Design Considerations for Improved Fluidic Input Servovalve Performance
Abstract
A study has been made to determine how the performance of two-stage fluidic input servovalves can be improved. The first stage of the servovalve consists of a fluidic amplifier that is coupled to set of input bellows, which in turn is coupled to a flapper nozzle valve, and the second stage consists of a sliding spool. At present, fluidic input servovalves have time constants of approximately 15 ms. This study is primarily concerned with determining the first-stage design changes needed to (1) obtain overall fluidic input servovalve time constants of 1 to 5 ms and (2) reduce leakage flow. Analysis of the first-stage flapper indicates that the servovalve time constant can be minimized by minimizing the area of the input bellows. The bellows area is the only first-stage servovalve parameter that can be changed to decrease the servovalve time constant without necessitating additional parameter changes. Moreover, minimizing the bellows area also reduces the leakage flow in the servovalve. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1979
- Accession Number
- ADA068977
Entities
People
- Francis M. Manion
- Richard Deadwyler
Organizations
- Harry Diamond Laboratories