2] represent the amplitudes of the harmonic waves
and h is the thickness of the test specimen.
A 2nd harmonic wave
is twice the frequency of the transmitted frequency.
Relatively small amplitude of the harmonic waves
reduces the detection of echoes from multiple scattering events and side lobe artifacts are less likely to occur in THI.
To proceed to studying the problem of non- harmonic wave
packets evolution in a smoothly non- uniform horizontally and non-stationary stratified medium we presuppose the choice of Anzatz ("Anzatz" is the German for a solution type), which define the propagation of Airy and Fresnel internal waves withcertain heuristic arguments.
It's very useful to analyze and suppress wind farms harmonic waves
In addition to the traditional problems of interference of coherent harmonic waves
the interference of pulses is also considered.
In order to evaluate the quality of single data points, oscillatory raw data can be analysed by Lissajous figures and higher harmonic waves
The actuators are driven in a closed feed forward control loop, which means that multiple order harmonic waves
are cancelled even when engine speeds change very quickly.
This phenomenon could be described similarly to a sum of two or more harmonic waves
having nearly equal frequencies.