Pages

Interest in Mechanical Engineering

Interest in Mechanical Engineering
Mechanical Product
1 - Biomedical and Engineering Fluid Mechanics
2 - Combustion and the Environment
3 - Ground Vehicle Systems
4 - Heat Transfer,Thermodynamics,and Energy System
          Manufacturing
5 - Mechanical Design, System Dynamics and Control
6 - Transportation Systems

Biomedical and Engineering Fluid Mechanics:
                                This field of study is based on the fundamentals of fluid mechanics and their broad range of applications in the biomedical and engineering arenas. Areas of current research include blood circulation in the body and its potential role in the regulation of normal physiological function and in the development of disease; groundwater and atmospheric flows and their implications for pollutant transport and environmental concerns; aerodynamic flow around transportation vehicles and its impact on vehicle performance; and flow in combustion engines and other energy systems with considerations of efficiency and environmental impact. These areas are investigated both experimentally and computationally.
https://www.youtube.com/watch?v=uP3Ec04RgMo 
                                { Fluid Mechanics}
Combustion and the Environment:
                                                                 Combustion is widely used for energy generation, propulsion, heating, and waste disposal, as well as for many other applications. Mechanical engineers are often heavily involved with the design of combustion systems (internal combustion engines, gas turbines, furnaces, etc.) and deal with aspects of combustion ranging from increasing efficiency  to reducing pollutant emissions. This area of interest is designed for those who would like to work in fields that use combustion, or that deal with pollution related to combustion. With the current increased emphasis on reducing pollutants while efficiency is maintained or increased, the efforts of mechanical engineers in designing and improving combustion systems are becoming more important.
The program of study focuses on basic aspects of combustion, such as the properties of flames and fuels and pollution; applications of combustion to practical systems like engines and burners; design and optimization of systems that use combustion; and environmental considerations like pollution generation, control, transport, and effect.

Ground Vehicle Systems:
                                                         An aspect of mechanical engineering is the design of surface vehicles. The emphasis in on the design of more environmentally benign vehicles that can provide transportation while using fewer resources. Innovations in this field require competence in vehicle dynamics, propulsion and engine concepts, control of power transmission, and construction of lightweight manufacturing  structures and systems. Alternatively fueled power systems, including electric drives, are also studied.
Heat Transfer, Thermodynamics, and Energy Systems:
                                             This area of interest emphasizes the fundamentals of heat transfer and thermodynamics and their application to the design of advanced engineering systems. The objective of this program of study is to introduce the fundamental processes of heat transfer and thermodynamics in complex engineering systems to enable more efficient, cost effective, and reliable designs with less environmental pollution and impact. An understanding of heat transfer and thermodynamics is required for the design of efficient, cost-effective systems for power generation (including advanced energy conversion systems), propulsion (including combustion engines and gas turbines), heat exchangers, industrial processes, refining, and chemical processing. This area of interest is important to many industries-aerospace, defense, automotive, metals, glass, paper, and plastic-as well as to the thermal design of electronic and computer packages.
Manufacturing:
                                     Manufacturing is the process of converting raw materials into products. A major activity of mechanical engineers is studying and working with various production methods and techniques, integrating creative design activities into actual fabricated products. The emphasis in the manufacturing program is to provide hands-on experience with state-of-the-art and computer-integrated processes and manufacturing methods. Laboratories have state-of-the-art manufacturing equipment for conventional and non-traditional machining, three-dimensional measurement, and plastic injection molding. Computer-oriented manufacturing is also an emphasis of the program. A manufacturing engineer will have a solid background in manufacturing processes and systems as well as in statistics, design, controls, and applications of microprocessors.
Mechanical Design:                                                                                                                   
                                            The creation and improvement of products, processes, or systems that are mechanical in nature are the primary activities of a professional mechanical engineer. The development of a product, from concept generation to detailed design, manufacturing process selection and planning, quality control and assurance, and life-cycle considerations are areas of study and specialization in the area of mechanical design. Solutions to such major social problems as environmental pollution, lack of mass transportation and of raw materials, and energy shortages will depend heavily on the engineer’s ability to create new types of machinery and mechanical systems. The engineer-designer must have a solid and relatively broad background in the basic physical and engineering sciences and have the ability to solve a variety of problems. In addition to having technical competence, the designer must be able to consider the social -economic consequences of a design and its possible impact on the environment. Product safety, reliability and economics are other considerations.
System Dynamics and Control:
                                                      Engineers are increasingly concerned with the performance of integrated dynamics systems in which it is not possible to optimize component parts without considering the overall system. System dynamics and control specialists are concerned with the modeling, analysis, and simulation of all types of dynamic systems and with the use of automatic control techniques to change the dynamic characteristics of systems in useful ways. The emphasis in this program is on the physical systems that are closely related to mechanical engineering, but the techniques for studying these systems apply to social, economic, and other dynamic systems.
Transportation Systems:

                                                   An important aspect of mechanical engineering is the planning, design, and operation of transportation systems. As society recognizes the increasing importance of optimizing transportation systems to minimize environmental degradation and energy expenditure, engineers will need to consider major innovations in the way people and goods are moved. Such innovations will require competence in vehicle dynamics, propulsion and control, and an understanding of the problems caused by present-day modes of transportation.

