Optimization Design and Comprehensive Evaluation of Screw Contact of Space Battery Based on ANSYS

In order to improve the safety of the battery of satellite side mounting,and prevent the screw from producing excess due to frequent assembly and disassembly,the YS-20 material replacement and structure optimization design of the screw body are carried out under the premise of not changing the original tooling.The double⁃shear test of YS-20 bar is carried out,and the ANSYS optimization design module is used to design 7×7×6,a total of 294,calculation cases of D1,D2,T,the three important dimension parameters of screw structure.The actual bearing state of screw composite structure is accurately simulated by using asymmetric contact model.Three comprehensive evaluations are established,and the calculation examples satisfying the conditions are evaluated comprehensively.The final results are T=12.2 mm,D1=16 mm,D2=2 mm.The stress verification and contact analysis are carried out for the final scheme and the bearing state and contact state optimized screw structure are obtained.

Optimization design of deep lean-ore mining and safety evaluation

In order to settle the mining optimization design and safety problem of the above 1 150 m pillar of No.1 ore-body in No.H Mining Jinchuan, the lean-ore above 1 250 m, the 1 150 m horizontal pillar and the ore-body below 1 100 m regarded as research objects based on the original design project, and nine calculation schemes on different mining sequence and different fill body strength were put forward based on cement-sand ratio of 1 ： 4, 1： 12 and 1 ： 24. Calculation parameters were got by the back analysis method of field monitoring data, and the FLAC2D program was applied to compute for these schemes, stress and displacement of ground settlement, shaft and stope roof were analyzed, and some conclusions were got. Results show that the intensity of filling body and the mining technique have very important effect on controlling settlement and stability of surrounding rock; Developing of lean ore have some influences to the 16th return air filling shaft, especially for 1 500--1 400 m of the shaft; The best project is the first project. This research supply some technique references and safety appraisals for the mining of lean-ore of No.II Mining Jinchuan.

Frequency Weighting Filter Design for Automotive Ride Comfort Evaluation

Few study gives guidance to design weighting filters according to the frequency weighting factors,and the additional evaluation method of automotive ride comfort is not made good use of in some countries.Based on the regularities of the weighting factors,a method is proposed and the vertical and horizontal weighting filters are developed.The whole frequency range is divided several times into two parts with respective regularity.For each division,a parallel filter constituted by a low-and a high-pass filter with the same cutoff frequency and the quality factor is utilized to achieve section factors.The cascading of these parallel filters obtains entire factors.These filters own a high order.But,low order filters are preferred in some applications.The bilinear transformation method and the least P-norm optimal infinite impulse response（IIR） filter design method are employed to develop low order filters to approximate the weightings in the standard.In addition,with the window method,the linear phase finite impulse response（FIR） filter is designed to keep the signal from distorting and to obtain the staircase weighting.For the same case,the traditional method produces 0.330 7 m · s^–2 weighted root mean square（r.m.s.） acceleration and the filtering method gives 0.311 9 m · s^–2 r.m.s.The fourth order filter for approximation of vertical weighting obtains 0.313 9 m · s^–2 r.m.s.Crest factors of the acceleration signal weighted by the weighting filter and the fourth order filter are 3.002 7 and 3.011 1,respectively.This paper proposes several methods to design frequency weighting filters for automotive ride comfort evaluation,and these developed weighting filters are effective.

HIT-SEDAES: An integrated software environment for simulation experiment design, analysis and evaluation

Simulation is a powerful technique in evaluating and improving the performance of complex systems.In order to improve the efficiency of simulation experiment design,analysis and evaluation,auxiliary tools are required.Unfortunately,existing tools are usually not meeting the requirements of simulation.Moreover,the restricted interfaces,reusability and expandability influence their efficiency to a certain extent.In this paper,an integrated software environment,HIT-SEDAES,is designed for solving these problems.A process model of simulation experiment design,analysis and evaluation is introduced to guide the development of the software environment.And several solutions are proposed to solve key problems in this development.Finally,an application is used to illustrate how the software environment works for the problems of model validation,effectiveness evaluation and performance analysis.

