Magnetorheological Fluid Bumper With Three-Stage Impact Damping
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Solution Overview
Problem
Existing magnetorheological fluid automobile bumpers do not provide an ideal damping effect, leading to significant damage during collisions.
Innovation Solution
A magnetorheological fluid bumper design comprising a rear bumper body with symmetrical front bumper bodies, connecting rods, and magnetorheological fluid buffers, utilizing springs and magnetic fields to achieve multiple buffering and damping effects through sequential engagement of springs and magnetorheological fluid viscosity changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetorheological fluid is used in automobile bumpers to reduce impact damage, then the damping effect is improved, but the structural complexity increases due to multiple components including outer sleeves, inner sleeves, extrusion blocks, and buffer blocks
Solution Approach 1:
The patent employs nested structure where the inner sleeve containing magnetorheological fluid is placed inside the outer sleeve, extrusion blocks are nested within the inner sleeve, and buffer blocks are nested within fluid outlets. This nested arrangement achieves complex damping functionality through layered components while maintaining a compact overall structure, resolving the contradiction between improved damping effect and structural complexity.
Solution Approach 2:
The bumper system is segmented into multiple functional modules: front bumper bodies, connecting rods, magnetorheological fluid buffers with distinct components (outer sleeves, inner sleeves, extrusion blocks, buffer blocks), and springs. Each segment performs a specific function in the damping process, allowing the system to achieve reliable multi-stage damping while maintaining manufacturability and ease of assembly.
2Object-affected harmful factors
If multiple buffering and damping stages are implemented using springs and magnetorheological fluid, then the protection effect against impact damage is improved, but the device complexity increases
Solution Approach 1:
The patent implements dynamic damping characteristics through the magnetorheological fluid which changes its viscosity in response to impact forces. The fluid transitions from a less viscous state during normal operation to a highly viscous state during impact, providing adaptive damping without requiring complex active control systems. This dynamic behavior enables multi-stage buffering while maintaining relatively simple device structure.
Solution Approach 2:
The magnetorheological fluid's viscosity parameter changes dramatically under magnetic field influence during impact events. This parameter change enables the fluid to transition between different damping states, providing multiple buffering stages. The extrusion blocks and buffer blocks utilize this parameter change to create sequential engagement mechanisms that enhance protection without proportionally increasing device complexity.
3Reliability
If magnetorheological fluid buffers with multiple components are used, then the damping performance is improved, but the manufacturing difficulty increases
Solution Approach 1:
The magnetorheological fluid buffer is segmented into separately manufacturable components including outer sleeves, inner sleeves, extrusion blocks, and buffer blocks. Each component can be manufactured independently using standard machining processes, then assembled together. This segmentation improves damping performance through precise component design while facilitating easier manufacturing and quality control compared to monolithic structures.
Solution Approach 2:
The nested arrangement of components (inner sleeve within outer sleeve, extrusion blocks within inner sleeve, buffer blocks within fluid outlets) allows for efficient packaging and assembly. Components can be pre-assembled in nested configurations and then integrated into the overall bumper system, reducing assembly complexity despite the multi-component design. This nesting strategy enables high damping performance while maintaining manufacturing feasibility.
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 design effectively reduces impact damage to vehicles and occupants by realizing three distinct buffering and damping stages, enhancing safety through sequential engagement of springs and magnetorheological fluid viscosity changes under magnetic influence.
Implementation Method 1
The magnetorheological fluid is a novel fluid with controllable fluidity... When a magnetic field is applied, the magnetorheological fluid is Bingham fluid with high viscosity and low fluidity
Implementation Method 2
The inner wall of the outer sleeve at the end away from the push rod is provided with second springs... A third spring is arranged in the inner sleeve
Data Source
AI summary
Disclosed is a magnetorheological fluid automobile bumper, and belongs to the field of automobile bumpers. The magnetorheological fluid automobile bumper comprises a rear bumper body, wherein two front bumper bodies are symmetrically hinged to the front side of the rear bumper body, the ends, close to each other, of the two front bumper bodies are in butt joint with each other, a connecting rod is jointly installed between the front bumper body and the rear bumper body, one end of the connecting rod is hinged to the front bumper body, and the other end of the connecting rod is slidably installed with the rear bumper body; and a plurality of magnetorheological fluid buffers are installed on the rear side of the rear bumper body.