Active Vehicle Seat Vibration Control for Road-Induced Resonance
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Solution Overview
Problem
Existing passive mass dampers for vehicle seats are inadequate in effectively canceling out seat vibrations and resonance caused by road loading during vehicle operation.
Innovation Solution
An active seat vibration dampening system utilizing low-frequency transducers and vibration sensors, where sensors detect seat vibrations and a controller generates counter vibrations to cancel out input vibrations, effectively reducing road load-induced vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If passive mass dampers are used in vehicle seats, then the device complexity is reduced, but the vibration reduction effectiveness deteriorates
Solution Approach 1:
The patent replaces passive mechanical mass dampers with an active control system that uses sensors to detect seat vibrations and transducers to generate counter-vibrations. This substitution of mechanical passive damping with an active electromechanical control system resolves the contradiction by providing superior vibration cancellation effectiveness while accepting increased system complexity.
Solution Approach 2:
The patent implements a feedback control mechanism where sensors continuously monitor seat vibrations and provide real-time data to a controller, which then adjusts the transducer output to generate appropriate counter-vibrations. This closed-loop feedback system enables dynamic adaptation to varying vibration conditions, significantly improving vibration reduction effectiveness compared to passive dampers.
2Object-affected harmful factors
If active vibration control with sensors and transducers is implemented, then the vibration reduction effectiveness is improved, but the device complexity increases
Solution Approach 1:
The patent integrates multiple functions into a unified active control system where the controller manages both sensor data processing and transducer control, and the transducers serve both as actuators for vibration generation and as part of the overall dampening mechanism. This functional integration reduces the number of separate components needed, thereby managing system complexity while maintaining high vibration reduction effectiveness.
3Ease of manufacture
If passive mass dampers are used, then the ease of manufacture is improved, but the resonance cancellation capability deteriorates
Solution Approach 1:
The patent replaces simple mechanical mass dampers with an active control system using sensors and transducers that can dynamically counteract resonance frequencies. This substitution enables effective resonance cancellation through active control, overcoming the limitations of passive dampers while accepting increased manufacturing complexity.
Solution Approach 2:
The patent transitions from static passive mass dampers to a dynamic active control system that continuously adapts its response based on real-time vibration measurements. This dynamic capability allows the system to effectively cancel resonance across varying frequencies and operating conditions, which static passive dampers cannot achieve.
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 provides improved vibration reduction and resonance cancellation compared to passive mass dampers, enhancing passenger comfort by actively counteracting road-generated vibrations.
Implementation Method 1
a transducer that generates the counter vibration of the vehicle seat in response to the control signal to dampen the sensed vibration of the vehicle seat
Data Source
AI summary
The present disclosure provides a vehicle seat vibration dampening system including a vibration sensor that senses vibration of a vehicle seat generated by movement of a vehicle on a roadway, wherein the vibration sensor generates a signal indicative of the sensed vibration, a controller that determines, based on the signal generated by the vibration sensor, a counter vibration to dampen the sensed vibration of the vehicle seat and, based on the determination, produces a control signal to effect generation of the counter vibration, and a transducer that generates the counter vibration of the vehicle seat in response to the control signal to dampen the sensed vibration of the vehicle seat.