BOUNDARY ELEMENT METHOD FOR MULTI-BODY CONTACT PROBLEM AND ITS APPLICATION IN HUGE EXCAVATOR

A boundary integrate equation and its discrete technique for multi-body contact problem is carried out on basic equations of boundary element method and its fortran program is compiled. Using the method ,the press distribution on the roller plate of the huge excavator with capacity 16 m3 was calculated and a distroy stress analysis of caterpillar of the excavator was carried out.     

结构参数对水润滑橡胶合金轴承摩擦噪声的影响分析

为了研究水润滑橡胶合金轴承结构参数对其低速重载工况下摩擦噪声的影响,使用复模态分析方法建立了水润滑橡胶合金轴承系统仿真模型,采用专业仿真软件分析了不同摩擦系数及结构参数条件下摩擦噪声产生的概率,进而研究结构参数对摩擦噪声的影响,进行了平板型和圆弧型结构的水润滑橡胶合金轴承摩擦噪声的对比实验。研究结果表明,水润滑橡胶合金轴承的水槽半径大小、摩擦面形状以及摩擦副的摩擦系数对水润滑橡胶合金轴承的摩擦噪声有较大影响,而水槽的形状对轴承摩擦噪声的影响不大。对一定结构尺寸的水润滑橡胶合金轴承,水槽半径为4 mm、平面型摩擦面的结构可以大大减少轴承出现摩擦噪声的可能性,相关实验结果与计算结果是吻合的。     

The Component Type Choosing and Parameter Matching of ISA HEV

This paper briefly introduces the structure and main function of a mild hybrid system based on ISA. The components of the whole powertrain system include ISA,engine and battery. Transmission is choosed according to its typical configuration and functions. In addition,the specific parameters of power and torque of ISA,engine power,the number and capacity of battery,the gear ratio of gearbox are determined according to the required performance and fuel economy. In order to achieve the design target, the Genichi Taguchi method is used to optimize the gear ratio. At the same tine, the simulation of ISA mild hybrid vehicle is carried out and compared with conventional vehicle by using the ADVISOR software.     

新疆赛买提杏干营养成分的分析

采用温室型太阳能干燥装置对整粒和切分的新疆赛买提杏进行干燥研究并得到了较为理想的干燥参数,同时采用高效液相色谱法（HPLC）和原子吸收光谱法（AAS）测定了杏干中氨基酸和矿质元素种类与含量。共检测出17种氨基酸,其中包括7种必需氨基酸。除此之外,还对杏干中的水分、总糖、总酸、蛋白质、维生素c和胡萝卜素等营养成分进行了检测。检测结果表明,杏干中各种营养物质含量丰富,具有很高的食用价值。     

Desiqn Parameter Related to the Sensibility of Torsion Vibration Natural Frequency on 2300 Rolling Mill Main Transmission System

Based on the study of effec t of torsion vibration natrual frequency on rollingmill main transmission system , the sensibility formula of natural frequency related to design parameter is given,By the means of programming, analysis and calculation have been carried out on 2300rolling mill main transmission system,It provides theoretical asis for dynamic optimizing transmis sion svstems.     

Variation in vegetative parameters related to the nitrogen economy of wild barley,Hordeum spontaneum,in Israel

Summary Hordeum spontaneum, the wild progenitor of cultivated barley, has previously been examined in various studies as a germplasm resource in breeding for grain protein content and related nutritional traits.The nitrogen content and dry weight of leaf and stem (stem plus sheath) at anthesis, and the final grain size and grain protein content were measured in 33 H. spontaneum and two H. vulgare genotypes. H. spontaneum was generally higher in nitrogen content of leaves and stems, but lower in dry weight at anthesis. Consistent with previous reports, the H. spontaneum genotypes were considerably higher in grain protein than the cultivars. There was wide variation between and within populations of H. spontaneum suggesting that for breeding purposes lines combining high vegetative nitrogen content, dry weight and grain protein content can be selected.Incumbent of the Seagram Chair for Plant Science     

Optimal Design of Aerostatic Bearing

A method using fuzzy sets theory and optimization method in designing aerostatic bearings has been presented,which has solved the multiobjective optimal designing problems of aerostatic bearings and has obtained rational structure parameters,raised the efficiency of designing.The automation of aerostatic bearing design has been realized.     

