Vibratory Compaction Machine Coordinated Drum Impacts

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Solution Overview

Problem

Current vibratory compaction machines lack coordination between front and rear drums, leading to inefficient impact delivery and uneven compaction, requiring more passes to achieve desired density and potentially causing durability issues due to uncontrolled vibrations.

Innovation Solution

A vibratory compaction machine with a vibration controller that coordinates the impact patterns of first and second drums by adjusting their vibration speeds and phases, ensuring the impact positions of the second pattern are offset and interleaved with respect to the first pattern, thereby improving compaction efficiency and reducing chassis vibrations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If independent vibration mechanisms are used in first and second drums, then compaction coverage is increased, but impact coordination is poor leading to uneven compaction

Engineering Contradiction:

Improvecompaction coverageVSAvoidcompaction uniformity

Core Design Contradiction:

Area of stationary objectVSManufacturing precision

Solution Approach 1:

The vibration controller receives feedback about the operational state of both vibration mechanisms and adjusts their respective phases and frequencies dynamically to achieve coordinated impact patterns, ensuring uniform compaction across the work surface while maintaining increased compaction coverage

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system dynamically adjusts the phase and frequency of each vibration mechanism based on real-time conditions, allowing the impact patterns to be coordinated adaptively. This dynamic control enables the drums to maintain optimal compaction uniformity across varying operational conditions while covering larger areas

Inventive Principle:

Principle #15Dynamics

2Manufacturing precision

If multiple passes are made to achieve desired density, then compaction uniformity is improved, but productivity decreases

Engineering Contradiction:

Improvecompaction uniformityVSAvoidcompaction efficiency

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The coordinated impact pattern ensures that every pass of the compaction machine delivers effective, non-redundant compaction energy to the work surface. By eliminating gaps and overlaps in the impact pattern, the system achieves desired compaction uniformity in fewer continuous passes, thereby maintaining high productivity

Inventive Principle:

Principle #20Continuity of useful action

3Reliability

If uncontrolled vibrations are transmitted through chassis, then structure durability may be compromised, but vibration isolation increases complexity

Engineering Contradiction:

Improvechassis durabilityVSAvoidvibration control system

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The system converts potentially harmful uncoordinated vibrations into beneficial coordinated compaction forces. By controlling the phase relationship between the two vibration mechanisms, the impacts are synchronized to produce constructive interference at the work surface while minimizing destructive vibrations transmitted to the chassis, thus protecting durability without adding complex isolation systems

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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

The coordinated impact patterns allow for more efficient compaction, reducing the number of passes needed to achieve uniform asphalt density and minimizing vibrations transmitted through the chassis, enhancing the overall performance and durability of the compaction machine.

Implementation Method 1

A compaction machine may include eccentric masses (also referred to as eccentric shafts) in the respective drums that are rotated at speed to generate vibrations that are transmitted as impacts by the drums to the work surface

Methodology Applied

Scientific EffectEccentric rotation: Eccentric

Implementation Method 2

eccentric masses (also referred to as eccentric shafts) in the respective drums that are rotated at speed to generate vibrations

Methodology Applied

Scientific EffectVibration: Vibration

Implementation Method 3

The vibration controller is configured to control at least one of a vibration speed and a phase of at least one of the first and second vibration mechanisms so that the first pattern of impacts and the second pattern of impacts are coordinated

Methodology Applied

Scientific EffectPhase control:

Data Source

PatentEP3610070B1Vibratory compaction machines providing coordinated impacts from first and second drums and related method

Publication Date: 2024.10.23 VOLVO CONSTRUCTION EQUIPMENT AB

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AI summary

A compaction machine may include a chassis, first and second drums rotatably mounted to the chassis, first and second vibration mechanisms, and a vibration controller. The first vibration mechanism may be configured to generate vibrations that are transmitted as impacts by the first drum to a work surface, and the second vibration mechanism may be configured to generate vibrations that are transmitted as impacts by the second drum to the work surface. The vibration controller may be configured to control at least one of the first and second vibration mechanisms so that a first pattern of impacts transmitted to the work surface by the first drum and a second pattern of impacts transmitted to the work surface by the second drum are coordinated as the compaction machine moves over the work surface. Related controllers and methods are also discussed.