An efficient model for improving performance of vibrating-wire instruments

Analytical Model for Estimation of Maximum Normal Stress in Steel Beam‐Columns Based on Wireless Measurement of Average Strains from Vibrating Wire Strain Gages

“…After the installation of the gage, the length of the wire changes due to the action of external forces such as compression or tension. Upon the change in the strain of the wire due to contraction or elongation, ε is expressed in terms of the change in the natural frequency of the wire (Geokon, ; Yu and Gupta, ), as where k is the gage factor determined from the physical properties and the length of the wire. Note that, f 1 and f 2 are the natural frequencies of a wire before and after the deformation, respectively.…”

Measurement of Maximum Strain of Steel Beam Structures Based on Average Strains from Vibrating Wire Strain Gages

“…After installation of the sensor at the surface of the steel beam, the length of the wire changes due to the action of external forces such as compression or tension. Then, the change in the strain of a VWSG due to the elongation or contraction at the time of i th reading, ɛ , is expressed in terms of the change in the natural frequency of the wire 11,12 where f i and ɛ i are the natural frequency and the strain of a wire at the i th reading, respectively.…”

“…Fiber optic sensors (FOSs) and vibrating wire strain gages (VWSGs) are free from electromagnetic interference (EMI) and have excellent endurance, so they are actively studied and applied in the related field lately 3–12 . In case of FOSs including LOFOSs, although many field applications are reported in various fields, 5,6 so far it is impossible to avoid employment and handling of lengthy cables between the FOSs and data logger.…”

“…In contrast with FOSs, VWSGs seem to be more utilized sensors in monitoring of buildings and civil structures because the physical size of the data logger for VWSGs is relatively smaller than that of FOSs, thus, those can be applied to wireless communication between the VWSGs and data logger 7–9 . For this reason, recently, VWSGs are frequently used in various fields of structural health monitoring 7–12 …”

Enhanced Vibrating Wire Strain Sensor

“…Additional advantage of this sensor is that information is included in the frequency of Resonant frequency of vibrating wire sensor can be calculated using (1) [2,3]: 21 p where change in length 1, tension force F or longitudal mass density ,u change the resonant frequency of wire. Same equation can be written as (2) [1,4] and frequency f0 of pretensioned wire can be calculated using (3)[1]:…”