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Tuning of Mixing Zone Parameters in a Dynamic Mixer and Performance Comparison with Screw-based Mixers 动态混合器混合区参数的调整及与螺旋混合器的性能比较
IF 0.7 4区 工程技术 Q4 Physics and Astronomy Pub Date : 2023-08-09 DOI: 10.5755/j02.mech.33213
Jiagang Sun, Jiankang Wang, Yiwen Zheng, Zhijun Li
A new dynamic mixer has been designed for the mixing of two incompatible polymer melts. Three main design parameters (number of circles of holes (N), number of holes (M) per circle, and diameter of the holes (d3)) for the mixing zone of the dynamic mixer were selected to study their influences on the pressure drop (Δp) and the segregation scale (S) using Orthogonal tests. The influences of flow rate and rotational speed were also investigated. In addition, the mixing effect was compared with that of screw and slotted-screw mixers. The results showed that the most significant factor influencing S and S∙Δp is N. Both Δp and S increased with increasing flow rate, and decreased with increasing rotational speed. Compared to the screw and slotted-screw mixers, the dynamic mixer had a better mixing effect and shorter length.
设计了一种新的动态混合器,用于混合两种不相容的聚合物熔体。采用正交试验法,选择了动态混合器混合区的三个主要设计参数(孔圈数(N)、每圈孔数(M)和孔直径(d3)),研究了它们对压降(Δp)和偏析尺度(S)的影响。还研究了流量和转速的影响。此外,还将混合效果与螺杆和开槽螺杆混合机进行了比较。结果表明,影响S和S∙Δp的最显著因素是N。Δp和S均随流量的增加而增加,随转速的增加而减少。与螺杆和开槽螺杆混合机相比,动态混合机具有更好的混合效果和更短的长度。
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引用次数: 0
Position Decoupling Control of Rigid Rotor of Active Magnetic Bearing 主动磁轴承刚性转子位置解耦控制
IF 0.7 4区 工程技术 Q4 Physics and Astronomy Pub Date : 2023-08-09 DOI: 10.5755/j02.mech.31642
Binglin Li, L. Zeng
The magnetic bearing rotor system has the problem of positional coupling in the direction of the radial degrees of freedom. This paper proposes a linear output feedback method which decouples the multi-variable coupling system into four single-degree-of-freedom second-order integral subsystems. Firstly, a five-degree-of-freedom(5-DOF) mathematical model of active magnetic bearing rotor is derived. Then, a sliding mode variable structure controller is designed for the decoupled subsystems and the stability of system is guaranteed by the Lyapunov stability theory. The results of computer simulation show that the design controller of sliding mode variable structure controller can more effectively enhance the magnetic bearing rotor performance stability compared with the conventional PD controller, fuzzy PD controller, no matter in the position respond control and anti-disturbance control. Moreover, the sliding mode variable structure controller make the system have better tracking performance.
磁轴承转子系统在径向自由度方向上存在位置耦合问题。提出了一种线性输出反馈方法,将多变量耦合系统解耦为4个单自由度二阶积分子系统。首先,建立了主动磁轴承转子的五自由度数学模型;然后,对解耦子系统设计滑模变结构控制器,利用Lyapunov稳定性理论保证系统的稳定性。计算机仿真结果表明,与传统PD控制器、模糊PD控制器相比,所设计的滑模变结构控制器无论在位置响应控制还是抗干扰控制方面都能更有效地提高磁轴承转子的性能稳定性。此外,滑模变结构控制器使系统具有更好的跟踪性能。
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引用次数: 0
Kinematics & Compliance Validation of a Vehicle Suspension and Steering Kinematics Optimization Using Neural Networks 基于神经网络的车辆悬架运动学与顺应性验证及转向运动学优化
IF 0.7 4区 工程技术 Q4 Physics and Astronomy Pub Date : 2023-06-17 DOI: 10.5755/j02.mech.31983
Gurur Ağaki̇şi̇, F. Öztürk
Physical and virtual K&C analyses are performed to achieve the vehicle dynamics targets by finding the optimum variables such as the position of hardpoints or stiffnesses of bushings. However, finding appropriate design variables that meet all the aims is challenging. This paper evaluates a hardpoint optimization approach to attain suspension K&C characteristic objectives with the design of experiments, neural networks, and genetic algorithm, based on a reference compact-sized prototype vehicle. The MBD model correlation is provided to optimize the hardpoints to improve the vehicle's steering kinematics concerning Ackerman error and camber angle variation that are out of target in baseline suspension. The results showed that NN based optimization strategy to define the hardpoints has significantly improved targeted characteristics compared to conventional response surface methods in the limited design space.
