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The theoretical foundation of a new-type drilling dynamometer (i.e. the torsional effect of a rectangular piezoelectric quartz disc), the structure design and calibration of the drilling dynamometer are investigated in this paper. By using the theory of anisotropic elasticity and the Maxwell electromagnetism, the torsion stress and the distribution of surface charge densities of a rectangular quartz...
Based on the piezoelectric deformation effect (namely, tensile and compressive effect, torsional effect) of the quartz disc, a new type of drilling dynamometer is designed in this paper. The axial force measuring cell is made of two X0deg-cut quartz discs that are mechanically in series and electricity in parallel. The torque measuring cell consists of only three Y0deg-Cut discs and four semicircle...
In this paper, the method to measure moisture content of oil-free pressboard with single frequency experimental method is studied and the paper focuses on the implementation of experimental studies based on dielectrometry. Accurately monitoring and controlling of moisture can be implemented by the measurement of the permittivity of pressboard. A capacitive sensor is used to monitor the dielectric...
The bending effect of a piezoelectric quartz beam is first investigated in the paper. According to the anisotropic elasticity and Maxwell electromagnetic theory, the stress field and electrostatic field is deduced. The distribution of the electric field in the piezoelectric beam is calculated by the Finite Element Method. Based on the theoretical analysis of the bound charge distribution, using the...
In this paper, a capacitive sensor is used to monitor the dielectric response of the pressboard and to calculate the moisture content in the pressboard by using calibrated expressions. The structure of the capacitive sensor and experiment system are introduced. The kinetics of the drying process is discussed. Models of moisture content diffusion and application of the drying kinetics of pressboard...
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