scholarly journals Оптимизация масс-сепараторов

2021 ◽  
Vol 91 (11) ◽  
pp. 1756
Author(s):  
В.В. Лукашевич
Keyword(s):  
Phase Diagrams ◽  
Linear Approximation ◽  
Rotation Angle ◽  
Mass Separator ◽  
Beam Path ◽  
Beam Emittance ◽  
Ion Energy ◽  
Simulation Results ◽  
Liouville’S Theorem

The optimization of separator masses in this paper is based on the realization of the linearity of the system under study and the consequences of Liouville's theorem. The properties of several mass separators with an ion energy of 30 keV and a beam emittance of 4 mm*mrad are considered. Focusing is provided by an aberration-free lens and a magnetic corrector. Phase diagrams along the beam path are in the form of parallelograms, which indicates the absence of geometric aberrations. For each of the separators, the resolution calculated in the linear approximation coincides with the simulation results. It is shown that a mass separator based on a magnet with a rotation angle of 54.70 has a resolution of about 5000, and a separator based on two magnets with a rotation angle of 450 and 900, respectively, has a resolution of 14000-15000.

scholarly journals Generation of a double-crowned involute helical gear with twist-free tooth flanks by a CNC hobbing machine with three synchronous axes

2017 ◽  
Vol 39 (2) ◽  
pp. 97-108
Author(s):  
Van-The Tran
Keyword(s):  
Computer Simulation ◽  
Rotation Angle ◽  
Computer Numerical Control ◽  
Helical Gear ◽  
Numerical Control ◽  
Production Costs ◽  
Parabolic Curve ◽  
Transmission Errors ◽  
Simulation Results ◽  
Center Distance

In the conventional hobbing process, a double-crowned involute helical gear is generated by the hob cutter with parabolic-curve tooth profiles for the cross-profile crowning and varied the center distance between the hob and work gear for the longitudinal crowning. Therefore, to cut a double-crowned helical gear not only requires at least four synchronous axes and hob cutter regrinding (which increases production costs) but also induces twisted tooth flanks on the generated work gear. In this paper, I propose a hobbing method by applying a modified work gear rotation angle that enables double-crowning of involute helical gear's tooth flanks using a standard hob cutter and a computer numerical control (CNC) hobbing machine with only three synchronous axes. The proposed method has also verified by using two computer simulation examples to compare the meshing-conditions, contact ellipses, and transmission errors of the double-crowned gear pairs with that produced by applying the conventional hobbing method. Computer simulation results reveal the advantages of the proposed novel hobbing method.

Adaptive Mismatch Compensation for Rate Integrating Vibratory Gyroscopes With Improved Convergence Rate

2014 ◽  
Author(s):  
Fu Zhang ◽  
Ehsan Keikha ◽  
Behrooz Shahsavari ◽  
Roberto Horowitz
Keyword(s):  
Convergence Rate ◽  
Degrees Of Freedom ◽  
Rotation Angle ◽  
Least Square ◽  
Parameter Estimates ◽  
Unknown Parameters ◽  
Least Square Estimator ◽  
Vibratory Gyroscopes ◽  
Adaptive Compensator ◽  
Simulation Results

This paper presents an online adaptive algorithm to compensate damping and stiffness frequency mismatches in rate integrating Coriolis Vibratory Gyroscopes (CVGs). The proposed adaptive compensator consists of a least square estimator that estimates the damping and frequency mismatches, and an online compensator that corrects the mismatches. In order to improve the adaptive compensator’s convergence rate, we introduce a calibration phase where we identify relations between the unknown parameters (i.e. mismatches, rotation rate and rotation angle). Calibration results show that the unknown parameters lie on a hyperplane. When the gyro is in operation, we project parameters estimated from the least square estimator onto the hyperplane. The projection will reduce the degrees of freedom in parameter estimates, thus guaranteeing persistence of excitation and improving convergence rate. Simulation results show that utilization of the projection method will drastically improve convergence rate of the least square estimator and improve gyro performance.

A Modified Phase Correlation Method for Image Registration

2011 ◽  
Vol 48-49 ◽  
pp. 48-51
Author(s):  
Lu Jing Yang ◽  
Wei Hao ◽  
Chong Lun Li
Keyword(s):  
Image Registration ◽  
Rotation Angle ◽  
Translational Motion ◽  
Correlation Method ◽  
Phase Correlation ◽  
Flow Chart ◽  
Reference Image ◽  
Sar Image ◽  
Registration Method ◽  
Simulation Results

Image registration is a very fundamental and important part in many multi-sensor image based applications. Phase correlation-based image registration method is widely concerned for its small computation amount, strong anti-interference property. However, it can only solve the image registration problem with translational motion. Hence, we proposed a modified phase correlation registration method in the paper. We analyzed the principle of registration, gave the flow chart, and applied the method to the SAR image registration problems with scaling, rotation and translation transformation. Simulation results show that the method can accurately estimate the translation parameters, zoom scale and rotation angle of registrating image relative to the reference image.

