Volume 20,Issue 2,1997 Table of Contents

1 Perturbation Analysis of Complex Modes for Vibration System with Viscous Damping and Its Application

1997, 20(2):1-9.

[Abstract](879) [HTML](0) [PDF 416.34 K](1273)

Abstract:
The sensitivity characteristics of the undamped natural frequencies and complex mode shapes of vibration system with the non-proportional viscous damping with respect to structural mass, stiffness and damping modifications are analyzed in this paper using the matrix perturbation of complex modes. The general principles for the selectivity of the design and the most sensitive positions of the structural perturbation modifications are shown thereby. This is of importance to a great computational savings in the dynamic characteristic improvement of large or complex structures. By the dynamic characteristic sensitivity analysis of a test device type RDT-1,the optimal structural design for its especial requirement of dynamic characteristics is obtained easily and the principles presented in this paper are confirmed by the numerical results of perturbation analysis.

2 A System Level Fault Diagnosis Problem

Yang Xiaofan Chen Tinghuai He Zhongshi

1997, 20(2):10-16.

[Abstract](475) [HTML](0) [PDF 305.95 K](1025)

Abstract:
寻找症候的最小相容集，这是系统级故障诊断的一个重要问题，在Ｃｈｗａ－Ｈａｋｉｍｉ模型下，我们证明了两个结果：１）对于二分图系统，该问题是ＮＰ难的；２）对于森林系统，该问题是多项式时间可解的。

3 Gait Experiment on the Level Walking During Activities of Daily Living

Chen Xiaoan

1997, 20(2):17-21.

[Abstract](524) [HTML](0) [PDF 255.27 K](93)

Abstract:
The gait study is one of the focus researches of biomechanics of the human movement and recovery medicine. This paper concerning the gait experiment on the level walking during activities of daily living is presented.Tests that have been carrying out include straight line walking, circular arc walking and right angle turn whilst walking.Subjects are required to undertake these tests at their own natural walking pace and stride length and at three different walking speed carrying 10 kg load in his right hand or carrying no load, In addintion, the experimental facilities and method are also discussed.

4 Two Finite Element Methods for Dynamic Analysis of Soft Tissue Structures

Yan Bo Zhang Peiyuan Zhou Song Zhang Hongyan

1997, 20(2):45-50.

[Abstract](577) [HTML](0) [PDF 238.42 K](107)

Abstract:
针对人体肌骨软组织小变形线性双相模型，采用Ｇａｌｅｒｋｉｎ加权残值法，导出了两种求解软组织结构动力响应的有限元公式。一是通过在连续方程中引入压力ｐ与罚参数β之比项，消去控制方程中的压力项得到的罚有限元公式；二是以位移和压力为两类变量导出的混合有限元公式。

5 Reliability Research on D.C. Broad Control System of Cadmium Nickel Accumulator

Zhao Wenqi

1997, 20(2):51-56.

[Abstract](612) [HTML](0) [PDF 284.21 K](232)

Abstract:
Based on the D.C. board working principles of cadmium nickel accumulator, in this paper several operating connection modes are analyzed when D.C. board is working under the system fault status. An improved method of control circuit which can reliably cut out faults in unreliable operating mode is proposed.

6 The Analytical Solution of AViscoelastic Dynamics

Cai Kunbao Yu Jihui Yang Ruifang

1997, 20(2):57-62.

[Abstract](886) [HTML](0) [PDF 209.05 K](150)

Abstract:
对依据粘弹性对应原理所得的粘弹性棒复频域动态响应，采用拉氏反变换的Ｂｒｏｍｗｉｃｈ积分公式，求得粘弹性棒的时域解析解。将该解析解与采用Ｄｕｒｂｉｎ拉氏变换数值反演法所得的数值解相比较表明，数值解几乎与解析解具有相同的精度。

7 Optimal Design of Plane Cascades Based on Wavelet Theory

Li Jianping Zhang Wanping Chen Tinghuai Shu Wenzhi

1997, 20(2):63-68.

[Abstract](562) [HTML](0) [PDF 242.21 K](135)

Abstract:
Based on the optimal control theory and Lagrange interpolation an optimal design model of plane cascades of 3D blade in an arbitrary surface of revolution is established. Using wavelet theory to solve the model, and lots of numerical results are obtained. The results show that the wavelet method is more effective than the conventional methods.

8 Study on the Chemical Composition and Macromolecular Structure of Outburst Zone Coal

Xu Longjun Xian Xuefu Zhang Daijun

1997, 20(2):69-73.

[Abstract](480) [HTML](0) [PDF 211.68 K](123)

Abstract:
In the light of ultimate analysis data and density of specific gravity liquid, we put forward a formula to calculate the real density of vitrinite, and get a relatively exact computational formula of condensation ring index. The molar fraction of carbon atom ( x C ) could be used to describe the metamorphic degree of coal. Relationship between the macromolecular structure and the probability of coal outburst has been discussed.

9 Effects of Cold Drawing and Water Quench Process on Mechanical Properties Prestressed Wires

Feng Guangchun Fan Jiatang Zhang Peng

1997, 20(2):74-79.

[Abstract](524) [HTML](0) [PDF 280.77 K](949)

Abstract:
Effects of cold drawing and water quench process on mechanical properties of prestressed wires have been studied in laboratory. It shows that sorbitized treat using water quench replacing lead quench is possible for Carbon steels prestressed wires. The cold drawing and water quench process which enable the mechanical properties of wires reaching specified demand of present standards are determined.