The Study of Optimizing Reservoir Model Using Experimental Design in Stochastic Models

In response to the main problems in commonly used model selection methods,a method was proposed to apply the concept of experimental design to the optimization of uncertain reservoir models.Firstly,based on the actual situation of the oil field,the uncertain variables were determined that affect the geological reserves of the model and their possible range of variation,and experimental design was used to determine the modeling plan.Then,multiple geological models were established and reserves were calculated,and multiple regression was performed between uncertain variables and the corresponding geological reserves of the model.Finally,Monte Carlo simulation technology was applied to determine the parameters of the P10,P50,and P90 models for probabilistic reserves,and P10,P50,and P90 models were established.This method is not only more objective and time-saving in the application process,but also can determine the main geological variables that affect geological reserves,providing a new idea for evaluating the uncertainty of geological reserves.

Mathematical Model of Weight in Evaluation System

Having studied the property of compare matrix, this paper establishes a mathematical model of minimizing the sum of Euclidean norm (SEN) by means of the least square method. It is proved that the non linear program model can be transformed into linear a

Architecture-level performance/power tradeoff in network processor design

Network processors are used in the core node of network to flexibly process packet streams. With the increase of performance, the power of network processor increases fast, and power and cooling become a bottleneck. Architecture-level power conscious design must go beyond low-level circuit design. Architectural power and performance tradeoff should be considered at the same time. Simulation is an efficient method to design modem network processor before making chip. In order to achieve the tradeoff between performance and power, the processor simulator is used to design the architecture of network processor. Using Netbeneh, Commubench benchmark and processor simulator-SimpleScalar, the performance and power of network processor are quantitatively evaluated. New performance tradeoff evaluation metric is proposed to analyze the architecture of network processor. Based on the high performance lnteI IXP 2800 Network processor eonfignration, optimized instruction fetch width and speed ,instruction issue width, instruction window size are analyzed and selected. Simulation resuits show that the tradeoff design method makes the usage of network processor more effectively. The optimal key parameters of network processor are important in architecture-level design. It is meaningful for the next generation network processor design.

基于MATLAB App Designer的牵引电机滚动轴承可靠性评估系统设计

牵引电机滚动轴承在运行过程中由于存在载荷不均匀和运行环境恶劣的问题,需要评估地铁车辆牵引电机滚动轴承的可靠性。文中基于MATLAB App Designer对牵引电机滚动轴承可靠性评估系统进行了设计开发。通过提取振动信号的时域、频域特征指标,利用主成分分析法进行特征融合。将融合后的特征指标作为威布尔比例故障率模型的响应协变量,采用飞蛾扑火优化算法寻优威布尔比例故障率模型参数,代入到可靠度函数计算出任意时刻可靠度。使用MATLAB App Designer创建数据录入、数据分析和可靠性评估等模块界面。实验结果表明,所设计的牵引电机滚动轴承可靠性评估系统界面友好、易于操作、可靠性评估效果良好,可广泛应用于不同领域。

Rough Set Fuzzy Optimum Selecting in Multidisciplinary System

Scheme evaluation and selection is an optimum selecting and sequencing problem with multi-objective and multi-level. It can’t follow single objective function or rule. Meanwhile,these objectives are coupled with each other and the attribution information is fuzzy also. It is necessary to find an effective evaluation method which can consider all conditions and restrictions. In this paper,AHP and rough set theory are applied to fuzzy optimization to determine important weight of each attribution. The rough set fuzzy optimum selection is used to eliminate the useless information. Autonomous underwater vehicle (AUV) is large-scale systems with many coupled design variables and objective functions. Their scheme evaluation and selection are very important,which relate to multiple factors,such as reliability; security,service time; the lifecycle,etc. Results of application in torpedo design indicate that this method is feasible.

Judgement of Design Scheme Based on Flexible Constraint in ICAD

The conception of flexible constraint is proposed in the paper. The solution of flexible constraint is in special range, and maybe different in different instances of same design scheme. The paper emphasis on how to evaluate and optimize a design scheme with flexible constraints based on the satisfaction degree function defined on flexible constraints. The conception of flexible constraint is used to solve constraint conflict and design optimization in complicated constraint based assembly design by the PFM parametrization assembly design system. An instance of gear box design is used for verifying optimization method.

