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1. (WO2018200700) SYSTEM FOR DAMPING MASS-INDUCED VIBRATION IN MACHINES HAVING HYDRAULICALLY CONTROLLED BOOMS OR ELONGATE MEMBERS

Pub. No.:    WO/2018/200700    International Application No.:    PCT/US2018/029401
Publication Date: Fri Nov 02 00:59:59 CET 2018 International Filing Date: Thu Apr 26 01:59:59 CEST 2018
IPC: F15B 21/00
F15B 21/08
Applicants: EATON INTELLIGENT POWER LIMITED
YUAN, QingHui
Inventors: YUAN, QingHui
Title: SYSTEM FOR DAMPING MASS-INDUCED VIBRATION IN MACHINES HAVING HYDRAULICALLY CONTROLLED BOOMS OR ELONGATE MEMBERS
Abstract:
A system for damping mass-induced vibrations in a machine having a long boom or elongate member, the movement of which causes mass-induced vibration in such boom or elongate member. The system comprises multiple pressure sensors operable to measure pressure fluctuations in the hydraulic fluid pressures in the non-load holding and load holding chambers of a hydraulic actuator connected to the boom or elongate member that result from mass-induced vibration, and a processing unit operable to control a first control valve spool in a pressure control mode and a second control valve spool in a flow control mode in order to adjust hydraulic fluid flow to the actuator's load holding chamber to dampen the mass-induced vibration. The system further comprises a control manifold fluidically interposed between the actuator and control valve spools that causes the first and second control valve spools to operate, respectively, in pressure and flow control modes.