Remote Excavator Attachment Vibration Filtering for Contact Detection
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Solution Overview
Problem
Existing remote operation systems for construction machines struggle to accurately determine whether an attachment has come into contact with a work target, as they transmit all vibrations, including those from the machine body, to the operator, making it difficult to distinguish target contact vibrations.
Innovation Solution
A remote operation device that includes a vibration detector to identify the amplitude and frequency of vibrations in multiple directions, a communication system to transmit relevant vibrations to the operator, and a control section to selectively transmit only vibrations meeting specific amplitude and frequency criteria, indicating contact with a work target.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If all vibrations from the construction machine are transmitted to the remote operator, then the operator receives comprehensive vibration information, but the operator cannot distinguish between target contact vibrations and machine body vibrations
Solution Approach 1:
The patent segments the vibration signal into multiple frequency components using Fast Fourier Transform (FFT). By dividing the continuous vibration signal into discrete frequency bands, the system can analyze and identify specific frequency ranges that correspond to target contact vibrations versus machine body vibrations, enabling selective transmission of relevant vibration information.
Solution Approach 2:
The patent extracts only the vibration components that meet predetermined criteria (specific frequency ranges and amplitude thresholds) from the total vibration signal. The extraction unit isolates and transmits only those vibration components that indicate target contact, filtering out irrelevant machine body vibrations while preserving the essential target contact information.
2Measurement precision
If vibration filtering is applied to transmit only target contact vibrations, then the operator can accurately determine target contact, but the system complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the transmitted vibration information is continuously monitored and compared against predetermined thresholds. The system adjusts the transmission of vibration components based on real-time analysis, creating a closed-loop control system that automatically filters and transmits only relevant vibration signals without requiring complex manual intervention.
Solution Approach 2:
The patent changes the parameter representation of vibration signals from time-domain to frequency-domain using FFT transformation. By converting vibration signals into frequency spectra, the system can easily identify and filter specific frequency components associated with target contact, simplifying the overall signal processing architecture while improving detection accuracy.
3Loss of information
If multiple vibration components are transmitted to provide comprehensive information, then the operator has more data for decision making, but the communication bandwidth and data processing requirements increase
Solution Approach 1:
The patent extracts only the essential vibration components that meet predetermined criteria for target contact detection. By selecting and transmitting only the relevant frequency components and amplitude data, the system maintains high information quality for operator decision-making while significantly reducing the overall data transmission volume compared to transmitting all vibration components.
Solution Approach 2:
The patent applies different quality levels of vibration information transmission based on the specific vibration component. Critical frequency components indicating target contact are transmitted with high fidelity and detail, while non-critical components are either filtered out or transmitted with reduced detail, optimizing the balance between information quality and data transmission efficiency.
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
This solution allows for precise determination and selective transmission of vibrations indicating attachment contact, enhancing the operator's ability to accurately perform remote operations by filtering out non-target-related vibrations.
Implementation Method 1
a vibration detector (41) disposable on the construction machine and configured to detect a plurality of vibration components in a plurality of directions different from each other, the vibration components being included in a vibration caused on the attachment
Data Source
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AI summary
A remote operation device (101) includes: a vibration detector (41) configured to detect a plurality of vibration components in a plurality of directions different from each other, the vibration components being included in a vibration caused on an attachment (6); a transmission device (71, 72); and a transmission control section (54) that controls an operation of the transmission device (71, 72). A vibration determination condition is set in advance, the vibration determination condition including a condition that an amplitude of a maximum vibration component largest in amplitude among the plurality of vibration components detected by the vibration detector (41) is equal to or larger than a preset amplitude threshold. The transmission control section (54) controls the operation of the transmission device (71, 72) to allow the vibration information to be transmitted to an operator only when the vibration determination condition is met.