µÚÈýÕ ϰ Ì⣨P90£©
½â£º
S£½S1S2S3=80nc/MPa¡Á0.005V/nc¡Á25mm/V=10 mm/ MPa ¡÷P=¡÷x/S=30mm/10(mm/ MPa)=3 MPa
½â£º
S£½S1S2=404¡Á10-4Pc/Pa¡Á0.226mV/Pc=9.13¡Á10-3mV/Pa
10?106mV/Pa8
S2=S/S1== 2.48¡Á10mV/Pc -4404?10Pc/Pa
½â: ?=2s, T=150s, ?=2¦Ð/T
300£0.9965¡Á100=200.35¡æ 300£«0.9965¡Á100=399.65¡æ ¹Êζȱ仯·¶Î§ÔÚ200.35~399.65¡æ.
A(?)?11?(??)2?11?(4?/150)2?0.9965
½â: ?=15s, T=30/5=6s, ?=2¦Ð/T
A(?)?11?(??)2?11?(15?2?/6)2?0.0635h¸ß¶È´¦µÄʵ¼ÊζÈt=t0-h*0.15/30
¶øÔÚh¸ß¶È´¦Î¶ȼÆËù¼Ç¼µÄζÈt¡®£½A(?)t£½A(?)£¨t0-h*0.15/30£© ÓÉÓÚÔÚ3000m¸ß¶ÈζȼÆËù¼Ç¼µÄζÈΪ£1¡æ£¬ËùÒÔÓÐ
£1= A(?)£¨t0-3000*0.15/30£© ÇóµÃ t0=£0.75¡æ
µ±Êµ¼ÊζÈΪt£½£1¡æÊ±£¬ÆäÕæÊµ¸ß¶È¿ÉÓÉÏÂʽÇóµÃ£º
t=t0-h*0.15/30£¬h=(t0- t)/0.005=(-0.75+1)/0.005=50m
½â£º (1)
?A(?)?1?A(?)?1?11?(??)2?1?11?(100?2??)2?10%
Ôò ?¡Ü7.71¡Á10£4 S (2)
?A(?)?1?A(?)?1?11?(??)2?1?11?(50?2??7.71?10)?42?2.81%?(?)= ?arctg?? = -arctg£¨50?2??7.71?10?4£©= £13.62¡ã
½â£º?£½0.04 S£¬
?A(?)?1?A(?)?1?11?(??)2?1?11?(2?f?)2£¨1£©µ±f=0.5Hzʱ£¬
?A(?)?1?A(?)?1?11?(??)11?(??)11?(??)222?1?11?(2??0.5?0.04)11?(2??1?0.04)11?(2??2?0.04)222?0.78%£¨2£©µ±f=1Hzʱ£¬
?A(?)?1?A(?)?1??1??3.02%£¨3£©µ±f=2Hzʱ£¬
?A(?)?1?A(?)?1??1??10.65%
½â£º?£½0.0025 S
?A(?)?1?A(?)?1?11?(??)2?1?11?(0.0025?)2?5%Ôò ?£¼131.5£¨»¡¶È/s£© »ò f£¼?/2¦Ð£½20.9 Hz Ïàλ²î£º?(?)= ?arctg?? = -arctg(131.5?0.0025) = £18.20¡ã
½â£ºfn=800Hz, ?=0.14, f=400 ??n?f/fn?400/800?0.5
?A(?)?H(?)?11?1??????2n2?4?2???n??1.312?1?0.5?22?4?0.142??0.5?2?(?)??arctg2???n2?0.14?0.5???arctg??10.5721?0.521????n?µÚËÄÕ ϰ Ì⣨P127£©
4£9
½â£º ÓÉ µÃ
S??CC0??0A??2???0?0?C????0A?122?62????1?8.85?10???4?(?1?10)/0.3?02??4.94?10?15(F)??4.94?10?3(PF)±ä»¯¸ñÊý¡¡¡¡S1S2?C?100?5?(?4.94?10?3)??2.47(¸ñ)
4£10
½â£º
Q Ca Ra Cc Ri Ci
U0?
QQ?CCa?Cc1
Ca?CcÓÉSu=U0/a , Sq=Q/a µÃ£ºSu/ Sq =U0/Q=