摘要：This paper presents the design of a computational software system that enables solutions of multi-phase and multi-scale problems in mechanics. It demonstrated how mechanicians can design “process-driven” software systems directly, and that such efforts are more suitable in solving multi-phase or multi-scale problems, rather than utilizing the “data-driven” approaches of legacy network systems. Specifically, this paper demonstrates how this approach can be used to solve problems in flexible dynamics. Then it suggests a view of mechanics algorithms as ‘state equilibrium’ enforcers residing as servers, rather than as computer programs that solve field equations. It puts forth the need for identical input/output files to ensure widespread deployment on laptops. Then it presents an assessment of the laptop platform. A software system such as the one presented here can also be used to supply virtual environments, animations and entertainment/education software with physics.

摘要：The smoothed finite element method (S-FEM) was originated by G R Liu by combining some meshfree techniques with the well-established standard finite element method (FEM). It has a family of models carefully designed with innovative types of smoothing domains. These models are found having a number of important and theoretically profound properties. This article first provides a concise and easy-to-follow presentation of key formulations used in the S-FEM. A number of important properties and unique features of S-FEM models are discussed in detail, including 1) theoretically proven softening effects;2) upper-bound solutions;3) accurate solutions and higher convergence rates;4) insensitivity to mesh distortion;5) Jacobian?free;6) volumetric-locking-free;and most importantly 7) working well with triangular and tetrahedral meshes that can be automatically generated. The S-FEM is thus ideal for automation in computations and adaptive analyses, and hence has profound impact on Al-assisted modeling and simulation. Most importantly, one can now purposely design an S-FEM model to obtain solutions with special properties as wish, meaning that S-FEM offers a framework for design numerical models with desired properties. This novel concept of numerical model demand may drastically change the landscape of modeling and simulation. Future directions of research are also provided.

摘要：The method of determining coal pillar strength equations from databases of stable and failed case histories is more than 50 years old and has been applied in different countries by different researchers in a range of mining situations. While common wisdom sensibly limits the use of the resultant pillar strength equations and methods to design scenarios that are consistent with the founding database, there are a number of examples where failures have occurred as a direct result of applying empirical design methods to coal pillar design problems that are inconsistent with the founding database. This paper explores the reasons why empirically derived coal pillar strength equations tend to be problem-specific and should be considered as providing no more than a pillar strength ‘‘index." These include the non-consideration of overburden horizontal stress within the mine stability problem, an inadequate definition of supercritical overburden behavior as it applies to standing coal pillars, and the non-consideration of overburden displacement and coal pillar strain limits. All of which combine to potentially complicate and confuse the back-analysis of coal pillar strength from failed cases. A modified coal pillar design representation and model are presented based on coal pillars acting to reinforce a horizontally stressed overburden, rather than suspend an otherwise unstable self-loaded overburden or section, the latter having been at the core of historical empirical studies into coal pillar strength and stability.

摘要：In this paper, the aerobic metabolism mechanism of Aspergillus Niger （AS 3.3 50 ）, which is the most suitable bacteria for degumming kenaf fiber, is expounded, and macromolecular structure of pectin is also analyzed. The fracture position of the macromolecular chain of kenaf pectin and its outgrowth structure, affected by Endo-PG and Exo-PG are secreted by AS 3. 350 and explored in molecule scale. The optimal value of degumming parameters are fixed： temperature 34 - 36℃, time 48 - 50 h, pH 6.5 - 7.5. Compared with kenaf fibers obtained by natural method, the ones deguntmed by bio-enzymatic method possess of smoother surface, .better. Separation, less impairment and higher strength with. residual pectin percentage of 14.5 %.

摘要：This paper presents methods of orbit transfer for small planetoids from the main belt to the future colonies on Mars using current technologies. The results show that by using nuclear weapon or even kinetic energy weapon (for retrograde bodies) asteroids with masses up to about 100 tons can be moved. Both options assume that asteroid will survive explosion.

摘要：A knowledge-based system in structural component design based on fracture mechanics is developed in this paper. The system consists of several functional parts: a general inference engine, a set of knowledge bases and data-bases, an interpretation engine, a bases administration system and the interface. It can simulate a human expert to make analysis and design scheme mainly for four kinds of typical structural components widely used in shipbuilding industry: pressure vessels, huge rotation constructions, pump-rod and welded structures. It is an open system which may be broadened and perfected to cover a wider range of engineering application through the modification and enlargement of knowledge bases and data-bases. It has a natural and friendly interface that may be easily operated. An on-line help service is also provided.

摘要：减振抗冲是足式机器人控制研究的重要难题,使用主被动联合减振抗冲的方法可以对足式机器人的振动冲击进行很好的抑制。文章首次将主被动联合抗冲减振控制方法应用到足式机器人的减振控制中,通过建模分析,设计了被动减振单元的刚度和阻尼比,实现了对冲击振动中的高频信号的衰减,然后根据被动减振结果设计合理的主动控制方案,进一步减小了冲击振动中的低频振动。最后使用Sim mechanics建模分析,验证主被动减振参数设置的有效性。

摘要：针对传统PID控制机械臂在运动中存在跟踪精度低、响应速度慢、动态性能差等问题,提出采用自适应模糊PID控制。通过用Sim mechanics搭建二自由度机械臂模型,分别运用传统的PID控制和自适应模糊PID控制方案进行仿真并比较上述两种方案控制效果。仿真结果表明,所设计的自适应模糊PID控制器相比传统的PID控制器对控制机械臂运动有更好的控制效果。

摘要：目的:自2007年起我科行脊柱肿瘤椎体切除稳定性重建23例,其中我科自行研究设计的脊柱肿瘤椎体切除骨水泥浇铸重建技术在临床应用共计18例,我们通过生物力学实验将该技术与钛网、人工椎体的脊柱稳定重建进行对比研究。结果:(1)骨水泥浇铸在椎体稳定重建稳定性与钛网、人工椎体在统计学上无显著差异。(2)人工椎体也是椎体重建的良好方法,但此种方法价格昂贵。(3)钛网嵌入上下椎体内,椎体高度减低,稳定性欠佳。结论:骨水泥浇铸技术是椎体稳定性重建的可行性方法。价格低廉,操作简便,是值得推广的脊柱肿瘤椎体稳定性重建方法。