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基于输出反馈的一类Holder连续非线性系统的全局实际镇定傅勤,吴健荣苏州科技学院数理学院摘 要:借助非线性系统实际观测器的概念,对一类Holder连续非线性系统进行了输出反馈控制器设计.通过对系统状态作线性变换,得到输出反馈控制器,当输出反馈控制律作用于该系统时,闭环系统是全局实际稳定的.仿真算例说明了所得结论的可行性和有效性.关键词:Holder连续非线性系统;输出反馈;全局实际镇定;......
热连轧自适应穿带模型的研究及应用胡松涛1(1.四川省攀枝花市攀枝花钢铁(集团)公司热轧板厂)摘 要:攀枝花钢铁(集团)公司热轧板厂三期技术改造后,精轧设定模型精度受粗轧中间坯厚度,宽度和温度等参数影响较大,造成轧制参数预报精度下降,为此,于2007年采用精轧自适应穿带模型对轧制力,辊缝,轧制速度进行补偿,提高精轧设定模型对轧制力,出口厚度等轧制参数的预报精度.关键词:热连轧机; 自适应; 中间坯厚度; 轧制力; 辊缝......
is to develop the thermal deep drawing system with vacuum environment and variable blank holder force for investigating the high-temperature forming behavior of difficult-to-deformation materials... to be oxidized at high temperatures. The vacuum hot drawing system was discussed and developed based on the integration of vacuum heating technology and variable blank holding force (BHF) system, which......
Article ID: 1003-6326(2005)02-0211-06 Effect of external shearing force on exfoliation structure and properties of high-performance epoxy/clay nanocomposites LU Hai-jun(鹿海军)1, 2, ZHANG Bao... and homogeneous mixing(HEHM) and ball milling were used to exert external shearing force on two organic clay tactoids (termed as MMTDDA and MMTDBDA, respectively), which were organically modified......
, such as die radius, blank holder force, and friction coefficient, on the forming process. The distributions of thickness and equivalent plastic strain of the drawn part were evaluated. The results show that die radius has a relative major influence on the deep drawing process, followed by friction coefficient and blank holder force.关键词:......
the effect of process parameters on formability and mechanical properties of aluminum alloy 7075 in hot stamping process.Process parameters, including blank temperature, stamping speed, blank holder force and friction coefficient, were studied. Stamping tests were conducted at temperatures between 350 and 500 ℃, blank holder force between 0 and 10 kN, stamping speed between 50 and 150 mm·s-1......
of factors, including material properties, sheet thickness, geometrical feature of panels and blank holding force (BHF). For the car roof, surface deflection is mainly caused by insufficient shape..., which can be eliminated by optimizing the panel shape and improving the structural stiffness. Key words: exterior panel; car roof; surface deflection; stiffness; blank holding force; residual stress 塌陷是......
of Materials Science and Engineering, Chongqing University, Chongqing 400044, China Received 27 December 2014; accepted 14 May 2015 Abstract: The porosity of titanium foams obtained from the space holder... sintering decreases based on theory and practice. Key words: porous material; titanium foam; space holder technique; sintering; volume change; porosity 1 Introduction Titanium foams are a kind......
coefficient was used in the simulations. Moreover, to prevent wrinkling in the sheet drawing process, a blank holder force during the forming process is assumed for each case, in these analyses... of coated steels[J]. Journal of Materials processing Technology, 1996, 58(2/3): 153-159. [12] LIN Zhong-qin, WANG Wu-rong, CHEN Guan-long. A new strategy to optimize variable blank holder force towards......
helical teeth shafts with round blank and concave round blank were conducted respectively in H630 cross wedge rolling mill. The results show that rolling in round blank is apt to produce workpieces with defects such as uneven height of teeth and uneven pitch, while rolling in concave round blank can solve the problem of uneven height of teeth. The empirical formula of the ideal diameter for blank......