A phugoid lossis fugoid /ˈfjuːɡɔɪd/ is ib lub dav hlau txav uas lub tsheb nce thiab nce, thiab tom qab ntawd pitches thiab nqis, nrog rau kev nrawm thiab qeeb raws li nws mus "downhill" thiab "uphill".
Phugoid oscillation yog dab tsi?
Lub phugoid lossis lub sijhawm ntev yog tus yam ntxwv oscillations ntawm lub dav hlau tom qab muaj kev cuam tshuam me me ntawm lub davhlau tsis tu ncua (ie. vim me me kab rov tav tswj qhov txav los yog huab cua gust). Lub dav hlau tab tom taug kev raws lub sinusoidal trajectory nrog me me hloov ntawm huab cua ceev thiab suab lub kaum sab xis.
Ntev ntev phugoid yog dab tsi?
Longitudinal Dynamics
hom phugoid feem ntau yog maj mam damped low-frequency oscillation nyob rau hauv ceev u, uas khub niam txiv mus rau hauv pitch cwj pwm θ thiab qhov siab h. Ib qho tseem ceeb ntawm hom no yog qhov xwm txheej α(w) tseem nyob tas li thaum muaj kev cuam tshuam.
kav hom hauv dav hlau yog dab tsi?
hom kauv yog feem ntau zoo siab los ntawm kev cuam tshuam ntawm sab hauv, uas feem ntau ua raws li kev cuam tshuam hauv yob thiab ua rau lub tis poob. Xav tias lub dav hlau yog thawj zaug nyob rau hauv trimmed tis theem davhlau thiab hais tias ib tug cuam tshuam ua rau ib tug me me zoo yob lub kaum sab xis ϕ los txhim kho.
Dab tsi yog qhov txawv ntawm qhov zoo li qub thiab kev ruaj ntseg zoo?
Qhov tseem ceeb, kev ruaj ntseg ruaj khov yog ntsuas kev ruaj khov nyob rau lub sijhawm. Staticstability tsis tau txais imply dynamic stability, txawm hais tias lub dav hlau tsis ruaj khov tsis tuaj yeem ua kom ruaj khov. Kev ruaj ntseg yog txiav txim siab rau cov ntaub nplaum nplaum thiab tsis muaj nplaum.
