《河南工业大学学报（自然科学版）》全球网络传播情况分析

依据中国科学文献计量评价研究中心的统计数据,基于中国知网、中国学术期刊文献统计分析系统,对《河南工业大学学报(自然科学版)》2007年在中国大陆地区、中国港澳台地区和国外的发行传播情况进行统计和分析,旨在具体搞清楚该刊的国内外网络传播情况及期刊影响面,为进一步提高学报质量,扩大学报学术影响力提供基础数据.     

Spatially Sampled Pressure Profile Measurements in Externally Pressurized Gas Journal Bearings

Abstract

Externally pressurized gas journal bearings (EPGJBs) are widely adopted to support high-speed rotors. This article presents novel experimental benchmark test data that enable EPGJB model validation. Axial and circumferential pressure profile measurements are presented for a 40-mm-diameter annular restrictor EPGJB operating at speeds up to 25?krpm. The corresponding rotor position, air mass flow rate, and load capacity are also measured. The effects of supply pressure, rotational speed, and load on the measured variables are presented. The measurements are in good agreement with numerical model computations. The cases in which the model deviates from the measured data are discussed in terms of compressible flow theory.     

Performance of membrane compensated multirecess hydrostatic/hybrid flexible journal bearing system considering various recess shapes

The paper describes a theoretical study concerning the performance of an externally pressurized multirecess hydrostatic/hybrid flexible journal bearing system by varying the geometric shape of recess and using the membrane flow valve restrictor as a compensating element. The four different recess geometries of the bearing studied in the present study are a square recessed bearing, a circular recessed bearing, an elliptical recessed bearing and a triangular recessed bearing. The equation governing the flow of lubricant in a journal bearing together with 3D elasticity equation and restrictor flow equation are solved by using the Finite Element Method. The study describes the effect of recess shape, bearing flexibility and a method of compensation on the performance characteristics of a hydrostatic/hybrid journal bearing system. A comparative performance of the membrane compensated hydrostatic/hybrid journal bearing system has also been studied vis-à-vis capillary, orifice and constant flow valve restrictors. The results presented in this study amply demonstrate that the shape of recess/pocket of a hydrostatic/hybrid flexible journal bearing system affects the performance of the bearing quite appreciably and a proper selection of recess shape along with a suitable compensating device is needed to get an improved performance from the bearing.     

STUDY ON THE COUPLED ELECTROMECHANICAL DYNAMICS OF ROTOR SYSTEM EQUIPPED WITH MAGNETIC BEARINGS

The influences of thrust magnetic bearing and journal tilt on dynamic characteristics of rotor system are studied mainly. The outcome shows that the influences of coupling effects of thrust magnetic bearing and tilt of journal on critical rotational speeds of system are very large, and the stability of system reduces greatly. That shows it is important that the influence of coupling effects of thrust and radial magnetic bearings due to the rotor tilting must be considered in the study of rotor-magnetic bearings system dynamic characteristics, and also shows it is important that the rotor is mounted and debugged in ideal alignment of magnetic bearings.     

轴向缝切向进气轴颈轴承稳定性的试验研究

本文设计了组合式及嵌入式轴向缝切向进气轴颈轴承,将其装配到与１５０Ｎｍ＾３／ｈ制氧机配套的中压透平膨胀机上进行试验,实测了不同设计参数下的轴承失稳转还,并分析了影响轴承失稳转速的各种因素。     

《岩石力学与工程学报》的科学计量指标及其综合评价

汇集了《岩石力学与工程学报》(CJRME)1997～2001年的20项共64个科学计量指标值，并按其大小排出了CJRME在当年力学类的12种统计源期刊中的名次。对这些源刊的总被引频次、影响因子、即年指标、基金论文比和他引总引比等在2001年的指标值进行了综合评价。得出了CJRME在这些源刊中名列第3位的良好结果。     

《岩土工程学报》1998～2004年刊载论文统计分析

通过检索1998～2004年《岩土工程学报》刊载的学术论文,按照文献计量学的原理对该期刊的载文量、作者的地区和单位分布、核心第一作者等做了初步的统计分析,还按照论文的研究方法即其偏重于理论或实验的程度做了分类和讨论分析,从一个侧面揭示了我国岩土工程科研领域一些特点和规律,并对今后的办刊方向提出了一些建议。     

《满洲建筑杂志》中伊藤清造对于奉天宫殿的研究

在近代中国特殊的历史进程下,以伊藤清造为代表的日本学者对于中国东北地区进行了大量的建筑实物的调查研究。本文以伊藤清造对于奉天宫殿(沈阳故宫)的实地考察为研究典型,以《满洲建筑杂志》所传载的史料为依托,从微观视角着眼于伊藤清造对奉天宫殿建筑专业角度的个案调查与解读,对其专业学术文章的内容和特点进行解析和论述,以期为东北地区近代建筑文化及城市建筑现代转型的研究提供新的视域和参考。     

Rotordynamic Analysis of a Shaft Using Magnetorheological and Nanomagnetorheological Fluid Journal Bearings

The rotordynamic behavior of a system supported by journal bearings is critical to its reliability. A suitable method of control of the orbital motion of a shaft in a journal bearing is the use of smart lubricants, in effect fluids with controllable physical properties. There are various categories of smart lubricants. One class of smart lubricants, magnetorheological fluids, are produced as a dispersion of magnetic particles in a carrier fluid, which is usually a conventional lubricant. These particles form chains under the influence of a magnetic field, which hinder the lubricant flow, thus changing its apparent viscosity. Magnetorheological fluids (MRFs) exhibit high yield stress, low delay of response, and relatively low friction while not in their active state. A subcategory of MRFs, nanomagnetorheological fluids (NMRFs) with particle size on the nanometer scale, exhibits lower yield stress than MRFs but display high viscosity. The effect of the MRFs and NMRFs on the rotordynamic behavior of a shaft is calculated through a combined finite element and computational fluid dynamics analysis. Though the MRF with the specific geometrical configuration of the bearing is not sufficiently activated and therefore does not improve the performance of the magnetorheological journal bearing, the NMRF has the ability of limiting up to 82% the amplitude of the vibrations of the shaft.     

全尺寸径向滑动轴承试验台上轴承油膜参数识别

首先,概述了以不改变全尺寸静待性实验台整体结构为前提。在原有实验台上添加激振装置和测试仪器。增加动特性功能的必要和可能性。其次,概述了脉冲激励、振动测量、数据采集主动特性识别的基本原理,最后将测量结果与理论计算作了比较,并讨论了可能产生误差的各种原因。