[PDF] Develompment of software that can predict damper curves on shock absorbers

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Abstract:

This thesis features the development of a software program with a plot function (a setting bank) for data curves, obtained when car dampers are tested in a dynamometer, which measures forces at given velocities. Advanced dampers havemany different adjusting possibilities and it was desired to collect data about this for a  number of damper types, in a software program that can be used to predict damper curves without having to perform actual tests. The goal was to make it easier for customers (mostly consisting of competitions teams) to test and evaluate different settings to a chosen damper in a fast and simple way, without having to use expensive testing equipment that also is a big time consumer. The project was performed at Öhlins USA Inc. in Hendersonville, North Carolina.

It is a subsidiary to Öhlins Racing AB, that manufactures performance shock absorbers for cars, motorcycles, snowmobiles and ATVs for both competition and commercial use. The project was initiated by evaluating and deciding different measuring methods, to see what equipment would be used and how the data collection would be performed. A literature study was also performed to get a better understanding about dampers and their functioning and anatomy. Work began by collecting empirical data at different velocities for a number of different settings, with a dynamometer. Because of the number of possible settings and the time elapse when collecting data, all settings were not actually collected. Most of them were instead calculated mathematically from the collected data.

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