摘要：以棉籽粕、面粉为原料进行挤压膨化,将蛋白消化率作为考察指标,在挤压温度、螺杆转速、水分含量、面粉含量单因素试验结果的基础上,运用中心组合设计(central composite design,CCD)对挤压参数进行优化,确定最佳挤压条件。结果表明,最佳挤压参数为挤压温度106℃、螺杆转速207 r/min、水分含量23.50%、面粉含量18.50%。在此条件下,蛋白消化率达84.40%。与未挤压原料相比,蛋白消化率提高了47.94%。

摘要：Traditional coupled multi-disciplinary design optimization based on computational fluid dynamics/computational structure dynamics(CFD/CSD)aims to optimize the jig shape of aircraft,and general multi-disciplinary design optimization methodology is *** special consideration is given to the aircraft itself during the *** main drawback of these methodologies is the huge expanse and the low *** solve this problem,we put forward to optimize the cruise shape directly based on the fact that the cruise shape can be transformed into jig shape,and a methodology named reverse iteration of structural model(RISM)is proposed to get the aero-structural performance of cruise *** main advantage of RISM is that the efficiency can be improved by at least four times compared with loosely-coupled aeroelastic analysis and it maintains almost the same fidelity of loosely-coupled aeroelastic *** optimization framework based on RISM is *** aerodynamic and structural performances can be optimized simultaneously in this framework,so it may lead to the true optimal *** aerodynamic performance was predicted by N-S solver in this *** shows that RISM predicts the aerodynamic and structural performances very well.A wing-body configuration was optimized by the proposed optimization *** drag and weight of the aircraft are decreased after optimization,which shows the effectiveness of the proposed framework.

摘要：This work focuses on motion control of high-velocity autonomous underwater vehicle(AUV).Conventional methods are effective solutions to motion control of low-and-medium-velocity *** not taken into consideration in the control model,the residual dead load and damping force which vary with the AUV’s velocity tend to result in difficulties in motion control or even failure in convergence in the case of high-velocity *** full consideration given to the influence of residual dead load and changing damping force upon AUV motion control,a novel sliding-mode controller(SMC)is proposed in this *** stability analysis of the proposed controller is carried out on the basis of Lyapunov *** sea trials results proved the superiority of the sliding-mode controller over sigmoid-function-based controller(SFC).The novel controller demonstrated its effectiveness by achieving admirable control results in the case of high-velocity movement.

摘要：为提高注塑模随形冷却水道的冷却效率和模温均匀性,提出了一套随形冷却水道多目标优化设计的方法。该方法通过正交法和三维响应面法对影响模具温度变化的因素进行分析。利用响应面法构建随形冷却水道的设计变量与冷却效率和模具型腔表面温度分布均匀性的函数关系,求解出最佳的设计参数。

摘要：以汽车长条注塑件为例,对其翘曲变形问题进行了研究。首先从流道平衡性方面比较了两种浇注系统对于翘曲变形的影响,选择较优的浇注系统进行工艺参数优化设计。以长条件的成型工艺参数:熔体温度、注塑时间和填充压力为实验因子,翘曲变形量为实验目标进行两次Taguchi实验设计。两次实验设计的目的是逐步缩小工艺参数的范围,从而在短时间内确定一个可靠的优化方案。为长条注塑件翘曲问题的改进及其工艺参数的优化提供一个参考案例。

摘要：室内空间设计即以家具、陶瓷、艺术品等陈设实现装饰设计,而陶瓷陈设具备独特审美价值与应用价值,与室内空间设计需求高度契合,且可有机结合风格迥异的空间形式,以不同形式陶瓷陈设,充分发挥室内空间优势。本文主要对基于陶瓷陈设的室内空间设计进行了详细分析。

摘要：为保证自主水下航行器在进行地形跟踪任务时,可以更好地抵抗外界环境及自身信号传输的干扰作用,提出一种基于自抗扰控制技术的地形跟踪控制方法,可以将地形跟踪转化为水下机器人的纵倾控制,并设计有运动保护机制。在仿真实验中,利用所设计方法,进行了三维运动仿真,模拟了机器人从水面到水下完成地形跟踪任务的全过程,并与基于PID控制方法的控制器进行比较。结果表明,基于自抗扰控制技术的地形跟踪控制方法能够准确完成预定任务,同时,相比于基于PID的跟踪方法,能够更有效地抑制干扰所造成的超调和震颤等现象,具有更优的控制效果。

摘要：研究了配置高度计和多普勒速度计(DVL)的欠驱动水下机器人地形跟踪控制问题.采用Takagi-Sugeno推理方法对高度计和DVL两种传感器的高度信息进行融合,提高了高度信息感知能力.将地形跟踪分为速度控制和深度控制问题,分别使用S面控制方法设计速度控制器和反步法设计欠驱动深度控制器.最后,通过实际海洋实验对研究的方法进行了验证,实验结果表明该文提出的方法是有效的.

摘要：研究一类非完全对称欠驱动无人艇的轨迹跟踪控制问题,考虑系统阻尼系数矩阵和惯性系数矩阵非对角线元素存在非零项,且阻尼系数随着航速变化的情况,首先通过两次全局微分同胚变换将系统矩阵变换为级联系统的形式,使控制模型得以简化;然后基于简化后的模型构建轨迹跟踪误差模型,将轨迹跟踪问题转化为误差的镇定问题,同时基于级联系统理论和Lyapunov直接法设计了误差镇定控制器,该控制器能够实现非完全对称欠驱动高速无人艇的任意参考轨迹的跟踪控制,包括原点的镇定控制。最后通过仿真实验验证了所设计控制器的有效性。

摘要：弹性超材料可以实现减振降噪、波导、隐身等弹性波操控功能,具有广阔的工程应用前景。本文引入固液相变材料作为散射体对比研究了散射体固液两种形态下的带隙特性和隔振性能,利用数值方法计算单胞的能带结构和动态有效质量,研究了影响超材料带隙特性的因素,并通过试验验证了两种形态超材料的隔振性能。结果表明:液态散射体超材料可产生局域共振带隙实现低频段隔振,固态散射体超材料可产生Bragg带隙实现宽频段隔振;同时,改变外界条件对两种设计形态的带隙均起到很好的调控作用。由此,超材料散射体两种设计状态的转变实现了带隙类型的转变和隔振频段的调节,可为适应热环境下的相变散射体超材料构型设计和隔振特性调控提供参考依据。