Dynamic Modeling and Analysis of Seven-Bar Seedling Planting Mechanism of Transplanting Machine

2014 ◽  
Vol 574 ◽  
pp. 230-238
Author(s):  
Jian Neng Chen ◽  
Jia Wei Wu ◽  
Jun Ye ◽  
Xiang Fu ◽  
Xiao Fu Fang
Keyword(s):  
Parameter Optimization ◽  
Kinematic Model ◽  
Dynamic Test ◽  
Dynamic Parameter ◽  
Theory Model ◽  
Modeling And Analysis ◽  
Machine Vibration ◽  
Kinematic Theory ◽  
Model And Simulation ◽  
Calculation Results

Seven-bar seedling planting mechanism is one kind of developed transplanting mechanism of vegetable seedling transplanting machines. Dynamic equations of the link rods were established and analysis program was compiled so as to analyze the dynamic characteristics of the mechanism; Meanwhile, simulation model of the mechanism was established and corresponding virtual dynamic test was conducted based on Adams. The consistency between calculation results based on kinematic theory model and simulation results achieved from Adams was proved through comparison, which verified the dynamics model was correct and reliable. It can be concluded that the dynamic model was the basis of dynamic parameter optimization model of seven-bar seedling planting mechanism, which facilitates the parameter optimization process of the kind of seedling planting mechanism with various specifications, and it also avoided the tedious process of repeated modeling based on Adams dynamics optimization. With the analysis results of the seven-bar seedlings planting mechanism based on the established kinematic model, it was found out that the force fluctuation at the chassis caused by the reciprocating motion of the mechanism was large, which could cause machine vibration and increase the labor intensity of operators.

Are speed/accuracy trade-offs caused by neuromotor noise, or not?

1997 ◽  
Vol 20 (2) ◽  
pp. 306-307 ◽  
Author(s):  
Willem P. De Jong ◽  
Gerard P. Van Galen
Keyword(s):  
Kinematic Model ◽  
Psychological Processes ◽  
Trade Off ◽  
Kinematic Theory ◽  
Trade Offs ◽  
Biomechanical Constraints ◽  
Speed Accuracy ◽  
Existing Data ◽  
The Way

Notwithstanding its overwhelming descriptive power for existing data, it is not clear whether the kinematic theory of Plamondon & Alimi could generate new insights into biomechanical constraints and psychological processes underlying the way organisms trade off speed for accuracy. The kinematic model should elaborate on the role of neuromotor noise and on biomechanical strategies for reducing endpoint variability related to such noise.

Detent Force Modeling and Analysis for Vertical Permanent-Magnet Linear Synchronous Motor Using Equivalent Magnetic Network Method

2011 ◽  
Vol 143-144 ◽  
pp. 148-153 ◽  
Author(s):  
Xiao Zhuo Xu ◽  
Xu Dong Wang ◽  
Hai Chao Feng ◽  
Ji Kai Si
Keyword(s):  
Permanent Magnet ◽  
Equivalent Circuit Model ◽  
Synchronous Motor ◽  
Iron Core ◽  
Modeling And Analysis ◽  
Force Modeling ◽  
Detent Force ◽  
Linear Synchronous Motor ◽  
Calculation Results ◽  
Magnetic Network

This paper investigates the detent force modeling of a slotted iron core type vertical permanent magnet linear synchronous motor (PMLSM) for ropeless elevator applications. Variable network non-linear magnetic equivalent circuit model is established to predict the detent force of PMLSM. The topology structure of equivalent magnetic circuit is developed and the permeances are derived and calculated. The end effect of two end teeth is essential for analysis of detent force and it is focused in the modeling. Magnetic saturation of primary iron-core also be taken into account. In final some 3-D finite-element numerical calculation results are used to validate the feasibility of the proposed method.

