Geological adaptability matching design of disc cutter using multicriteria decision making approaches

Geological adaptability matching design of a disc cutter is the prerequisite of cutter head design for tunnel boring machines(TBMs)and plays an important role in improving the tunneling efficiency of TBMs.The main purpose of the cutter matching design is to evaluate the cutter performance and select the appropriate cutter size.In this paper,a novel evaluation method based on multicriteria decision making(MCDM)techniques was developed to help TBM designers in the process of determining the cutter size.The analytic hierarchy process(AHP)and matter element analysis were applied to obtaining the weights of the cutter evaluation criteria,and the fuzzy comprehensive evaluation and technique for order performance by similarity to ideal solution(TOPSIS)approaches were employed to determine the ranking of the cutters.A case application was offered to illustrate and validate the proposed method.The results of the project case demonstrate that this method is reasonable and feasible for disc cutter size selection in cutter head design.

REVERSE DESIGN APPROACH FOR MECHANISM TRAJECTORY BASED ON CODE-CHAINS MATCHING

Aiming at the problem of reverse-design of mechanism, a method based on the matching of trajectory code-chains is presented. The motion trajectory of mechanism is described with code-chain, which is normalized to simplify the operation of geometric transformation. The geometric transforma-tion formulas of scale, mirror and rotation for trajectory code-chain are defined, and the reverse de-sign for mechanism trajectory is realized through the analysis and solution of similarity matching between the desired trajectory and the predefined trajectory. The algorithm program and prototype system of reverse design for mechanism trajectory are developed. Application samples show that the method can break the restriction of trajectory patterns in matching, meet the demand of partial match-ing, and overcome the influence of geometric transformation of trajectory on the reverse design for mechanism.

BIMATCHING DESIGNS

A collection of k-matchings of bipartite graph Kn,n with the property thatevery pair of independent edges lies in exactly λ of the k-matchings is called aBIMATCH(n,k,λ)-design. Existences and constructions for various BIMATCH (n,k,λ)designs are given.

REQUIREMENTS AND DESIGN METHOD FOR MATCHING AIRCRAFT GUNS WITH THEIR SUPPORTING STRUCTURE

In aircraft structural dynamic design the matching of guns with their supporting structure is one of the most important tasks on which hinges the success or failure of the structural design. The design curves for matching guns with their supporting structure can be obtained from response calculations of the plate-spring system supporting the gun on the ground,the model structure tested on the ground and the actual structure.A set of matching curves is given for engineering application.Then,the matching design can be accomplished by means of impact load spectrograms so as to perform an optimal structural design and to make further improvements on dynamic design program.

Cumulative logit model in the analysis of endometrial cancer under a matched pair case-control design

Background: Binary as well as polytomous logistic models are widely used for estimating odds ratios when the exposure of prime interest assumes unordered multiple levels under matched pairs case-control design. In our previous studies, we have shown that the use of a polytomous logistic model for estimating cumulative odds ratios when the outcome (response) variable is ordinal (in addition to being polytomous) under matched pairs case-control design. The cumulative odds ratios were estimated based on separate fitting of the model at each of the cutpoint level as compared to less than equal to that level. In this paper we propose an alternative method of estimating the cumulative odds ratios and reanalyze the Los Angeles Endometrial Cancer data in the context of dose levels of conjugated oestrogen exposure and development of endometrial cancer under the matched pair case-control design. Methods: In the present study, the cumulative logit model is fitted using a single multinomial logit model for the data. For this, the full maximum likelihood estimation procedure is adopted. A test for equality of the cumulative odds ratios across the exposure levels is proposed. Results: The analysis revealed that there is a strong evidence of risk for developing endometrial cancer due to oestrogen exposure above each of the three dose level as compared to less than equal to that level. The estimated values at the three cutpoint levels were found to be 6.17, 3.60 and 5.16 respectively. Conclusions: The odds of developing endometrial cancer are very high for the users of any amount of oestrogen, even if it is the least dose, as compared to the non-users.

Shape design of the reinforcement for bending load-carrying capacity of under-matched butt joint under four-point bending load

To improve the bending load-carrying capacity （ BLCC） of under-matched butt joint under four-point bending load in the elastic stage, the shape design of the reinforcement is studied based on the theoretics of mechanics of materials. The concept, criterion, realization condition and design proposal of equal bending load-carrying capacity （EBLCC） are put forward. The theoretical analysis results have been verified by the finite element method. The simulation results are coincident basically with the ones of theoretical analysis. The research results show that the shape design of the reinforcement of EBLCC can improve BLCC of under-matched butt joint and the unilateral-side type reinforcement can replace double-side symmetry

数学对服装色彩的匹配与调和的影响

在服装设计中,色彩的选择主要依靠设计师的直觉与经验,带有一定的主观性与不确定性,但在科学技术的发展以及多学科交叉领域的不断发展下,运用数学可以在服装设计中进行合理的颜色匹配与调和,可以有效提升产品的品质。因此,针对数学对服装色彩的匹配与调和的影响展开探究,以期为服装设计师提供理论参考。

