Lattice Composite Shock Absorber With Variable Stiffness and High Damping

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Solution Overview

Problem

Existing shock absorbers for high-end facilities face challenges in achieving optimal vibration and noise reduction, with elastic connections offering insufficient stiffness and high vibration intensity, while rigid connections fail to attenuate vibrations and noise, and lattice composite structures suffer from poor interface bonding and bubble formation during viscoelastic material infiltration.

Innovation Solution

A high-damping stiffness-variable lattice composite structure shock absorber is designed with adjustable pore shape parameters and porosity, using a lattice metal and viscoelastic material combination, where the lattice metal is manufactured via selective laser melting and infiltrated with viscoelastic materials enhanced by nano-scale SiC to ensure bonding strength and bubble-free filling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If elastic connection is used with viscoelastic material shock absorber, then vibration and noise reduction effect is improved, but stiffness is too low and vibration intensity of equipment increases

Engineering Contradiction:

Improvevibration and noise reductionVSAvoidstiffness

Core Design Contradiction:

Object-affected harmful factorsVSStrength

Solution Approach 1:

The patent uses a composite structure combining lattice metal (providing stiffness) and viscoelastic material (providing damping). The lattice metal framework maintains structural rigidity while the infiltrated viscoelastic material provides vibration and noise reduction, resolving the contradiction between stiffness and damping performance.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The lattice metal structure provides controlled porosity (30-90%) that allows viscoelastic material infiltration while maintaining overall structural stiffness. The porous lattice design enables the composite to achieve both high damping characteristics and adequate stiffness by adjusting pore size, shape, and distribution.

Inventive Principle:

Principle #31Porous materials

2Strength

If rigid connection is used without shock absorber, then stiffness and safety are improved, but vibration and noise reduction capability is lost

Engineering Contradiction:

ImprovestiffnessVSAvoidvibration and noise reduction

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The composite structure integrates the stiffness of lattice metal with the damping properties of viscoelastic material, achieving a balance between rigid connection strength and vibration reduction capability that neither connection type can achieve alone.

Inventive Principle:

Principle #40Composite materials

3Object-affected harmful factors

If viscoelastic material is infiltrated into lattice metal with small pore diameters, then damping performance is improved, but interface bonding deteriorates and bubbles form due to insufficient infiltration

Engineering Contradiction:

Improvedamping performanceVSAvoidinterface bonding

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent optimizes infiltration parameters including heating temperature (to reduce viscosity), vacuum degree, and infiltration time to ensure complete filling of small pores while preventing bubble formation and achieving strong interface bonding between viscoelastic material and lattice metal.

Inventive Principle:

Principle #35Parameter changes

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 shock absorber achieves high damping ratios over 10% and variable stiffness between 69-276 kN/mm, effectively reducing vibrations and noise in aeronautics, aerospace, ships, and precision instruments, with improved interface bonding and no bubble defects.

Implementation Method 1

Lattice metal has characteristics of freely adjustable porosity and freely designable pore structure. It is possible to design a lattice structure shock absorber with a stiffness between that of elastic connection and that of rigid connection and realize the design of a stiffness-variable lattice structure shock absorber by adjusting and controlling the porosity.

Methodology Applied

Scientific EffectPorosity: Porosity

Implementation Method 2

viscoelastic material is infiltrated into the lattice structure shock absorber to manufacture a high-damping lattice composite structure shock absorber

Methodology Applied

Scientific EffectViscoelasticity: Viscoelasticity

Implementation Method 3

lattice metal is manufactured via selective laser melting

Methodology Applied

Scientific EffectSelective laser melting: Selective Laser Sintering

Data Source

PatentUS20250327500A1High-damping stiffness-variable lattice composite structure shock absorber, and preparation method therefor

Publication Date: 2025.10.23 SHENYANG RES INST OF FOUNDRY

AI summary

A high-damping stiffness-variable lattice composite structure shock absorber, and a preparation method therefor. The shock absorber is composed of a lattice composite structure and a base, wherein the lattice composite structure is formed by compositing a lattice metal and a viscoelastic material. The adjustment and control range of the porosity of the lattice metal is 30-90%; the hole edge diameter of the lattice metal is 1-3 mm; and the minimum hole diameter is 0.8-2.5 mm. The matrix material of the lattice metal is a steel material; and the matrix material of the viscoelastic material is an epoxy resin or polyurethane.