Introduction Flashcards
means a device that transmits or modifies force or motion to do useful work.
Machine
an assembly of mechanical components to achieve a particular motion
Mechanism
A word that emphasizes the motion
Mechanism
A word that points to the work done
Machine
the study of motion without regard for the forces involved in the motion.
Kinematics
A body that remains undeformed, no matter what loads are imposed to it
Rigid body
If an extension of one body is only allowed to move in such a way that it
is guided by a rail, a groove, or similar rigid boundary on the second body, this is
called a ______ because it slides along the guide
Slider
This is the property that resists acceleration when a body is acted upon by
a non-zero net force,
Mass
number of independent variables that are required to describe the position of a mechanical
system.
Degrees of freedom
For a system of N particles in two dimensions and subject to M constraints, the number of degrees of freedom is 2N
Assumption for DOF
For a rigid body having 4 particles, and 3 constraints, what is the degrees of freedom?
5 (2N-M)
If the plan results in the creation of something having a physical reality, then the product must be__________
Functional, safe, reliable, competitive, usable, manufactureable, and marketable
A classification of machine design where in there is no need of special knowledge or skills and can be attempted by designers of ordinary technical training. The designer only makes minor iteration or modification in the existing designs of the product
Adaptive design
This type of design needs considerable scientific training and design ability in order to modify the existing designs into a new idea by adopting a new material or different method of manufacture.
Development design
This type of design needs a lot of research, technical ability and creative thinking
New design
The design that depends upon mathematical formulae of principle of mechanics
Rational design
This type of design depends upon empirical formulae based on the practice and past experience
Empirical design
This type of design depends upon of the production and aspects to manufacture any machine component in the industry
Industrial design
It is a the best design for the given objective function under the specified constraints it may be achieved by minimizing the undesirable effects
Optimum design
It is the design of any complex mechanical system like a motor car
System design
It is the design of any element of the mechanical system
Element design
This type of design depends upon the use of computer systems to assist in the creation, modification, analysis, and optimization of a design
Computer aided design
It is the beginning of the design process
Identification of need
A step in machine design process which is more specific and must include all the specifications for the object that has to be designed
Definition of the problem
Enumerate Machine Design Process
Identification of Need
Definition of Problem
Synthesis
Analysis and optimization
Iteration
Evaluation
Presentation
General Procedure in Machine Design
Recognition of need
Synthesis (Mechanisms)
Analysis of forces
Material Selection
Design of Elements (size and stresses)
Modification
Detailed drawing
Production
Enumerate the design considerations
1 Functionality
2 Strength/stress
3 Distortion/deflection/stiffness
4 Wear
5 Corrosion
6 Safety
7 Reliability
8 Manufacturability
9 Utility
10 Cost
11 Friction
12 Weight
13 Life
14 Noise
15 Styling
16 Shape
17 Size
18 Control
19 Thermal properties
20 Surface
21 Lubrication
22 Marketability
23 Maintenance
24 Volume
25 Liability
26 Remanufacturing/resource recovery
According to Khurmi and Gupta, what are the general considerations in machine design?
- Type of load and stresses caused by the load
- Motion of the parts or kinematics of the machine
- Selection of materials
- Forms and size of the parts
- Frictional resistance and lubrication
- Convenient and economical features
7.Use of standard parts - Safety of operation
- Workshop facilities
- Number of machines to be manufactured
- Cost of construction
- Assembling
