Vibration Waveform Ramping for Linear Motor Startup Noise
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Solution Overview
Problem
Linear motors experience overdrive issues during startup and stop times when operating at non-resonant frequencies, resulting in unsteady vibration senses and high noise levels due to disordered amplitudes.
Innovation Solution
A processing method and apparatus for vibration waveforms that smoothly transition the amplitude of steady-state waveforms from zero to the amplitude of the linear motor's steady vibration state during startup and back to zero during stop times, using techniques such as superimposing cosine waveforms or processing with an ascent algorithm to ensure smooth amplitude changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a steady-state waveform is used to control the linear motor at non-resonant frequency, then the motor can operate efficiently, but overdrive problems occur during startup and stop times causing unsteady vibration and high noise
Solution Approach 1:
The patent applies preliminary action by pre-processing the steady-state waveform to add smooth transition segments at the beginning and end. Before the main vibration waveform starts, a ramp-up segment gradually increases amplitude from zero to the target level. After the main waveform ends, a ramp-down segment gradually decreases amplitude back to zero. This preliminary preparation of transition segments prevents sudden amplitude changes that cause overdrive problems during startup and stop times.
Solution Approach 2:
The patent changes the amplitude parameter dynamically during startup and stop phases. Instead of maintaining constant amplitude throughout, the system varies amplitude smoothly: starting from zero, increasing to the steady-state amplitude during the startup phase, maintaining it during operation, then decreasing back to zero during the stop phase. This parameter change approach eliminates abrupt transitions that cause overdrive and associated noise issues.
2Speed
If the amplitude changes abruptly during startup and stop, then the response time is fast, but the vibration sense becomes unsteady and noise increases
Solution Approach 1:
The patent applies dynamics by making the amplitude transition adaptive rather than fixed. During startup and stop phases, the system dynamically adjusts the amplitude according to a smooth transition function, creating a time-varying amplitude profile. This dynamic approach allows the vibration amplitude to evolve continuously from zero to steady-state and back, maintaining vibration steadiness while achieving responsive startup and stop behavior.
Solution Approach 2:
The patent uses periodic action in the form of smooth transition segments that follow a regular amplitude modulation pattern. The startup phase uses a periodic ramp-up function to gradually build amplitude, and the stop phase uses a periodic ramp-down function to gradually reduce amplitude. These periodic transitions ensure smooth amplitude changes that maintain vibration steadiness while providing fast overall response.
Data Source
Figure 1a~1b
Figure 2a
Figure 2b
AI summary
Embodiments of this application provide a processing method and apparatus for a vibration waveform, a device, and a readable storage medium. In the processing method for a vibration waveform, a vibration description file is obtained, and a waveform type described in the vibration description file is recognized; a startup time and a stop time are extracted from the vibration description file in a case that the waveform type described in the vibration description file is a steady-state waveform; and an amplitude of the steady-state waveform within the startup time is processed as being smoothly changed from zero to an amplitude of the linear motor in a steady vibration state, and an amplitude of the steady-state waveform within the stop time is processed as being smoothly changed from the amplitude of the linear motor in the steady vibration state to zero.