Motor Grader Bounce Control via Speed Adjustment
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Solution Overview
Problem
Motor graders experience harmonic vibrations or 'bounce' due to resonance at their natural frequency, leading to uneven finishes and operational interruptions, which existing systems fail to effectively mitigate.
Innovation Solution
A control system equipped with sensors to measure bounce and speed, a controller that determines the maximum amplitude of bounce and generates command signals to adjust the motor grader's speed, thereby reducing or eliminating harmonic vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the motor grader operates at speeds within a particular range, then productivity is improved, but harmonic vibrations or bounce occur due to resonance at natural frequency
Solution Approach 1:
The control system continuously monitors bounce conditions through sensors and automatically adjusts machine speed in real-time based on detected vibrations. This closed-loop feedback mechanism detects when the motor grader enters a resonant frequency range and responds by modifying operational parameters to eliminate bounce, thereby maintaining productivity while preventing harmful vibrations.
Solution Approach 2:
The system dynamically changes the operational speed parameter of the motor grader to move away from resonant frequencies that cause bounce. By adjusting speed as a controllable parameter, the system avoids the particular speed ranges that trigger harmonic vibrations while maintaining efficient grading operations.
2Object-affected harmful factors
If bounce detection and speed adjustment systems are implemented, then harmonic vibrations are reduced, but device complexity increases
Solution Approach 1:
The system replaces manual operator intervention with automated electronic control. Sensors, processors, and actuators form an electronic control loop that automatically detects bounce conditions and adjusts speed without requiring operator awareness or manual adjustment, thereby reducing the complexity of human-machine interaction while effectively controlling vibrations.
3Manufacturing precision
If automated speed control is implemented to reduce bounce, then manufacturing precision is improved, but loss of time occurs due to speed adjustments
Solution Approach 1:
The control system operates continuously to maintain optimal grading conditions. By constantly monitoring bounce and making real-time speed adjustments, the system prevents interruptions in the grading process that would otherwise occur due to severe bounce conditions. The continuous automated control ensures uninterrupted useful action while maintaining finish 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
The system effectively reduces or eliminates harmonic vibrations, improving the finish quality and operational stability of motor graders by automatically adjusting speed based on measured bounce amplitudes.
Implementation Method 1
Certain machines such as motor graders have a natural frequency that may negatively affect their operation due to resonance at such natural frequency. The natural frequency of a motor grader is a function of numerous physical characteristics of the machine... Excitation at the natural frequency may result in harmonic vibrations within the motor grader commonly referred to as 'bounce.'
Data Source
AI summary
A system for automated control of a motor grader includes a first sensor to indicate bounce of the motor grader and a speed sensor to indicate the ground speed. A controller determines a maximum amplitude of the bounce of the motor grader and controls the ground speed of the motor grader at least in part based upon the maximum amplitude of the bounce. A method is also provided.