A new method for realization of multi - channel data acquisition on windows flat form is brought forward in allusion to the feature of hyper - low frequency with water pressure pulsation in hydroelectric sets . and various anti - disturbance solutions are adopted in connection with the detection environment . the device proved to be able to has been meet predetermined requirement by its engineering application 针对水力发电机组水压脉动超低频特性，开发出一种在windows平台上实时多通道数据采集系统，并结合测试现场环境，提出了抗干扰的各种措施.经实际运用，达到了预定要求
In engineering project , no matter the vibratory and malfunction inspection of large water wheel generate electricity set and precise machine tool , or engineering project structure vibratory analysis and mode test , earthquake forecast and geologic reconnoitering , all need to use the ulf absolute vibratory transducer to scale and analyze the signal caused when running 在工程上,无论是大型水轮发电机组、精密机床的振动监测和故障诊断,还是工程结构振动分析和模态试验、地震预报与地质勘探,均需要能够检测超低频绝对振动信号的传感器来测量分析它们运行过程中产生的超低频振动信号。
Based on the discussion of the nonlinearity of the vibrator , the mathematic model of ultra - low - frequency vibrator is established . then , on the basis of the ziegler - nichols pid controller , pid control parameters are modified according to the control requirements of object , and the computer simulation is done . finally , low - frequency feedback system is built up , which solves the problem of high distortion of the output of vibrator under ultra - low frequency 从分析标准振动台在超低频时的非线性因素入手，建立了超低频标准振动台的数学模型；然后在zieglernichols法设计pid的基础上，根据控制对象的性能要求修正了pid参数，并作了仿真研究；最后设计出低频反馈系统，解决了振动台超低频失真度较大的问题。
In this dissertation , the present research status of standard vibration metrology technique at home and abroad is introduced , and the significance of developing ultra - low - frequency standard vibration metrology is discussed as well . systematic research has been done in developing ultra - low - frequency standard vibrator . several key technical problems are solved in order to develop the calibration system of this kind of vibrator 本文在分析了国内外标准振动计量技术的研究现状以及超低频标准振动计量的重要性的基础上，以研制超低频标准振动台校准系统为目的，对建立超低频标准振动台校准系统的若干关键技术及其实现方法进行了研究。
Firstly , the properties of vibration transducers and their calibration methods are given , and the significance of establishing ultra - low - frequency standard vibration calibration system is pointed out . secondly , the present research status on standard vibration metrology at home and abroad is surveyed . thirdly , some problems in the ultra - low - frequency standard vibration metrology and the future direction are pointed out 首先介绍了振动传感器的特点及其校准方法，指出建立超低频标准振动计量的重要性；然后回顾了国内外标准振动计量的研究现状；接着分析了超低频标准振动计量存在的问题并指出了研究方向；最后介绍本论文的研究内容。
The system introduces 991 ultra - low frequency pick up , and takes the vibration signal as the simulation input of practical measurement , which makes the s ystem can measure the ultra - low frequency vibration of long , large , tall and flexible structures and the low frequency vibration of engineering and site 系统引入991型超低频拾振器，将其拾取的振动信号作为本系统实际应用测试中模拟输入，使系统可对长大高柔结构的超低频振动和一般工程及场地的低频振动进行测量。
Against the status of large scale ultra low frequency air spring vibration isolation platform , which is low damping and poor performance of low frequency , and after analyzing the existing key damping system , a new type differential electromagnetic damping system ( emds ) is developed in this article in order to reduce the resonance peak of the platform effectively and improve the low frequency performance of the platform 本文针对大型超低频空气弹簧隔振平台阻尼小、低频隔振性能较差的现状,在比较多种提供阻尼力的方法后,提出了用电磁力作为隔振平台的阻尼力,并开发研制了差动式电磁阻尼器系统。该系统可以有效降低隔振平台的谐振峰值,从而达到了提高隔振平台低频性能的目的。
The apparatus , with the specialities such as miniature , automation , flexibility , and individual - computer managing has become the developing trendof the testing equipment today . based on analysis of the characteristic and the system structure of the visual instrument , the paper has studied the design idea of it , put forward the exploiting methods of the visual instrument based on the object - oriented technique , exoatiated on the technique kernel of design the visual instrument under windows environment , designed a typical visual instrument " vis - 1 signal - analyzing and wave - displaying system " , which integrates multi - function instruments such as general oscillograph and ulf oscillograph real - time signal recorder wave and frequency - pedigree analysis instrument . the system has more excellent functions and characteristics than traditional instruments 本文研究了虚拟仪器系统的设计思想，在分析虚拟仪器系统的特点及其体系结构的基础上，提出了基于面向对象技术的虚拟仪器系统开发方法；阐述了windows环境下实现虚拟仪器的技术要点；实现了一个典型的虚拟仪器系统“ vis ? 1信号示波分析系统” ，该系统集普通示波器、超低频示波器、存储示波器、瞬态信号记录仪、波形及频谱分析仪等多种仪器功能于一身，并具有许多传统仪器难以达到的优越功能和性能。
The hardware and software design methods of the system are discussed , and the methods that solve the problem under ultra - low frequency are emphasized , such as the design of ultra - low - frequency amplifier and the arithmetic of adjusting the vibrant level . in the end , many kinds of experiments prove the performance of total system 对校准系统的硬件和软件设计做了有侧重点的介绍，对解决超低频下振动台的技术难题的技术方法做了重点介绍，如低频功率放大器的设计和低频软件振级调整算法等；最后用各项试验数据验证了本校准系统的性能。
A lot of engineering applications are carried out using our proposed method in this paper , such as thermal deformation measurement of a car lamp , analysis of the super low frequency harmonic vibration of a piezoelectric ceramic , dynamic mechanical behavior analysis of the ballistite material and so on 在前面所提出的理论基础之上，本文对该方法在实际工程中的应用做出了大量的工作。本文利用时间序列法实现了汽车前灯配光镜的热变形检测、压电陶瓷片的超低频振动分析以及火箭固体燃料的动态力学特性研究。
