Hydraulic Boom Vibration Damping With Sensor-Guided Valve Control

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Solution Overview

Problem

Current hydraulic systems for machines with long booms or elongate members are ineffective in damping mass-induced vibrations, as they often require mechanical compliance and do not adequately address these issues.

Innovation Solution

A system comprising control valve spools, motion sensors, and a processing unit that controls the flow of hydraulic fluid to the load holding chamber of a hydraulic actuator, allowing for independent pressure and flow control modes, thereby damping mass-induced vibrations without mechanical compliance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If conventional hydraulic systems are used to control long booms, then the system can move the boom, but mass-induced vibrations occur and are not effectively damped

Engineering Contradiction:

Improvemass-induced vibrationVSAvoidvibration damping effectiveness

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The system uses motion sensors to detect boom movement and feeds this information back to the control system, which then adjusts hydraulic fluid flow in real-time to counteract detected vibrations through active control algorithms

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent replaces passive mechanical compliance elements with an active electronic control system that uses sensors, processors, and electronically controlled hydraulic valves to achieve vibration damping without requiring mechanical flexibility in the boom structure

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Object-affected harmful factors

If mechanical compliance is added to damp vibrations, then vibration damping improves, but the system complexity and mechanical requirements increase

Engineering Contradiction:

Improvemass-induced vibrationVSAvoidmechanical compliance requirements

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The invention substitutes mechanical compliance elements with an electronically controlled hydraulic system that uses sensors and active control algorithms to achieve vibration damping, thereby eliminating the need for complex mechanical compliance mechanisms

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The system uses hydraulics with electronically controlled valves to provide active vibration damping, replacing the need for mechanical compliance by using fluid pressure control responsive to sensor feedback

Inventive Principle:

Principle #29Pneumatics and hydraulics

3Device complexity

If a single control valve is used, then the system is simpler, but independent pressure and flow control is not achieved

Engineering Contradiction:

Improvecontrol valve configurationVSAvoidpressure and flow control independence

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The control system is divided into separate functional components: one valve dedicated to pressure control and another dedicated to flow control, allowing each valve to optimize its specific function independently

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different parts of the hydraulic system receive different types of control - one branch receives pressure-regulated fluid while another receives flow-regulated fluid, with each control mode optimized for its specific purpose

Inventive Principle:

Principle #3Local quality

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Effectively reduces mass-induced vibrations in machines by controlling the flow of hydraulic fluid based on measured movement, enhancing stability and reducing unwanted oscillations.

Implementation Method 1

at least one motion sensor is operable to measure the movement of a boom or elongate member corresponding to mass-induced vibration

Methodology Applied

Scientific EffectVibration measurement: Vibration

Implementation Method 2

a processing unit to control the flow of hydraulic fluid to the load holding chamber of a hydraulic actuator to damp mass-induced vibration

Methodology Applied

Scientific EffectHydraulic fluid flow control: Hydraulic Press

Implementation Method 3

a first control valve spool being operable in a pressure control mode and a second control valve spool being operable in a flow control mode

Methodology Applied

Scientific EffectPressure control: Valve

Data Source

PatentUS11536298B2System with motion sensors for damping mass-induced vibration in machines

Publication Date: 2022.12.27 DANFOSS AS

AI summary

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 at least one motion sensor operable to measure movement of such boom or elongate member resulting 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 the hydraulic fluid flow to the load holding chamber of an actuator attached to the boom or elongate member 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.