you can asume the values.
- Use The Equation Of Twy S To Find The Harmonicresponse And Diagram In Matlab You Can Asume The Values 1 (11.04 KiB) Viewed 37 times
- Use The Equation Of Twy S To Find The Harmonicresponse And Diagram In Matlab You Can Asume The Values 2 (72.27 KiB) Viewed 37 times
The sensor capable of such measurement, called an inertial sensor, provides the measurement of an absolute quantity only in some frequency range. The basic principle of an inertial sensor is depicted It is constituted of a seismic mass m, attached to the measurement point through a suspension, represented by a spring k and a dashpot c. The dynamics of the sensor reads mºx + c(x-w) +k (x - W) = 0 where x and w are Then, the measurement of y = x - wis used to evaluate w. Writing in the function of y gives mºy + c'y + ky = -m "w Using the Laplace transform, becomes ms2 y + CSY + KY = -ms2 W the transmissibility Tw x(s) between the displacement of the attachment point W (s) and the relative displacement Y (s) is given by Twy (s) = Y (s)/W (s) = -ms? | ms2 + cs +k the wo is decreased. This is the main reason why seismic accelerometers usually rely on a soft mounting of the seismic mass and a coil, a capacitive or a piezoelectric transducer to measure y, while in broadband accelerometers, only a piezoelectric ceramic is often used, providing both a stiff mount and a measurement of y. Still, some attempts at low-frequency piez Jelectric accelerometers are reported in the literature but cannot outperform the electromagnetic systems treated.