Kinematic Analysis and Virtual Design of the Cutter of Seedling Vegetable Harvester

2013 ◽  
Vol 380-384 ◽  
pp. 152-155
Author(s):  
Yi Guo ◽  
Zhi Qiang Li ◽  
Su Bo Tian
Keyword(s):  
Mathematical Model ◽  
Kinematic Analysis ◽  
Theoretical Basis ◽  
Virtual Design ◽  
Cam Mechanism ◽  
Experimental Purpose ◽  
Displacement Speed

[Purpose] To solve problems in design of the cutter for seedling vegetable harvesters, a cutter with a double-eccentric circle cam mechanism has been built. [Method] A mathematical model for kinematic analysis of cutters driven by a double-eccentric circle cam mechanism has been established. Under the model, Matlab has been employed to make kinematic analysis on displacement, speed and acceleration. Also, SolidWorks software has been adopted for virtual design of parts and assemblies of the cutter. [Results] The cutter has been applied to the seedling vegetable harvester for the experimental purpose and turned out to operate reliably and produce uniform height and leveling shearing fracture. [Results] This design will provide theoretical basis and practical reference for relevant researches.

Design and Kinematic Analysis of Reciprocating Cutters

2013 ◽  
Vol 380-384 ◽  
pp. 156-159 ◽  
Author(s):  
Yi Guo ◽  
Zhi Qiang Li
Keyword(s):  
Mathematical Model ◽  
Kinematic Analysis ◽  
Transmission System ◽  
Displacement Velocity ◽  
Linkage Mechanism ◽  
Virtual Design ◽  
Design Problems ◽  
Experimental Purpose ◽  
Related Design

[Purpos] in order to solve design problems of the cutter for the seedling vegetable harvester, a reciprocating cutter with a crank linkage mechanism has been designed. [Metho SolidWorks software has been adopted for virtual design of parts and assemblies of the reciprocating cutter for the seedling vegetable harvester. A mathematical model for kinematic analysis of the cutter taking a crank linkage mechanism as its transmission system has been built. Matlab is used for kinematic analysis on the double-crank linkage mechanism from aspects of displacement, velocity and acceleration of followers. [Result The cutter has been applied to the seedling vegetable harvester for the experimental purpose and turned out to operate reliably and produce uniform height and leveling shearing fracture. [Conclusion Results indicate that the cutter has been reasonably designed, which will provide theoretical and practical basis for related design.

scholarly journals Kinematic parameters of goats walking on different slopes and biomimetic walking mechanisms

2017 ◽  
Author(s):  
Fu Zhang ◽  
Yafei Wang ◽  
Wei Wang ◽  
Keyword(s):  
Experimental Data ◽  
Theoretical Basis ◽  
High Speed ◽  
Rate Of Change ◽  
Kinematic Parameters ◽  
High Speed Video ◽  
Experimental Image ◽  
Displacement Speed ◽  
Walking Mechanism ◽  
Uphill Walking

A comparative analysis of the kinematic parameters of a goat on different slopes was conducted to study the kinematic parameters of goats on different slopes with walking mechanics. The uphill walking processes on different slopes (0°, 5°, 10°, 15°, 20°, 25° and 30°) were recorded by a high speed video system (VRI Phantom M110). The experimental image results were processed and analyzed using PCC and MATLAB software. The kinematic parameters were obtained from the goat walking on different slopes; these parameters are the changes of centroid with displacement, speed with time, and acceleration with time. As the gradient in the uphill process increases, the range of centroid fluctuation ranges from 0.079 to 0.59 and the rate of change ranges from 0.4 to 2.2 m/s, while the acceleration of the goat slope decreases. The present research can provide theoretical basis and experimental data for the design of a biomimetic agricultural slope walking mechanism.

scholarly journals Study on the Mathematical Model of Vacuum Breaker Valve for Large Air Mass Conditions

Water ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1358
Author(s):  
Zhang ◽  
Fan ◽  
Yu ◽  
Zhang ◽  
Lv ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Theoretical Basis ◽  
Isothermal Process ◽  
Air Mass ◽  
Protection Scheme ◽  
Calculation Results ◽  
Air Valve ◽  
The Mathematical Model ◽  
Valve Model ◽  
Derivation Process

The mathematical model of vacuum breaker valve is significant to the protection scheme. The more accurate the vacuum breaker valve model, the more reliable the calculation results. In this study, the application conditions of the air valve model are analyzed according to the assumptions used in the derivation, and the contradictions between these assumptions are proposed. Then, according to the different working characteristics between the vacuum breaker valve on the siphon outlet pipe and the air valve, the vacuum breaker valve model is deduced based on the modified assumptions. In the derivation process, the thermodynamic change of the gas in the vacuum breaker valve is assumed to follow the isentropic process rather than an isothermal process, and the water level in the vacuum breaker valve is considered to be changeable. An engineering case is introduced, and the results calculated according to the vacuum breaker valve model are compared with those resulting from the air valve model. The results indicate that the vacuum breaker valve model is suitable for large air mass conditions and can provide a theoretical basis for the numerical simulation and settings of vacuum breaker valves.

Research on Traction Characteristics Model of High-Powered Tractor

2011 ◽  
Vol 143-144 ◽  
pp. 79-84
Author(s):  
Peng Jun Mao ◽  
Wen Jie Gao ◽  
Shui Liang Li ◽  
Chun Yan Hu ◽  
Fu Zhang
Keyword(s):  
Mathematical Model ◽  
Theoretical Basis ◽  
Characteristic Curve ◽  
Traction Force ◽  
Operating Conditions ◽  
Traction Characteristic

Through an analysis of tractor traction balance, a mathematical model which can easily calculate the traction force and efficiency of tractors under different operating conditions was built up, this model offers a basis for tractor-implement matching. Bases on above analyses, the best efficiency rating value was deduced and the traction characteristic curve was also plotted, this study provides a theoretical basis for tractor traction characteristic research.

