Stress monitoring device of elasto-magneto-electric (EME) effect type

摘要

A stress monitoring device of elasto-magneto-electric (EME) effect type, for monitoring stress of a structural component of ferromagnetic materials, includes a magnetic field generating unit, a magneto-electric (ME) sensing unit, a support skeleton, and a signal controlling and conditioning instrument. Under the control of the signal controlling and conditioning instrument, the magnetic field generating unit generates a magnetic field for magnetizing the structural component. The ME sensing unit outputs an electrical signal VME characterizing the magnetic field without a need of external power supply. This electrical signal VME is analyzed and processed by the signal controlling and conditioning instrument to output a magnetic characteristic value Vst corresponding to the changes of the external forces that are exerted on the component. This stress monitoring device realizes on-line, real-time, and nondestructive monitoring, as well as off-line nondestructive monitoring.

主权项

1. A stress monitoring device of elasto-magneto-electric (EME) effect type, for monitoring stress on arbitrary cross-sections of a ferromagnetic component in a real-time way, the device comprising:
one or more magnetic field generating units; one or more magneto-electric (ME) sensing units; one or more support skeletons; and a signal controlling and conditioning instrument comprising a drive circuit and a data acquisition and processing device;wherein:
said ferromagnetic component is subjected to tension, compression, bending, torsion, or a combination thereof; said arbitrary cross-sections have arbitrary shapes; said one or more magnetic field generating units are adapted to generate a magnetic field in a detected area around the ferromagnetic component, wherein the ferromagnetic component is magnetized by the magnetic field; said one or more support skeletons are used to set up said one or more magnetic field generating units and fix said one or more ME sensing units; said one or more ME sensing units are disposed in one or more locations near the arbitrary cross-sections; said one or more ME sensing units comprise ME laminated composites; said one or more ME sensing units are adapted to sense said magnetic field and to produce an electrical signal VME in response to said magnetic field, wherein said electrical signal VME corresponds to an intensity of said magnetic field at said one or more locations; said drive circuit is connected to said one or more magnetic field generating units and controls said one or more magnetic field generating units to generate said magnetic field; and said one or more ME sensing units are connected to said data acquisition and processing device, wherein said one or more ME sensing units send said electrical signal VME to said data acquisition and processing device, and said data acquisition and processing device receives said electrical signal VME and processes said electrical signal VME to obtain a magnetic characteristic value Vst after signal conditioning, wherein said magnetic characteristic value Vst is corresponding to the value of the stress.