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针对耗能机电产品性能匹配问题,提出基于因果模型的性能匹配方法。能量是机电产品性能实现的关键因素,通过构建设计变量、能量和性能之间的三层因果模型,计算设计变量对性能的影响程度,通过对影响程度性能高的设计变量匹配优化实现产品性能优化。最后采用家用电冰箱性能匹配设计的案例论证了基于因果模型的耗能产品性能设计方法的有效性。 相似文献
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针对目前岸边集装箱起重机工作状态防风研究重视制动性能而忽视驱动性能的现状,提出了制动性能与驱动性能联合考虑的观点,并基于整数规划方法研究了在一定预算条件下制动性能与驱动性能的组合最优问题,发现驱动性能随主动轮数量变化显著,制动性能随从动轮数量变化平缓;大车总车轮数的增加对组合防风制动和驱动性能的提升作用甚微;轮压分配对岸桥的组合防风性能有一定影响。 相似文献
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针对工业机器人的加工效果具有位姿依赖性这一特点,基于机器人性能评价指标和遗传算法提出一种优化机器人加工位姿的方法.建立机器人正运动学模型和静刚度模型并选取机器人运动性能评价指标和刚度性能评价指标;通过蒙特卡罗法得到机器人运动性能、刚度性能在关节空间和笛卡儿空间的分布图,通过分布图研究机器人各关节对机器人运动性能、刚度性能的影响;基于机器人运动性能评价指标和刚度性能评价指标设计适应度函数,使用遗传算法对机器人加工位姿进行优化,优化后机器人性能得到了提升. 相似文献
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根据产品设计的性能要求,利用图的分析方法,生成产品的性能连接图,通过性能连接图产生性能分析矩阵,由性能分析矩阵得到产品方案设计的综合性能评价指标,来进行产品多方案决策;然后,通过该方法在重型越野车驱动桥设计多方案决策中的运用,说明它具有简单、实用和有效等优点。 相似文献
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为了满足客户对夹持机构性能的不同需求,并使系统能够对不同构型的夹钳性能做出评判与决策,以模糊层次分析法为基础,建立夹钳机构综合性能评价指标体系,构造了夹钳不同性能取向矩阵,并引入产品性能综合性能指数,提出了在用户性能要求已知的情况下模型优选的新方法.以现有的4种夹钳结构为例, 针对不同客户的性能需求,通过综合性能指数计算验证了此方法的可行性. 相似文献
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《Measurement》2016
In this paper, an adaptive fuzzy control (AFC) system is proposed to realize level position control of two coupled water tanks, often encountered in practical process control. The fuzzy control system includes an adaptive model identifier and controller. The gains of AFC are obtained by using the fuzzy identifier model which is defined by real system outputs and control inputs. The parameters of fuzzy identifier model are adjusted online by using recursive least square algorithm. Because the controller has a recursive form it treats model uncertainties and external disturbances in an implicit way. Thus there is no need to specify uncertainty and disturbances for this controller design in advance. A well-tuned conventional proportional integral (PI) controller is also applied to the two coupled tank system for comparison with the AFC system. Experimentation of the coupled tank system is realized in two different configurations, namely configuration #1 and configuration #2 respectively. In configuration #1, the water level in the top tank is controlled by a pump. In configuration #2, the water level in the bottom tank is controlled by the water flow coming out of the top tank. Experimental results prove that the AFC shows better trajectory tracking performance than PI controller in that the plant transient responses to the desired output changes have shorter settling time and smaller magnitude overshot/undershoot. Robustness of the AFC with respect to water level variation and capability to eliminate external disturbances are also achieved. Experimental results show that AFC is a strong and a practical choice for liquid level control. 相似文献
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An adaptive saturated fault-tolerant controller is proposed for a spacecraft rendezvous maneuver with a cooperative target spacecraft. The six-degree-of-freedom (6-DOF) relative dynamics subject to unknown inertial parameters, external disturbances, actuator faults and saturations are formulated in the pursuer's body-fixed frame. To design controller satisfying asymmetric magnitude constraints, a modified smooth hyperbolic tangent function is applied to approximate the non-differentiable saturation function. Based on the augmented system technique, an adaptive fault-tolerant saturated controller is designed for the pursuer by using a Nussbaum function matrix compensating for the nonlinear term arising from the input saturations. In addition, a Levant differentiator is introduced to obtain the derivative of the virtual control in finite time that avoids the complicated calculation. It is proved via Lyapunov stability theory that all the signals in the closed-loop augmented system are bounded and the relative errors asymptotically converge to zero. Numerical simulations are performed to illustrate effectiveness of the proposed controller. 相似文献
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简单介绍了控制理论的形成和发展、电液控制系统的组成,详细地阐述了电液控制系统的控制方法,控制理论广泛应用于电液控制系统中,是自动化技术发展水平的重要标志,它对电液控制系统性能的改善起着举足轻重的作用。 相似文献
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A new robust three-dimensional integrated guidance and control (3D-IGC) approach is investigated for sliding-to-turn (STT) hypersonic missile, which encounters high uncertainties and strict impact angle constraints. First, a nonlinear state-space model with more generality is established facing to the design of 3D-IGC law. With regard to the as-built nonlinear system, a robust dynamic inversion control (RDIC) approach is proposed to overcome the robustness deficiency of traditional DIC, and then it is applied to construct the basic 3D-IGC law combining with backstepping method. In order to avoid the problems of “explosion of terms” and high-frequency chattering, an improved 3D-IGC law is further proposed by introducing dynamic surface control and continuous approximation approaches. From the computer simulation on a hypersonic missile, the proposed 3D-IGC law not only guarantees the stable flight, but also presents the precise control on terminal locations and impact angles. Moreover, it possesses smooth control output and strong robustness. 相似文献