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Abstract: The electro-hydraulic proportion valve is used in the novel
hoist for well logging to regulate the angular speed of the roller. The
rolling radius is changing during well logging, and the line speed is
also changing continuously. In order to keep the line speed constant ,
the angular speed should be regulated manually which is a heavy work,
and also the output consistency is not satisfactory. Analyzing the
characteristic of the hoist, a kind of digital controller of constant
speed is designed using Dahlin arithmetic ,the model and formulas are
presented. The stability of line speed in the designed digital control
system keeps in good accord with the requirements of local well logging,
the workload is decreased also, and it is a good application with higher
quality and lower cost.
Key words:
Electro-hydaraulic proportion Hoist Digital control
Speed
CLC No: TH137.52
Received
20040712, received in revised form 20041128
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