Circuits for cyclic load-sequences can be designed on the basis of different
concepts. In general the type or class of cyclic loads will play an important role in
the design of such circuits. The design is usually not only based on a number of
trivial demands on flow- and pressure-sequences, but also based on demands on
efficiency of the system. Optimal circuits can be designed for a certain loadsequence
if this load-sequence is known or can be measured. In a number of cases
it is desired that the hydraulic circuit can adapt to different cyclic loads without
deterioration of efficiency.
In this paper the design of two different concepts for cyclic load-sequences is
investigated. One of the concepts is based on a variable displacement pump system.
The second concept is based on an adaptable fixed displacement pump-accumulator
system (Learning Hydraulic System or LHS for short). For such systems the type
or class of load-sequences has to be characterised or specified. As was shown in the
research for the LHS the characterization of the cyclic load-sequence can be
quantified by the mean power in combination with the standard deviation of the
power. In this research attention is paid to the determination of the useful
boundaries of the adaptable performance of the two concepts of the designs with
respect to the class of load-sequences.
Some interesting conclusions in respect of the mean efficiency and adaptable
performance can be drawn from the comparison of the two different concepts. This
study is based on theoretical research and partly on experimental research.
|Title of host publication||Design and performance : 8th Bath international fluid power workshop, held at the University of Bath, England, 20-22 September 1995|
|Editors||C.R. Burrows, K.A. Edge|
|Place of Publication||Taunton|
|Publisher||Research Studies Press|
|Number of pages||382|
|Publication status||Published - 1996|
|Name||Fluid power series|