Active Seat Vibration Cancellation via Accelerometer Filtering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle seat vibration reduction systems rely on passive isolation methods like air bladders and mechanical shocks, which do not provide active vibration cancellation and increase manufacturing costs, failing to effectively mitigate operator discomfort from various vibrations during vehicle operation.
Innovation Solution
A system comprising a motor in mechanical communication with a control arm, a processor, and memory that receives accelerometer measurements, applies filters to isolate resonant frequencies, and selectively controls the motor to counteract seat vibrations based on operator preferences and motor position/speed, providing both passive and active vibration cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If passive isolation methods (air bladders, mechanical shocks) are used to reduce seat vibrations, then operator comfort is improved, but manufacturing costs increase and vibration cancellation effectiveness is insufficient
Solution Approach 1:
The patent replaces passive mechanical isolation systems (air bladders, mechanical shocks) with an active vibration cancellation system that uses sensors to detect vibrations and actuators to generate counteracting forces. This substitution eliminates the need for complex passive isolation components while providing more effective vibration mitigation through real-time active control.
Solution Approach 2:
The system dynamically changes operational parameters by adjusting the counteracting forces generated by actuators based on real-time vibration measurements. The control system modifies force magnitude and frequency characteristics to optimally cancel vibrations across different operating conditions, providing adaptive vibration cancellation without fixed mechanical configurations.
2Object-affected harmful factors
If passive isolation components are installed in the seat, then some vibration reduction is achieved, but the system complexity and manufacturing cost increase without providing active vibration cancellation
Solution Approach 1:
The patent replaces complex passive isolation components with a streamlined active control system consisting of sensors, processors, and actuators. This substitution reduces mechanical complexity while enabling intelligent, adaptive vibration cancellation that responds to real-time conditions rather than relying on fixed mechanical properties.
Solution Approach 2:
The vibration cancellation system is self-regulating through feedback control. Sensors continuously monitor vibrations, the processor analyzes the data and determines required counteracting forces, and actuators automatically adjust their output to cancel detected vibrations. This closed-loop self-service operation eliminates the need for complex mechanical adjustment mechanisms.
3Productivity
If traditional strain reduction components are used, then operator isolation from vibrations is partially achieved, but productivity is reduced due to increased manufacturing costs and inadequate vibration cancellation
Solution Approach 1:
The patent replaces traditional strain reduction components with an active vibration cancellation system that provides superior protection against vibrations. This substitution enables operators to work longer periods with reduced fatigue and discomfort, directly improving productivity while maintaining lower manufacturing costs compared to passive isolation 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 system effectively reduces operator perception of vibrations by actively counteracting seat movements, enhancing comfort and productivity while reducing manufacturing costs through active vibration cancellation.
Implementation Method 1
receive, from an accelerometer, a plurality of accelerometer measurements associated with acceleration corresponding to vibration of at least a component of a seat
Implementation Method 2
selectively control the motor based on the absolute magnitude value of the accelerometer measurement output
Data Source
AI summary
A method for cancelling seat vibration includes receiving, from an accelerometer, a plurality of accelerometer measurements and applying a first filter to the plurality of accelerometer measurements to remove accelerometer measurements of the plurality of accelerometer measurements having a frequency above a first threshold frequency. The method also includes applying a second filter to an output of the first filter to remove accelerometer measurements of the output of the first filter having a frequency above a second threshold frequency and applying a third filter to an output of the second filter to generate an accelerometer measurement output having a center frequency corresponding to a resonant frequency of the vibration of the at least one component of the seat. The method also includes determining an absolute magnitude value of the accelerometer measurement output and selectively controlling a motor based on the absolute magnitude value of the accelerometer measurement output.