Mechanical Systems: Analysis of Engine Crane, Chair Structure, Industrial Robot, Ski, Sign Post and Diving Board

Running head: MECHANICAL SYSTEMS 1
Mechanical Systems
Name
Institution Affiliation
1. ENGINE CRANE.
.Description and functions
The engine crane is a familiar tool that is used to remove or install
diesel engines and gasoline engines in crowded and small vehicle
compartments. This mechanical structure is commonly found in
repair workshops and sometimes it is known as engine hoist.
Photo of the engine crane

MECHANICAL SYSTEMS 2
Photo and sketches of an element from the engine crane
Element ABC selected from the crane engine
A 3ft B 5ft C
Calculating the sectional property of the element
A 3ft B 5ft C

MECHANICAL SYSTEMS 3
200lb
Taking reaction about point A;
FA = FB – FC =0
FA = FC -FB
Taking the moments about point A;
 MA = 3ft (FB) – 8ft (200lb)
0 = 3ft (FB) – 1600ft-lb
FB = 3
1600
=533.33lb
FA = FC -FB
= 200-533.33
=- 333.33lb
Estimate of the maximum bending stress throughout the element
To estimate the maximum bending stress throughout the entire system, we
constructed the shear diagram of the element.

MECHANICAL SYSTEMS 4
Maximum bending stress occurs at B according to our sheer diagram;
Maximum Stress = -333.33 -200
= 533.33 lb
Estimate the possible place where maximum beam deflection occurs.
From the shear diagram constructed for the element using the forces acting
on it, it can be seen that point B is the place where maximum beam
deflection is going to be experience in the system.
2. The Chair Structure.
Description and functions
A chair is simple mechanical structure that is designed for people to seat on
it and is used all over the word. There are various types of chairs in the
universe. The main function of the chair is to provide support to the
individual(s) seating on it.
Photos of a chair