Swirl-Based Control Method of Cell Orientation-Impact on Control Performance with Eccentricity

2014 ◽  
Vol 625 ◽  
pp. 717-721 ◽  
Author(s):  
Qin Zhang ◽  
Jian Hua Wang ◽  
Wei Jun Huang ◽  
Hisayuki Aoyama
Keyword(s):  
Numerical Simulation ◽  
Rotation Angle ◽  
Control Method ◽  
Movement Trajectory ◽  
Control Performance ◽  
Cell Orientation ◽  
Orientation Control ◽  
Cell Position ◽  
Simulation Results ◽  
Position And Orientation

The adjustment of cell position and orientation is important in cell micromanipulation of bioengineering, which directly affects the efficiency and success ratio of the micromanipulation. Cell orientation can be adjusted by swirl, which comes from a pair of parallel opposite micro-fluids from two tiny tubes, and the cell in swirl center will rotate. Quantitative control of rotation angle and velocity of the cell can be achieved by adjusting the velocity and frequency of micro-fluid. This control method of cell orientation has prospective applications for its non-contact characteristics. However, cell will not be right in the swirl center in practical operations. And if the eccentric cell can rotate steadily, swirl method will be more reliable. So numerical simulation was conducted to study the movement trajectory of cells with eccentricity, and the influences of eccentric directions and eccentric distances were discussed. The simulation results indicate the feasibility of orientation control of cells with eccentricity by swirl.

Simple RAM Control for Water Strider Robot

2018 ◽  
Vol 7 (3.7) ◽  
pp. 149
Author(s):  
Kyunghan Chun ◽  
Bonghwan Kim
Keyword(s):  
Rotation Angle ◽  
Target Point ◽  
Water Strider ◽  
Nonlinear Controllers ◽  
Simulation Results ◽  
Proportional Controller

In this paper, we propose a RAM (Rotate and Move) controller by considering the WSR (Water Strider Robot) with two wheels. The proposed controller commands to move straight after rotating to track the desired trajectory by applying the two wheel WSR characteristics. In this paper, a proportional controller is applied to make the error zero and there is a room to apply many other nonlinear controllers. For a given target point, the rotation angle is computed at first and the shorter rotating angle is chosen between CW (clockwise) and CCW (counterclockwise). After accomplishing rotation, the WSR moves straight toward the target point. The proposed controller is noble and simple and easily track the target point and the simulation results proves the good performance and this controller will be applied to the developing prototype WSR.  

A Study of Wheel Flange Partial Wear Problem of Heavy Haul Locomotive

2011 ◽  
Vol 204-210 ◽  
pp. 241-244 ◽  
Author(s):  
Wei Hua Ma ◽  
Shi Hui Luo ◽  
Rong Rong Song
Keyword(s):  
Dynamic Model ◽  
Rotation Angle ◽  
Dynamic Performance ◽  
Lateral Force ◽  
Buffer System ◽  
Heavy Haul Train ◽  
Force Transfer ◽  
Heavy Haul ◽  
Brake Force ◽  
Simulation Results

Aimed to wheel flange partial wear problem, the heavy haul train dynamic model was setup, and the coupler and buffer system was setup in detail. The dynamic performance of the train under the longitudinal coupler press force was simulated. The wheel/rail lateral force and wheel flange wear were analyses. Simulation results shown that the front locomotive will suffer a big longitudinal press force for the delay of the brake force transfer; this will lead the rotation of the coupler. The lateral force will apply to the car body at the position of coupler, which was caused by the longitudinal coupler force and the rotation angle of the coupler, then the wheel flange partial wear were induced as a result.

Optimizing structural parameters of carbon fiber braiding carriers based on antlion optimization algorithm

2019 ◽  
Vol 50 (4) ◽  
pp. 460-482
Author(s):  
Xintong Hu ◽  
Lingling Yao ◽  
Yujing Zhang ◽  
Zhuo Meng ◽  
Yize Sun
Keyword(s):  
Carbon Fiber ◽  
Carbon Fibers ◽  
Rotation Angle ◽  
Structural Parameters ◽  
Elastic Coefficient ◽  
Fiber Tension ◽  
Simulation Results ◽  
Antlion Optimization ◽  
Dynamics Models ◽  
The Relationship

