Composite Axial Energy Consumption Device Using Piezoelectricity and Shape Memory Alloy
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Solution Overview
Problem
Steel truss members in construction are prone to fatigue cracks and defects under long-term dynamic cyclic loading, leading to reduced structural bearing capacity and durability, which affects their performance and service life.
Innovation Solution
A composite axial energy consumption device combining piezoelectricity and shape memory alloy (SMA) technology, where mechanical energy is converted into electric energy using piezoceramics and then into heat energy through resistance wires, while SMA wire bundles manage tension and deformation, effectively consuming energy and reducing structural dynamic response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional steel truss members are used under long-term dynamic cyclic loading, then the structure can maintain simple construction and good overall performance, but fatigue cracks and defects occur leading to reduced bearing capacity and durability
Solution Approach 1:
The patent converts the harmful mechanical energy from dynamic cyclic loading into useful electrical energy through piezoelectric materials. The vibration and stress that would normally cause fatigue damage are transformed into electrical signals that can be harvested and used, thereby reducing the harmful effects and extending service life
Solution Approach 2:
The patent employs composite materials including piezoelectric ceramics, shape memory alloys, and damping materials integrated into the steel truss structure. These composite materials provide multiple functions simultaneously: energy harvesting, damage mitigation, and structural reinforcement, thereby improving reliability and durability under dynamic loading
2Loss of energy
If piezoelectric energy consumption device is added to steel truss members, then energy consumption efficiency is greatly increased, but device complexity increases
Solution Approach 1:
The patent integrates multiple functions into single components: the piezoelectric elements serve both as structural elements and energy harvesting devices; the shape memory alloy wires provide both structural reinforcement and energy dissipation. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in overall device complexity while achieving high energy consumption efficiency
3Strength
If SMA wire bundles are used to bear tension, then large allowable deformation and recoverable deformation are achieved, but the device complexity increases
Solution Approach 1:
The patent utilizes the unique properties of shape memory alloys that allow large deformations and full recovery through temperature or stress changes. By selecting appropriate SMA wire specifications and preloading parameters, the system achieves high tension resistance and deformability without requiring complex mechanical systems, as the material properties themselves provide the necessary functionality
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 enhances energy consumption efficiency, improves mechanical performance, and extends the service life of steel truss structures by converting mechanical energy into heat energy and utilizing SMA wire bundles for high tension resistance and self-centering capabilities, offering adjustable and maintainable structural solutions.
Implementation Method 1
The axial pressure on a steel pipe is converted into electric energy by using a piezoelectric effect principle
Implementation Method 2
the electric energy is converted into heat energy for consumption by using a resistance wire
Implementation Method 3
Shape memory alloy (SMA) wire bundles are used to bear tension to realize the advantages of large allowable deformation and recoverable deformation
Data Source
AI summary
The present invention belongs to the technical field of structural vibration control, and provides a composite axial energy consumption device based on piezoelectricity and shape memory alloy, comprising a screw, steel pipes, stiffening ribs, steel sheets, bolt-nuts, piezoceramics, screw caps and SMA wire bundles. The mechanical energy of the structure under pressure is converted into the electric energy of the piezoceramics and then the electric energy is converted into heat energy, so that energy consumption efficiency is high and mechanical performance is good. The SMA wire bundles have large tensile bearing capacity, shape memory effect and good corrosion resistance and fatigue resistance. The number of the segments and the specifications of the piezoceramics and the SMA wire bundles can be adjusted according to the actual needs, so that the structure can be adjusted according to the size of an axial force and specific stress conditions.