Vehicle Pop-Up Speaker Nonlinear Motion for Noise and Vibration
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Solution Overview
Problem
Conventional pop-up speakers in vehicles generate noise and vibration due to large changes in operating moment during initial operation and stopping, which are not effectively addressed by existing technologies.
Innovation Solution
A pop-up speaker control apparatus and method that operates the pop-up speaker nonlinearly using a control curve with different characteristics based on time, specifically defined by Equations 1 and 2, to manage the moment changes and reduce noise and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the pop-up speaker operates linearly with position increasing or decreasing in proportion to time, then the control is simple, but large moment changes occur during initial operation and stopping causing noise and vibration
Solution Approach 1:
The patent applies dynamics by transitioning from linear motion control to nonlinear motion control. The control module changes the motion state of the pop-up speaker from uniform linear movement to accelerated movement with varying velocity. This dynamic control approach adjusts the position according to a nonlinear function where the rate of change is not constant, thereby reducing moment changes during operation and stopping while eliminating noise and vibration.
Solution Approach 2:
The patent implements parameter changes by modifying the control parameters of the pop-up speaker's motion. Instead of using constant velocity linear control, the system employs time-varying control parameters where position is determined by a nonlinear function of time. This parameter transformation from linear to nonlinear control resolves the contradiction by reducing harmful moment changes without significantly increasing control complexity.
2Speed
If a large moment is applied to initially operate the pop-up speaker from stationary state, then the speaker can be moved quickly, but noise and vibration are generated
Solution Approach 1:
The patent applies periodic action through smooth acceleration and deceleration phases. Instead of applying a sudden large moment, the control module uses a time-varying nonlinear function that distributes the motion over time with gradual changes in velocity. This periodic control approach ensures the speaker moves from stationary state smoothly without generating noise and vibration, while still achieving the required operation speed.
3Loss of time
If a rapid decrease in moment is applied to stop the pop-up speaker, then the stopping time is reduced, but noise and vibration are generated
Solution Approach 1:
The patent applies dynamics by using nonlinear deceleration control instead of rapid moment decrease. The control module adjusts the velocity according to a nonlinear function where the deceleration rate varies over time. This dynamic control ensures the speaker stops quickly without generating noise and vibration by smoothly reducing velocity to zero, resolving the contradiction between stopping time and harmful factors.
Data Source
AI summary
In a pop-up speaker control technology capable of reducing noise and vibration generated upon an operation of a pop-up speaker, the pop-up speaker control apparatus includes a driving module configured to pop up or down the pop-up speaker in response to control of an external device, and a processor operatively connected to the driving module and configured to control the driving module in response to a control from the external device, and the processor can control the driving module to operate the pop-up speaker nonlinearly.