Hydroelastic Bearing Decoupling Channel for Dynamic Rigidity
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Solution Overview
Problem
Conventional hydroelastic bearings face challenges in adjusting dynamic properties, particularly experiencing high dynamic rigidity at medium-high excitation frequencies and low amplitudes, which affects noise development and damping efficiency.
Innovation Solution
The hydroelastic bearing incorporates a decoupling channel and element arranged in a decoupling recess of the outer sleeve, allowing for adjustable dynamic properties by configuring the decoupling channel and element to direct damping fluid flow between working chambers, preventing dynamic rigidification at low amplitudes and ensuring fluid flow through the damping channel at high amplitudes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a damping channel is provided to connect working chambers for fluid flow, then damping force is generated through dissipation loss, but high dynamic rigidity occurs at medium-high excitation frequencies and low amplitudes
Solution Approach 1:
The bearing is segmented into two independent damping paths: a damping channel for high-amplitude damping and a decoupling channel with isolator for low-amplitude damping. This segmentation allows each channel to specialize in different amplitude ranges, preventing the dynamic rigidity problem that occurs when a single channel handles all amplitude ranges.
Solution Approach 2:
The isolator in the decoupling channel is designed to be dynamically responsive, changing its state based on excitation amplitude. At low amplitudes, the isolator remains flexible allowing fluid flow to prevent dynamic rigidification. At high amplitudes, the isolator closes the decoupling channel, directing flow through the damping channel for effective damping.
2Strength
If an isolator is arranged in a decoupling channel to prevent dynamic rigidification at low amplitudes, then adjustability of dynamic properties is limited
Solution Approach 1:
Different local regions of the bearing are assigned different damping characteristics. The damping channel provides one type of damping behavior while the decoupling channel with isolator provides another. This local differentiation enables sophisticated dynamic property adjustment without requiring the entire system to be redesigned.
Solution Approach 2:
The decoupling channel serves multiple functions: it provides an alternative flow path at low amplitudes to prevent dynamic rigidification, and it can be closed by the isolator at high amplitudes to direct flow through the damping channel. This multi-functionality enhances the bearing's adaptability across different operating conditions.
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
This configuration enhances the adjustability of dynamic properties, reducing dynamic rigidification at low amplitudes and maintaining effective damping, thereby improving the hydroelastic bearing's performance across various excitation frequencies and amplitudes.
Implementation Method 1
The spring body at least partly borders two working chambers for holding a damping fluid. The working chambers can communicate fluidically with each other by a damping channel to permit an exchange of fluid between the working chambers given a specific, relative deflection of the inner mounting connection and outer sleeve and changes in volume to the working chamber caused thereby, and to generate dissipation loss by the flow between the working chambers.
Implementation Method 2
The hydroelastic bearing offers restorative spring force from the use of elastomer material, as well as damping force which is actively generated in the bearing by means of dissipation loss.
Data Source
AI summary
A hydroelastic bearing is provided. The hydroelastic bearing includes a spring function member and an outer sleeve coupled to the spring function member, wherein the spring function member includes an inner mounting connection and at least two working chambers which are filled with a damping fluid and which are connected via at least one damping channel, so that the damping fluid flows from one of the working chambers at least partly to the other via the at least one damping channel upon displacement of the inner mounting connection with respect to the outer sleeve, wherein the working chambers are further connected via at least one decoupling channel, wherein a decoupling element is arranged in a flow path of the decoupling channel, and wherein the decoupling channel and the decoupling element are at least partly arranged in a decoupling recess in the outer sleeve provided therefor.