Kinematic Optimization of Transplanting Mechanism with B-Spline Curve Gear for Rice Pot Seedling Based on Matlab

2014 ◽  
Vol 624 ◽  
pp. 181-186
Author(s):  
Yan Jun Zuo ◽  
Xiao Xu Yu ◽  
Wen Ge Li ◽  
Hui Xuan Zhu ◽  
Hai Peng Ji
Keyword(s):  
Structural Parameters ◽  
Planetary Gear ◽  
Gear Train ◽  
Virtual Experiment ◽  
B Spline ◽  
Spline Curve ◽  
Data Points ◽  
Pitch Curve ◽  
Machine Interaction ◽  
Kinematic Optimization

In order to realize the mechanized transplanting of rice pot seedling and ensure our food security, The pitch curve of non-circular gear is fitted based on cubic, non-uniform and rational B-spline curve. The planetary gear train transplanting mechanism has been invented for ride type, and kinematics mathematical model has been built through the kinematics analysis of transplanting mechanism. The computer aided analytical and optimized software has been developed by using software platform of Matlab. Through tuning the data points by man-machine interaction, pitch curve of non-circular gear is optimized and structural parameters are obtained, which can meet the demand of track and attitude in the transplanting process for rice pot seedling. In condition of the parameters, the correctness of the established model is verified by the virtual experiment by software of Adams.

Kinematic Optimization of Corn Full-Automatic Transplanting Mechanism with Non-Circular Gears Based on Matlab

2014 ◽  
Vol 635-637 ◽  
pp. 1408-1411
Author(s):  
Yan Jun Zuo ◽  
Wen Ge Li
Keyword(s):  
Mathematical Model ◽  
Structural Parameters ◽  
Economic Benefits ◽  
B Spline ◽  
Computer Aided ◽  
Data Points ◽  
Pitch Curve ◽  
Machine Interaction ◽  
Kinematic Optimization

In order to guarantee the high and stable yields, improve the economic benefits and promote the transplanting technology of corn. The pitch curve of non-circular gear is fitted based on quasi uniform B-spline theory, corn full-automatic transplanting mechanism has been invented, and its kinematics mathematical model has been built through analysis of transplanting mechanism. The computer aided analytical and optimized software has been developed on software Matlab’s platform. Through tuning the data points by man-machine interaction, pitch curve of non-circular gear and structural parameters are optimized, until track and attitude of mechanism meet the demands for corn transplanting process. The 3 actions of taking, transportation and planting corn transplantation can be achieved orderly by a mechanism.

scholarly journals Design of Vegetable Pot Seedling Pick-up Mechanism with Planetary Gear Train

2020 ◽  
Vol 33 (1) ◽  
Author(s):  
Zhipeng Tong ◽  
Gaohong Yu ◽  
Xiong Zhao ◽  
Pengfei Liu ◽  
Bingliang Ye
Keyword(s):  
Design Method ◽  
Planetary Gear ◽  
Gear Train ◽  
Dimensional Synthesis ◽  
Planetary Gear Train ◽  
Key Points ◽  
Physical Prototype ◽  
Noncircular Gears ◽  
Pitch Curve ◽  
Parameter Values

Abstract It has been challenging to design seedling pick-up mechanism based on given key points and trajectories, because it involves dimensional synthesis and rod length optimization. In this paper, the dimensional synthesis of seedling pick-up mechanism with planetary gear train was studied based on the data of given key points and the trajectory of the endpoint of seedling pick-up mechanism. Given the positions and orientations requirements of the five key points, the study first conducted a dimensional synthesis of the linkage size and center of rotation. The next steps were to select a reasonable solution and optimize the data values based on the ideal seedling trajectory. The link motion was driven by the planetary gear train of the two-stage gear. Four pitch curves of noncircular gears were obtained by calculating and distributing the transmission ratio according to the data. For the pitch curve with two convex points, the tooth profile design method of incomplete noncircular gear was applied. The seedling pick-up mechanism was tested by a virtual prototype and a physical prototype designed with the obtained parameter values. The results were consistent with the theoretical design requirements, confirming that the mechanism meets the expected requirements for picking seedlings up. This paper presents a new design method of vegetable pot seedling pick-up mechanism for an automatic vegetable transplanter.

Study on a Kind of Active Balancer Using Planetary Gear Train

2014 ◽  
Vol 701-702 ◽  
pp. 761-768
Author(s):  
Ying Zhang ◽  
Chong Peng ◽  
Yu Dong Wang
Keyword(s):  
Working Conditions ◽  
Structural Parameters ◽  
Dynamic Performance ◽  
Design Procedure ◽  
Planetary Gear ◽  
Gear Train ◽  
Original Structure ◽  
Dynamic Balancing ◽  
Planetary Gear Train ◽  
Structure And Motion

A kind of active balancer using planetary gear train was developed as a solution for dynamic balancing, aiming to balance the mechanisms actively and bring little changes to their original structure and motion. It consists of a two-DOF planetary gear train and a controllable motor. One of the two inputs doubles as the output, connected to the machine to be balanced. The other input is driven by the control motor. The conceptual design of the proposed balancer was discussed. Taking one scheme as example, design procedure of the balancer was introduced. Numerical examples were given to demonstrate the effectiveness of the proposed balancer. The results showed that much more flexibility on the dynamic performance under different working conditions were achieved by selecting suitable input speed trajectories and structural parameters of the planetary gear train of the active balancer.

