'in a constant cycle' is a correct and usable phrase in written English.
You can use it when referring to a situation that is repetitive, continuous, and ongoing. For example: "Traffic in the city moves in a constant cycle throughout the day."
"It appears as though the Egyptian judicial system seems intent on 'losing' him in the system by detaining him in a constant cycle, without the need to produce a shred of evidence to support their accusations".
Torres's weird tale, censored for more than 50 years, plays round and round as a strip of black audiotape loops through two reel-to-reel decks, recording and then erasing the interview, in a constant cycle of forgetting and remembering.
Size's genius for musical drama is still intact, and Brown Paper Bag is his masterpiece: an essay in hyperkinetic pace, it piles up teetering stacks of instrumental layers, their cumulative weight triggering each step in a constant cycle of demolition and reconstruction of its latticework of melody, rhythm and mood.
That "Beyond Scared Straight" did so well for A&E makes sense, because it encapsulates the network's prime-time strategy: to drag the viewer past scenes of criminality, addiction, obsession and depression, in a constant cycle of there but for the grace of reality TV go we.
A special cleaning-head keeps the water used for cleaning in a constant cycle.
While placing us in a constant cycle of anxiety, and even depression.
Hugo Chavez's successful change of the Venezuelan constitution in 1999 was followed by a constant cycle of national elections -- one a year on average.
If applied to more areas of Google's search algorithm, eventually the software could "learn" to update itself with little to no human interference, resulting in a self-modifying app on a constant cycle of improvement.
Mice were kept at the animal facility of the Department of Neurology, University of Wuerzburg, under barrier conditions and at a constant cycle of 12 h in the light (< 300 lux) and 12 h in the dark.
He stayed for seven years in a seemingly constant cycle of brilliance and truculence, never managing more than 15 starts in a season, while never quite being bad enough to kill the suspicion that he could be superb if only he could get his head together.
Subsequently, the Assiniboin and Dakota engaged in an almost constant cycle of raiding and defense; as a result, the Assiniboin formed an alliance with the Cree, who joined the tribe in activities against the Dakota.
