The phrase "a usual method" is correct and usable in written English.
It can be used as a noun phrase to describe a common or typical way of doing something. Example: "Using flashcards is a usual method for memorizing vocabulary words."
Analysis of fault-related vibration signal is a usual method for accurate diagnosis.
Viscoelastic approach is a usual method and has only achieved limited success.
Detection sensor is a usual method to alarm the formation of potentially explosive mixtures of H2 in air ambient and therefore to prevent the risk of explosions and fires [10, 11, 12].
This is difficult to interpret and not a usual method to assess reliability.
TUNEL assay is always considered a usual method to detect apoptotic cells [ 23- 25].
To evaluate ranking performance in comparison with the control rank, discounted cumulative gain (DCG), a usual method to measure effectiveness of a web search engine algorithm, is used for evaluating performance of ranking.
In medium to large scale wind energy conversion systems (WECS), the control of the pitch angle of the blades is an usual method for power regulation above rated wind speed.
The underlying dimensions of the scale were checked with an explanatory factor analysis using a Varimax rotation and Principal Components Method as a usual descriptive method for analyzing grouped data [ 20].
Under the agreement, the janitors can join a union not through the usual method -- a contentious, long election -- but as soon as a majority of janitors at a work site sign cards saying they want to join.
Both have also sued or threatened to sue Chinese media outlets for libel, a novelty in a country where the usual method of dealing with harmful allegations in the media is bribing journalists to shut up.
This technique, known as transit timing variations (TTV), is a departure from the usual method, in which astronomers measure the wobbles a planet's gravity induces in its parent star.
