Active Suspension Phase Control for Vibration Isolation
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Solution Overview
Problem
Vehicles experience unwanted motion due to disturbances in their environment, leading to discomfort, motion sickness, and potential loss of control, while residual vibrations from engines cause fatigue, even on smooth roads.
Innovation Solution
An active suspension system with a low-bandwidth force bias eliminator and a high-bandwidth electromagnetic actuator, where the actuator's motion is within a 45-degree phase angle with the vehicle's center of gravity, providing actuation force through the center of gravity and using a crossover frequency of 1/3 Hz to separate frequency ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a single high-bandwidth actuator is used to suppress all vibrations, then vibration suppression performance is improved, but power consumption increases and control complexity increases
Solution Approach 1:
The patent divides the vibration suppression task into two frequency bands: low-frequency force bias (0-0.5 Hz) handled by a force bias eliminator and high-frequency vibrations (0.5-20 Hz) handled by an electromagnetic actuator. This segmentation allows each component to operate optimally in its designated frequency range, reducing overall power consumption while maintaining effective vibration suppression.
Solution Approach 2:
The force bias eliminator handles only the low-frequency force bias component rather than the entire vibration spectrum, allowing the electromagnetic actuator to focus on high-frequency vibrations. This partial action approach reduces the power burden on the electromagnetic actuator while maintaining comprehensive vibration suppression.
2Use of energy by moving object
If a force bias element operates at low bandwidth, then power consumption is reduced, but vibration suppression capability at higher frequencies is insufficient
Solution Approach 1:
The patent segments the vibration suppression function across two components: the force bias eliminator handles low-frequency force bias with minimal power consumption, while the electromagnetic actuator supplements high-frequency vibration suppression. This segmentation allows each component to operate within its optimal performance and power consumption characteristics.
Solution Approach 2:
The force bias eliminator acts as an intermediary that removes the low-frequency force bias component, allowing the electromagnetic actuator to focus on high-frequency vibrations without being burdened by the power-intensive task of counteracting gravitational force bias throughout the entire frequency spectrum.
3Ease of operation
If the electromagnetic actuator operates with large phase angle deviation from center of gravity motion, then control simplicity is improved, but vibration isolation effectiveness decreases
Solution Approach 1:
The patent employs feedback control where the electromagnetic actuator's operation is continuously adjusted based on the phase relationship with the plant's center of gravity motion. The controller maintains the phase angle within 45 degrees by monitoring and adjusting the actuator's output, ensuring effective vibration isolation while maintaining control simplicity through automated phase compensation.
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
Effectively reduces unwanted motion and vibrations, enhancing passenger comfort by isolating the vehicle from disturbances and minimizing power consumption, while maintaining control and safety.
Implementation Method 1
an active suspension including an electromagnetic actuator coupled to the plant and having a high bandwidth, the electromagnetic actuator providing an actuation force
Data Source
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AI summary
A method for actively suspending a real plant in a vehicle includes modifying a control signal on the basis of a difference between a property of the real plant, as indicated by the response of the real plant to the control signal, and a property of a nominal plant.