame, basic flywheel, floating bearing (test specimen holder), test station) with regard to the necessary function, design and costs Presentation of the advantages and disadvantages of the "classic flywheel brake test bench" compared to the "brake test bench with electrical mass simulation" We would expressly welcome a following discussion of the presented study results (also regarding the partly personal preferences of the operators).

EuroBrake 2022

Testing requirements and friction couples



Brake dyno with minimized flywheel mass - What can modern AC motors achieve?, EB2022-CSB-001, EuroBrake 2022




Mr. Armin Diller, RENK Test System, GERMANY

Mr. Jürgen Gaßner, RENK Test System, GERMANY

Test bench brake calliper with maximum power range

RENK Test System is one of the world´s leading providers of customized test systems used in development, production and quality assurance. Based on its many years of experience, RTS develops innovative test rigs for nearly every area of application in drive technology. A very interesting area are brake dynamometers for the development of rail friction brake systems.

When designing a brake test stand, it is advantageous if it is suitable for testing various brake systems from a wide variety of vehicle classes. For this reason, RENK has developed a special brake calliper for testing disc brake pads, which is superior to standard brake callipers in many areas:

- The interface of this test bench brake calliper allows the assembly of all relevant brake pads for railway disc brakes.

- The performance range of the test bench brake calliper covers the maximum requirements of all possible brake pads (highest vehicle mass - highest vehicle speed) and allows targeted overloads for special tests.

- Depending on the test requirements, this test bench brake calliper works with pneumatic brake force support.

- The direct force measurement necessary for the certification of the brake system test rig according to UIC 548, which has to be retrofitted at great expense for standard brake callipers for the test rig application, is already available and can even be supplemented by further sensors.

- Despite this versatility, the test bench brake calliper that has been developed is more wear-resistant than standard brake callipers.

A first brake calliper was successfully tested at RENK over a period of approx. 2 months this year and is to be handed over to a customer in 2021.

A second brake calliper will be subjected to further tests in the spring of 2021 in Augsburg.

The proposed lecture is intended to provide an overview of the development activities that have been carried out and are still planned:

- Why did RENK decide to develop a special brake calliper for test bench operation? What are the weak points when using a standard brake calliper?

- What development goals have been set for this test bench brake calliper? Which performance range should this development cover?

- What experiences have been gained so far from the practical use of the test bench brake calliper? Which optimization measures have already been carried out? How does it behave in contrast to standard brake callipers?

- What remaining work still needs to be done in the development of this special brake calliper?

EuroBrake 2021




Test Bench Brake Calliper with Maximum Power Range, EB2021-STP-018, EuroBrake 2021

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