Draw a crank phase diagram for three cylinder incline engine with crankshaft. What is the best firing order to given even firing for? · Four stroke cycle engine · Two stroke cycle engine

 Solution

Four stroke cycle

By using the word documents and paint we created this diagram

Crank phase diagram

Problem 2

Draw a crank phase diagram for cylinder engine with  crankshaft. What is the best firing order to given even firing for?

Solution             

Neither the stroke has the even firing with the design. A best firing orders for two strokes is 1, 2, 4, 3 and for four stroke 1,4,3,2.

·         Four stroke cycle engine

Best firing order for four strokes 1,4,3,2.

·         Two stroke cycle engine

Best firing orders for two strokes is 1, 2, 4, and 3                   

Problem 3

Calculate the shaking force, torque and moment balance condition for the first and second harmonic for the engine design in problem 1. The cylinder are every spaced with one unit of distance apart.

Solution

Shaking force

                             Shaking force, torque and moment balance condition is determined for three cylinder engine by crank phase angle of 0,120,240. First and second harmonic conditions are used to determine the force condition, and the engine software is also used to determine the both conditions.

By using phase angle of every cylinder shaking force is calculated and combined for total shaking force; In ideal condition total shaking forces must be zero but values changes with respects to phase angle by following formula ;

Torque

Total Torque; so used this formula;

Moment balance condition

Second harmonic forces balance conditions are = 

Whereas z is spacing length among cylinder of one unit length

Problem 4

Calculate the shaking force, torque and moment balance condition for the first and second harmonic for the engine design in problem 2. The cylinder are every spaced with one unit of distance apart.

Solution

Shaking force, torque and moment balance condition is determined for four cylinder engine by crank phase angle of 0,180. First and second harmonic conditions are used to determine the force condition, and the engine software is also used to determine the both conditions.

By using phase angle of every cylinder shaking force is calculated and combined for total shaking force; In ideal condition total shaking forces must be zero but values changes with respects to phase angle by following formula ;

Torque

 Total Torque; so used this formula;

Moment balance condition