Work Machine Speed Measurement via Acceleration Change-Point Detection
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Solution Overview
Problem
Existing methods for measuring the maximum running speed of work machines, such as hydraulic excavators, suffer from significant errors due to manual measurement inaccuracies and environmental dependencies of sensors like GPS, and existing acceleration-based methods fail to accurately identify the transition from acceleration to steady speed.
Innovation Solution
A speed measuring device using an acceleration sensor to detect the transition from an accelerating state to a steady running state, employing a Kalman filter to integrate and correct acceleration data, thereby precisely identifying the maximum running speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a laser beam is used to measure the speed of a baseball, then the measurement precision is improved, but the device complexity increases due to requiring precise positioning mechanisms
Solution Approach 1:
The patent uses optical imaging to create a two-dimensional image of the baseball on an imaging device. This optical copy allows speed calculation through image processing rather than direct physical measurement, eliminating the need for complex positioning mechanisms while maintaining measurement precision.
Solution Approach 2:
The patent replaces mechanical positioning systems with an optical imaging system. Instead of mechanically tracking the baseball's position, the system captures optical images and processes them computationally to determine speed, significantly reducing mechanical complexity.
2Reliability
If multiple cameras are used to track the baseball, then the measurement reliability is improved, but the device complexity and cost increase
Solution Approach 1:
The patent uses a single imaging device that performs multiple functions: capturing the baseball's position, determining its orientation through asymmetry analysis, and calculating speed. This multi-functional approach achieves reliable measurements without the complexity of multiple specialized cameras.
Solution Approach 2:
The imaging device creates a two-dimensional optical copy of the three-dimensional baseball, allowing all measurement information (position, orientation, speed) to be extracted from this single image copy, eliminating the need for multiple physical cameras.
3Measurement precision
If the imaging device is placed close to the release point, then the measurement precision is improved, but the area required for device installation increases
Solution Approach 1:
The patent positions the imaging device in a specific spatial dimension (above and behind the release point) to capture the baseball's motion in two dimensions. This dimensional positioning allows precise speed measurement from a compact installation area, as the imaging geometry naturally provides the necessary measurement baseline.
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 device accurately determines the maximum running speed without environmental dependencies, reducing measurement errors and eliminating the need for excessive time margins, allowing for precise and efficient performance assessment.
Implementation Method 1
a laser beam is used to measure the speed of a baseball
Implementation Method 2
an imaging device is used to obtain a two-dimensional image of the baseball
Data Source
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AI summary
The purpose of the present invention is to provide a speed measurement device with which it is possible to accurately identify the highest travel speed of a work machine using the result of measurement by an acceleration sensor. The speed measurement device according to the present invention: detects, from within a record of the travel acceleration of a work machine, a change point at which the work machine transitions from an accelerating state to a steady travel state; and identifies the highest travel speed from a record of the travel speed in a period later than the change point.