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shengjunjie

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ÆäÖÐC1=0.08£»C2=2.3£»e=0.3*(sin(335*t))^2
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dbb627

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shengjunjie: ½ð±Ò+10, ¡ï¡ï¡ïºÜÓаïÖú 2012-04-17 09:35:06
³ôË®¹µ: ½ð±Ò+1, лл½»Á÷~~ 2012-04-17 10:11:24
ÒýÓûØÌû:
5Â¥: Originally posted by shengjunjie at 2012-04-16 20:54:38:
»­³öÀ´ÁË£¬ÈçÏÂͼ£¬ÄãºÃ£¬ÄÜ·ñ´Í½ÌÈçºÎ»­Õñ·ù£¬»¹ÓУ¬ÎÒ¸ÃÈçºÎ¸øÄãÔùËͽð±ÒÄØ
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The more you learn, the more you know, the more you know, and the more you forget. The more you forget, the less you know. So why bother to learn.
6Â¥2012-04-16 20:56:55
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dbb627

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³ôË®¹µ: ½ð±Ò+2, лл½»Á÷~~ 2012-04-16 15:55:10
ÐèÒª¸ø³õÖµÌõ¼þ
¼ÙÉè¦Ë£¨0£©=0.1 Ò»½×µ¼³õֵΪ0.01£¬
odefun=@(t,x)[x(2);3*x(2)./(2*x(1)*(1+0.08*x(1).^3))-2.3*(x(1).^4-x(1)+0.3*(sin(335*t)).^2)./(1+0.08*x(1).^3)];
[t,x]=ode45(odefun,[0 1],[0.1 0.01]);
plot(t,x(:,1))
The more you learn, the more you know, the more you know, and the more you forget. The more you forget, the less you know. So why bother to learn.
2Â¥2012-04-16 15:02:28
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

shengjunjie

ľ³æ (ÕýʽдÊÖ)

ÒýÓûØÌû:
2Â¥: Originally posted by dbb627 at 2012-04-16 15:02:28:
ÐèÒª¸ø³õÖµÌõ¼þ
¼ÙÉè¦Ë£¨0£©=0.1 Ò»½×µ¼³õֵΪ0.01£¬
odefun=@(t,x);
=ode45(odefun,,);
plot(t,x(:,1))

·Ç³£¸Ðл¡£ÄãºÃ£¬ÎÒ½ñÌìÏÂÎçÓÃÁËÒ»¸öÀàËÆµÄ·½·¨¼ÆËã³öÀ´ÁË¡£Íü¼Çд³õʼÌõ¼þÁË£¬¦Ë£¨0£©=1£¬¦Ë£¨0£©µÄµ¼ÊýΪ0.
ÄãÖªµÀÔõô¸ù¾ÝÕâ¸ö·½³ÌÇóÕñ·ù²»£ºÆäÖÐC1=0.08£»C2=1.342*10^7£»e=9.23*(sin(2*pi*f*t))^2.
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3Â¥2012-04-16 20:34:29
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shengjunjie

ľ³æ (ÕýʽдÊÖ)

ÒýÓûØÌû:
2Â¥: Originally posted by dbb627 at 2012-04-16 15:02:28:
ÐèÒª¸ø³õÖµÌõ¼þ
¼ÙÉè¦Ë£¨0£©=0.1 Ò»½×µ¼³õֵΪ0.01£¬
odefun=@(t,x);
=ode45(odefun,,);
plot(t,x(:,1))

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4Â¥2012-04-16 20:43:50
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shengjunjie

ľ³æ (ÕýʽдÊÖ)

ÒýÓûØÌû:
2Â¥: Originally posted by dbb627 at 2012-04-16 15:02:28:
ÐèÒª¸ø³õÖµÌõ¼þ
¼ÙÉè¦Ë£¨0£©=0.1 Ò»½×µ¼³õֵΪ0.01£¬
odefun=@(t,x);
=ode45(odefun,,);
plot(t,x(:,1))

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5Â¥2012-04-16 20:54:38
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shengjunjie

ľ³æ (ÕýʽдÊÖ)

