首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Inertial guidance is the name given to those types of systems which guide and keep track of the location of vehicles which are f
Inertial guidance is the name given to those types of systems which guide and keep track of the location of vehicles which are f
admin
2010-07-06
59
问题
Inertial guidance is the name given to those types of systems which guide and keep track of the location of vehicles which are free to move in three dimensions. Vehicles which move only on a plane surface, such as ships or automobiles, require only an accurate compass, sextant, and clock to keep track of their present position. When a vehicle can travel up or down as well as north or east, it is much more difficult to fix its position. An inertial platform is used in inertial guidance to measure vehicle altitude and acceleration which are then integrated to provide position and velocity. The inertial platform consists of three gyroscopes and three accelerometers mounted in the inner gimbal of the four gimbal platform. The purpose of the inertial platform is to allow the vehicle to move in any direction about the inner gimbal containing the gyros and accelerometers, without disturbing or turning them from their original orientation. Thus the gyros and accelerometers do not mm when the vehicle turns so they sense altitude and acceleration with respect to their original inertial reference frame. If the acceleration is always known with respect to this original inertial reference frame, it can be integrated to provide velocity and then integrated again to provide distance. Thus the distance and velocity of the vehicle with respect to its starting point are known.
Inertial guidance systems are used today in airplanes, submarines, and spacecraft. They display for the pilot his pitch, roll and yaw angles, his heading, his speed, and his latitude and longitude. These are very important items to have readily available, whether one is in a high speed vehicle with very low visibility due to poor weather, or in a spacecraft traveling in lunar orbit. The main features of inertial systems are that they are automatic and do not require any external information. Thus, the pilot does not have to feed in any information except the original position and altitude. Inertial systems serve a need on fast moving vehicles moving in a three dimensional plane, where position information is required by the pilot almost constantly.
The inertial platform is mainly used
选项
A、to prevent the ship or plane from moving off course.
B、to send information from the ground control unit.
C、to maintain the speed of the ship or plane.
D、to prevent a change in the systems orientation.
答案
D
解析
本题考查细节。由第一段第六句话,“The purpose of the inertial platform is to allow the vehicle to move in any direction about the inner gimbal(万向接头)containing the gyros and accelerometers,without disturbing or turning them from their original orientation.”可知这种制导系统的工作台的目的就是防止系统改变原来的方向。所以选项D 正确。
转载请注明原文地址:https://kaotiyun.com/show/mfDd777K
本试题收录于:
公共英语四级笔试题库公共英语(PETS)分类
0
公共英语四级笔试
公共英语(PETS)
相关试题推荐
Whatdidthespeakertalkaboutlasttime?
DoesthepublisherofDouglasStarr’sexcellentBlood—AnEpicHistoryofMedicineandCommerceactuallyexpecttosellmanycopi
HowdoesAusubelfeelaboutthescientificprogressmadeeveryday?Thespeaker’sfriendswerefuriousbecausetheirreportdid
Oneofthemostalarmingthingsaboutthecrisisintheglobalfinancialsystemisthatthewarningsignshavebeenouttherefo
Miserabilists’fearofchange;idealists’hopeforabetterworld;anall-purposeadultnostalgiaforlostyouth:allthesethin
WhoearnslessintheUnitedStatesthanthoseinmanyindustrializedcountries?WhatistheshortagetheUnitedStateswillfa
Themainpurposeofthefirstparagraphis______.WhatdidthefuturelooklikeforBritain’sfoodproductionatthetimeofw
Howmanypeopleinthefrontofthevehiclesarekilledorseriouslyinjuredeveryyear?Wearingaseatbeltinavehicle
Accordingtothepassage,thechiefpurposeofexplorersingoingtounknownplacesinthepastwas______.Whatisthemaingo
随机试题
从100人中调查对A、B两种2008年北京奥运会吉祥物的设计方案的意见,结果选A方案的人数是全体接受调查人数的3/5;选B方案的比选A方案的多6人,对两个方案都不喜欢的人数比对两个方案都喜欢的人数的1/3多2人,则两个方案都不喜欢的人数是()。
下列病变中,斜位吞钡检查,不形成食管压迹的是
A.多饮、多食、多尿、消瘦B.乏力、纳差、血压低、皮肤色素黑C.蛋白尿、水肿、高脂、低蛋白血症D.怕热多汗、疲乏无力、急躁易怒E.蛋白尿、血尿、高血压
知图5-9所示等直杆的轴力图(图中集中荷载单位为kN,分布荷载单位为kN/m),则该杆相应的荷载为()。
隐框玻璃幕墙玻璃板块制作前对基材进行的清洁工作,符合“两次擦”工艺要求的是()。
会计核算上,企业将融资租入的设备计入固定资产,体现了()原则。
观察法是学校教育中常用的研究方法。以观察者是否参与被观察对象的活动为标准,可以将观察法分为()。
要搞好接待工作,沟通好党群、政群的关系,信访接待人员一定要()。
中央电视台举办的“年度感动中国十大人物评选活动”的颁奖辞中有这样一句话:“这个风一样的年轻人,他不断超越,永不言败,代表着一个正在加速的民族。他身披国旗,一跃站在世界面前。”这段文字中“风一样的年轻人”是一个极致的比喻,它主要用于说明()。
司法工作人员帮助在押犯脱逃的,一律成立私放在押人员罪,请对这一说法进行辨析。
最新回复
(
0
)