Mechanics of Vibration-東南大學(xué)中國大學(xué)mooc課后章節(jié)答案期末考試題庫2023年

MechanicsofVibration_東南大學(xué)中國大學(xué)mooc課后章節(jié)答案期末考試題庫2023年Whenatwo-degree-of-freedomsystemissubjectedtoaharmonicforce,thesystemvibratesatthe()?

參考答案:

frequencyofappliedforce

Thephenomenonof_____canoccurwhentheforcingfrequencyisclosetothenaturalfrequencyofthesystem.

參考答案:

resonance

Atwo-degree-of-freedomsystemhas()?

參考答案:

twonormalmodes

Theequationsofmotionofatwo-degree-of-freedomsystemareingeneralintheformof()?

參考答案:

coupleddifferentialequations

Themagnificationfactorisalsoknownas_____factor.

參考答案:

amplification

Theequationsofmotionofasystemwillbe_____whenprincipalcoordinatesareused?

參考答案:

uncoupled

Thenumberofdegreesoffreedomofavibratingsystemdependson()?

參考答案:

numberofcoordinatesusedtodescribethepositionofeachmass

Thetheoreticalbasisofusingenergymethodtofindthenaturalfrequencyofthesystemis().

參考答案:

Lawofconservationof

mechanicalenergy

Forthefollowingfreevibrationsystem,whichonedecaysthefastest().

參考答案:

Criticaldampingsystem

Fordiscretesystem,thegoverningequationsaredifferentialequations.

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ordinary

Inproportionaldamping,thedampingmatrixisassumedtobealinearcombinationofthe_____and_____matrices.

參考答案:

mass,stiffness

The_____analysisisbasedontheexpansiontheorem.

參考答案:

modal

Thestiffnessandflexibilitymatricesarerelatedas()?

參考答案:

[k]

=

[a]-1

Bothboundaryandconditionsaretobespecifiedtofindthesolutionofavibratingcontinuoussystem.

參考答案:

initial

Themaximumaccelerationofthesimplifiedharmonicvibrationofaspringmasssystemisa,andthenaturalfrequencyofthesystemisω.Whatisthemaximumvelocityofthesystem?()

參考答案:

a/ω

Animpulseforcehasalargemagnitudeandactsforavery_____periodoftime.

參考答案:

short

Thenumberofnaturalfrequenciesofacontinuoussystemis

參考答案:

infinite

Theresponseofanundampedsystemunderresonancewillbe()?

參考答案:

infinity

Ifasystemissubjectedtoasuddenlyappliednonperiodicforce,theresponsewillbe_______?

參考答案:

transient

Anynonperiodicfunctioncanberepresentedbya_____integral.

參考答案:

convolution

Thecompletesolutionofavibrationproblemiscomposedofthe_____stateandtransientsolutions.

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steady

Theamplitudeofanundampedsystemvarieswithtime.()

參考答案:

正確

Thefree-vibrationequationofastringisalsocalledaequation

參考答案:

wave

Stiffnessincreaseswhenthenaturalfrequency();Themassincreaseswhenthenaturalfrequency().

參考答案:

decrease

increase

Thefrequencyofbeatingis()?

參考答案:

ωn-ω

Thecompl