Pipeline Throttle Resonance Suppression in Braking Systems
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Solution Overview
Problem
In vehicle braking systems, particularly in electric and hybrid vehicles, pressure pulsation in pipelines leads to resonance and abnormal noise due to the close resonance frequency matching the pulsation frequency, causing discomfort and noise issues, especially during automated driving.
Innovation Solution
A pipeline with a throttle formed at a specific position corresponding to the abdominal part in the vibration mode, where the resonance frequency is closest to the pulsation frequency, having an elliptical sectional shape with its long diameter direction aligned with the maximum amplitude direction, effectively separating the resonance frequency from the pulsation frequency and reducing vibration and pressure loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a throttle is provided in the pipeline to suppress pressure pulsation, then pressure pulsation is reduced, but the throttle position is not optimized for resonance suppression
Solution Approach 1:
The patent applies parameter changes by modifying the throttle's positional parameter to specifically target the abdominal part position in the pipeline. This position corresponds to the point of maximum amplitude in the vibration mode where resonance frequency is closest to pulsation frequency, thereby optimizing the throttle's effectiveness in suppressing both pressure pulsation and resonance simultaneously.
Solution Approach 2:
The patent applies local quality by creating a localized structural modification at the abdominal part position. The throttle is formed only at this specific location where the pipeline's vibration amplitude is maximum, rather than uniformly distributing flow restriction throughout the pipeline. This localized approach maximizes resonance suppression effectiveness while minimizing overall flow resistance.
2Object-affected harmful factors
If the resonance frequency is close to the pulsation frequency, then resonance occurs in the pipeline, but adding a throttle increases device complexity
Solution Approach 1:
The patent applies dynamics by utilizing the natural vibration characteristics of the pipeline system. Instead of adding active control mechanisms or complex damping devices, the solution leverages the pipeline's inherent dynamic properties - specifically identifying the abdominal part position where vibration amplitude is maximum - and introduces a simple throttle at that location to dynamically interact with and suppress the resonance.
Solution Approach 2:
The patent applies the intermediary principle by using the throttle as a mediating element between the pressure pulsation source and the resonance vibration problem. The throttle, positioned at the abdominal part, acts as an intermediary that dissipates energy from the pressure pulsation waves at the point of maximum vibration amplitude, thereby suppressing resonance without requiring direct modification of the pulsation source or complex pipeline restructuring.
3Object-affected harmful factors
If the throttle is positioned at the abdominal part to suppress vibration amplitude, then resonance vibration is reduced, but flow passage sectional shape must be changed
Solution Approach 1:
The patent applies local quality by making the flow passage sectional shape change only at the specific abdominal part position where the throttle is located. The majority of the pipeline maintains its original circular cross-section, while only the localized throttle region has a modified elliptical or irregular shape. This localized geometric modification minimizes the overall impact on flow characteristics while effectively suppressing vibration at the critical position.
Solution Approach 2:
The patent applies asymmetry by changing the flow passage sectional shape from a symmetric circular form to an asymmetric elliptical or irregular form at the throttle position. This asymmetric shape creates flow separation and turbulence that dissipates vibration energy, while the asymmetric geometry is specifically oriented to match the direction of maximum vibration amplitude at the abdominal part, enhancing the suppression effect.
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 solution suppresses pipeline vibration and noise caused by pressure pulsation, minimizing abnormal noise transmission to the vehicle body while maintaining braking performance and reducing manufacturing costs by simplifying the throttle formation process.
Implementation Method 1
As a resonance frequency of the pipeline and a pulsation frequency of pressure pulsation get closer to each other, resonance happens in the pipeline
Implementation Method 2
the vibration mode of the pipeline body before the throttle is formed in which a resonance frequency is the closest to a pulsation frequency
Data Source
AI summary
A pipeline includes a pipeline body in which fluid flows and a throttle formed at a specific position of the pipeline body as a flow passage sectional shape of the pipeline body is changed from that of a remaining portion of the pipeline body. The specific position at which the throttle is provided is a position in the pipeline body and corresponds to a position that serves as an abdominal part of the pipeline in a vibration mode where a resonance frequency is the closest to a pulsation frequency of pressure pulsation caused by the fluid.