Heading work "Traction calculation of a tracked machine taking into account curvilinear movement"

Contents

INTRODUCTION

2 Traction calculation of caterpillar machine

2.1 Calculation and construction of engine characteristic

2.1.1 Determination of maximum effective engine power

2.1.2 Calculation and construction of engine external speed characteristic

2.1.3 Calculation and construction of engine free power and free torque

2.2 Calculation of transmission characteristics

2.2.1 Calculation of transmission range

2.2.2 Calculation of the number of gears

2.2.3 Calculation of speeds in each transmission

2.2.4 Calculation of transmission gear ratios

2.3 Calculation of traction characteristic of straight machine motion

2.3.1 Calculation of machine speed in gears

2.3.2 Calculation of specific thrust force of the machine

2.4 Calculation of engine acceleration characteristics

2.4.1 Calculation of acceleration characteristics of the machine at the first stage

2.4.2 Calculation of acceleration characteristics of the machine at the second stage

2.4.3 Calculation of acceleration characteristics of the machine at the third stage

2.4.4 Calculation of engine acceleration characteristics in subsequent transmission

2.5 Evaluation of crawler acceleration

3 Calculation of the motion of the tracked machine in the turn

3.1 Calculation of kinematic characteristics of track machine rotation

3.1.1 Determination of the radius of free rotation of the track machine

3.1.2 Determination of the minimum turning radius of the track machine

3.1.3 Calculation of the theoretical turning radii of the track machine

3.2 Calculation of dynamic characteristics of the track machine rotation

3.2.1 Determination of the rotation resistance coefficient

3.2.2 Determination of specific thrust force on running track

3.2.3 Calculation of specific force on lagging track

3.2.4 Calculation of specific thrust required for turning with "ideal" turning mechanism

3.2.5 Calculation of specific force of external resistance to rotation

3.3 Effect of tank drift on its average speed

3.4 Traction characteristic of the track machine taking into account curvilinear movement

CONCLUSION

BIBLIOGRAPHIC LIST

Introduction

In the course design, a number of problems are solved: the maximum engine power is determined, the transmission range is calculated, the maximum speed at each gear is determined, the traction characteristic of the machine at each gear is calculated, and the acceleration time and path traveled by the machine during acceleration are determined.

Also, in the upcoming course project, it is necessary to calculate the motion of the tracked machine in the turn, namely:

Determine the range of possible turning radii of the caterpillar, break it into several parts, determining 5 control points of possible turning radii;

Determine the turning resistance coefficient and specific thrust forces on the lagging and running caterpillars .

Calculate the effect of the tank drift on the average speed of its movement, graphically depict the construction of the speed limit function by drift.

As a result of the construction of the traction characteristics of the tank and the traction characteristic of the rotation of the machine, it is possible to determine the minimum radius of rotation of the track at a given speed and gear. All data required for operation are taken from the initial data table, all calculations are carried out in the SI system.

Conclusion

As a result of the course project, all the assigned tasks for determining the maximum engine power were completed, the transmission range was calculated, the maximum speed at each gear was determined, the traction characteristic of the machine at each of the gears was calculated, and the acceleration time and path traveled by the machine during the acceleration were determined. Graphs of power and torque, traction characteristics of the tracked machine, acceleration of the car and the path traveled during acceleration were built.

The characteristics of the motion of the tracked vehicle in rotation, the average value of the limitation of the speed of the vehicle along the drift of 7.44 m/s, the influence of the tank drift on the average speed and the transmission of the tracked vehicle are also determined.