( ( ( ( ( ( Electrical ( inertia simulation ) ) , ) or ) ( ( ( a combination ) ( of ( electrical ( and ( mechanical simulation ) ) ) ) ) ( may ( be ( used ( in ( lieu ( of ( mechanical flywheels ) ) ) ) ) ) ) ) ) , ) ( ( provided ( that ( ( ( the performance ) ( of ( the ( electrically ( simulated inertia ) ) ) ) ) ( complies ( with ( the ( following specifications ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJ Electrical) (NN inertia) (NN simulation)) (, ,) (CC or) (NP (NP (DT a) (NN combination)) (PP (IN of) (NP (JJ electrical) (CC and) (JJ mechanical) (NN simulation))) (SBAR (S (VP (MD may) (VP (VB be) (VP (VBN used) (PP (IN in) (NP (NP (NN lieu)) (PP (IN of) (NP (JJ mechanical) (NNS flywheels))))))))))) (, ,)) (VP (VBD provided) (SBAR (IN that) (S (NP (NP (DT the) (NN performance)) (PP (IN of) (NP (DT the) (JJ electrically) (JJ simulated) (NN inertia)))) (VP (VBZ complies) (PP (IN with) (NP (DT the) (VBG following) (NNS specifications))))))) (. .)))
Electrical inertia simulation, or a combination of electrical and mechanical simulation may be used in lieu of mechanical flywheels, provided that the performance of the electrically simulated inertia complies with the following specifications.
(ROOT (S (NP (NNS Centrifuges)) (VP (VBP use) (NP (NN inertia)) (S (VP (TO to) (VP (VB perform) (NP (PRP$ their) (NN task)))))) (. .)))