Braiding carriers, which are the important parts of a braiding machine, have the functions such as carrying braiding materials, controlling tension of carbon fiber, and driving carbon fiber movement. During the braiding process, two groups of carbon fibers braided in clockwise and counter clockwise direction contact each other and form relative motion, which causes friction and fuzzing. In order to improve this situation, the structural parameters of the carriers need to be optimized. In this paper, the kinematics and dynamics models were established based on the structure of braiding carriers. The micro-element method was used to analyze the relationship between the fiber length released from the yarn barrel, the rotation angle of the lever, and the tension of the carbon fiber. To limit the fluctuant range of carbon fiber tension, and to alleviate the fluffing phenomenon caused by the two groups of carbon fiber in contact with each other, antlion algorithm was used to optimize the structural parameters of braiding carriers. The simulation results showed that the tension of the carbon fiber can meet the processing requirements by adjusting the starting angle of each stage of carrier, the length of lever, the elastic coefficient of springs, and pre-compression of springs. It can be known that the structural parameters of braiding carriers optimized by antlion algorithm could meet the requirement of carbon fiber tension.

Radom Intermediate Points Based Path Planning in Unknown Environment

2013 ◽  
Vol 325-326 ◽  
pp. 1688-1691
Author(s):  
Qi Lei Xu ◽  
Gong You Tang ◽  
Hai Lin Liu ◽  
Shao Ting Ge ◽  
Xue Yang
Keyword(s):  
Path Planning ◽  
Mobile Agent ◽  
Rotation Angle ◽  
Sensor Data ◽  
Unknown Environment ◽  
Current Path ◽  
Movement Distance ◽  
Planning Algorithm ◽  
Simulation Results ◽  
Path Planning Algorithm

This paper presents RandomBug, a novel real-time path planning algorithm, for an autonomous mobile agent in completely unknown environment. According to this algorithm, all the planned paths are described and stored in the form of vectors. When the agent moves along the planned paths, it only considers the rotation angle and the movement distance in a single direction. The algorithm combines range sensor data with a safety radius to determine the blocking obstacles and calculate the shorter path by choosing the random intermediate points. When there is obstacle blocking in the current path, the intermediate points will be calculated randomly and the planned path will be regenerated by inserting the selected random intermediate points. Simulation results are given to show the effectiveness of the proposed algorithm.

scholarly journals RandomBug: Novel Path Planning Algorithm in Unknown Environment

2014 ◽  
Vol 8 (1) ◽  
pp. 252-257 ◽  
Author(s):  
Qi-lei Xu
Keyword(s):  
Path Planning ◽  
Mobile Agent ◽  
Rotation Angle ◽  
Sensor Data ◽  
Unknown Environment ◽  
Current Path ◽  
Movement Distance ◽  
Planning Algorithm ◽  
Simulation Results ◽  
Path Planning Algorithm

This paper presents a novel real-time path planning algorithm for an autonomous mobile agent in completely unknown environment. In this algorithm, all the planned paths are described and stored in the form of vectors in the algorithm. Only the rotation angle and the movement distance in a single direction are considered when the autonomous moves along the planned paths. The algorithm combines range sensor data with a safety radius, which determines the blocking obstacles and calculates a shorter path by choosing the random intermediate points. These random intermediate points are be generated when blocking obstacles exist in the current path. Then the optimal intermediate points are selected and inserted into the current path to regenerate a new planned path. Simulation results are shown that the proposed algorithm is effective.

A NOVEL METHOD TO ANALYZE PHASE DIAGRAMS FOR TRAFFICS ON THE CROSSROAD

2012 ◽  
Vol 23 (10) ◽  
pp. 1250068 ◽  
Author(s):  
QI-LANG LI ◽  
RUI JIANG ◽  
BING-HONG WANG ◽  
MU-REN LIU
Keyword(s):  
Computer Simulation ◽  
Phase Diagrams ◽  
Traffic Flow ◽  
Occupation Probability ◽  
Traffic Model ◽  
Probability Method ◽  
The Novel ◽  
Novel Method ◽  
Simulation Results ◽  
Good Agreement

Traffic flow at a single crossroad consisting of two perpendicular one-lane roads, treated earlier by Ishibashi and Fukui [J. Phys. Soc. Jpn.70, 2793 (2001); 70, 3747 (2001)], has been studied on the basis of the local occupation probability method. However, in this work, based on the novel theoretical analysis and computer simulations, we have studied this crossroad traffic model again and presented the same phase diagrams of traffic flow in the case of various maximum vehicle velocities. We have also derived the flow formulas in all regions in the phase diagrams, which are in good agreement with computer simulation results. Compared with the previous local occupation probability method, our analytical way is simpler and may be widely used for other traffic bottlenecks research.

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