Estimation of Earth Work Volume and Design Elevation in Large Earth Work

In this paper,the approximation calculation method based on calculation model of earthwork formula of tetragonal prism is described. The optimization design elevation in large earthwork can be determined by this method. Through introducing a set of different design elevations, the difference between and sum of the total excavation and the total fill can be calculated. An economical analysis is carried out on the design elevation chosen with little value for both cases by numerical values comparison. The elevation with the lowest cost is taken as the optimal design elevation.     

THE QUASI-FULL LOAD METHOD FOR OPTIMUM STRUCTURAL DESIGN

This paper presents the quasi-full load method, which has many advantages. Its thinking is simple and direct. Its program is easily carried out, its convergence rate is fast and the optimal result is safe, reliable, economical and practical. This paper gives the mathematical model of the space trusses optimum design in practical project, and points out the shortcomings of optimum method often applied by engineers. The method and the peculiarity of quasi-full load structural design are gone into details.     

THE OPTIMAL DESIGN CALCULATION OF te(MC)MEDIA FILTER

This paper introduces formula total water headloss of MC media filter anddiscusses the parameters of design calculation of MC media filter through the experiment.In the end,the optimal design calculation method and its program diagram are given.The method is important toguide the design of MC media filter.     

A NEW METHOD FOR DESIGN OF PSS PARAMETERS

The eigenvalue sensitivity methods is very useful not only in analysis of electric power system stability but also in design of the controllers. In this paper a new optimal method is proposed to design the parameters of PSS. Using this method the PSS is designed for a single machine-infinite bus system, and the results of digital simulation show that this method is very effective and useful.     

COMPUTER-AIDED ANALYSIS AND DESIGN FOR THE BASE STRUCTURE OF A MOVABLE TOWER CRANE

This paper is one of the achievements of the researchitem for computer-aided design of tower crane's steel structure.In thepaper,taking the well-base structure as an example,first the method establishing the mechanical model is explained for the base structure ofa movable tower crane.Then the math model of its optimal design andthe N-S figures for the computer program is described and calculatedusing discrete optimal technology.Finally the problems related to thedesign for the base structure of a movable tower crane are briefly illu-strated.     

稻麦两熟制条件下钵苗机插方式对不同类型水稻品种米质的影响

为探明钵苗机插方式在稻麦两熟地区对水稻米质性状的影响及其品种类型间差异,本文以常规粳稻、杂交籼稻和籼粳交水稻为材料,比较了钵苗机插、毯苗机插和机械直播3种种植方式在稻麦两熟制高产栽培条件下的稻米加工品质、外观品质、营养品质、蒸煮食味品质特性变化及其品种类型间差异。结果表明,钵苗机插的整精米率比毯苗机插和机械直播分别提高1.6%和4.9%(P0.05),整精米产量分别提高7.8%和25.9%(P0.05),改善了稻米加工品质;与毯苗机插和机械直播相比,钵苗机插的稻米垩白米率、垩白面积和垩白度显著增加,对稻米外观品质有不利影响,但钵苗机插精米蛋白质含量较高,有利于稻米营养品质的改良,其精米蛋白质产量分别比毯苗机插和机械直播提高8.7%和28.0%;3种种植方式相比,钵苗机插稻米蒸煮食味品质表现出一定程度的变优趋势,其中,稻米直链淀粉含量、消减值和糊化温度呈钵苗机插毯苗机插机械直播的趋势,胶稠度、峰值黏度、热浆黏度、最终黏度和崩解值呈钵苗机插毯苗机插机械直播的趋势;食味值于种植方式间无显著差异,呈籼粳交水稻和常规粳稻钵苗机插毯苗机插机械直播,杂交籼稻毯苗机插钵苗机插机械直播的趋势。由此得出,钵苗机插不仅能增加稻谷产量,还能改善部分稻米品质特征,是稻麦两熟地区实现高产高效优质协调水稻生产的潜力型机械化种植方式。     

THE FUZZY OPTIMIZATION DESIGN OF BOX EXPANSION ARM OF CRANE TRUCK

In this paper the section sizes of box expansion arm of crane truck are optimized in order that the weight of the arm will be the lightest on conditions that strength, rigidity, stability and size constraints are satisfactory. The fuzzy factors which influence design and the fuzziness of constraint conditions are considered. The unsymmetry mode of fuzzy optimization is established and solved by the method of optimal level cut set. Examples show that the effect is notable.     

