Active Shock Absorber Mount Vibration Control Using Dual Acceleration Signals
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Solution Overview
Problem
Passive vibration damping systems using rubber elements in vehicles are ineffective in attenuating vibrations across various driving conditions and road surfaces, leading to residual vibrations and noise, which compromise passenger comfort.
Innovation Solution
An active vibration reduction method that generates a forcing signal using detected acceleration data from upstream and downstream regions of passive damping elements, combined with a numerical model simulating mechanical response, to activate a vibrator and compensate for vibrations, thereby reducing residual vibrations and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If passive vibration damping systems using rubber elements are used, then the system structure is simple and cost-effective, but the vibration attenuation effectiveness is insufficient under various driving conditions and road surfaces
Solution Approach 1:
The patent transitions from static passive rubber elements to dynamic active vibration control. Sensors continuously monitor vibration parameters, and actuators dynamically adjust counteracting forces in real-time, enabling the system to adapt to varying driving conditions and road surfaces, thereby significantly improving vibration attenuation effectiveness.
Solution Approach 2:
The patent implements a closed-loop feedback control system where sensors detect vibration signals, the controller processes this information, and actuators apply corrective forces. This feedback mechanism enables continuous optimization of vibration compensation, resolving the contradiction between simple structure and effective attenuation by using intelligent control rather than complex mechanical design.
2Adaptability or versatility
If passive damping elements are adjusted to damp the entire frequency range fairly and stably, then the system is stable under various driving conditions, but it cannot effectively attenuate specific forcing forces and frequencies that need the most attenuation
Solution Approach 1:
The active control system dynamically adjusts its damping characteristics based on real-time vibration measurements. The controller can selectively target specific frequency components and forcing forces, providing adaptability to different vibration scenarios while maintaining overall system stability through continuous control adjustments.
Solution Approach 2:
The patent applies different damping strategies to different frequency ranges and vibration modes. The control system identifies specific problematic frequencies and applies targeted counteracting forces, rather than using uniform damping across all frequencies, thereby achieving both adaptability and stability.
3Object-affected harmful factors
If additional passive soundproofing elements are added to reduce noise from residual vibrations, then noise reduction is achieved, but the system complexity and cost increase
Solution Approach 1:
The patent replaces passive acoustic soundproofing with active mechanical vibration control. Instead of blocking sound paths with acoustic materials, the system uses sensors and actuators to mechanically counteract the source vibrations, eliminating noise at its origin without requiring additional acoustic devices or increased system complexity.
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 compensates for vibrations under different driving conditions, improving passenger comfort by directly addressing vibration components that passive systems cannot handle, and reducing noise without additional acoustic devices.
Implementation Method 1
the elastic element made of rubber, the function of which is to filter out vibrations which could be transmitted from the shock absorber to the body
Implementation Method 2
detecting a first signal or datum dm relating to an acceleration of a first region 11 of the vehicle subjected to vibrations
Implementation Method 3
activating an actuator 4 to compensate for the vibrations acting on the first region 11 and/or the second region 12
Data Source
Figure 1
Figure 1a
Figure 2
AI summary
A method of generating a forcing signal (u3) for the active vibration reduction for a top shock absorber mount (10) or for a vehicle engine suspension mount (20) comprises the steps of: a) detecting a first signal or datum (dm) relating to the acceleration of a first region (11) of the vehicle subjected to vibrations upstream of the passive vibration damping element (30, 30') in the direction of propagation of the vibrations (X); b) detecting a second signal or datum (dm) relating to the acceleration of a second region (12) of the vehicle subjected to vibrations downstream of the passive damping element (30, 30') of the vibrations (30); c) on an electronic unit, generating a forcing signal (u3) as a function of the first signal or datum (dm) and of the second signal or datum (y), said forcing signal (u3) being suitable to activate a vibrator device (A) to compensate for the vibrations acting on the first region (11) and/or on the second region (12) at least partially.