叶轮与导叶宽度匹配参数对LNG泵压力脉动特性的影响研究

应用CFD技术研究了叶轮和导叶宽度匹配设计对LNG潜液泵压力脉动特性影响,进行了宽度匹配设计,采用K-epsilon湍流模型进行了多工况数值模拟,引入无量纲参数R(导叶进口宽度/叶轮出口宽度)进行结果分析,分析验证了泵的外特性,得到了LNG泵的时、频域压力脉动特性等。结果表明:压力脉动主频为叶轮的叶频,次频为其倍频。时域峰值与监测点处的相对位置有关,相对于交界面越近,时域峰值越大。压力脉动幅值随R增加先减小后增大,存在最佳宽度匹配方案使得泵压力脉动峰值降低。

数智时代科技成果供需对接机制

为探究我国数智时代科技成果供需对接影响因素和机制作用,梳理我国科技成果供需对接模式及演变历程,构建科技成果供需对接影响因素概念模型,运用扎根理论和文献分析方法归纳出供方、需方、平台、政策、资金和技术因素等影响因素,运用DEMATEL方法分析影响因素之间的影响度。基于分析结果,提出我国科技成果供需对接机制为从应需引供模式转变为掘需育供模式,从上下游关系转变为共同体关系,从局域平台转变为广域平台,从信息化转变为智慧化,从单点服务转变为全链条服务,从技术发展转变为多要素融合发展。

4~18 GHz超宽带行波管输能系统设计

为满足新一代电子对抗装备对跨频带超宽带行波管的需求,本文针对4~18 GHz超宽带大功率行波管输能系统开展了匹配优化设计和功率容量分析研究。从同轴窗、同轴输能结构及输能结构与高频结构匹配等几方面综合优化,设计出输入驻波比优于1.53、输出驻波比优于1.55的输能系统,与测试结果对比表明设计方法合理,输能系统和器件匹配成功;针对输出系统的功率容限问题,从峰值功率和平均功率两方面分析了输能窗的电可靠性和热可靠性,制管实测结果表明,该输能系统能够满足行波管应用要求。

125ksi超级马氏体油管成分-组织-性能-工艺综合控制技术

125ksi钢级15Cr超级马氏体不锈钢具有优良的高强度、高韧性匹配与耐CO_(2)腐蚀性能,是深度>7000 m深井油井管的候选材料。从成分设计、生产工艺、组织调控等方面,论述了15Cr超级马氏体不锈钢油管的高强高韧综合控制技术。成分控制方面,采用无δ铁素体成分设计,w[Cr]取15%,w[Ni]取6.5%~7%,w[C]取0.01%~0.03%,w[Cu]取1.25%~1.5%,Cr、Ni元素合理匹配是降低δ铁素体含量的主要因素,C、Cu含量的合理匹配是获得高强高韧力学性能的关键因素。冶炼工艺方面,研究了电弧炉钢杂质元素的影响,结果表明,V、N、Al杂质元素会增加15Cr钢的硬度,将回火温度提高至550~575℃,能够降低硬度保证韧性。热加工成型方面,通过热变形试验,获得了15Cr钢的动态再结晶规律,制定了无缝管热穿孔成型变形温度1100~1150℃,能够获得细小的再结晶晶粒。组织性能调控方面,通过热处理工艺研究,确定了正火温度采用950~980℃,即能保证晶粒尺寸不明显长大,又能获得高强度与高韧性的匹配。

基于MATLAB的射频微波电路阻抗匹配教学软件设计

阻抗匹配是射频微波电路设计的重要内容,然而阻抗匹配方案众多且计算繁杂,原有教学大多以中心频率匹配的数学公式推导为主,学生难以理解不同匹配方案在较宽频带内的整体性能表现。为此,基于MATLAB App Designer开发了一款阻抗匹配设计和分析软件,可实现包含集总参数电感电容和分布参数微带线在内的多种宽带、窄带匹配方案,通过输入技术指标要求便可直接得到对应的电路结构、元件值以及S参数曲线。该软件操作简单、实时性强,可快速比较多种匹配方案的性能,加强学生对阻抗匹配的深层次理解,极大地辅助了教学和科研。

薄膜柔性基板与刚性太阳电池电路匹配性设计及验证

空间用太阳电池阵根据基板的类型分为刚性太阳电池阵、半刚性太阳电池阵、柔性太阳电池阵。针对折叠式柔性太阳电池阵柔性基板易变形的特点,提出了一种基于柔性基板与刚性太阳电池匹配性设计及验证方法。该方法通过对柔性太阳电池阵各层的热变形进行仿真计算,得出地面环境模拟验证试验的输入条件并据此开展试验验证,从而实现基板与电池匹配性设计及验证。

配对设计中风险差的置信区间构造

风险差在配对设计中常用来对比某种疾病治疗前后或某种政策措施实施前后的有效性.文中针对风险差(Risk Difference)在配对设计中的置信区间估计问题,利用Delta法,改进Wald法,反双曲正切变换法,似然比检验法,鞍点逼近法方法进行置信区间构造,并通过Monte Carlo模拟计算区间覆盖率和区间长度,以比较这5种方法的表现性能.结果显示:不同方法的区间表现均不相同.其中鞍点逼近法明显优于其他4种方法;改进Wald法的表现仅次于鞍点逼近法,且随着样本量的增大,改进Wald法和反双曲正切变换法的性能差距逐渐减小;最后通过一个实例来验证这5种区间估计方法.

