"periodic fluctuation" is a correct and usable phrase in written English.
You can use it to refer to variations or changes that occur at regular intervals or according to a pattern. For example: "The stock market is known for its periodic fluctuations over time."
Although only a case with a periodic fluctuation with the period T = 5 is analyzed in this paper, the results are reproduced over a wide range of the period.
A periodic fluctuation of the density and stiffness parameters is considered, where the period is related to the characteristic element size of the mesh.
The excitation of the belt-drive system is derived from periodic fluctuation of the driving pulley.
In case of sample N2 and N3, it is found that water quality characteristics show consistent periodic fluctuation.
Choosakul et al. (2009) reported a periodic fluctuation of TEC measured by GPS receivers after the Sumatra 2004 earthquake.
Lattice resistance to shear slip is caused by the periodic fluctuation of the misfit energy across a slip plane.
We start the analysis with the non-fluctuating condition, which corresponds to the situations before the periodic fluctuations are added in the three simulations in Fig. 2. We show that there is the only one fittest genotype based on the evolutionary invasion analysis, which is, in this non-fluctuating condition, also called the R* rule [16].
Business cycle, periodic fluctuations in the general rate of economic activity, as measured by the levels of employment, prices, and production.
But others say that periodic fluctuations in magma volume can also help make the abyssal hills.
Similar periodic fluctuations were observed in the bath pressure measurements.
Intertidal marine systems are highly dynamic systems which are characterized by periodic fluctuations in environmental parameters.
