高精度空调自控与节能

高精度空调系统主要靠冷热抵消方式实现精度指标,是空气调节系统中能耗最高的系统。在保证控制精度的同时,如何尽可能减少冷热抵消量,是高精度空调系统自动控制的关键。从铂电阻传感器和热敏电阻传感器的阻值/温度变化率大小、三位电动调节阀和模拟量电动调节阀运行时的增量和减量幅度、控制软件PID调节和自适应调节等技术方面进行分析。针对高精度空调系统控制精度的影响,阐述控制系统的硬件组成和软件控制方式在高精度空调系统中的选择方式,以及减少能耗抵消的途径,从而达到节能的目的。     

Selective laser melting of high aspect ratio 3D nickel–titanium structures two way trained for MEMS applications

Selective laser melting has been used to build high aspect ratio, three-dimensional NiTi micro-electro-mechanical components. Cantilever beams manufactured in this way have been two-way trained and actuated by ohmic heating demonstrating the suitability of the process for applications in micro-electromechanical technologies. The influence of laser dwell time and raster pitch on the density of NiTi shape memory alloy parts and the resolvable feature sizes achievable are discussed. The shape memory effect properties of solid parts produced by selective laser melting are also reported in contrast to those properties exhibited by NiTi alloys resulting from other processes.     

Gait fitting for snake robots with binary actuators

Thanks to the special physical architectures and various locomotion gaits,snake robots may offer significant benefits over traditional legged or wheeled locomotion designs in vast types of scenarios.This paper proposes an innovative snake robot with digitally-actuated Stewart platforms as its modules and mainly focuses on the simulations of various snake gaits.Three categories of fitting algorithms are elaborated in simulations of lateral undulation and Configuration-Fitting Algorithm of Four Modules is demonstrated as a universal gait fitting algorithm for all kinds of snake robots with binary actuators.Several typical snake gaits are simulated and the results demonstrate the excellent mobility of the snake robot.     

基于模糊控制的作动器设计研究

研究了一种新型的作动器,其特点是激振频率及振幅可在线跟踪调节,控制系统可自动识别相角差及振动幅值并自动进行调节.模糊控制器可显著地减小船舶的振动,作动器与激振器相角差控制方面首次提出了优化模糊控制算法,与传统模糊控制算法比较,模糊控制规则可根据实际测试结果进行确定,然后由程序进行分段线性优化,提高了相位角差调整的精度,理论分析和仿真结果表明,当系统模型参数发生变化时,该作动器具有良好的特性,对于抵消来自振源的振动具有很好的效果.     

具有饱和因子的时滞广义系统的鲁棒H∞控制

研究了一类带有饱和因子的时滞广义系统的鲁棒H∞控制问题．通过构造广义Lyapunov函数和线性矩阵不等式（LMI）方法,给出了系统具有H∞范数约束γ的一个充分条件,进而给出了一种H∞控制器的设计方法．     

仿生扑翼飞行机理的分析研究与技术发展

通过对鸟类和昆虫拍翅产生高升力机制的阐述,解释了仿生扑翼的飞行机理,同时概括了国内外在仿生扑翼飞行机理研究领域的发展状况及继续发展所面临的问题.在此基础上,讨论了将如何运用扑翼飞行机理,去实现仿生扑翼飞行器设计中非定常空气动力学、仿生扑翼模型、扑翼驱动机构、控制系统等研究关键技术的攻关,并且提出了下一步的研究工作——高效扑翼驱动机构研制.     

智能桁架作动器数目与位置的多目标优化

通过对含有作动器的杆件进行轴力分析,推导出智能桁架节点位移函数,运用随机权重的方法将多目标优化问题转化为单目标优化问题;在轮盘选择的基础上对遗传算法的选择算子进行改进,利用改进后的遗传算法进行求解。以12杆平面桁架为例,对作动器的数目与位置布置进行优化,结果表明只需在杆件1处布置作动器,便可以很好的控制桁架的节点位移。因此,将随机权重方法和改进遗传算法运用于智能桁架作动器数目与位置的优化中,能够取得好的优化效果和较快的收敛速度,与固定权重的方法相比,避免了人为主观性的影响。     

Development of Tri‐Stable Rotary Solenoid Actuator

We have designed and developed a tri‐stable rotary solenoid actuator, which has a simple structure and simple operation. The plunger has two stabilities at the extreme positions along an angular stroke and the third stability at the center of it. The third has been successively achieved by using the electromagnetic restoring torque, which is designed to be larger than the inertia torque. The dynamic characteristics were determined by utilizing an optimal design program that is specially constructed based on the response surface method in order to design the coil winding and the power supply for the coil excitation. A prototype solenoid was constructed and used to verify the tri‐stable motions and accuracy of the previously constructed design program.     

Profibus-DP总线在智能型电动执行机构中的应用

Profibus现场总线以其卓越的技术性能,在全世界范围内得到广泛的应用。在电动执行机构行业内也需要开发带有Profibus现场总线接口的产品。着重介绍了带有Profibus现场总线接口的智能型电动执行机构的开发、试验和应用,实践证明,使用效果较好,对其推广具有重要意义。     

Poly(methyl vinyl ether‐alt‐maleic anhydride) functionalized with 3‐aminophenylboronic acid: A new boronic acid polymer for sensing diols in neutral water

Amidation of poly(methyl vinyl ether‐alt‐maleic anhydride) with 3‐aminophenylboronic acid was used to prepare a new boronic acid polymer. The binding of catechol dye, Alizarin Red S to the polymer obtained resulted in getting a stable, colored sensor which was used to establish association constants with different diols in competitive assay. The binding of different diols was readily detected by color change and absorbance values measured at 450 nm were used to calculate the association constants. The polymer obtained formed high‐affinity complexes with ribonucleosides, particularly cytidine and uridine. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40778.