查询词典 design aid

Based on the research results of Chaos theory, in this dissertation, it has made detailed analysis of the chaotic signal generator. Firstly, the characteristic and various detection methods of chaotic signal are recommended. Secondly, with the aid of software, such as MATLAB, PSPICE, EWB, etc, discussion of the process of generating chaotic signal proceeds. Through simulation, the output result of several kinds of chaotic circuit are analyzed and compared. Thirdly, aiming at Chuas chaotic circuit, through debugging, the impacts by components and parts in the circuit, such as operation amplifier, capacity, inductor, etc, has been further investigated. And then provides a new scheme to implement Lorenz chaotic system, the circuit design and analysis are presented in detail and it can be realized by the hardware of programmable arrays FPGA, the experimental results indicate that this scheme has the advantages of easy operation, flexible design and high efficiency. An application example in secure communications is also provided. Finally, through picking up the characteristic parameter-Lyapunov exponent of the Chaos we can analyze the performance of different chaotic signal generators.

本文在混沌理论研究成果的基础上，对混沌信号的产生做了详细的分析，涵盖以下内容：首先介绍了混沌的定义，混沌信号的基本特性和各种判别方法，特别是对简单的一维Logistic映射的硬件实现问题做了初步探索；其次对混沌信号的产生方法进行讨论，借助于MATLAB、PSPICE、EWB等仿真软件，对几种混沌电路输出的混沌信号进行了分析比较，并在此基础上针对典型三阶连续自治系统Chua's电路作进一步实验研究，通过混沌电路调试，深入研究电路中各元器件，特别是运算放大器、电容、电感等对混沌信号时域以及频谱的影响；再次研究连续混沌系统的数字化硬件产生，设计了Lorenz混沌电路在现场可编程门阵列FPGA上实现的新方案，在保密通信中的应用实验结果表明该方案具有操作简单、设计灵活、效率高等优点；最后针对不同混沌系统，采取不同算法，提取混沌特性参数Lyapunov指数，进而对不同的混沌信号发生器的性能进行了分析。

In the conceptual stage of design, various design media are used to aid designers.

许多不同的媒材在建筑设计的初期构想阶段都被拿来辅助设计者。

The emulation and aid design of practical system, have become an important method for the design of automatic control system.

随着计算机技术的发展，处理工作量很大的计算问题变得愈加容易，利用数字计算机对实际系统进行仿真和辅助设计，已经成为自动控制系统设计的重要方法。

Computer has been used in every aspect of architectural design practice and it should be used as an important means to aid architectural design teaching.

电脑已经应用在建筑设计实践的各个方面，也应该成为辅助建筑设计教学的重要手段。

Typical values are for design aid only, not guaranteed nor subject to production testing.

典型值是唯一的设计援助，也不能保证受生产测试。

We need a CAD/CAE integration system to get a more automatic, more effective design aid system.

为了能够进一步提高分析设计效率，加大计算机辅助设计的自动化程度，我们需要实现一个CAD／CAE的集成系统。

Typical figures are at 25°C and are for design aid only; not guaranteed and not subject to production testing.

具有代表性的温度是25°C，仅作设计辅助，不保证，也不用于产品测试。

C. Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing.

角典型值是辅助设计只，不能保证生产测试，也不接受。

The trail calculator should be used as a design aid to give you a good idea of how changes in your bikes geometry effect the need for additional trail.

计算器的线索应作为设计的援助给你一个好主意如何变化，您的自行车几何效应需要更多的线索。

Design and Application of Computer Aid Design System of Micro Inertial Measurement Unit;2. We also made the computer aid design utilizing our own software and drew out the corresponding theoretical curve.

给出了多层损耗材料反射系数公式，使用具体材料的电磁参数，以三层结构为例进行了具体方案的设计，并用自行开发的软件进行了计算机辅助设计，绘制了相关的理论计算曲线。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。