Error Modeling and Analysis of Articulated Arm Coordinate Measuring Machines

2013 ◽  
Vol 798-799 ◽  
pp. 464-467
Author(s):  
Jian Lu ◽  
Guan Bin Gao ◽  
Hui Ping Yang
Keyword(s):  
Kinematic Model ◽  
Coordinate Measuring Machine ◽  
Calibration Method ◽  
Error Model ◽  
Error Modeling ◽  
Modeling And Analysis ◽  
Low Weight ◽  
New Type ◽  
Measuring Machine ◽  
Value Decomposition

The Articulated Arm Coordinate Measuring Machine (AACMM) is a new type of non-orthogonal system precision instrument with the advantages of large measuring range, small volume, low weight and portability. To improve the measurement accuracy of AACMMs, an error analysis and calibration method for AACMMs is proposed. The kinematic model of the AACMM was established with D-H model, and then the error model of the AACMM was established on the basis of kinematic model with total differential transforming method and the singular value decomposition of Jacobian matrix and the decomposition of orthogonal matrix elementary row transform. Finally, the error model was validated by position error residual calculation. The error model provides a theoretical foundation for calibration and compensation of the AACMM.

Cutting Force Prediction and Simulation for Quasi-Symmetric Milling of the Stator's Inner Helicoid

2013 ◽  
Vol 804 ◽  
pp. 396-399
Author(s):  
Xi Min Liu ◽  
Shu Qiang Wang
Keyword(s):  
Geometric Model ◽  
Cutting Parameters ◽  
Cutting Force Prediction ◽  
Force Prediction ◽  
Model And Simulation ◽  
Calculation Results ◽  
Milling Method ◽  
Prediction And Simulation ◽  
Optimization Of Cutting Parameters ◽  
Method Model

For fixed size disk milling cutter quasi-symmetric milling method of screw stators inner helicoid, geometric model of the cutting is studied and the force prediction formula is derived according to the plasticity theory. The finite element method model and simulation of the cutting process are studied. In the condition with the same cutting parameters, simulation results and the prediction calculation results are compared. It provides data support to the design of transmission mechanism and the optimization of cutting parameters.

Parameter Optimization of Biodegradable Polymer Materials Degradation Model Based on ACO Algorithm

2013 ◽  
Vol 750-752 ◽  
pp. 1511-1514
Author(s):  
Ying Zhang ◽  
Yu Huan Zhang ◽  
Hao Zhang
Keyword(s):  
Comparative Analysis ◽  
Parameter Optimization ◽  
Medical Devices ◽  
Optimization Algorithm ◽  
Biodegradable Polymer ◽  
Polymer Materials ◽  
Ant Colony Optimization Algorithm ◽  
Degradation Model ◽  
Simulation Accuracy ◽  
Calculation Results

To improve the simulation accuracy of biodegradable polymer materials degradation model, a parameter optimization model was proposed, and the ant colony optimization algorithm (ACO) was used to solve the model and optimize undetermined parameters of the model. A comparative analysis of the calculation results was progressed which proved that the simulation accuracy of biodegradable polymer materials degradation of model can be significantly improved by using the optimized parameters. This parameter optimization is propitious to demonstrate the science meaning of degradation mechanization and guide the design and product of medical devices.

Workspace Analysis and Parameter Optimization of 3-DOF Parallel Mechanism

2013 ◽  
Vol 373-375 ◽  
pp. 2136-2142 ◽  
Author(s):  
Rui Fan ◽  
Huan Liu ◽  
Dan Wang
Keyword(s):  
Parameter Optimization ◽  
Parallel Mechanism ◽  
Structural Parameters ◽  
Kinematic Model ◽  
Inverse Kinematic ◽  
Search Method ◽  
Architecture Design ◽  
Original Volume ◽  
Workspace Analysis ◽  
The Relationship

A spatial 3-DOF translational parallel mechanism is analyzed. Its inverse kinematic model is established. The section view of the workspace of the parallel mechanism is presented via boundary search method under the defined constraints. Considering the workspace volume as the optimization object, the relationship between structural parameters and workspace volume is obtained and the structural parameters to be optimized are determined. Finally, the optimization configuration of the mechanism is obtained. The results show that the volume of the workspace increases 1.55 times as much as the original volume, which lay the foundation for the architecture design.

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