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| Research Interests |
| Residual Stress High-energy Ultrasonic Regulation System |
| Function Summary |
| By the environment and conditions restrictions, when residual stress occur in the in-service mechanical components such as large metal truss structure, hull, pressure vessel, plate component, airframe, car body and guide rail, it’s unable or difficult to use the traditional methods such as tempering, loading and shock vibration to relieve or change the residual stress state. Residual stress high-energy acoustic field regulation system can solve the above problems and realizes the in situ elimination, suppression and reconstruction regulation functions for local residual stress distribution of in-service mechanical components which improves the overall service mechanical components strength, fatigue resistance and corrosion resistance ability, enhances the reliability, security and service life of components. |
| Technical features |
| This technology is suitable for residual stress regulation for welding, riveting and shot peening of all kinds of steel and aluminum alloy. This new regulation technology has a good effect in stress relieving, low cost, small energy consumption, fast, convenient for realizing the in situ elimination, suppression and reconstruction regulation functions for local residual stress distribution of in-service mechanical components. |
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| Residual Stress High-energy Ultrasonic Regulation System |
| Specifications |
| Regulation Frequency:15-21KHZ |
| Regulation Power, For individual high-energy ultrasonic transducer: ≥100W |
| Regulation Equivalent Area: ≤50mm×50mm, adjustable |
| Stress Regulation Reduction Rate: once rate ≥30%, eventually rate ≥50%, regulation number of times ≤3 |
| Single Point Regulation Time: ≤30min |
| Effective Regulation Depth: ≤15mm |
| Technical principle |
| Through ultrasonic signal incentive multi-channel controller controls high power ultrasound amplifier to generate drive signal, the drive signal excites high-energy ultrasonic transducer to generate different frequency and phase high-energy ultrasound beams. The high power ultrasound beam energy is injected into the stress regulation area and the original dislocation structure is properly changed by combing with acoustic resonance and local heating which realizes the in situ elimination, suppression and reconstruction regulation functions for local residual stress distribution of in-service mechanical components. To measure the residual stress of component with a residual stress measurement transducer and to transmit the signal to the ultrasonic signal processing module, processing module will deliver the residual stress information in real time to the residual stress closed-loop controller, closed-loop controller and ultrasonic signal incentive multi-channel controller are linked together, a residual stress closed-loop control system is formed eventually. |
| Applications |
| This system has been applied to aluminum alloy welding plate for NORINCO Group, thin-wall big size welding spacecraft for Seventh Academy of China Aerospace Science and Industry Corporation, mobile aluminum alloy mold for Foxconn (Shenzhen) and rail for Taiyuan Railway Section, etc. residual stress regulation and obtains good results. |
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