Calculation and graphic work on the theory of machines and mechanisms "Self-propelled chassis"

Contents

Contents

Contents

Task

Introduction

1. Structural analysis of the mechanism

2. Kinematic analysis

2.1. Kinematic synthesis of crank-slider mechanism

2.2. Outline of provisions

2.3. Speed and Acceleration Plan

2.3.1. Speed Plan

2.3.2. Acceleration Plan

3. Power calculation

3.1. Power calculation of Assur group of the second class

3.1.1.Define inertia forces

3.1.2.Determination of gravity forces

3.1.3. Defining Reactions in Kinematic Pairs

3.2 Power calculation of I class mechanism

3.2.1 Determination of gravity

3.2.2 Determination of reactions in kinematic pairs

3.3 Zhukovsky lever

4. Dynamic calculation

4.1. Determination of given moments of forces

4.2. Determination of kinetic energy of links

List of literature

Introduction

The purpose of this course work is to design and study the crank-slide mechanism.

Speed and Acceleration Plan

The velocity plan is a graphical image in the form of a beam of absolute velocities and points of links and segments connecting the ends of the beams, which are the ratio of the velocity of points in a given position of the mechanism.

Defining an acceleration plan is similar to defining a velocity plan.

Speed and acceleration plans will be considered for the tenth position.

Power calculation

The main task of power calculation is to determine reactions in kinematic pairs of the mechanism and external balancing force (balancing moment), which is a reactive load on the side of the disconnected part of the machine unit.

The basis of force calculation is the Dalamber principle, which allows us to write equations of motion in the form of equilibrium equations when applying inertial load to links. Statically defined kinematic chains (Assur groups) and I class mechanism, i.e. crank link, are considered.

3.1. Power calculation of Assur group of the second class.

To perform a power calculation, you need to know the value of the forces acting on the links of the mechanism: gravity, driving forces and inertia forces of these links.

The power calculation will be carried out for the second position of the crank-slide mechanism.

From the mechanism, starting from the actuator (slider), the Assur group is disconnected, and the break points of this group are replaced by reactions.