通过寻找最佳变量,如硬点位置或衬套刚度,进行物理和虚拟K&C分析,以实现车辆动力学目标。然而,找到满足所有目标的适当设计变量是一项挑战。本文基于一辆参考紧凑型原型车,通过实验、神经网络和遗传算法的设计,评估了一种实现悬架K&C特性目标的硬点优化方法。提供MBD模型相关性来优化难点,以改善车辆在基线悬架中超出目标的Ackerman误差和外倾角变化的转向运动学。结果表明,在有限的设计空间内,与传统的响应面方法相比,基于神经网络的硬点定义优化策略显著改善了目标特性。
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引用次数: 0
Logistics Pure Electric Vehicle Routing Based on GA-PSO Algorithm 基于GA-PSO算法的物流纯电动汽车路径选择
IF 0.7 4区 工程技术 Q4 Physics and Astronomy Pub Date : 2023-06-17 DOI: 10.5755/j02.mech.31954
M. Wang, Qiyue Xie
 Abstract:Based on current energy storage technologies such as batteries and fuel cells, the inherent battery capacity of electric vehicles puts constraints on their driving range and requires charging in the process of completing driving tasks. In this paper, with the current practical application in logistics industry as the background, from electric vehicle charging scheduling and path planning, a hybrid algorithm combining genetic-particle swarm algorithm is proposed to plan the best driving route for a group of electric logistics vehicles with vehicle load, vehicle battery life, charging facility location and customer time window as constraints and the total cost as the objective function. Based on the single distribution center, a more complex multi-distribution center electric vehicle path planning problem is considered. In this paper, multiple sets of Solomon VRPTW data sets are selected to test the prepared algorithm, and the results show that the algorithm can effectively plan the best distribution scheme.
摘要:基于当前电池和燃料电池等储能技术,电动汽车固有的电池容量限制了其续航里程,并需要在完成驾驶任务的过程中充电。本文以当前物流行业的实际应用为背景,从电动汽车充电调度和路径规划两个方面,提出了一种结合遗传粒子群算法的混合算法,以规划一组电动物流车在车辆负载、车辆电池寿命、,以充电设施位置和客户时间窗口为约束条件,以总成本为目标函数。在单个配送中心的基础上,考虑了一个更复杂的多配送中心电动汽车路径规划问题。本文选取了多组Solomon VRPTW数据集对所编制的算法进行了测试,结果表明该算法能够有效地规划最佳分配方案。
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引用次数: 0
Influence of Geometrical Shape on the Lubrication Performance of Partially Micro-Grooved Gas-Lubricated Parallel Slider Bearings 几何形状对部分微槽气体润滑平行滑块轴承润滑性能的影响
IF 0.7 4区 工程技术 Q4 Physics and Astronomy Pub Date : 2023-06-17 DOI: 10.5755/j02.mech.32384
Fuxi Liu, Chunjie Yang, Shanwu Xu, Kang Xie, Dunzhao Xie, Binhui Han, Zhanlong Li
The influence of grooving parameters and micro-groove cross-section shape on the lubrication performance of partially micro-grooved gas-lubricated parallel slider bearings is investigated in the present study. The solution procedure for the multi-grid finite element method is that the algebraic equations formed by the finite element method are in turn smoothed by the interpolation from the coarse grid to the fine grid and the restriction from the fine grid to the coarse grid. By adopting the multi-grid finite element method, the pressure distribution of partially micro-grooved gas-lubricated parallel slider bearings is obtained. The grooving parameters are optimized to obtain the maximum average pressure for different micro-groove cross-section shapes. The results show that the orientation angle of the micro-grooves, depth of the micro-grooves, width of the micro-grooves, area density of the micro-grooves, micro-grooved fraction, and cross-section shape of the micro-grooves have an important influence on the hydrodynamic pressure of partially micro-grooved gas-lubricated parallel slider bearings. The results of this study demonstrate that the lubrication performance of partially micro-grooved gas-lubricated parallel slider bearings can be obviously enhanced by adopting the appropriate grooving parameters and micro-groove cross-shape. The results of this study is beneficial for the design of partially micro-grooved gas-lubricated parallel slider bearings.
