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- Title
A semi-physical model for pneumatic control valves.
- Authors
Fang, Lei; Tang, Li; Wang, Jiandong; Shang, Qunli
- Abstract
Pneumatic control valves in practice are usually composed of three signal conversion processes that are associated with significant nonlinearities and dynamics. However, several physical, semi-physical, and data-driven models in the literature describe only one signal conversion process from the actuator force to the valve stem position. In this paper, a semi-physical model is proposed based on the physical principles of the three signal conversion processes. The proposed model contains two new components, namely, a backlash nonlinearity in the electric-pneumatic conversion process and an input-direction-dependent dynamics in the pneumatic-force conversion process. In addition, an updated model for the force-position conversion process is shown to be overdamped, instead of being the underdamped one in the literature. Experimental studies are provided to support the proposed semi-physical model and demonstrate the discrepancies of representatives of existing physical, semi-physical and data-driven models with experimental observations.
- Subjects
PNEUMATIC control valves; FLUIDIC devices; DYNAMICS; DATA-based decision making in education; PNEUMATICS
- Publication
Nonlinear Dynamics, 2016, Vol 85, Issue 3, p1735
- ISSN
0924-090X
- Publication type
Article
- DOI
10.1007/s11071-016-2790-5