Force-voltage analogy

Parameters Force-Voltage Analogy Force-Current Analogy... 

Some twenty years ago Cheng in his book on analysis of linear systems, pointed out that electrical and physical measurements were analogus since they are governed by similar mathematical relationships. This permits the construction of the force-voltage analogy shown in Table 2. One could thus speculate that... 

Table 2 Force-Voltage Analogy Mechanical System Electrical System...

Thus, in an isothermal system, the mass flow rate depends on the difference in pressures of the gas across the orifice and does not depend upon the thickness of the plate. One may define an area-normalized resistance, R, for mass transfer through the orifice using a generalization of Ohm s law, i.e., Resistance = force/ flux. For Knudsen flow, the force is the pressure difference (analogous to voltage difference in Ohm s law) and the flux is the mass flow per unit area of the hole (analogous to the electrical current density in Ohm s law). Thus, we have... 

The Brunauer type I is the characteristic shape that arises from uniform micro-porous sorbents such as zeolite molecular sieves. It must be admitted though that there are indeed some deviations from pure Brunauer type I behavior in zeoHtes. From this we derive the concept of the favorable versus an unfavorable isotherm for adsorption. The computation of mass transfer coefficients can be accompHshed through the construction of a multiple mass transfer resistance model. Resistance modehng utilizes the analogy between electrical current flow and transport of molecular species. In electrical current flow voltage difference represents the driving force and current flow represents the transport In mass transport the driving force is typically concentration difference and the flux of the species into the sorbent is resisted by various mechanisms. 

The heat flow is directly proportional to the difference in temperature between the two surfaces. The driving force of temperature difference is analogous to the potential difference (voltage) in an electric circuit and so XmAm/5 is the thermal conductance and its inverse... 

The value of the total mass transfer resistance is the inverse of the overall mass transfer coefficient value. This equation is analogous to Ohm s Law which relates current flow (flux) to apphed voltage (driving force) ... 

Can acoustic phenomena be described by electrical circuits Yes, they can, by means of the electromechanical analogy, that maps forces onto voltages... 

Analogously, in electrostatic force microscopy (EFM) electrostatic forces can be used in the regulation feedback [228, 229], Ferroelectric media can be polarized by a voltage applied to a conductive AFM probe in contact (writing). The surface polarization leads to a long range force that can be detected via interaction with the probe at low bias. This interaction force is used as feedback in noncontact mode (reading). 

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