Reducing flow pulsation with the floating cup pump: theoretical analysis
2004 (English)In: Bath Workshop on Power Transmission and Motion Control (PTMC 2004) / [ed] Burrows, CR; Edge, KA; Johnson, DN, 2004, 123-141 p.Conference paper (Other academic)
With the recent introduction of the floating cup (FC) displacement principle, axial piston units can be realised using low cost mass production techniques instead of the more machine shop type of production techniques used to date. As a consequence, a far larger number of displacement volumes can be realised at the same or lower unit costs. An obvious advantage of a larger number of pistons is the reduction of flow pulsation from the unit. This paper focuses on this flow pulsation. In the ideal theoretical case that two out of phase halves of an FC pump directly deliver to the pump outlet, the odd harmonics in the 12 piston based flows from each pump half, will cancel out totally. In reality however, both sides are connected by a duct of finite length. The geometry of that duct and the location of the pump outlet, can significantly influence both the 'external' flow pulsation - at the pump outlet - and the 'internal' flow pulsation - in the duct. The paper shows that if the outlet duct is arranged symmetrical with respect to the two pump halves, perfect cancellation of the odd harmonics is indeed reached but only at the cost of high resonant pressure peaks within the duct. These pressure peaks might cause pump noise. They can be attenuated by either arranging the outlet in a non-symmetrical position or by adding Helmholtz resonators to the duct. Both options were studied; both show potential.
Place, publisher, year, edition, pages
2004. 123-141 p.
IdentifiersURN: urn:nbn:se:kth:diva-74594ISI: 000223999600009ISBN: 1-86058-466-7OAI: oai:DiVA.org:kth-74594DiVA: diva2:489740
Bath Workshop on Power Transmission and Motion Control (PTMC 2004). Univ Bath, Bath, ENGLAND. SEP 01-03, 2004
QC 201202032012-02-032012-02-032012-02-03Bibliographically approved