Periodicity of shutdowns for measurements during the testing of machines and mechanisms

Conclusions

• 1. The values of a parameter measured during the time of short-term shutdowns of an operating object differ from the values acquired for the checked parameter at those points along the time axis during continnuous operation of the object. This divergence, especially noticeable in the final part of a test—in a zone close to temperature stabilization, increases with a decrease of the interval and an increase of the duration of the shutdowns for measurements.

• 2. In making measurements during shutdown time at an interval equal to a given measurement interval, as a result of tests one must introduce corrections determined from (3).

• 3. A varying periodicity of shutdowns for measurements having an interval selected in accordance with (4) permits us to use directly measured values of a parameter without making any corrections to them.

• 4. In computing the average value of several measurements of a parameter during shutdown time one must, using (5), take into account the relative shift of measurements with time. Such corrections must be introduced during simultaneous investigation of the change of several mutually connected parameters the measurements of which cannot be made simultaneously.