Page 94 - index
P. 94
ɋɨԙԑɵ ɬɟԙɞɿɤɬɟɧ ɤԧɪɿɧɿɩ ɬԝɪԑɚɧɞɚɣ, ɧԛɤɬɟɧɿԙ ɬɪɚɟɤɬɨɪɢɹɫɵ ɲɟԙɛɟɪ ɛɨɥɵɩ
ɲɵԕɬɵ. Ȼԝɥ ɲɟԙɛɟɪɞɿԙ ɰɟɧɬɪɿ ɤɨɨɪɞɢɧɚɬɚ ɛɚɫɵɧɞɚ ɠɚɬɚɞɵ ɠԥɧɟ ɨɧɵԙ
ɪɚɞɢɭɫɵ b -ԑɚ ɬɟԙ (13ɚ-ɫɭɪɟɬ).
13-ɫɭɪɟɬ
2. ɇԛɤɬɟɧɿԙ ɭɚԕɵɬɬɵԙ t ɤɟɡɿɧɟ ɫԥɣɤɟɫ ɠɵɥɞɚɦɞɵԑɵɧ ɚɧɵԕɬɚɣɵԕ.
Ⱥɥɞɵɦɟɧ ɠɵɥɞɚɦɞɵԕɬɵԙ ɦɨɞɭɥɿɧ ɬɚɛɚɣɵԕ.
Qx dx bk sin ktcɦ / ɫ , Q y dy bk cos ktcɦ / ɫ .
dt dt
v ¨§ dx ¸· 2 §¨ dy ¸· 2 bkɫk / ɫ .
© dt ¹ © dt ¹
ɀɵɥɞɚɦɞɵԕɬɵԙ ɦɨɞɭɥɿ ɦɟɧ ɛɚԑɵɬɵɧ ɚɧɵԕɬɚɣɵԕ:
D oo S kt , oo 1 dx sin kt cos§¨ S kt ·¸ .
2 v dt © 2 ¹
(v, i ) cos(v, i )
Ԧɪɧɟɤɬɟɪɞɟɧ ɤԧɪɿɧɿɩ ɬԝɪԑɚɧɞɚɣ, ɠɵɥɞɚɦɞɵԕ ɦɨɞɭɥɿ ɛɨɣɵɧɲɚ ɬԝɪɚԕɬɵ
ɛɨɥɵɩ ɲɵԕɬɵ, ɞɟɦɟɤ, ɧԛɤɬɟ ɲɟԙɛɟɪ ɛɨɣɵɦɟɧ ɛɿɪԕɚɥɵɩɬɵ ԕɨɡԑɚɥɵɫɬɚ
ɛɨɥɚɞɵ. ɀɵɥɞɚɦɞɵԕɬɵԙ ɜɟɤɬɨɪɵ ɈɆ ɪɚɞɢɭɫɵɧɚ ɩɟɪɩɟɧɞɢɤɭɥɹɪ ɠԥɧɟ
ɲɟԙɛɟɪɝɟ ɠɚɧɚɦɚɦɟɧ ɛɚԑɵɬɬɚɥԑɚɧ; ɠɵɥɞɚɦɞɵԕ ɩɟɧ Ox ɨɫɿɧɿԙ ɚɪɚɫɵɧɞɚԑɵ
ɛԝɪɵɲ D oo S kt (13 Ω-ɫɭɪɟɬ).
2
(v, i )
3. ɇԛɤɬɟɧɿԙ ɭɚԕɵɬɬɵԙ t ɤɟɡɿɧɟ ɫԥɣɤɟɫ ԛɞɟɭɿɧ ɚɧɵԕɬɚɣɵԕ. Ⱥɥɞɵɦɟɧ ɛɟɥɝɿɥɿ
ɮɨɪɦɭɥɚɥɚɪɞɵ ɩɚɣɞɚɥɚɧɵɩ, ԛɞɟɭɥɟɪɞɿ ɬɚɛɚɦɵɡ. ɋɨɞɚɧ ɤɟɣɿɧ, ɦɨɞɭɥɶɞɿ ɠԥɧɟ
ɛɚԑɵɬɬɚɭɲɵ ɤɨɫɢɧɭɫɬɚɪɞɵ ɬɚɛɚɦɵɡ. Ɉɥɚɪ:
ax d2x bk 2 cos ktɫt / ɫ 2 , ay d2y bk 2 sin ktɫt / ɫ 2 ,
dt 2 dt 2
a §¨©¨ d2x ·¹¸¸ §¨¨© d2 y ¸¸·¹ bk 2ɫɦ / ɫ 2 .
dt 2 dt
2
oo 1 d2 x cos kt cosS kt, oo
a dt
cos(a, i ) 2 E (a, i ) S kt .
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