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卫星
tv
天线
设计
- 资源描述：
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该方案是船载卫星TV天线座设计，舰载卫星TV天线座是天线的支撑与旋转的机械装置，其功能是在舰艇摇摆条件下，补偿舰体运动引起的纵、横摇摆角，使天线保持水平，并以恒定转速驱动天线旋转，完成舷角机构扫描，并输出舷角信号。天线座支架设在船甲板上对其强度、刚度有较高的要求，同时要求耐冲击、振动，而且谐振频率要满足伺服系统带宽的需要。在船上设置卫星TV天线座帮助那些长期需要在船上工作的人以及出海游玩的人可以随时随地的收看到各种电视节目，解决长期在船上无法收看电视而带来的苦闷，让人们能有好的心情。并且还可以通过舰载卫星TV天线及时了解海上的天气情况，避免一些恶虐的天气。
原理简述：对于天线座的俯仰转动部分由步进电机带动行星摆线针轮减速器，此级传动比为i=17，小齿轮与减速器通过键连接，大扇形齿轮固定在上支架上，此级传动比i=3，通过电机的转动带动天线俯仰转动，天线是通过螺栓与俯仰轴固定在一体，传动范围为15°—90°。方位轴的驱动系统是110BYG5-04步进电机，带动减速器，大小齿轮，从而使方位轴转动，其转动范围大于360°。下支架开有调速孔，以便消除齿轮的齿侧间隙，减少传动中的误差。在方位轴上转上传感器，把方位轴转角的度数以电信号输出，以反映天线的运动规律及轴的方位角。当方位轴转动极限位置时，检测装置会通过输出信号来控制系统，使电机制动或反转。在整个座架的外面有做防护和密封的铁皮罩，铁皮罩可以拆卸，而且在其上面开有通风装置。整个防护装置的框架用角铁焊接在一起。防护罩的上箱盖做成活动的两块，便于拆卸和维修方便。当防护罩与联接头连接时，既要不互相摩擦，又要防止水进入防护罩内，另外在天线支架的底板上的两边应转有平衡块，使俯仰转动部分尽可能达到静平衡，以减少不平衡力矩，减轻电机的负载。
- 内容简介：
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本科毕业设计论文 专业名称： 机械设计制造及其自动化 学生姓名： 杨 方 元 指导教师： 张 永 红 毕业时间： 2014 年 6 月 1 目录 F . 2 . 3 . 5 . 7 . 8 . 10 N . 12 天线的性能 . 13 . 14 益 . 15 . 17 . 18 . 20 . 21 2 英文原文： F ne to an a of s we a of we on of is or if to on of to We of to It is to of to In is to as in a in it we to to as in an or in a or of a we or An by s or an it in to by of a , a ()j kR , k, is /. is of by c/f , c is of 3 3 810 m/s in f is of a to on a as as is s 80of As in of by no in In is on We by to in a on At be by of of It is of is : S = E H* W/ 2m to of H* is of is to in of , of = 2W/ 2m ( is of it is to a (E, H, S). a of on , 1/ 2R , 1/ 3R , so be , 1/ 3R , 4 on is on (1/R 2R a to of on of or At to we is 221 1 , 2 2 ,44a v g a v R Sis ; no in in it of is in a is , E is (, ) = S(R, , ) 2R W/on of at A by in a ) of is of ) or ). = 0 = 90on it is to to on by (1) (2) 5 3) dB is it of .1 of is in a is to a a on of is a of of to in a is at by an o at a : S = 2R . An in is by by of 2R . is to 00% of an in of 2024 014(is by of In is as of 02,4 0 , 4 ( 6 of by o is a of by or 2000, s i r is in or to In in we of we We by a it is by In a or a to a to 7 be by of is a or is to be of 0 km of an an W a 5 dB to a G = 151010 = 0 km or an 42(10) 2m . 2823 ( 3 1 . 6 2 ) 7 5 . 5 /4 1 0WS n W We q. (1 97 5 . 5 1 0 3 7 6 . 7 5 3 3 3 /E S V m is to an to a /2 an If we as a we by q. ( 0 ,4j k R ( be to . of we as of We by q. ( to in is 0 ,4 2014, ( we W by by a = of it to of of 8 to is d A( an as a or is by In to of to a 5%. as e of of to at is q. ( is q. ( By we 212,4 If in 2, p. 116. we as as 122,4we 12 a by 3: 24 ( We to it in of or 2 1212 224 R( 9 We of of f in 122 0 l o f R G d B G d B ( u on of a 3 5% is to q. ( 24 We of a 2/2 . By we 22 ( is ais On we 2993 4 1 0 0 . 5 5 8 6 8 50 . 3 1 0G(of a 50Hz a a 5 dB a a 0 20 200(50) - 25 - 20 = 88.3 to as is If we as in a as of 2 21 2 1 22 2 21 A A A f R c 10 is a a of of as of as is a as of a a a to a to to to a we be in a it in a We at a q. ( 2,4c ( s of is in or m : 10 CS on We by by of to 2, , ,4r e f l e c t e d s r r i Tp o w e r Sp o w e r d e n s i t y i n c i d e n t P G R ( In a we s of we q. (to at at a an We to to 22, , ,44R T T r r i ir e c R R A 11 We q. (to of to 23 22, , ,4T R r r i ir e R ( We q. (is 223 44P Ris (on an 2,4 by is P, of as an G: 2, ,4T T i P R P r G A is in a in
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