scholarly journals Dynamic Analysis of Shearer Traction Unit Considering the Longitudinal Swing

Energies ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 5293
Author(s):  
Dejian Ma ◽  
Xin Zhang ◽  
Lirong Wan ◽  
Qingliang Zeng ◽  
Hongen Ge
Keyword(s):  
Dynamic Analysis ◽  
Dynamic Model ◽  
Contact Force ◽  
Load Distribution ◽  
Structure Optimization ◽  
Lateral Load ◽  
Depression Angle ◽  
Increasing Trend ◽  
Traction Unit ◽  
Supporting Force

Shearer traction failure occurs frequently, which seriously restricts the safe and efficient mining of coal. However, the influence of the shearer’s posture on traction has not been fully considered in the existing research. To improve traction reliability: the dynamic model of the traction unit is established considering longitudinal swing; the walking characteristics of the shearer and the dynamics of the traction unit are analyzed; and the influences of traction velocity, drum load cutting arm angle, and depression angle are discussed. The results show that the longitudinal swing is reciprocating and the positive swing is more serious. With the increase of the traction velocity, the walking stability of the shearer decreases while the contact force increases, especially the support slipper. The longitudinal swing increases with the increase of lateral load, but the supporting force of the support slipper decreases with the increase of cutting load. The forces of the walking wheel and the support slipper show an increasing trend with the increase of cutting arm angle. When the depression angle is 5–10°, the load distribution of the contact components of the traction unit is more balanced. The results provide a reference for the structure optimization of the shearer and the layout of coalface.

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.

Contact Analysis of Truss Bridge Inspection Vehicle’s Oriented Rollers

2012 ◽  
Vol 538-541 ◽  
pp. 651-654
Author(s):  
Xiao Wu ◽  
Xiao Le Hu
Keyword(s):  
Dynamic Analysis ◽  
Dynamic Model ◽  
Contact Force ◽  
Contact Forces ◽  
Actual Situation ◽  
Bridge Inspection ◽  
Simulation Process ◽  
Force Curves ◽  
Set Up ◽  
Truss Bridge

Since that rollers of a certain type of bridge inspect vehicle were worn seriously in the process of using, a multi-contact dynamic model was set up utilizing ADAMS and SolidWorks. The Poison Model was used to describe the contact relationship between rollers and vertical truss. After dynamic analysis and calculation of contact forces by ADAMS, time-contact force curves were drawn. The curves proved that the results were consistent with the actual situation, so that the simulation process was verified.

Lateral Load Distribution in Curved Steel I-Girder Bridges

2005 ◽  
Vol 10 (3) ◽  
pp. 281-290 ◽  
Author(s):  
Hailing Zhang ◽  
Dongzhou Huang ◽  
Ton-Lo Wang
Keyword(s):  
Load Distribution ◽  
Lateral Load ◽  
Girder Bridges ◽  
Lateral Load Distribution ◽  
Curved Steel

AN APPROACH METHOD FOR THE DYNAMIC ANALYSIS OF THE AMPHIBIOUS RIFLE WHEN SHOOTING UNDER-WATER

2020 ◽  
pp. 103-116
Author(s):  
Nguyen Van Hung
Keyword(s):  
Dynamic Analysis ◽  
Dynamic Model ◽  
Automatic System ◽  
Structural Parameters ◽  
Research Project ◽  
Approach Method

This paper focuses on establishing the dynamic model describing the motion of bolt-carrier for the amphibious rifles when shooting under-water. This dynamic model is applied for the 5.56 mm amphibious rifle designed by the research project of the ministry of defense. The model in this paper can be applied to study the influence of the structural parameters in rifles on the operation of the automatic system during shooting under-water and contributing to the adjustment, optimization designs.

Dynamic Modeling of a Multi-Legged Robotic Vehicle: Part 2 — Dynamic Analysis

1987 ◽  
Author(s):  
R. A. Hart ◽  
N. D. Ebrahimi
Keyword(s):  
Dynamic Analysis ◽  
Dynamic Model ◽  
Dynamic Modeling ◽  
Kinetic Equations ◽  
Euler Method ◽  
Degree Of Freedom ◽  
Time Response ◽  
Robotic Vehicle

Abstract In Part 1 of this report, we described the overall objective of the investigation; that is, the formulation of a dynamic model for determining the time response of a multi-legged robotic vehicle traveling on a variable-topographic terrain. Specifically, we developed expressions for the joint variables, and their rates, which are essential for describing the system’s links orientations, velocities, and accelerations. This procedure enabled us to determine the kinematic quantities associated with the entire vehicular system in accordance with the Newton-Euler method. In the present paper, we formulate the kinetic equations for the multi-degree-of-freedom leg assemblies, the rigid wheels, and the platform of the vehicle to achieve the prescribed motion and corresponding configuration of the system.

Sign in / Sign up

Export Citation Format

Share Document