signal n. 1.信号,暗号;信号器。 2.动机,导火线 (for)。 3.预兆,征象。 call signal 【无线电】呼号。 an alarm signal 警报(器)。 an information signal 〔美国〕暴风警报(旗)。 an international code of signals 国际通用信号。 a signal of distress =a distress signal 船只失事信号。 adj. 1.暗号的,作信号用的。 2.显著的,非常的,优越的。 a signal victory [defeat] 大胜[败]。 vt.,vi. (〔英国〕 -ll-) 发信号[警报]给(人、船等);用信号[警报]通知(暴风、危险等);用动作[手势]示意;预示。 a signaling bomb 信号弹。
The method can be used widely in high precision frequency , time and phase measurement . combined with a kind of precise , constant gate ' s measuring method that is derived from the several period synchronization measuring method , high speed , high precision , successive frequency measurement can be fulfilled . it adapts well to the sensor signal measurement of non - frequency 此方法可以广泛地应用于高精度频率、时间及相位测量中,将其与一种从多周期同步法发展而来的高精度、定闸门测量法相结合,可实现高速、高精度、连续频率测量,而这一点非常适合非频率量传感信号的测量。
Thirdly , in the environment of labview , several kinds of vis used for sensor signal test are designed , including wave generation , time domain measurement , filter disposal , frequency analysis , etc . after that , wavelet analysis in the application of one - dimensional signal de - noise is studied , threshold and translation invariance wavelet de - noise are realized , and wavelet de - noise vi for zero drift signal of the fiber optic gyro in fcs is designed using labview 接着,在labview环境下开发了多种用于传感器信号测试的虚拟仪器,具有波形发生、时域测量、滤波处理、频谱分析等多种功能。随后,研究了小波分析在一维信号消噪中的应用,实现了labview环境下的阈值法和平移不变量法小波消噪,并利用labview设计了飞控系统中光纤陀螺零漂信号的小波消噪仪。
According to the requirement of the national natural science foundation “ research of the self - operation and collision avoidance fuzzy theory for robots based on sensitive skin ” , a novel hardware system structure based on dsp + fpga is designed to process the sensors signal of robotic sensitive skin , and spectrum analysis method based on fast fourier transform is used for analyzing the signal 本文结合国家自然科学基金项目“基于传感皮肤的机器人自主模糊避碰运动方法研究” ,根据机器人敏感皮肤系统的具体要求,设计了基于dsp + fpga的机器人敏感皮肤信号处理系统,并采用基于快速傅立叶变换的谱分析方法对信号进行处理。
Based on the analysis of autonomous underwater vehicle ( auv ) sensor failure , diagnosis methods corresponding to three kinds of sensor failure are presented , that is , through that no sensor output for a long time to diagnose the fault of sensor signal gathered keeping unchanged , linear smoothing to solve the vibration of sensor signal , wavelet transform to inspect the broken sensor signal 摘要在分析水下机器人传感器故障形式的基础上,对传感器可能出现的三种故障形式分别给出了相应的诊断方法,即通过传感器长时间采集不到数据来诊断传感器信息保持不变的故障,线性平滑滤波解决传感器输出振荡,小波变换检测传感器信息的突变。
A infrared system with which can detecte the pulse of human . because human body are semitransparent , and the transparence of it change along with the heart beat . the infrared sensor can detecte the change , we may tanslate the signal from sensor into a digital form by a cmos ic . when the signal change into a digital form , another ic can get the rhythm of the heart from the analog ic . this article designed the anologe ic which got the sensor signal into digital form 本论文完成了一个基于反射型红外线传感器的cmos模拟专用集成电路的设计,它构成的红外系统具有探测心跳频率的功能。设计根据人体组织的半透明度会随心脏跳动而变化的特点,由传感器探测到这一变化,通过专用集成电路将信号放大并利用,获得心跳频率。本模拟芯片结合数字电路可计算即时心率或统计心跳总数。
Different characteristic parameters fitting for different damage detection methods are extracted from the filtered sensors signal by hht technology . at last , the location and the degree of damage in the composite material can be determined by using defferent damage detection methods . this study adopts active detection technique based on lamb wave to monitor damage in composite materials 并且针对每种损伤定位方法选择有效的描述结构损伤的特征参数,利用四种不同的方法对结构进行损伤定位和损伤程度的识别,通过实验证明,这四种损伤识别方法均能有效准确的识别出损伤位置和损伤程度。
Pzt ceramics are bonded on the surface of fiberglass - reinforced composite materials acting as both actuators and sensors to generate and collect lamb wave . characteristic parameters are extracted from the filtered sensors signal by hht method . using these parameters in different methods for damage detection , the location and the degree of damage in the composite material can be determined 综上,本文采用lamb波主动监测技术,选择合适的激励信号,利用粘贴在复合材料结构表面上的压电元件,在复合材料结构中激发出lamb波并接收传感信号,利用hht方法分析经过滤波后的传感信号,提取出表示损伤的特征参数,运用不同的损伤识别方法实现对复合材料结构的损伤定位和损伤程度的识别。
The early studies are mostly focused on the method of gluing piezoceramics on structural surfaces , which has some disadvantages such as difficulties to protect the ceramics and the connection wires , bad coupling with only one surface glued on the base materials , low signal - to - noise ratio etc . these problems can be solved using the embedded piezoceramics , and furthermore , the piezoceramics can be placed in the optimal positions , especially in the optimal deepness for the piezo - actuators , according to an optimization algorithm befor e they are embedded , so the actuator effects and sensor signals are thereby enhanced 早期的研究主要集中在表面粘贴压电片的结构,表面粘贴压电片具有一些无法克服的缺点。本文着重进行利用埋入复合材料结构的压电传感器和压电驱动器对其振动进行主动控制的相关理论和实验研究,并介绍其相应结果。埋入型压电材料的优点主要是能保护压电传感器和作动器及其连线、增强压电材料和基体材料的耦合、优化埋入压电陶瓷的深度和厚度可增强压电传感器的测量信号并提高信噪比等。
In the operation of the doubly salient permanent magnet ( dspm ) motor , some possible failures can occur , including the wrong connections of three armature windings , the wrong orders of three hall sensors , and the failures of hall sensor signals themselves , that is the hail sensor signal keeps the high level or the low level to be unchanged with the rotor position 摘要永磁双凸极电机运行时,可能会出现以下常见故障:三相绕组线或和三相霍尔连接线的错误接线;霍尔信号自身的故障,即恒为高电平或低电平,其电平不随转子位置变化而变化。
The specific route is as follows : firstly , the output signals from the multipath sensor are nornalized , i . e . , all sensor signals ( including the analog data ) are transformed into multipath square wave pulse signals to form multipath parallel condition codes . these codes are treated as input signals for dac to obtain a series of dispersed analog signals for output as input signals for the vco . finally , a high frequency modulation signal is conducted at the vco ' s output 具体技术路线如下:先将由多路传感器输出的信号进行归一化处理,即将所有传感器信号(包括模拟量)转换成多路方波脉冲信号,以形成多位并行信号的状态码,将其作为dac的数据输入信号,从而得到一系列离散的模拟信号输出,作为vco的输入信号,最终在vco输出端形成高频的调制信号。