基于冲击碰撞模型的空间对接半物理仿真真实性验证方法

为了精确定量研究空间对接动力学半物理(HIL,Hardware-In-the-Loop)仿真系统的仿真结果真实性问题,利用无阻尼弹性碰撞动力学模型构造了空间对接动力学半物理仿真的验证模型,提出了描述半物理仿真系统仿真真实性的评价参数,并推导了计算公式。设计了用于半物理仿真试验研究的验证机构,较详细阐述了试验验证方法。建立了空间对接动力学半物理仿真的试验验证系统。在试验系统的水平和铅锤两个平动自由度上,进行了半物理仿真验证试验研究。验证试验结果及试验系统调试过程表明:所阐述的空间对接动力学半物理仿真系统的验证思想和方法是可行的和实用的。     

Self-organization processes and sedimentation stability in detonation nanodiamond suspensions

Problems related to the stabilization of suspensions prepared from a dry detonation nanodiamond (DND) powder have been studied. Secondary DND suspensions have been obtained and factors influencing their stability with respect to sedimentation have been analyzed. It is shown that the self-organization of particles in DND suspensions in combination with their periodic ultrasonic treatment can be used to convert the maximum possible mass fraction of DND particles in secondary suspensions into nanodimensional (5–100 nm) forms.     

Characteristics of protective filters for visual display units and methods of measuring them

A method used to determine the transfer constant of a protective filter in the 0–100 kHz frequency band is analyzed. The drawbacks of the method and ways of eliminating them are described.Translated from Izmeritel'naya Tekhnika, No. 8, pp. 54–57, August, 1995.     

Up-to-date method for measuring moisture

Conclusions The existing experience in developing moisture meters serves to arrive at only the preliminary conclusions about the advisability of using certain methods of measurement (composition-property bonds) for given materials. At the same time, moisture content is being measured by an increasing number of new insufficiently studied or approved methods, many of which may happen to be very convenient and promising. The studying and wide generalization of theoretical and practical work on moisture-content measurements is of considerable interest for our instrument-making industry. As a result of such work, convincing recommendations can be made on the application of various types of composition-property bonds in developing high-quality and reliable moisture meters.Translated from Izmeritel'naya Tekhnika, No. 5, pp. 3–5, May, 1967.     

Theory of a reactive method for measuring dielectric losses

Summary Expression (18), in which function A₀ is obtainable in a tabulated form [3], relates the quantities which are to be measured with the parameters of the measuring circuit. Expression (13) can also be used for selecting the grid voltage amplitude for a sufficiently close coupling and the optimum anode supply voltage.Moreover, an analysis of (18) provides a linear scale for the instrument over a sufficiently wide range. This is confirmed experimentally by means of loss angle standards for frequencies of 0.3 and 1.0 Mc developed by the VNIIM (All-Union Scientific Research Institute of Metrology). The residual loss of the instrument determined by means of two loss angle standards of the same capacitance (the error due to the ohmic resistance of the tuned circuit coil is excluded) remains the same over the whole scale.     

Neural-network-based method of calibration and measurandreconstruction for a high-pressure measuring system

The problem of applying the neural networks for static calibration of measuring systems and for measurand reconstruction is addressed. A multilayered neural network based method for the static calibration of this system is proposed. The functioning of the calibrated measuring system is based on three fiber-optic transducers whose static characteristics are nonmonotonic and significantly influenced by temperature. The applicability of the proposed calibration method is demonstrated in the case under consideration using synthetic and real data. The neural network is designed and implemented in a general purpose microcontroller. In comparison with the spline-based method of calibration, for the same reference data, the proposed method allows obtention of a better quality of calibration and, most important, when calibrated, the multilayered neural network does not require the measurement of temperature for pressure reconstruction     

A method of measuring the vectors of jointly acting harmonic signals by sampling them and summing the samples

A method for the rapid separate measurement of the vectors of jointly acting harmonic signals using frequency-dependent sampling and summation of the samples is considered. A theoretical justification of the method is given and the measurement errors and the possibility of realizing the method in practice are discussed.     

Simple method for measuring frequency chirps with a Fabry-Perot interferometer

A simple method for measuring the frequency-chirped response of lasers is presented. This method relates the deviation from the Lorentzian line shape of the transmission of a Fabry-Perot interferometer to the frequency chirp of the laser and allows a direct measurement of the frequency chirp. Two chirps produced by an external-cavity laser diode with an intracavity electro-optic crystal were measured. The first measurement was of a linear chirp of 800 MHz occurring in a time of 12.3 mus, and the second measurement was of eight repeated 800-MHz linear chirps each occurring in 337 mus. Agreement between the measured and the expected frequency-chirped response of the laser is shown.     

Pulse-adiabatic method for measuring spedific heat

Conclusions The method suggested here is an absolute method and produces true specific heat values since the measurements are taken in a narrow temperature range (0.5–l°C). The plate-specimen has a shape most suitable for many materials.Translated from Izmeritel'naya Tekhnika, No. 9, p. 52, September, 1968.     

Comparative method for measuring thermal conductivity

A comparative method is developed for measuring the thermal conductivity of solid and dispersed materials with λ=0.1-80 W/(m · °K). The method is accurate, rapid, and simple to use.     

列车舒适度和平稳性检测仪的设计与实现

为实现高速列车舒适度和平稳性的实时检测,根据UIC513标准和GB 5595-1985,采用EPC-8000I-L嵌入式工控机主板和Linux实时操作系统设计并实现了一种人机界面丰富、实时性强、携带方便的列车舒适度和平稳性检测仪,重点讨论了平稳性舒适度检测仪的硬件结构、人机界面设计、数据处理方法以及为提高实时性所采用的模块拆分算法。通过把检测仪采集到的原始振动加速度信号传输给计算机进行检验计算,将计算结果和检测仪的检测结果进行对比分析,验证测试仪能够实时地准确测量并显示列车的舒适度和平稳性。