Optimization of Selecting Air Conditioning Cold/Heat Sources with Grey Relation Analysis

Selection of air conditioning（AC） cold/heat sources generally concerns about certain aspects and cannot reveal the whole profile of the problems. Grey relation analysis （GRA） is a data processing method to categorize the correlation extent of compared sequences and a certain reference sequence in a system with uncertain information. It is applied to evaluating and selecting AC cold/heat sources from four main aspects, which are technology, economy, reliability, and operation and management. Case study shows that the result for selecting AC cold/heat sources with the GRA method can be more reasonable and convincible. Thus it offers a new approach for designers in heating, ventilating and air conditioning field to compare and evaluate different AC cold/heat sou rces.

Research on integrated naval ship design model and its intelligent algorithm

Pointing at naval ship projects creation and evaluation at stage of naval ship concept design,in the mechanism of integrated design based on naval ship synthesis model,ship projects creation and intelligent fuzzy evaluation method is researched,thus the applicability of each algorithm is obtained.Firstly,the naval ship synthesis model is introduced to design process,value and application status of synthesis model in integrated design is then exposed.Then the applicability of single target and multi targets SA algorithm is improved,and the quick generation of naval ship projects is done.After that,multiple projects evaluation method based on Vague fuzzy set is introduced to established the intelligent evaluation model,which can integrate effectively the quantitative and qualitative indexes.At last,the analysis of results comparison shows the advancement and rationality of each method.The example shows the integrated design process researched in this paper can be a great orientation of naval ship project design,and can also be used in other parts of naval ship development.

感知价值视角下移动医疗问诊系统设计评价与优化

文章从感知价值视角对移动医疗问诊系统设计进行评价,研究设计要素优先级,探讨优化设计方法。首先,采用层次分析法构建基于感知价值5个维度的移动医疗问诊系统设计评价体系,计算出评价指标的权重和评价公式。其次,依据设计要素的重要性,优化移动医疗问诊系统。最后,通过李克特量表获取30份优化前后两个设计方案的评价数据,对比评价结果。评价数据表明:基于感知价值的设计评价方法具有可行性和有效性,为移动医疗问诊系统指明了设计重点,明确了设计目标。移动问诊系统设计评价体系的建立避免了设计过程的主观性,未来该系统的设计开发可从功能价值、情感价值、效率价值、知识共享价值、信任价值5个维度的设计要素入手,全方位提高用户的感知价值。

面向综合评估的船舶工装设计方法

针对船舶建造工装设计标准化程度低、设计不规范以及设计管理落后等问题,提出一种面向综合评估的工装设计方法。从工装库构建、智能设计、仿真评估与优化等角度开展工装数字化设计研究。基于工装模型库实现设计模型的有效管理和调用,并通过集成寻优算法实现工装最优布局,在此基础上基于有限元仿真和工艺仿真技术,结合具体指标,实现工装结构力学性能和工艺仿真评估,同时利用结构优化技术对设计结果进行优化,在满足使用需求的基础上降低了加工成本。基于达索三维体验平台开发数字化工装设计系统,固化设计流程,并通过分段吊马设计的实际应用,实现设计效率提升200%,同时重量减轻12.8%。

考虑绿色属性的改进原子聚类模块划分方法

针对企业传统模块化设计产品制造或使用时资源消耗高、故障率高、不易维护等问题,提出了一种考虑资源利用性、寿命兼容性、可维护性等绿色属性的改进原子聚类模块划分方法。通过构建多重绿色约束矩阵、价矩阵和距离矩阵,计算各部件间库仑力关系进而提出模块划分方案。利用RAHP、CRITIC和VIKOR法等建立综合评价体系,考虑模块平均聚合度、耦合度和成本均衡度等指标,对模块划分方案进行选择和优化。以工业汽轮机企业产品为例进行绿色模块划分,并与传统模块划分方法进行对比。结果表明,改进后的原子聚类模块划分方法有效提升了产品的绿色性能,满足绿色设计需求。

长岭断陷龙凤山气田致密凝析气藏CO_(2)吞吐效果评价

长岭断陷龙凤山气田致密凝析气藏产量递减快,采出程度低,为了减弱近井地带反凝析污染现象和凝析油采出困难的开发难题,通过数值模拟方法和注CO_(2)吞吐实验,分析评价CO_(2)吞吐效果,探讨提高气井产量和气藏采收率的方法。结果表明:与注干气吞吐相比,致密凝析气藏注CO_(2)吞吐更能较为有效地解除反凝析污染;气井反凝析分为反凝析初期(对生产基本无影响)、反凝析加重(对油生产有影响)、反凝析严重(对油气生产影响大)、极端反凝析(几乎不出油)共4个阶段;不同反凝析特征阶段的气井CO_(2)吞吐机理和目的不同,CO_(2)吞吐参数应当相应优化。现场实施表明,注CO_(2)吞吐的5口井在吞吐前处于不同的反凝析阶段,吞吐后取得了快速增加地层能量、解堵近井地带反凝析污染、提高注入能力、增加凝析油和天然气产量等效果。研究成果可为CO_(2)吞吐技术在致密凝析气藏的规模应用提供了经验。

