The first order or the principal parametric resonance is achieved when the driving / excitation frequency is twice the natural frequency of a given system.
12.
Techniques to avoid flutter include changes to the structure's aerodynamics, stiffening the structure to change the excitation frequency and increasing the damping within the structure.
13.
In particular, the United States HomeAgain scanner didn't change excitation frequency when ISO-read capability was added; it's still a single frequency, 125 kHz scanner.
14.
This method uses a large resistance ( e . g ., 500 to 1000 ohms ) in series with the driver and a signal generator is used to vary the excitation frequency.
15.
Roughly speaking, practical systems are tuned to either move the main mode away from a troubling excitation frequency, or to add damping to a resonance that is difficult or expensive to damp directly.
16.
In fluorescence microscopy, dichroic filters are used as beam splitters to direct illumination of an excitation frequency toward the sample and then at an analyzer to reject that same excitation frequency but pass a particular emission frequency.
17.
In fluorescence microscopy, dichroic filters are used as beam splitters to direct illumination of an excitation frequency toward the sample and then at an analyzer to reject that same excitation frequency but pass a particular emission frequency.
18.
This may not be possible and for this reasons when groups of people are to walk along a bridge, for example a group of soldiers, the recommendation is that they break their step to avoid possibly significant excitation frequencies.
19.
The lack of a natural excitation frequency has led to the use of double pendulum systems in seismic resistance designs in buildings, where the building itself is the primary inverted pendulum, and a secondary mass is connected to complete the double pendulum.
20.
When optimally designed within a given core saturation constraint and for a given active current ( i . e ., torque current ), voltage, pole-pair number, excitation frequency ( i . e ., synchronous speed ), and air-gap flux density, all categories of electric motors or generators will exhibit virtually the same maximum continuous shaft torque ( i . e ., operating torque ) within a given air-gap area with winding slots and back-iron depth, which determines the physical size of electromagnetic core.
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