Numerical Control Feed-Forward Silencing for Servo Motor Noise
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Solution Overview
Problem
Existing noise reduction methods for machine tools face delays in noise reduction effects due to feedback control, making it challenging to effectively cancel noise as it is generated or stopped.
Innovation Solution
A numerical controller and system that store and manage position and speed information along with opposite-phase sound data, allowing for feed-forward noise cancellation during servo control operations, reducing noise generation with minimal delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If feedback control is used to generate opposite-phase sound based on detected noise, then noise reduction effect is achieved, but delay occurs from noise generation to noise reduction effect
Solution Approach 1:
The system performs preliminary action by pre-generating opposite-phase sound data based on position and speed information before the actual noise occurs. The noise reduction control unit generates opposite-phase sound in advance during servo control operations, eliminating the delay inherent in feedback control methods that detect noise after it has already been generated.
Solution Approach 2:
The system applies beforehand cushioning by preparing opposite-phase sound data in advance and storing it in the noise reduction data storage unit. This pre-prepared opposite-phase sound acts as a cushion that immediately counteracts the noise when the predetermined conditions are met, preventing the time lag that occurs in traditional feedback control where noise must first be detected before counteraction begins.
2Object-affected harmful factors
If soundproof walls or sound proof covers are installed to reduce noise, then noise reduction is achieved, but cost and installation area increase
Solution Approach 1:
The system replaces the mechanical approach of soundproof walls and covers with an acoustic field-based solution. Instead of physically blocking noise propagation through mechanical barriers, the system generates opposite-phase sound waves that actively cancel the noise through acoustic interference, thereby eliminating the need for complex mechanical soundproofing structures.
Solution Approach 2:
The system introduces an intermediary element - the opposite-phase sound - that mediates between the noise source and the surrounding environment. Rather than directly blocking noise with physical barriers, the intermediary opposite-phase sound waves interact with the original noise waves to produce cancellation, providing a more elegant solution that avoids the complexity of mechanical soundproofing.
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 approach enables high noise reduction with little delay by using pre-stored opposite-phase sound data in conjunction with position and speed information, improving noise cancellation efficiency.
Implementation Method 1
output a sound in opposite phase to the noise in synchronization with the noise generation timing based on the detected timing and a residual sound detected by a microphone for detecting a residual sound, thereby reducing the noise by interference of sound waves
Data Source
AI summary
A numerical control device comprises: a control unit that servo-controls a motor; and a silencing data management unit that associates and stores in a storage unit information including at least one of position information and speed information of the motor, and sound data of sound in opposite phase to generated sound. When performing second servo control of the motor that operates according to at least one of position information that is the same as said position information and speed information that is the same as said speed information, the control unit outputs the at least one of the position information and the speed information to the silencing data management unit, and the silencing data management unit reads and outputs the sound data of the sound in opposite phase from the storage unit on the basis of the at least one of the position information and the speed information.