研究了微沟槽参数和微沟槽截面形状对部分微沟槽气体润滑平行滑块轴承润滑性能的影响。多网格有限元法的求解过程是将有限元法所形成的代数方程依次通过由粗网格向细网格的插值和由细网格向粗网格的约束进行平滑处理。采用多网格有限元法,得到了部分微槽气体润滑平行滑块轴承的压力分布。优化开槽参数,得到不同微槽截面形状下的最大平均压力。结果表明:微沟槽的取向角、微沟槽深度、微沟槽宽度、微沟槽面积密度、微沟槽比例和微沟槽截面形状对部分微沟槽气体润滑平行滑块轴承的动水压力有重要影响。研究结果表明,采用适当的微沟槽参数和微沟槽交叉形状可以明显提高部分微沟槽气体润滑平行滑块轴承的润滑性能。研究结果对部分微槽气体润滑平行滑块轴承的设计具有一定的指导意义。
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引用次数: 0
Research on Pump Speed Control System Based on Fuzzy PID 基于模糊PID的水泵调速系统研究
IF 0.7 4区 工程技术 Q4 Physics and Astronomy Pub Date : 2023-06-17 DOI: 10.5755/j02.mech.32721
Yin Luo, Tao Jin, Xiao Li, Xuechong Qin, Yuejiang Han
In this paper, based on MATLAB/simulink, the PID vector frequency conversion control of permanent magnet synchronous motor has better drive control performance in the multi-stage centrifugal pump speed control system. The electric-hydraulic coupling system of centrifugal pump has a good evaluation and research function. In view of the low efficiency of the traditional PID control method and the poor adaptability to the change of working environment, a vector control method of permanent magnet synchronous motor based on adaptive and self-adjusting fuzzy control principle is proposed for the speed regulation system of water pump. The simulation results show that the PMSM system controlled by the fuzzy PID controller is superior to the traditional PID control, and has better disturbance resistance, dynamic and steady performance.
本文基于MATLAB/simulink的永磁同步电机PID矢量变频控制在多级离心泵调速系统中具有较好的驱动控制性能。离心泵电液耦合系统具有良好的评价和研究功能。针对传统PID控制方法效率低、对工作环境变化适应性差的问题,针对水泵调速系统,提出了一种基于自适应自调整模糊控制原理的永磁同步电机矢量控制方法。仿真结果表明,采用模糊PID控制器控制的永磁同步电机系统优于传统的PID控制,具有较好的抗干扰性、动态稳定性能。
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引用次数: 0
Dynamic Research on Low-frequency Vibration Isolation Tables 低频隔振台的动力学研究
4区 工程技术 Q4 Physics and Astronomy Pub Date : 2023-06-17 DOI: 10.5755/j02.mech.32385
Gintas VISELGA, Vytautas TURLA, Ina TETSMAN, Jan Radek KAMINSKI
In the paper, an establishment of dynamic characteristics of tabletops of the newly-developed optical tables is being discussed upon. Low-frequency vibration isolation systems are reviewed. Theoretical and experimental tests have been performed. Dynamic models of an optical table on a vibrating platform at different excitations have been developed, the dynamic displacement and the resonance frequencies of the system have been established and vibration transmissibility curves have been presented. The obtained dynamic characteristics of the mechanical passive low-frequency vibration isolation system show that such a system is able to isolate the vibrations effectively. The results of the performed experimental tests confirm the data of the theoretical research.
本文讨论了新研制的光学台面动态特性的建立问题。对低频隔振系统进行了综述。进行了理论和实验测试。建立了振动平台上光学工作台在不同激励下的动力学模型,建立了系统的动态位移和共振频率,给出了系统的振动传递率曲线。得到的机械被动低频隔振系统的动态特性表明,该系统能够有效地隔振。实验结果证实了理论研究的结论。
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引用次数: 0
Accessibility and Trajectory Planning of Cutter Changing Robot Arm for Large-Diameter Slurry Shield 大直径泥水盾构换刀机械臂的可达性及轨迹规划
IF 0.7 4区 工程技术 Q4 Physics and Astronomy Pub Date : 2023-06-17 DOI: 10.5755/j02.mech.30386
Mei Yang, G. Zeng, Yong Ren, Lai-kuang Lin, Wei Ke, Yifan Liu
Aiming at solving the problems of huge cost, long cycle and high risky during manual cutter changing process for shield machine, a cutter changing robot was designed to adapt to its narrow and complex space, the workspace and motion path of cutter changing robot arm were studied. Firstly, by analyzing the internal space and cutter layout characteristic, the configuration of the robot arm was proposed, and the dimension of each rod was designed using multi-objective optimization method. The kinematic model of the robot arm was established by using the D-H model method to analyze its reachable working space. While the inverse kinematic model of the robot arm was solved by the Newton-Raphson iterative method to complete the trajectory planning of the arm for all cutter locations, where the relationship between the target position and the joint variables was established. The motion stability of the robot was verified by virtual simulation and test. The results show that the working space of the designed robot arm meets the cutter changing requirements that all the cutter position can be reached. Moreover, the power output of the drive is smooth, which can transport the cutter weighing up to 250kg.
