Dynamic Analysis on the Longitudinal Roadheader’s Cutting System

2012 ◽  
Vol 619 ◽  
pp. 160-163
Author(s):  
Xiao Hua Wei ◽  
Miao Xie
Keyword(s):  
Dynamic Analysis ◽  
Physical Model ◽  
Dynamic Model ◽  
Working Conditions ◽  
Computer Analysis ◽  
Matlab Simulink ◽  
Actual Working ◽  
Cutting System

The cutting system of the longitudinal roadheader is simplified to get the physical model. And the dynamic model is obtained on the basis of that. Then the simulating model is established by using Matlab/Simulink. Furthermore, the relative technical variants are analyzed and determined. Computer analysis is performed by setting some parameters which conform to the actual working conditions.

scholarly journals Travel Dynamics Analysis and Intelligent Path Rectification Planning of a Roadheader on a Roadway

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 7201
Author(s):  
Xiaodong Ji ◽  
Minjun Zhang ◽  
Yuanyuan Qu ◽  
Hai Jiang ◽  
Miao Wu
Keyword(s):  
Dynamic Model ◽  
Working Conditions ◽  
Field Experiments ◽  
Dynamic Models ◽  
Driving Performance ◽  
Obstacle Crossing ◽  
Grid Model ◽  
Actual Working ◽  
Modeling Analysis ◽  
Dip Angle

The tunneling work belongs to the group operation of semi-closed space, and the work is difficult with a high risk coefficient. It is an urgent requirement of coal mining to achieve unmanned and intelligent tunneling work. The path rectification planning of roadheaders is a necessary step before roadway cutting. In the traditional dynamic modeling analysis of roadhead tracks, problems such as compaction resistance, bulldozing resistance, steering resistance, tunnel dip angle, ditching, and obstacle-crossing capacity are not considered. In order to approximate the kinematic and dynamic parameters of a roadheader’s deviation correction under actual working conditions, this paper establishes kinematic and dynamic models of a roadheader’s path rectification at low speeds and under complex working conditions, and calculates the obstacle-crossing ability of roadheaders in the course of path rectification by modes based on roadway conditions, crawler resistance, and driving performance of the roadheader. Field experiments were carried out to verify the effectiveness of the dynamic model. The dynamic roadheader model was used in combination with actual working conditions of roadways in order to establish a roadway grid model. The grid model was simplified using rectifying influence degree and distance cost. The roadheader dynamic model and grid model were then used to propose a path rectification planning and tracking algorithm based on particle swarm optimization of the actual roadway conditions and roadheader driving performance. Finally, the effectiveness and superiority of the algorithm were verified using MATLAB simulation. The algorithm can provide strong technical guarantee for the intelligence of roadheader and unmanned mining. The results presented here can provide theoretical and technical support for the structural optimization and intelligent travel control of roadheaders.

Research on Dynamic Characteristics of Implement Mechanism of Mining Excavator

2012 ◽  
Vol 229-231 ◽  
pp. 512-516 ◽  
Author(s):  
Wei Kang Kong ◽  
Jia Xin Liu ◽  
Ming Hui Ma
Keyword(s):  
Dynamic Analysis ◽  
Dynamic Model ◽  
Dynamic Characteristics ◽  
Matlab Simulink ◽  
Lagrange’S Equation ◽  
Working Cycle

This paper works on the dynamic characteristics of implement mechanism of mining excavator. The dynamic model of the working implement is established based on the application of Lagrange's equation. Digging resistant force, crowd force and ore gravity were discussed in detail. A full working cycle is simulated by using Matlab/Simulink. The results show the validity of the established dynamic model and the importance of the dynamic analysis for the mining excavator.

