Soil Compactor Roller Phase Control for Noise Reduction
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Solution Overview
Problem
Existing soil compactors experience excessive operating noise when compactor rollers are excited to oscillate, which is not effectively addressed without impairing compaction operations.
Innovation Solution
A soil compactor with at least two oscillating rollers, each equipped with a vibration excitation and detection arrangement, where the control system adjusts the phase offset of the oscillations to counteract noise caused by superposition, using flywheel drives and hydraulic motors to manage the oscillations, allowing the rollers to operate at optimal frequencies without phase shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the oscillation frequencies of the two compactor rollers are adjusted to differ from one another to avoid beats, then the occurrence of beats is reduced, but excessive operating noise occurs due to superposition of vibrations
Solution Approach 1:
The patent employs a control arrangement that receives vibration signals from both compactor rollers, analyzes their superposition effects, and dynamically adjusts the oscillation frequencies to maintain optimal phase relationships. This feedback mechanism allows the system to avoid beats while minimizing noise by preventing constructive interference of vibrations.
Solution Approach 2:
The control arrangement dynamically modifies the oscillation parameters (frequencies and phase offsets) of the compactor rollers based on real-time vibration analysis. By continuously adjusting these parameters, the system avoids fixed frequency differences that cause beats while preventing frequency combinations that generate excessive noise through superposition.
2Object-generated harmful factors
If the oscillation frequencies are kept the same to minimize noise, then operating noise is reduced, but beats occur due to superposition of oscillatory movements
Solution Approach 1:
The system transitions from static frequency settings to dynamic frequency control. The control arrangement continuously monitors vibration superposition effects and adjusts the oscillation frequencies in real-time, allowing the frequencies to vary within optimal ranges to prevent both beats and excessive noise depending on operating conditions.
Solution Approach 2:
By implementing feedback control that monitors the superposition of oscillatory movements, the system can detect early signs of beat formation and adjust frequencies proactively. This allows maintaining near-equal frequencies for noise reduction while having the capability to introduce small frequency differences when beats are detected.
3Object-generated harmful factors
If phase offset control is implemented to counteract vibration superposition, then noise is reduced, but the control system complexity increases
Solution Approach 1:
The control arrangement performs multiple functions: it monitors vibration levels, analyzes superposition effects, determines optimal phase offsets, and adjusts oscillation frequencies. By consolidating these functions into a single control system, the patent manages complexity while achieving effective noise reduction through phase control.
Solution Approach 2:
The control system automatically adjusts phase offsets and frequencies based on real-time vibration analysis without requiring external intervention. The system self-regulates to minimize noise from vibration superposition, reducing the need for complex external control mechanisms or manual adjustment systems.
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 solution effectively reduces noise and oscillations by actively managing the phase offset of the oscillating rollers, ensuring efficient compaction operations without altering their oscillation frequencies, thus minimizing operational noise and maintaining compaction efficiency.
Implementation Method 1
a vibration excitation arrangement for generating an oscillation movement of the oscillation compactor roller
Implementation Method 2
a vibration detection arrangement for providing the oscillation movement of a respective oscillation compactor roller representing vibration quantity
Implementation Method 3
the control arrangement is designed to control at least one vibration excitation arrangement based on the vibration quantities provided in association with the vibration compactor rollers such that the vibration movements of the vibration compactor rollers have a predetermined phase offset from one another
Implementation Method 4
vibration excitations caused by superimposition of the vibration movements of the vibration compactor rollers
Data Source
Figure 1
Figure 2a~2b
Figure 3~4
AI summary
A soil compactor comprises: - at least two vibrating compactor rollers (14, 16) rotatable about a respective roller rotation axis, - associated with each vibrating compactor roller (14, 16), a vibration excitation arrangement (22, 24) for generating a vibration movement of the vibrating compactor roller (14, 16), - associated with each vibrating compactor roller (14, 16), a vibration detection arrangement (38, 46) for providing a vibration quantity representing the vibration movement of a respective vibrating compactor roller (14, 16), - a control arrangement (36, 56) for controlling at least one vibration excitation arrangement (22, 24) based on the vibration quantities provided associated with the vibrating compactor rollers (14, 16) such that the vibration movements of the vibrating compactor rollers (14, 16) exhibit predetermined phase shifts relative to each other. In addition, there is also a method for operating a soil compactor (12).