ÒýÓûØÌû:
6Â¥: Originally posted by dbb627 at 2012-04-16 20:56:55:
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ÄãºÃ£¬¸ÃÈçºÎ×ö¸µÀïÒ¶±ä»»£¬Ö±½ÓÕë¶ÔÇó³öµÄlambda£¬»¹ÊÇÔõôÑù£¬ÄÜ·ñ¸ø¸ö»ù±¾µÄ³ÌÐò£¬¸ÐлÀ²
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7Â¥2012-04-17 09:36:54
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

dbb627

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shengjunjie: ½ð±Ò+10, ¡ï¡ï¡ïºÜÓаïÖú 2012-04-17 10:23:04
xiegangmai: ½ð±Ò+1, лл²ÎÓ룡 2012-04-17 12:48:56
ÒýÓûØÌû:
5Â¥: Originally posted by shengjunjie at 2012-04-16 20:54:38:
»­³öÀ´ÁË£¬ÈçÏÂͼ£¬ÄãºÃ£¬ÄÜ·ñ´Í½ÌÈçºÎ»­Õñ·ù£¬»¹ÓУ¬ÎÒ¸ÃÈçºÎ¸øÄãÔùËͽð±ÒÄØ
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µÃµ½Êý¾Ýºó£¬ÎÒ¿ÉÒÔ¸øÄã×öÏÂfourier·ÖÎö
The more you learn, the more you know, the more you know, and the more you forget. The more you forget, the less you know. So why bother to learn.
8Â¥2012-04-17 10:16:54
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

shengjunjie

ľ³æ (ÕýʽдÊÖ)

ÒýÓûØÌû:
6Â¥: Originally posted by dbb627 at 2012-04-16 20:56:55:
×öϸµÁ¢Ò¶±ä»¯»­³ö·ùƵÇúÏßÇóÏàӦƵÂʵÄÕñ·ù

ÄãºÃ£¬ÕâÑù±à³Ì¶Ô²»¶Ô
%ÆäÖÐlambda£¨0£©=1£¬D£¨lambda£¨0£©£©=0
odefun=@(t,x)[x(2);3*x(2).^2/(2*x(1)*(1+0.08*x(1).^3))-1.342*10^7*(x(1).^4-x(1)+(61.98/6.71)*(0.185*sin(2*pi*335*t)).^2)./(1+0.08*x(1).^3)];
[t,x]=ode45(odefun,[0 0.06],[1 0]);% ×Ô±äÁ¿µÄ·¶Î§ºÍ³õʼֵ
figure(1);
plot(t,x(:,1))
figure(2);
y=fft(x(:,1));
plot(abs(y)); % »­·ùƵÇúÏß
figure(3);
plot(angle(y)); % »­ÏàÆµÇúÏß

ÔÚÄãµÄ»ù´¡ÉÏÖ±½Ó¼ÓÁËÕâ¾ä»°£¬
figure(2);
y=fft(x(:,1));
plot(abs(y)); % »­·ùƵÇúÏß
figure(3);
plot(angle(y)); % »­ÏàÆµÇúÏß

ÕâÑùµÄ½á¹ûºÃÏñ²»¶Ô
µ«ÊǺ¯ÊýÖеÄ2*pi*f=335Êǹ̶¨µÄ
ºÃºÃѧϰ£¬¶àÔ˶¯£¬¶à·¢Paper...
9Â¥2012-04-17 10:21:20
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

shengjunjie

ľ³æ (ÕýʽдÊÖ)

ÒýÓûØÌû:
8Â¥: Originally posted by dbb627 at 2012-04-17 10:16:54:
°ÑÄã»­Õâ¸öͼµÄ´úÂ룬Ìùһϣ¬ÓÉÓÚÄãµÄÌõ¼þûÓиøf£¬ÎÒ»­²»³öÕâÑùµÄͼ
µÃµ½Êý¾Ýºó£¬ÎÒ¿ÉÒÔ¸øÄã×öÏÂfourier·ÖÎö

ƵÂÊfµÄ·¶Î§ÊÇ0-1000hz
ºÃºÃѧϰ£¬¶àÔ˶¯£¬¶à·¢Paper...
10Â¥2012-04-17 10:22:37
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
Ïà¹Ø°æ¿éÌø×ª ÎÒÒª¶©ÔÄÂ¥Ö÷ shengjunjie µÄÖ÷Ìâ¸üÐÂ
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