• Hypothesis: mechanical system is composed of ideal components carrying either
  • Kinetic energy or
  • Potential energy or
  • Are of purely dissipative behaviour
• Approximation that can be used under the condition that the system components are much smaller than the wavelength of an acting signal
• Basic variables used in the description of translational mechanical systems
  • Force, F
  • Velocity, v
• Basic one-port components
  • Mass, m

• Compliance, c

u ... displacement

k ... spring factor

• Resistance, r

Mechanical system can be symbolized by a circuit composed of three basic elements as shown in the following figure:

• Assignments of variables
  • Force as an effort variable
  • Velocity as a flow variable

• Conventions
  • Effort-to-Voltage convention

Called electro-mechanical analogy I

or direct electro-mechanical analogy

Will be used in this course

• Flow-to-Voltage convention

Called electro-mechanical analogy II