The phrase "supplementary function" is correct and usable in written English.
You can use it when referring to an additional task that is needed in order to supplement a primary action or activity. For example, "We added a supplementary function to the software to better suit our needs."
A supplementary function of Excitation Control Systems (ECSs) for synchronous generators is that of a Power System Stabilizer (PSS).
The program has a supplementary function designed to correct ambient effects in the time series by referring to concurrently observed data (Ishiguro et al., 1984; Tamura et al., 1991).
Overall, CHD-FA was shown to possess broad-spectrum antibacterial activity, with a supplementary function of being able to down-regulate inflammation.
Only a subset of strains showed CRISPR/Cas bacteriophage resistance systems of different subtypes, suggesting a supplementary function in maintenance of chromosomal stability.
Comparison of single and sultr4;1/ sultr4;2 double knock-out mutants suggested that Sultr4;1 plays a major role and Sultr4;2 has a supplementary function [ 21].
Supplementary functions for Gaussian basis sets.
Displacement functions are assumed as a superposition of Fourier cosine series and two types of supplementary functions.
Other devices, such as springs, flywheels, shafts, and fasteners, perform supplementary functions.
Under the framework, the displacement and sound pressure admissible functions are generally set, no relations to boundary conditions, to the combinations of Fourier cosine series and supplementary functions which can eliminate the discontinuous or jumping phenomenon in the boundaries.
The use of these supplementary functions is to overcome the discontinuity problems which the original displacement functions will potentially encounter along the edges when they are viewed as a periodic function defined over the entire x y plane.
Regardless of boundary conditions, each displacement and rotation component of the structures is invariantly expressed as the superposition of a Fourier cosine series and two supplementary functions introduced to remove any potential discontinuous of the original displacements and their derivatives.
