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Stabilitetsanalys av stötdämparventil
Linköping University, Department of Management and Engineering.
2007 (Swedish)Independent thesis Advanced level (degree of Magister), 20 points / 30 hpStudent thesis
Abstract [sv]

Sammanfattning

CES-ventilen (Continuously Controlled Suspension System) används inom bilindustrin för att kontinuerligt variera stötdämparens dämpningskoefficient, en teknik som benämns semiaktiv dämpning. CES-ventilen arbetar som en tryckregulator och reglerar dämpningen genom att styra tryckfallet över ventilen. Produkten utvecklas ständigt och för att kunna förutsäga ventilens påverkan på fordonet avseende dämparkarakteristik, vibrationer och ljud är det mycket viktigt att kunna beskriva ventilens dynamiska egenskaper.

Examensarbetet fokuserar därför på att kartlägga ventilens stabilitet och dynamik i olika arbetsmiljöer. I arbetet jämförs praktiska mätvärden från två testriggar med teoretiska beräkningar och simuleringsresultat. Modelleringsarbetet på delsystemnivå har gjorts i Matlab-Simulink och till viss del i Hopsan. En reglerteknisk linjär modell av CES-ventilen har även gjorts.

Analysen har resulterat i att en stor del av dynamiken, ventilbetingad och testriggsbetingad kan särskiljas och förklaras vid mätning i olika testriggar. En mätmetod för objektiv bestämning av ventilens stabilitet i hela arbetsområdet har dessutom utformats och dokumenterats.

Abstract [en]

Abstract

As the abbreviation implies, the CES-valve (Continuously Controlled Suspension System) continuously varies the damping coefficient of the shock absorber. The technique is called semi active damping and is extensively used within the car industry. The CES-valve works as

a pressure control valve and varies the damping by controlling the pressure difference over the valve. Continuous development is significant for the valve and in order to be able to predict the valve influence on the vehicle, it is critical to describe the dynamic characteristics of the valve in a proper way. From a vehicle point of view, damper properties, vibrations and sound are interesting aspects.

The thesis work focuses on analyzing stability and dynamic properties of the valve in various working environments. Practical measurement values from two different test stands are compared with theoretical calculations and simulation results. Modelling of system parts were mainly carried out in Matlab-Simulink but also in Hopsan to some extent. A control theory linear model of the valve has also been developed.

As a result of the thesis, a great deal of the valve- and test stand dependent dynamics from measurements in different test stands can now bee distinguished and explained. Additionally, an objective measurement method for valve stability in the entire valve range has been designed and documented.

Place, publisher, year, edition, pages
Institutionen för ekonomisk och industriell utveckling , 2007. , 85 p.
Keyword [sv]
Semiaktiv dämpning, stabilitet, tryckregulator
National Category
Reliability and Maintenance
Identifiers
URN: urn:nbn:se:liu:diva-8491ISRN: LIU-IEI-TEK-A--07/0033--SEOAI: oai:DiVA.org:liu-8491DiVA: diva2:23262
Presentation
2007-01-19, IKP1, A, 13:15
Uppsok
teknik
Supervisors
Examiners
Available from: 2007-03-07 Created: 2007-03-07

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CiteExportLink to record
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