混合动力商用车制动系统的匹配设计

混合动力商用车制动系统是在传统燃油车的基础上将燃油制动系统转变为燃油、纯电模式的混合动力制动系统的过程。文章详细阐述了混合动力制动系统的压缩空气管路,电控空压机、电控空气干燥器、电控制动总阀及管线的匹配设计。通过匹配设计,搭载整车进行试验验证的过程及应用。

流行趋势下软包沙发配色设计

随着社会生活水平日益提高、经济飞速发展,人们的价值观、生活观和审美观等都随之发生了变化,用户不再只是注重产品物理机能的理性需求,而是更加注重产品能否满足审美情趣的心理需求。沙发作为家居环境中体量较大且使用时间较长的家具类型,充当着客厅空间的视觉与活动中心,沙发的风格和色彩对室内空间氛围的营造起着举足轻重的作用。家具展代表着家具行业的流行趋势,以家具面料展官网高清面料图片为研究样本,利用k-means聚类算法提取家具面料流行色,基于伊登的色彩调和理论和蒙赛尔色彩面积调和理论分别从色相、明度和饱和度维度进行色彩调和搭配,并以沙发产品为例进行设计实践。

浅谈地域文化在动画设计中的应用与实践

我国地域文化体系本身具有较强的亲和力和感染力,其在我国动画设计领域中也起到不可替代的作用。设计者应正确把握地域文化与动画设计之间的关联,从造型艺术、民间曲艺、民间工艺、民间故事、色彩搭配等角度着手深化地域文化在动画设计中的应用,重点分析地域文化在动画设计中的实践,为我国动画产业发展注入鲜活的地域文化元素,进一步推动我国创新文化产业的可持续发展。

产品匹配信息揭露与产品线设计

探究顾客对产品匹配信息不确定下,垄断企业的信息揭露策略与产品线的质量设计.首先分析企业对产品匹配信息的揭露策略如何影响产品线的质量设计,进而探讨企业在哪些情形下会揭露产品的匹配度信息.为探究这些研究问题,构建了一个垄断企业向高估值顾客和低估值顾客销售高端产品和低端产品的模型.研究发现,企业应根据产品匹配度信息的披露策略对应地调整产品线的质量设计.具体而言,相较于不揭露产品信息,如果只揭露高(低)端产品的匹配度信息,低端产品的质量设计应向上提升(向下扭曲),高端与低端产品的质量设计差异减少(增加);如果同时揭露高端和低端产品的匹配度信息,低端产品质量设计的扭曲程度取决于不同类型顾客认为产品合适的概率.另外,企业如何选择产品匹配度信息的揭露策略取决于市场特征.当低估值顾客对产品水平维度的认知价值较高时,企业倾向于只揭露低端产品的匹配度信息.本研究为广大电商的信息披露与产品线设计的联合决策提供重要的管理学启示.

新媒体背景下视觉传达设计中色彩发展趋势

探索新媒体时代视觉传达设计中色彩的发展趋势,提高设计中色彩的合理性。分析色彩在视觉传达领域的重要作用,引出新媒体大背景环境下色彩应用在视觉传达设计中的地位,并以动态海报设计、UI设计、标志设计的实际出发,分析色彩在其中的变化方法及原理。得到色彩在新媒体时代视觉传达设计中的发展趋势。无论是在什么时期,色彩在视觉传达设计中都是必不可少的元素,通过时代的变化,色彩应用于新媒体技术上,色彩表现方法与内容也更加丰富,但这更需要设计师时刻警醒自己运用好色彩,提升视觉传达设计在新媒体领域的潜力。

氢燃料电池整车动力系统参数匹配方法研究

燃料电池整车动力匹配在燃料电池整车研发设计中属于十分重要的一环,直接关系到燃料电池整车动力性和经济性,但目前市面上暂无成熟的动力系统参数匹配方法。基于上述情况,结合已开发的全功率和混合动力架构车型,以整车指标为基础,结合动力学理论以及测试经验,提出燃料电池汽车动力系统参数匹配方法,并选择全功率和混合动力车型进行实车验证,进一步证实了该整车动力匹配方法的合理性,对燃料电池整车动力匹配集成以及参数选型有较好的借鉴意义。