The speed of sound in Baker DB-grade castor oil has been measured at temperatures between 0° and 40°C and pressures between atmospheric and 110 MPa (megapascals). The data have been fitted with an empirically determined equation.

Articles you may be interested inModeling of piezoelectric ceramic vibrators including thermal effects. Part III. Bond graph model for onedimensional heat conduction Highly accurate data obtained from measurements on three different formulations of lead zirconate titanate piezoelectric ceramic material show the dependence of g3J' d)), and Kj3 on one-dimensional stress (applied parallel to the direction of polarization) to high values of stress (0-400 MPa). The constants for one type of ceramic vary with stress less than those of the other two types for high values of stress. A peak in the curve of tanS as a function of T3 for two types of materials is a function of the material, and it is believed that the peaks are due to a phase transition from the ferroelectric tetragonal to the ferroelectric rhombohedral state. The experimental feasibility and practicability of using a reciprocity coupler to measure g33 and Kr3accurately as a function of one-dimensional stress to high values of stress has been established.

A high-sensitivity piezoelectric accelerometer has been developed to monitor and characterize low-level vibration spectra in large structures. The theory of accelerometer design is traced and applied to a specific problem to develop a set of design criteria. The construction and calibration of the accelerometer is described. The accelerometer has a sensitivity of 2.82 V/g (9.0 dB re 1 V/g) at frequencies to 1 kHz. The use of the accelerometer in conjunction with a real-time spectrum analyzer to identify vibration sources and characterize their ’’signatures’’ is described.

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