Mechanics of Vibration-东南大学中国大学mooc课后章节答案期末考试题库2023年

MechanicsofVibration_东南大学中国大学mooc课后章节答案期末考试题库2023年Whenatwo-degree-of-freedomsystemissubjectedtoaharmonicforce,thesystemvibratesatthe()?

参考答案:

frequencyofappliedforce

Thephenomenonof_____canoccurwhentheforcingfrequencyisclosetothenaturalfrequencyofthesystem.

参考答案:

resonance

Atwo-degree-of-freedomsystemhas()?

参考答案:

twonormalmodes

Theequationsofmotionofatwo-degree-of-freedomsystemareingeneralintheformof()?

参考答案:

coupleddifferentialequations

Themagnificationfactorisalsoknownas_____factor.

参考答案:

amplification

Theequationsofmotionofasystemwillbe_____whenprincipalcoordinatesareused?

参考答案:

uncoupled

Thenumberofdegreesoffreedomofavibratingsystemdependson()?

参考答案:

numberofcoordinatesusedtodescribethepositionofeachmass

Thetheoreticalbasisofusingenergymethodtofindthenaturalfrequencyofthesystemis().

参考答案:

Lawofconservationof

mechanicalenergy

Forthefollowingfreevibrationsystem,whichonedecaysthefastest().

参考答案:

Criticaldampingsystem

Fordiscretesystem,thegoverningequationsaredifferentialequations.

参考答案:

ordinary

Inproportionaldamping,thedampingmatrixisassumedtobealinearcombinationofthe_____and_____matrices.

参考答案:

mass,stiffness

The_____analysisisbasedontheexpansiontheorem.

参考答案:

modal

Thestiffnessandflexibilitymatricesarerelatedas()?

参考答案:

[k]

=

[a]-1

Bothboundaryandconditionsaretobespecifiedtofindthesolutionofavibratingcontinuoussystem.

参考答案:

initial

Themaximumaccelerationofthesimplifiedharmonicvibrationofaspringmasssystemisa,andthenaturalfrequencyofthesystemisω.Whatisthemaximumvelocityofthesystem?()

参考答案:

a/ω

Animpulseforcehasalargemagnitudeandactsforavery_____periodoftime.

参考答案:

short

Thenumberofnaturalfrequenciesofacontinuoussystemis

参考答案:

infinite

Theresponseofanundampedsystemunderresonancewillbe()?

参考答案:

infinity

Ifasystemissubjectedtoasuddenlyappliednonperiodicforce,theresponsewillbe_______?

参考答案:

transient

Anynonperiodicfunctioncanberepresentedbya_____integral.

参考答案:

convolution

Thecompletesolutionofavibrationproblemiscomposedofthe_____stateandtransientsolutions.

参考答案:

steady

Theamplitudeofanundampedsystemvarieswithtime.()

参考答案:

正确

Thefree-vibrationequationofastringisalsocalledaequation

参考答案:

wave

Stiffnessincreaseswhenthenaturalfrequency();Themassincreaseswhenthenaturalfrequency().

参考答案:

decrease

increase

Thefrequencyofbeatingis()?

参考答案:

ωn-ω

Thecompl