Experimental Study on the Surface Roughness in Mesoscopic-Scale Grinding of Nickel-Based Superalloy

2016 ◽  
Vol 1136 ◽  
pp. 9-14
Author(s):  
Yun Guang Zhou ◽  
Ya Dong Gong ◽  
Yang Sun ◽  
Zhong Xiao Zhu ◽  
Qi Gao
Keyword(s):  
Mathematical Model ◽  
Surface Roughness ◽  
Feed Rate ◽  
Theoretical Basis ◽  
Spindle Speed ◽  
Range Analysis ◽  
Mesoscopic Scale ◽  
Nickel Based Superalloy ◽  
Grinding Parameters ◽  
Grinding Tool

This paper uses micro-grinding tool with 500# grains and 0.9 mm diameter to grind nickel-based superalloy Inconel600 through three factors(grinding depth, feed rate, spindle speed ) at three levels orthogonal grinding experiment in mesoscopic scale. Then according to the range analysis of surface roughness, the primary and secondary influencial factors are found; the micro grinding parameters are optimized ,the results show: the influence of the feed rate(vf)is the biggest, followed by the spindle speed(n), the grinding depth(ap) is minimal, when n=50kr/min, vf=100μm/s, ap=6μm, the grinding surface roughness is minimum: Ra=579nm; finally , the regression mathematical model of micro grinding surface roughness is established, the relative error of the calculated value and experimental measurements is low, showing that this regression mathematical model is accurate and effective. This study provides a theoretical basis for the micro grinding parameters and surface quality control of nickel-based superally.

Configuration Design and Displacement Analysis of a Novel Decoupled 3T2R Parallel Robot

2011 ◽  
Vol 308-310 ◽  
pp. 2037-2041
Author(s):  
Zhi Xin Shi ◽  
Mei Yan Ye
Keyword(s):  
Kinematic Analysis ◽  
Topological Structure ◽  
Theoretical Basis ◽  
Parallel Robot ◽  
Configuration Design ◽  
Displacement Analysis ◽  
Position And Orientation

Based on the control decoupled principle and approach of Position and Orientation Characteristic (in short, POC) set, a novel decoupled parallel robot with 3-Translation and 2-Rotation (in short, 3T2R) outputs has been presented in the paper. And the topological structure of this new mechanism is fully decoupled, which have the advantages of easily control, simple kinematic analysis, and so on. Then the structure and displacement analysis of this novel parallel robot have been accomplished. The research provides theoretical basis for design and practical applicability of this novel parallel robot.

Web Based Virtual Design of Dynamics of Roller Gear Cam System

2004 ◽  
Vol 471-472 ◽  
pp. 677-681
Author(s):  
Yi Qi Zhou ◽  
Wei Xiao Tang ◽  
H. Zhang ◽  
B.C. Shi
Keyword(s):  
Control System ◽  
Dynamics Simulation ◽  
Design System ◽  
Prototype System ◽  
Virtual Model ◽  
Virtual Design ◽  
Web Based ◽  
Cam Mechanism ◽  
Interactive Dynamics ◽  
Network Platform

The remote virtual design system based on B/S framework is investigated in the paper. On reviewing the current virtual design system situation, the control system dynamics simulation is integrated into the virtual design system of roller gear cam mechanism. Simulink and Matlabserver are employed to realize the dynamics simulation for the system, and COM and VRML technologies are used to browse the virtual model on the network platform. The prototype system indicates that the system can serve as an effective tool for designing roller gear cam mechanism with the better properties of interactive dynamics performance design and expansion usage.

Research on Acoustic Emission Model of Rotor Crack Propagation

2011 ◽  
Vol 216 ◽  
pp. 206-211
Author(s):  
Xue Jun Li ◽  
Zong Qun Deng ◽  
Ji Gang Wu
Keyword(s):  
Mathematical Model ◽  
Acoustic Emission ◽  
Fault Detection ◽  
Fracture Mechanics ◽  
Crack Propagation ◽  
Stress Analysis ◽  
Theoretical Basis ◽  
Power Relationship ◽  
Emission Model ◽  
Energy Theory

From the basic theory of fracture mechanics and combining the fatigue mechanism of rotor crack propagation, energy theory and power relationship, the stress analysis and deformation of the rotor are discussed, and the acoustic emission mathematical model of the rotor crack propagation is deduced, which will provide the theoretical basis for the further study of the acoustic emission in the rotor crack fault detection.

Spraying Pattern Overlap and Movement Design of Automatic Electrostatic Top Spraying Machine

2013 ◽  
Vol 365-366 ◽  
pp. 37-41
Author(s):  
Hong Zhi Han ◽  
Yan Song An ◽  
Da Wei Zhang ◽  
Wei Zhu
Keyword(s):  
Mathematical Model ◽  
Trajectory Planning ◽  
Theoretical Basis ◽  
High Speed ◽  
Automatic Machine ◽  
Working Principle ◽  
Automotive Coating ◽  
Electrostatic Spray ◽  
Coating Line ◽  
Simplified Mathematical Model

The high-speed spinning bell electrostatic automatic machine is the key equipment of the automotive coating line. A simplified mathematical model of the process of spraying aggradation was proposed by analyzing the working principle of electrostatic spray. Furthermore, the relationships among spraying distance, spraying speed and number of spraying pattern overlap were investigated and revealed. And the expressions for the velocities of both side spraying machine and top spraying machine are derived. This work provides an important theoretical basis for the spraying trajectory planning .

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