南海深水FPSO模块支墩设计与分析

针对中国南海海况恶劣,浮式生产储卸油装置(Floating Production Storage and Offloading,FPSO)在南海服役多年后,少数支墩由于建造工艺出现裂纹问题,以南海某深水FPSO为研究对象,对常用箱式支墩形式进行改进优化设计。运用有限元方法对箱式模块支墩和改进后的丰字形模块支墩与十字交叉带裙边支墩进行评估,对不同支墩形式进行强度分析、变形分析和疲劳分析,并对不同支墩的工艺进行综合对比,结合工程实践和有限元计算,给出支墩推荐设计方案。结果表明,优化后的十字交叉带裙边支墩结构强度和疲劳均优于箱式支墩,同时还具有便于加工组装的特点,最终选定十字交叉带裙边支墩方案。

低渗透油藏注CO_(2)混相驱及CO_(2)埋存评价

注CO_(2)开发低渗透油藏不仅能增加原油采收率,还能将CO_(2)埋存在地下,实现双赢。为了明确X低渗透油藏注CO_(2)混相驱油机理、CO_(2)在地层中的运移规律以及埋存机理,利用实验和数值模拟相结合的方法,从注CO_(2)混相特征、注CO_(2)参数优化和CO_(2)埋存评价3方面对X低渗透油藏进行研究。结果表明:地层原油注CO_(2)最小混相压力为26.03 MPa,CO_(2)有降低原油黏度和密度的作用;通过参数优化确定的推荐注采方案与衰竭开采相比,累计增油量为96.21×10^(4)t,主力开发层系X4⁃2、X4⁃3提高采收率分别为9.37百分点、6.02百分点;CO_(2)注入地层后,随着时间的推移,在平面上不断向四周扩散,在纵向上受重力分异的作用向上运移;评价区块注CO_(2)驱推荐方案预计CO_(2)埋存量为68.08×10^(4)t,其中构造埋存量、束缚埋存量、溶解埋存量和矿化埋存量分别为42.20×10^(4)、17.79×10^(4)、6.24×10^(4)和1.85×10^(4)t。研究成果为低渗透油藏注CO_(2)驱及CO_(2)埋存提供了实验和理论的借鉴意义。

铰接式基础风力机多目标优化及动力响应研究

针对一种新型铰接式基础风力机的基础结构设计与优化问题,综合考虑风力机运行安全稳性、经济成本及运动性能等多方面因素,本文建立了高维三目标优化数学模型,采用一种基于参考点的非支配排序多目标遗传算法(NSGA-Ⅲ)对风力机基础结构尺寸进行优化设计研究,利用模糊优选方法,对所得到的帕累托解进行模糊评价,得到满足不同评价指标下的最优方案;并在此基础上,采用空气动力-水动力-结构耦合分析方法,利用Matlab在时域内编写运动控制方程进行动力响应分析。计算结果表明:额定风速海况下,所设计的铰接式基础风力机满足安全发电作业要求,同时相比于初始设计方案,基于多目标优化算法及模糊评价所设计的基础结构无论是运动及载荷性能都更加优越,经济成本更低;相关算法及优化流程也为后续不同基础形式的优化设计工作提供了新思路和参考。

动力电池绿色设计综述

随着新能源汽车的迅速发展,动力电池也实现了大规模开发和应用。然而,动力电池快速发展造成电池资源短缺,能源消耗过快,电池报废也对环境产生了不利影响。动力电池产品的绿色设计是解决其一系列问题的有效手段之一。通过综述大量文献,分析了绿色设计评价方法和绿色设计方法,对当前动力电池绿色设计现状和发展进行了分析和概述。结果表明:动力电池主动式绿色设计策略相较于被动式绿色设计策略,经济性更好、资源利用率更高且能耗更低,更具发展潜力。