10 The Influence of Process Factor on Exterior Diameter Precision

Zhang Caian

1997, 20(2):80-83.

[Abstract](535) [HTML](0) [PDF 147.29 K](886)

Abstract:
研究了空拔减径量、模角、钢管材质和加工硬化对冷拔钢管外径精度的影响，为合理拟订冷拔工艺、高精度地生产冷拔钢管奠定了基础。

11 The Coupling Mechanism Study of Aluminate Coupling Agent on the Surface of Flyash Microspheres

Zhang Yunhuai Zeng Zhengquan Ou Zhongwen

1997, 20(2):84-88.

[Abstract](581) [HTML](0) [PDF 210.59 K](930)

Abstract:
The monolayer model about aluminate coupling agent on the surface of flysah microsphares is proposed. The chemincal coupling mechanism on the boundary of aluminate coupling agent with flyash microspheres is verified by the methods of IR and EMS analyses.

12 Dynamic Optimization of System Parameters For the Epicyclic Gear Drive with Internal Tooth

Zhu Caichao Qin Datong LiRunfang Cheng Zongyuan

1997, 20(2):89-94.

[Abstract](632) [HTML](0) [PDF 238.21 K](1011)

Abstract:
The epicyclic gear drive with internal tooth has been analysed,the formula has been also deduced for computing the inertial force and change of contact force,and the dynamic optimization of system parameters for the force of bearing has been carried,it has given a reliable proof to reduce the dynamic load and prolong the life of bearing of three ring type reducer.

13 Mathematical Model of Bile Flow in a Contracting Callbladder

Long Tianyu Yang Ruifang Wu Yunpeng

1997, 20(2):95-99.

[Abstract](507) [HTML](0) [PDF 222.47 K](831)

Abstract:
On the basis of the features of contracting gallbladder and properties of gallbladder bile,the mathematical model of bile flow in a living contracting gallbladder is proposed,the velocity distribution and pressure distribution are calculated by SIMPLER method.The results show that there exist obvious S vorteices near the exit, which probably form the important conditions of cholecystolithiasis.

14 Boundedness of Solutions and Existence of Periodic Solutions for Autonomous Planar System

Yang Qigui Chen Junping

1997, 20(2):100-107.

[Abstract](639) [HTML](0) [PDF 293.34 K](958)

Abstract:
讨论一般的平面自治系统的解的有界性与周期解的存在性，得到了含有多个奇点的（１）的解的正向有界充要条件和存在周期解的充分条件，推广和改进了有关的结果。

15 Application of Fractal Theory in the Petroleum Gas Testing of Seismographical Channel

Duan Yurong Zheng Jiming

1997, 20(2):108-112.

[Abstract](669) [HTML](0) [PDF 256.78 K](971)

Abstract:
The seismographical channel is a chaotic time series.The trajectory of the motion of chaos in some region of the phase space via fold,torsion and stretch infinite times,constitutes a self similarity structure with infinite hierarchical imbeddings.We process the date of cross section of reflection point of the joint wells which are composed by the signals of the practical seismographical channel,using the method of reconstructing phase space (i.e. the Grassberger Procaccia algorithm) to compute the correlation dimension of each channel,and compared with the data of the practical drilling wells,and we explain the relationship between the correlation dimensions and the results of the drilling wells.They are agreeable quite well.

16 A New Method for Assessing Water Quulity

Lin Yan Gu Hengyue

1997, 20(2):113-116.

[Abstract](462) [HTML](0) [PDF 179.17 K](710)

Abstract:
A new method for assessing water quality is put forward by analyzing the shortage of the three present methods. The features of the new method are that the results of assessment coincide with the current standard of water quality in china,and that polluted degrels of water quality classification of assessment are also differentiated.

17 Numerical Simulation of Flow field and Temperature field in Combustion Chamber Widened Suddenly

Wu Chenbo Liang Xiaoping

1997, 20(2):117-122.

[Abstract](650) [HTML](0) [PDF 286.68 K](1202)

Abstract:
The flowfield and temperature field are numerically Simulated by the mathematical model of the fluid flow and heat transfer in circular combustion chamber widened suddenly. The distributions and influence factors of the flow field and temperature field are studied in it. The results have the guiding significance for the design of combustion chamber. The mathematical models can serve as the quantitative analysis methods for design.

18 The Effect of Additions in the Fermented Solution on Bubble Coalescence

Zhang Hongjing Zhou Zhaoyi

1997, 20(2):123-127.

[Abstract](440) [HTML](0) [PDF 252.58 K](789)

Abstract:
This paper presents a detail study of bubble coalescence in inorganic salts and organic compounds of fermented solution ,and preliminary analyses the principle of bubble coalescence.The experiments show that the relationship between the solute concentration and coalescence frequency reveals the existence of sharp transition concentration.

19 A New Approach for Obtaining the Laws of the potential in Electromagnetic Field

Hu Chenguo

1997, 20(2):128-132.

[Abstract](477) [HTML](0) [PDF 205.41 K](136)

Abstract:
从毕奥－萨伐尔定律出发，得到静磁学中矢势所满足的一些方程，然后利用狭义相对论的原理，获得了电磁场理论中电磁势所满足的系列方程。同样，又从库仑定律出发，得到静电学中标势所满足的一些方程，再利用相对论的原理，获得了电磁场理论中电磁势所满足的系列方程。

Home

Volume 20,Issue 2,1997 Table of Contents

Current Issue

Volume

Issue

Most Read

Most Cited

Most Downloaded