Essentially, the goal of the transmission line is to minimize acoustical or mechanical impedance at frequencies corresponding to the driver's fundamental free air resonance.
22.
Mr . Bodine introduced the concept of resonant vibration that effectively eliminated the reactance portion of mechanical impedance, thus leading to the means of efficient sonic power transmission.
23.
From this, a mechanical impedance can be defined in terms of the imaginary angular frequency, " j? ", which entirely follows the electrical analogy.
24.
The impedance parameters here are a mixture of units; is an electrical impedance, is a mechanical impedance and the other two are transimpedances in a hybrid mix of units.
25.
The root system of white spruce is highly variable and adaptable ( Wagg 1964, 1967 ), responding to a variety of edaphic factors, especially soil moisture, soil fertility, and mechanical impedance.
26.
The element z _ { 22 } \, is the open circuit mechanical impedance, that is, the impedance presented by the mechanical side of the transducer when no current is entering the electrical side.
27.
Careful choice of the mass of the blocks, and the stiffness and length of the damper cable would match the mechanical impedance of the damper to that of the line, and greatly attenuate oscillation of the main cable.
28.
The transformer acts as an impedance converter in the sense that a mechanical impedance, " Z " m, appears as an electrical impedance, " Z " el, across the electrical ports ."
29.
The element z _ { 22 } \, is the open circuit mechanical impedance, that is, the impedance presented by the mechanical side of the transducer when no current ( open circuit ) is entering the electrical side.
30.
Using the analogy to electrical impedance where impedance is the ratio of voltage output to current input ( e . g . resistance is voltage divided by current ), mechanical impedance is the ratio of force output to motion input.