Novel Gear Transmission Mechanism With Twice Unequal Amplitude Transmission Ratio

2019 ◽  
Vol 141 (9) ◽  
Author(s):  
Gaohong Yu ◽  
Zhipeng Tong ◽  
Liang Sun ◽  
Junhua Tong ◽  
Xiong Zhao
Keyword(s):  
Structural Characteristics ◽  
Angular Displacement ◽  
Planetary Gear ◽  
Gear Transmission ◽  
Transmission Mechanism ◽  
Gear Train ◽  
Transmission Ratio ◽  
Gear Pair ◽  
Pitch Curve ◽  
Gear Rack

The operation effectiveness of multi-bar transplanting mechanisms is low, and the specific changing law of the transmission ratio (the curve of the transmission ratio has twice unequal amplitude [TUA] fluctuation.), which is needed in vegetable pot seedling transplanting, is difficult to fulfill using a planetary gear train with noncircular gears and a single-planet carrier. To address this problem, we propose a noncircular gear pair that comprises an incomplete noncircular gear, rack, partial noncircular gear, and elliptical gear. The structural characteristics and the working principle of the TUA gear pair were analyzed. The pitch curve equation of the noncircular TUA gears was derived from the relationship of the angular displacement of the corresponding pitch curves. The influence of central angle α and eccentricity k on the shape of the pitch curve, angular displacement, and transmission ratio of the TUA gear pair was analyzed. The TUA gear pair was applied to a proposed vegetable seedling pickup mechanism (SPM) considering the design requirements. Finally, the feasibility of the new noncircular TUA gear transmission mechanism was verified by an SPM test.

On the Modeling and Analysis of an Improved CNC Interpolation Algorithm

2009 ◽  
Vol 626-627 ◽  
pp. 459-464 ◽  
Author(s):  
Lei Luo ◽  
L. Wang ◽  
Jun Hu
Keyword(s):  
Interpolation Method ◽  
Control Points ◽  
Interpolation Algorithm ◽  
Modeling And Analysis ◽  
B Spline ◽  
Spline Curve ◽  
Spline Surface ◽  
Cnc Interpolation ◽  
Data Points ◽  
Back Calculation

An improved interpolation method is presented based on B-spline curve back calculation which regards data points as control points. First, a B-spline surface reconstruction is done, and a favorable condition for real-time interpolation can be provided for NC machining. Then, by prejudging the trajectory feedrate, the tangent vectors of spline curve junction can be calculated, which can be used to establish the spline curve equations based on time. At last, with the equations mentioned above, the trajectory and feedrate profile can be generated simultaneously by the improved interpolation algorithm. An error analysis is also discussed and the feasibility of the improved algorithm is verified by the simulation results.

scholarly journals Firefly Algorithm for Explicit B-Spline Curve Fitting to Data Points

2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
Akemi Gálvez ◽  
Andrés Iglesias
Keyword(s):  
Firefly Algorithm ◽  
Optimization Problem ◽  
Nonlinear Least Squares ◽  
Well Being ◽  
B Spline ◽  
Spline Curve ◽  
Spline Fitting ◽  
Nature Inspired Algorithm ◽  
Data Points ◽  
High Degree

This paper introduces a new method to compute the approximating explicit B-spline curve to a given set of noisy data points. The proposed method computes all parameters of the B-spline fitting curve of a given order. This requires to solve a difficult continuous, multimodal, and multivariate nonlinear least-squares optimization problem. In our approach, this optimization problem is solved by applying the firefly algorithm, a powerful metaheuristic nature-inspired algorithm well suited for optimization. The method has been applied to three illustrative real-world engineering examples from different fields. Our experimental results show that the presented method performs very well, being able to fit the data points with a high degree of accuracy. Furthermore, our scheme outperforms some popular previous approaches in terms of different fitting error criteria.

Study of a New Stair-Climbing and Obstacle-Traversing Robot

2011 ◽  
Vol 211-212 ◽  
pp. 686-690
Author(s):  
Long Wang Yue ◽  
Ke Yan Wu ◽  
Chun Bo Liu
Keyword(s):  
Control System ◽  
Interaction Model ◽  
Planetary Gear ◽  
Working Environment ◽  
Gear Train ◽  
Stair Climbing ◽  
Robot System ◽  
Human Machine Interaction ◽  
Machine Interaction ◽  
Automatic Switching

The author introduced a new stair-climbing and obstacle-traversing robot system. According to its working environment, the parameters of driving wheels were determined with the optimization target of rotation axis’s undulation amplitude; The gear ratios of the driving planetary gear train were determined by running resistance, which can realize the automatic switching between rotation and revolution; According to its applicable situation, the robot’s control system was designed as a human-machine interaction model.

Trajectory Model of J-Type Groove and its Curve Fitting of B-Spline

2011 ◽  
Vol 58-60 ◽  
pp. 1396-1401
Author(s):  
Chang Liang Chen ◽  
Sheng Sun Hu ◽  
Dong Lin He
Keyword(s):  
High Efficiency ◽  
Control Points ◽  
Mathematical Relationship ◽  
Terminal Position ◽  
C Language ◽  
B Spline ◽  
Spline Curve ◽  
Accuracy And Precision ◽  
Data Points ◽  
Intersecting Curve

This paper describes the complexity and particularity of the trajectory of tube-sphere intersection and derives mathematical model of the track; according to characteristics of B-Spline curve, the track intersecting curve is partitioned ,and determine the mathematical relationship between the control points (deBoor point) and the data points of J-type groove; using cubic non-uniform irrational B-Spline theory, generate segments of approximation curves, then first and last point of each segment are constrained, so that combination curves can be seen as a whole curve with C1continuity; programming the trajectory of the preprocess module with C# language, it has advantages of approximate accuracy and high efficiency, thereby it can increase accuracy and precision of welding terminal position, so that the overall system has a metronomic characteristic.

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