APPLICATION OF RELATIVE EXCITATION TO MODAL ANALYSIS OF MACHINE TOOLS

The feasibility of treating relative excitation as sigle-point excitation is demonstrated by comparing the modal analvsis results of two types of gearhobbing machine. Two kinds of excitation tests are carried out on either cf the two machines and the close values of modal parameters are given by the HP5423A Structure Dynamics Analyzer, The transfer function of relative excitation developed in this paper is examined by synthesizing the modal parameters.     

大孔吸附树脂对虎杖中白藜芦醇的分离纯化研究

旨在筛选出分离纯化虎杖中白藜芦醇的最佳大孔吸附树脂以及工艺条件。静态吸附与解吸、动态吸附与解吸通相结合的方法,以树脂的最大吸附量、解析率为考察指标,确定最佳的纯化工艺。H103树脂对白藜芦醇有较好的吸附与解吸效果,其最佳的工艺条件为粗提液中白藜芦醇的质量浓度为0.72 mg/mL、上样流速2 BV/h,吸附饱和后先用4 BV的蒸馏水进行洗涤,然后用8 BV、75%的乙醇溶液以1.5 BV/h的流速进行洗脱,白藜芦醇的含量可由纯化前的12.8%提升至53.5%。应用H103树脂对虎杖中的白藜芦醇进行纯化,其工艺稳定可行,具有吸附快、解吸容易、解吸液安全低毒且回收容易,具有较高的应用价值。     

Parallel and Distributing Strategy to Solve Dynamic Characteristic of Complicated Mechanical Structure

The work device of hydraulic excavator is considered as subject investigated, the parallel and distributing strategy to solve dynamic characteristic of complicated mechanical structure is put forward. When computing process isinefficient can be overcome by using high performance computing technology. The strategy can provide an effective approach to carry out system mechanical product generalized optimize.     

Relationship between Seed Characters, Plant Growth and Yield Parameters of Phaseolus vulgaris

Legumes are an important component of the dietary pattern of the developing world. Thus optimal yields are a vital factor in agricultural production in these countries. Seed characters affect plant growth and yields of grain legumes. Due to the lack of similar studies in Phaseolus vulgaris (Frenchbeans), a study was carried out to determine the effect of seed characters on the growth cycle of frenchbean plants. Seed size was primarily determined by the size and weight of cotyledons and seed coat, as embryo size was similar in all seed classes. Seed size had no effect on seed viability, although larger seeds germinated earlier. There was a positive relationship between seed size and plant growth characters. Larger seeds developed plants with better growth and yield component parameters, resulting in higher yields. The importance of determining seed size in frenchbeans is presented.     

风电增速齿轮箱动力学性能优化方法

建立增速齿轮箱动力学分析有限元模型,利用Lanczos法求得齿轮系统的振动模态;以齿轮副时变啮合刚度激励、齿面综合误差激励和轮齿啮合冲击激励为内部作用激励,采用直接积分法求得箱体表面节点的动态响应。选取箱体上12个主要结构参数作为动力学性能优化的设计变量,齿轮箱体积为状态变量,以齿轮箱表面振动加速度的均方根值最小为动力学性能优化的目标函数,利用零阶与一阶优化算法求得最优设计变量。结果表明：优化前后箱体均不产生共振,且满足静力学条件;优化后目标函数减小37.5%,箱体各计算点的振动响应均有较大幅度的减小,最大减小量为54%。     

Modal Shape Analysis Methods of Machine Structure

The iterative Lanczos-reduce method for sensitivity analysis, the Guyan condensed method and the iterative synchronous vector methods in finite element modal are studied in order to solve the dynamic characteristic of complicated machine system. The primary reasons influenced on calculation precision are pointed out. The principia of master freedom for Guyan condensed method are put forward. The calculation precision of three methods is compared with the same standard finite element model. The iterative Lanczos-reduce method for sensitivity analysis is proved to be optimum analysis and the eigenvalue of arm in work device of hydraulic excavator in finite element model is solved with iterative Lanczos-reduce method for sensitivity analysis. The theory basis is provided for reasonable choose to solve the dynamic of complicated machine structure.