针对盾构机手动换刀过程中成本高、周期长、风险大的问题,设计了一种适应其狭小复杂空间的换刀机器人,研究了换刀机器人手臂的工作空间和运动路径。首先,通过分析机器人内部空间和刀具布局特点,提出了机器人手臂的结构,并采用多目标优化方法设计了每个连杆的尺寸。利用D-H模型方法建立了机器人手臂的运动学模型,分析了其可达工作空间。而机械臂的逆运动学模型则通过Newton-Raphson迭代方法求解,以完成机械臂在所有刀具位置的轨迹规划,其中建立了目标位置与关节变量之间的关系。通过虚拟仿真和试验验证了机器人的运动稳定性。结果表明,所设计的机器人手臂的工作空间满足了换刀要求,即可以达到所有刀具位置。此外,驱动装置的动力输出平稳,可输送重达250公斤的刀具。
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引用次数: 0
Parametric study on the exergy analysis of a dual evaporator cooling cy-cle powered by the organic Rankine cycle 有机朗肯循环双蒸发器冷却系统(火用)分析参数研究
IF 0.7 4区 工程技术 Q4 Physics and Astronomy Pub Date : 2023-06-17 DOI: 10.5755/j02.mech.32652
Rabah Touaibi, Hasan Köten
This study conducts a parametric study based on the energy and exergy analysis of a combined cycle composed of an organic Rankine and dual evaporator cooling cycles. The mechanical power supplied provides the mechanical compression refrigeration cycle with two evaporators. The influence of operating temperature, including the impact of the evaporator temperature of the organic Rankine cycle and the effect of dual evaporator cooling cycle evaporator temperature, were investigated; in this case, three organic fluids were employed such as R134a, R290, and R600. The results indicate that using R600 as the working fluid for both cycles enhance the system performance, and the energy efficiency of the combined system grows from 27.10 % to 40.22 %.The performance factor of the dual evaporator cooling cycle increases from 3.25 to 3.29 for the evaporating temperature of the first evaporator and from 2.07 to 4.28 for the second evaporator. Moreover, it is also noted that the exergy efficiency of the dual evaporator cooling cycle decreased from 40.03 % to 30.18 % for the first evaporator and increased by 32.47 % to 38.82 % for the second evaporator.
本研究基于由有机朗肯和双蒸发器冷却循环组成的联合循环的能量和火用分析进行了参数研究。所提供的机械动力为具有两个蒸发器的机械压缩制冷循环提供动力。研究了运行温度的影响,包括有机朗肯循环蒸发器温度的影响和双蒸发器冷却循环蒸发器温度对蒸发器温度的作用;在这种情况下,使用三种有机流体,例如R134a、R290和R600。结果表明,使用R600作为两种循环的工作流体,可以提高系统的性能,组合系统的能效从27.10%提高到40.22%。双蒸发器冷却循环的性能因子从第一蒸发器的3.25提高到3.29,从第二蒸发器的2.07提高到4.28。此外,还注意到,双蒸发器冷却循环的火用效率从第一个蒸发器的40.03%下降到30.18%,第二个蒸发器的32.47%上升到38.82%。
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引用次数: 0
Influence of Temperature Variance on the Mechanical Properties of a Welded Bearing Support Flange Under Transient Conditions Using Finite Element Approach 温度变化对瞬态条件下焊接轴承支承法兰力学性能的影响
IF 0.7 4区 工程技术 Q4 Physics and Astronomy Pub Date : 2023-06-17 DOI: 10.5755/j02.mech.31209
Kishorekanna Gunasekaran, Isaac Solomon, R. Skvireckas, G. Dundulis
During a welding process, the influence of temperature distribution plays an important role affecting the vulnerable regions of the welded component. This research aims at presenting data on similar cases where a detailed comparative evaluation provides necessary data for designing a component based on its structural behaviour due to induced temperature variance during the groove welding process using finite element approach. The finite element simulations render a real-world scenario of the groove welding process by integrating the concept of ‘Moving heat source’ under transient conditions in ANSYS. The numerical comparative study is achieved by simulating a thermal study of the welded components of different bearing support flange plate thickness and evaluating its structural behaviour under induced thermal loads. The numerical solutions obtained from these simulations provide necessary data which helps in identifying the feasible design approach to increase the life of a welded component under such temperature-dependent conditions.
在焊接过程中,温度分布的影响对焊接构件的脆弱区域起着重要的作用。本研究旨在提供类似案例的数据,其中详细的比较评估为使用有限元方法设计基于坡口焊接过程中诱导温度变化的结构行为的组件提供必要的数据。有限元模拟通过整合ANSYS中瞬态条件下“移动热源”的概念,呈现了坡口焊接过程的真实场景。通过对不同支承法兰板厚度的焊接构件进行热模拟研究,评估其在诱导热载荷作用下的结构性能,实现了数值对比研究。从这些模拟中获得的数值解提供了必要的数据,有助于确定可行的设计方法,以增加在这种温度相关条件下焊接部件的寿命。
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引用次数: 0
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Mechanika
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