部件

The low-frequency noise in the structure-acoustic field coupling system of high-speed train was simulated and analyzed.

对某高速列车拖车的仿真分析结果表明：该车声学测试点的总声压级超出了TB 1809—86标准拖车客室的容许噪声值；在某些计算频率下，车体某些部件涂敷阻尼材料后对客室测试点的声学贡献由小变大，这说明阻尼材料不仅改变了这些部件的振动幅值，同时也改变了振动相位。

Combined system simulation with optimal control, selected a typical water cooled primary/secondary chilled water system, used the research achievements of Annex 30 in IEA for the reference, this work firstly presents both the basic component models and the control system component models. Secondly gives the main models for parameter identification and experiment validation. Finally a dynamic digital simulator is set up using TRNSYS as the platform to substitute a real system to test and evaluate some kinds of online optimal supervisory control strategies after giving some essential data file input and finishing all the PID controllers'tuning.

本文将空调系统的仿真模拟与优化控制相结合，首先选择比较典型的水冷式二级泵集中空调系统，在国际能源组织IEA第30子课题Annex 30多年研究成果的基础上，建立了系统各设备的部件模型和控制系统部件模型，对主要模型参数的辨识方法进行分析，同时对其准确性给予验证；在此基础上，建立了以TRNSYS为仿真平台的集中空调水系统数字仿真器；通过必备数据文件的输入和对所有下位机控制回路PID参数的调试，最终完成可用于评估各种上位机优化控制方案的空调水系统数字仿真器。

Component parts such as fitt in gs and pallet bases may also be used provided such components have not in any way been damaged in previous use.

还可以使用某些部件，诸如配件和托盘，只要这些部件在过去使用时未有任何损坏。

At last, the software for upper machine and lower machine is introduced.Chapter 3, on the basis of the experiment on the nano feeding control platform, the mathematic modal of drive parts is established considering that the nano feeding under large feeding force has some open air temperature random disturbance phenomenon which influences the feed precision.

第三章，首先对建立数学模型的分步拟合方法进行了介绍，接着，在实验的基础上，通过拟合的方法得出纳米级热驱动部件输入功率与输出位移的数学传递函数以及外界温度干扰与输出位移的数学传递函数，最后建立了干扰情况下的纳米级热驱动部件数学模型。

Girts and other members to which rigid wall panels will be attached shall be fabricated within tolerances that will permit faces of such members to be field aligned in true vertical planes within 1/8 inch (3 mm) tolerance.

对于以钢性墙板作为附属物的围梁和其他部件，装配时要保证容差，容差允许这些部件排列在一个真正垂直面内。

For instance: MCU is used as the controller, GSM as the communication component, GPS as the Global Position component, PPI as the data exchange interface with PLC controller, and they communicate through their own channels respectively without disturbance.2. According to the special function demands of the grab machine, a series of practical communications protocol has been made.

该终端以单片机作为控制器，GSM作为与外部通信部件，GPS作为全球定位信息采集部件，PPI作为与工程机械PLC数据交换接口，通过多路通信接口实现信息互不干扰传输。

The static and dynamic characteristics of the beam of a gantry-type machining center are analyzed by means of ADAMS and ANSYS. Considering effect of gravity and cutting forces, the static deformation of the beam is obtained after calculating the interacting forces between the guide and the slide block by ADAMS. Moreover, the contact parameters of the guide surface are acquired by dynamic tests and parameter identification, then they are applied to the simulation model of the beam-slide box system, whose natural frequencies and modal shapes are achieved by modal analysis. Furthermore, the effect of changes of the contact parameters on the dynamic behavior of the beam-slide box system is also investigated.

对一种国产龙门式加工中心的横梁关键部件，采用机械系统多刚体动力学仿真软件ADAMS和有限元分析软件ANSYS进行了静动态特性分析；在考虑重力和切削力作用下，由ADAMS计算出导轨与滑块间的作用力，从而计算出横梁部件的静态变形；通过动态测试和参数辨识方法获得导轨结合面特性参数并将其应用到横梁滑箱系统整体有限元模型中，经过模态分析得到系统固有频率和各阶振型图，并进一步分析了结合面参数变化对横梁滑箱系统整体动态特性的影响。

Various ideographs can be configured with these components used in conjunction with other components.

部件与部件相结合可构成各种字形。

In order to make quantitative analysis of the interference situation during insertion and fit of large components,a template based interference detection technology is proposed.

为了定量分析大型部件对合插配时的干涉情况，提出一种基于模板的大型部件对合插配干涉检测方法。

Widgets need to know whether it's first time load of the widget or is it a postback.

部件需要知道它是第一次的部件负载，还是一回。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。