AUTOMOTIVE DESIGN
an overall system understanding, and good electrical engineering skills, are mandatory. Based on the conducted simulations and measurements changes in the mechanical design or sometimes even in the control of, for example an e-motor, can be necessary to optimise the overall NVH performance. Hence, modern mechatronics systems need different points of view to holistically solve challenges in the development phase of a new product.
EMBRACE INNOVATION A best practice example of the mixture of different technologies and engineering domains can be found in the latest generation of NVH e-axle test cells. One of these test-cells can be found at the Research
Institute for Automotive Engineering and Powertrain Systems Stuttgart (FKFS). Together with the FKFS, Tectos
designed, installed, and validated a single-axle NVH powertrain test bench. This bench can operate powertrains which are powered by electric motors, hybrid drivetrains and ICEs. The cell, which has a lower limit frequency of 125Hz, is equipped with the necessary fuel supply and an exhaust gas extraction system. The drivetrain was especially designed for this application using a self-supporting shaft assembly in
a fully anechoic cell. This concept minimises possible transmission of structure-borne noise between the dynamometers, which are mounted outside of the test cell, and the unit under test (UuT). The whole test-cell drivetrain is
decoupled from the base structure to ensure an ideal structural dynamics behaviour during operation. Besides realising these mechanical engineering related properties, the test cell was equipped with a fully variable network, an automation system and an in-house developed condition- monitoring system for the complex drivetrain. Furthermore, a safety concept was implemented which allows instructed
operators to enter the test cell at low speeds and torques and thus get an individual noise impression of the UuT. This concept enables the users to investigate modern powertrain topologies at the highest technical level combined with economically competitive conditions. The figures show the schematics of the test- cell layout and one side the NVH drivetrain. This example outlines the need of
new technologies and highly skilled engineers to successfully build such testing facilities. This project was only possible because Tectos experts from different domains closely worked together using the latest design methodologies and tools. This includes mechanical, mechatronics and electrical engineers with a strong background in NVH engineering. Although all engineers have their
own field of expertise, a broad understanding of the whole test cell is required during all project phases. Moreover, a deep understanding of the powertrains which should be optimised is crucial. Engineers at Tectos are ready to meet the increasing demand for NVH technology, services, and testing, providing high class solutions to challenges in this area of expertise. ●
Integration of operational vibration monitoring into the test bench environment
Dr Stefan Maxl, Business Unit Leader Engineering, and Dr Dieter Höfler, CEO, are with tectos GmbH.
www.tectos.at
www.engineerlive.com 17
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52
