Invention Publication
- Patent Title: METHOD FOR REDUCING DYNAMIC LOADS OF CRANES
- Patent Title (中): 一种用于减少起重机系统负荷
-
Application No.: EP11759768.2Application Date: 2011-03-17
-
Publication No.: EP2550226A1Publication Date: 2013-01-30
- Inventor: KYLLINGSTAD, Åge
- Applicant: National Oilwell Norway AS
- Applicant Address: Postboks 8181 4069 Stavanger NO
- Assignee: National Oilwell Norway AS
- Current Assignee: National Oilwell Norway AS
- Current Assignee Address: Postboks 8181 4069 Stavanger NO
- Agency: Håmsø Patentbyrå ANS
- Priority: NO20100435 20100324
- International Announcement: WO2011119037 20110929
- Main IPC: B66C13/02
- IPC: B66C13/02 ; B66C13/06 ; B66C15/00
Abstract:
A method for reducing resonant vibrations and dynamic loads of cranes, whose horizontal and vertical motion of the pay load are controlled by a boom winch controlling the luffing motion of a pivoting boom and a hoist winch controlling the vertical distance between a boom tip and the load. Where the method includes determining the resonance frequencies of the coupled crane boom and load system, either experimentally or theoretically at least from data on inertia of the boom and stiffness of at least a boom rope, a hoist rope, a pedestal and an A-frame. The method further includes automatically generating a damping motion in at least one of said winches, that counteracts dynamic oscillations in the crane, and adding this damping motion to the motion determined by a crane operator.
Public/Granted literature
- EP2550226B1 METHOD FOR REDUCING DYNAMIC LOADS OF CRANES Public/Granted day:2016-06-15
Information query