高度保持

高度保持（ALTHOLD），自动驾驶仪或飞行指引仪保持在选定高度的一种方式。

ALTITUDE HOLD ( ALT HOLD ), A mode of the autopilot or flight director to maintain a selected altitude .

以某大型飞机为例对飞机纵向、侧向飞行模态（俯仰姿态保持、高度保持、纵向着陆、协调转弯、航向保持、侧向偏离修正和给定航迹控制）进行了设计与仿真。

Some aircraft modes , such as attitude hold , altitude hold , automatic landing , turn coordination , heading hold and lateral bias modification are designed and simulated .

结合经典的PID控制理论，对导航平台的控制原理进行研究，并设计出姿态保持与控制回路、高度保持与控制回路、航向保持与控制回路的具体实施方法。

Combined classic PID control theory , the control principle of the navigation platform is studied , and the specific implementation measures of altitude control loop , height control loop and heading control loop are given .

方法：采样高度保持在呼吸带，采样时间为30min。

The location of sampling was in respiratory area . The time of sampling was 30 minutes .

在1600℃下反应8h，木炭几乎完全转变成βSiC，并高度保持椴木的微观结构，弯曲强度和气孔率分别为41.6MPa和53.2%。

After reaction for 8 h at 1 600 ℃, basswood charcoal converts into SiC ceramic nearly completely , and the bending strength and porosity are 41.6 MPa and 53.2 % , respectively .

然后，针对纵向控制系统，研究了其组成和控制方案，分别用常规PID和智能PID方法设计了纵向俯仰姿态保持、高度保持模态的控制律，并对两种控制方法的控制效果进行了对比。

Thirdly , the constitute and control scheme of the lognitudinal control system is studied . Then , traditional PID control and intelligent PID control is respectively used to design and simulate the laws of pitching pose holding mode and high holding mode .

结果表明，小波分解层数为3的小波比值方法既很大程度地提高了空间纹理细节信息，又高度保持了原始多光谱影像的光谱特征，适合于Quickbird遥感影像融合。

The result shows the wavelet-ratio method whose wavelet decomposition number is 3 is the very method that suits for the fusion of Quick Bird images . It improves the high spatial information apparently and keeps the spectral characteristics of original multispectral images highly at the same time .

构建了波音737-300飞行模拟机的高度保持系统。

An altitude maintenance system was built up for B737-300 full flight simulator .

研究了某型飞机在高度保持方式下引入指令驾驶系统的方案。

This paper makes a study of that certain type airplane inducts the instruction steering system .

进行了空速保持、高度保持、航向保持和转弯控制等控制律的详细分析。

The control principle of airspeed keeping , altitude keeping , course keeping and swerve control is analyzed , too .

只要它的体重与它的高度保持均衡，越高的狗越有价值。

As long as the weight stays in proportion with the height , the taller the dog the more prized .

介绍了飞机高度保持系统的工作原理，建立模拟机高度保持系统的数学模型，分析解决了系统中的静差问题，并对该模型进行仿真验证。

The working principle of the altitude maintenance system was introduced , the related mathematical models were built up , and the problem of static error of system was solved .

改变固定板之间的距离就能改变弧形条状体的支承力，使人在仰卧时的枕头高度保持略低、而侧卧时枕头又会自行抬高。

The height of the pillow is kept slightly low when a person at a supine position , and at the time of side lying , the pillow can also be raised automatically .

研究了无人机的飞行控制技术，利用根轨迹法设计了无人机的纵向与侧向姿态保持控制律，设计了高度保持、航向保持、自动油门及速度保持控制律。

The control laws of longitudinal and lateral-directional autopilot modes are designed based on root locus theory . The control laws of altitude holding mode , heading holding mode , auto-throttle control and air speed holding mode are designed as well .

本文中所涉及到的高低墩高差变化是指：低墩高度保持不变，高墩高度增加而产生的两桥墩高差上的变化。

The height difference between high pier and low pier in this paper is that : keep the height of low pier unchangeable , while change the height of high pier , thus , there will appear the height difference between high pier and low pier .

这个高度向前保持多远？

How far forward is this height maintained ?

收紧腹部，吸气并且举起左腿至髋部高度，保持足背屈。

Tighten abdominals , inhale and lift left leg to hip height keeping foot flexed .

一定要把水注满使水平高度总保持不变。

Make sure to top up the water level so that is always remains the same .

单击鼠标会增加高度，保持鼠标按下状态移动鼠标会不断的升高高度直到达到高度的最大值。

Keeping the mouse button depressed and moving the mouse will continually raise the height until the maximum height is reached .

崛起是可持续发展的基础与前提，可持续是在崛起的高度上保持全面、长期、稳定发展。

Rising is the basis and premise of sustainable development , and sustainability is to keep comprehensive , longtime and steady development on the basis of rising .

把不舒服的办公室座椅换成平衡球，只要保证这个平衡球高度足够保持你的姿势满足上面的要求。

Skip that poorly positioned office chair in favor of a fitness ball , just make sure the ball is tall enough to keep your posture in line with the tips above .

飞机现在失去操纵，我在现在的高度上不能保持平飞。

The aircraft is lost control now , I can not maintain level flight at present altitude .

从报告当中可以显而易见地看出，中国高度重视在保持总体稳定的同时寻求可持续发展。

It is evident from the report that China places high priority on seeking continued development while maintaining overall stability .

电信企业只有从战略的高度，长久保持和提升企业核心竞争力，才能适应国际的竞争和挑战。

Only thinking strategically , telecoms companies retain and raise their core competence , as well as adapt international competition and challenges .

无论车辆装载情况如何，车身高度可以基本保持不变或可以根据需要进行调节。

Regardless of vehicles ' loading condition , the high of vehicles'body can basically maintain invariable or can adjust according to the need .

法国有关部门表示，日新增新冠感染人数已出现下降的趋势，并敦促人们保持高度警惕以保持这一势头。

French authorities say the daily increase in COVID-19 infections has begun to drop , urging a high level of vigilance to maintain the momentum .

优势项目和科研高度发展是保持世界田径强国的两个关键因素。

The advantages of the project and a high degree of scientific research and development are two key factors that keep the world track and field power .

第三，本文对基于模糊参数自适应PID控制系统和小脑神经网络与PID复合控制算法进行了探讨，并分别应用在高度控制和航向保持模式。

This thesis investigates the fuzzy adaptive PID controller and the integrated control combining cerebella model articulation controller with PID algorithm applying to UAV heading hold mode and altitude hold mode separately .

一种高度浓缩和语义保持的数据立方

A Highly Condensed and Semantics-Preserving Data Cube

同时，辅之以上部调节，使煤气流分布沿高炉高度及其截面继续保持合理。

Process regulation in the upper part of the furnace is also necessary , to ensure correct gas flow distribution along the height and across the section of the furnace .