The Effect of Roller Profile Modification on Roller Bearing Performance

2011 ◽  
Vol 230-232 ◽  
pp. 1210-1215 ◽  
Author(s):  
Li Qin Wang ◽  
Zhen Huan Ye ◽  
Le Gu
Keyword(s):  
Dynamic Analysis ◽  
Dynamic Model ◽  
Working Conditions ◽  
Load Distribution ◽  
Roller Bearing ◽  
Dynamic Parameters ◽  
Profile Modification ◽  
Optimal Direction ◽  
Modification Method ◽  
Roller Profile

According to roller profile modification method, several commonly used modified rollers were selected into the bearing dynamic analysis combined with dynamic model of bearing. As the three types of modified roller an example, simulation program was established to analyze the load distribution of loaded roller under the working conditions of upright loading and offset loading of bearing, respectively. The effects of modified roller on bearing dynamic parameters were discussed. The results provided optimal direction for bearing selection and design under different working conditions.

BUILDING A DYNAMIC MODEL OF A HELICOPTER POWER SUPPLY SYSTEM

2019 ◽  
Author(s):  
Dmitriy Krasnov ◽  
Vyacheslav Novoselsky
Keyword(s):  
Dynamic Model ◽  
Power Supply ◽  
Power Supply System ◽  
Supply System ◽  
Dynamical Model ◽  
Matlab Simulink

This work is devoted to the analysis of the possibility of constructing a dynamical model of a helicopter power supply system in the MATLAB SIMULINK program.

BENDING OF A SUBTLE-FINISHED PLATE ON ELASTIC BASE WITH SPECIAL CONDITIONS OF ITS WORK

2019 ◽  
pp. 424-430
Author(s):  
A. T. Marufiy ◽  
A. S. Kalykov
Keyword(s):  
Analytical Solution ◽  
Working Conditions ◽  
Fourier Transforms ◽  
Infinite Plate ◽  
Elastic Base ◽  
Generalized Solutions ◽  
Middle Plane ◽  
Actual Working

In this article, an analytical solution is obtained for the problem of bending a semi-infinite plate on an elastic Winkler base, taking into account incomplete contact with the base and the influence of longitudinal forces applied in the middle plane of the plate. The analytical solution is obtained by the method of generalized solutions using integral Fourier transforms. Any analytical solution is the result, approaching the actual working conditions of the designed structures.

A Stochastic Approach to Characterization of Machine Tool System Dynamics Under Actual Working Conditions

1976 ◽  
Vol 98 (2) ◽  
pp. 614-619 ◽  
Author(s):  
F. A. Burney ◽  
S. M. Pandit ◽  
S. M. Wu
Keyword(s):  
Machine Tool ◽  
Working Conditions ◽  
Stochastic Approach ◽  
Relative Displacement ◽  
Process Dynamics ◽  
Actual Working ◽  
Machine Tool Structure ◽  
Vertical Milling ◽  
Vertical Milling Machine ◽  
Tool Dynamics

The machine tool dynamics is evaluated under actual working conditions by using a time series technique. This technique develops mathematical models from only one signal, viz., the relative displacement between the cutter and the workpiece. Analysis of the experimental data collected on a vertical milling machine indicates that the new methodology is capable of characterizing the machine tool structure and the cutting process dynamics separately. Furthermore, it can also detect and quantify the interaction between these two subsystems.

Analysis of Jib Strength and Broken Jib Accident of High Pedestal Jib Crane from the Perspective of Mechanics

2012 ◽  
Vol 164 ◽  
pp. 322-325 ◽  
Author(s):  
Qing Dun Zeng ◽  
Fang Liu
Keyword(s):  
Finite Element ◽  
Working Conditions ◽  
Tensile Force ◽  
Compressive Force ◽  
Guangdong Province ◽  
Solid Model ◽  
Finite Element Software ◽  
Actual Working

According to an example of the broken jib accident of a high pedestal jib crane (HM2564) in a Shipyard Co., Ltd. in Guangdong province, this paper used a finite element software ANSYS to establish a solid model for the jib frame of the crane, calculated the stresses of jib system under various actual working conditions and checked the strengths. Simultaneously, the reasons of broken jib were quantitatively analyzed from the perspective of mechanics. The results show that the strengths of the jib system meet the requirements of safe use under all kinds of working conditions, but the related hoistman incorrectly operated the facility, cables can’t be winded normally in pulleys, thus resulting in that the tensile force of a cable was directly applied on the main jib by pulley spindle and the failure of the jib frame occurred under heavy compressive force of lifting cables.

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