Basic Terms of Mechanical Engineering


List of Basic Terms for Mechanical Engineering :


1. Torque or Turning Force
2. Couple
3. Moment
4. Stress
5. Strain
6. Spring
7. Specific Weight
8. Specific Volume
9. Specific Gravity
10. Specific Heat
11. Viscosity
12. Buoyancy
13. Device for Fluid
14. Draft Tube
15. Thermodynamics Law-
         zeroth law
         First law
         second law
16. Boiler/Steam Generator
17. Super heater
18. Air Pre heater
19. Nozzle
20. Scavenging
21. Supercharging
22. Turbocharging
23. Governor
24. Flywheel
25. Heat Transfer
26. Thermal Conductivity
28. Heat Exchanger
29. Refrigeration
30. 1 tonne Refrigeration
31. Humidification
32. Gear Train
33. Heat Treatment
34. Allowance
35. Tolerance
36. Clearance
37. Stiffness
38. Toughness
39. Fatigue
40. Nuclear Fission
41. Nuclear Fusion
42. Welding
43. Cutting Tool 
45. Indexing
44. Jig
45. Fixture

Details 

Torque or Turning Force:
It is the total amount of force which is required to create acceleration on moving substance.

Couple:
Two forces those acts on equally,p & oppositely on two separate points of same material.

Moment:
It is the amount of moving effect which is gained for action of turning force.

Stress:
It is the force that can prevent equal & opposite force. That means, it is the preventing force. If one force acts on outside of a material, then a reactive force automatically acts to protest that force. The amount of reactive force per unit area is called stress. e.g. Tensile Stress, Compression Stress, Thermal Stress.

Strain:
If a force acts on a substance, then in that case if the substance would deform. Then the amount of deformation per unit length of that substance is called strain.

Spring:
It is one type of device which is being distorted under certain amount of load & also can also go to its original face after the removal of that load.
Its function:
To store energy.
To absorb energy.
To control motion of two elements.

Stiffness:

Load per unit deflection. The amount of load required to resist the deflection.

Specific Weight:

Weight per unit volume of the fluid.

Specific Volume:

Volume per unit mass of the fluid.

Specific Gravity:

It is the ratio of specific weight of required substance to specific weight of pure water at 4 degree centigrade temperature.

Specific heat:

The amount of heat required to increase 1 unit temperature of 1 unit mass.

Viscos
ity:
Dynamic Viscosity:
The amount of resistance of one layer of fluid over other layer of fluid.

Kinematic Viscosity:
It is the ratio of dynamic viscosity to density.

Buoyancy:
When a body is immersed in a liquid, it is lifted up by a force equal to weight of liquid displaced by the body. The tendency of liquid to lift up an immersed body is buoyancy. The upward thrust of liquid to lift up the body is called buoyancy force.
Devices for fluid:
Hydraulic Machine:
Turbine,Pump,Compressor etc.

Draft tube:
It attaches with reaction turbine . Its function is to reduce energy loss from reaction turbine & it also reduce pressure at outlet which is must blow the atmospheric pressure.

Thermodynamics Law:


Zeroth Law:
If two body are in thermal equilibrium with a third body then these two body are also in thermal equilibrium with each other.

First Law of Thermodynamics:
In a closed system, work deliver to the surrounding is directly proportional to the heat taken from the surrounding.And also, In a closed system, work done on a system is directly proportional to the heat deliver to the surrounding.

Second Law of Thermodynamics:

It is impossible to make a system or an engine which can change 100 percent input energy to 100 percent output.

Calorific Value of fuel:
It us the total amount of heat obtained from burning 1 kg solid or liquid fuel.

Boiler/Steam Generator:
It is a closed vessel which is made of steel. Its function is to transfer heat to water to generate steam.

Super heater:
It is a part of boiler. Its function is to increase temperature of steam into boiler.

Air-Pre heater:
It is a part of boiler. Its function is to preheats the air to be supplied to furnace and it recover heat from exhaust gas.

Boiler 
It is an important term for boiler. It is the difference of pressure above and below the fire grate. This pressure difference have to maintain very carefully inside the boiler. It actually maintained the rate of steam generation. This depends on rate of fuel burning. Inside the boiler rate of fuel burning is maintained with rate of entry fresh air. If proper amount of fresh air never entered into the boiler, then proper amount of fuel inside the boiler never be burnt. So, proper fresh air enters into the boiler only by maintaining boiler 
Nozzle:
Nozzle is a duct of varying cross-sectional area. Actually, it is a passage of varying cross-sectional area. It converts steam's heat energy into mechanical energy. It is one type of pipe or tube that carrying liquid or gas.

Scavenging:

It is the process of removing burnt gas from combustion chamber of engine cylinder.

Supercharging:
Actually, power output of engine depends on what amount of air enter into the engine through intake manifold. Amount of entry aiy if increased, then must be engine speed will increased. Amount of air will be increased by increasing inlet air density. The process of increasing inlet air density is supercharging. The device which is used for supercharging is called supercharger.Supercharger driven by a belt from engine crankshaft. It is installed in intake system.

Turbocharging:
Turbocharging is similar to the supercharging. But in that case turbocharger is installed in exhaust system whereas supercharger is installed in intake system. Turbocharger is driven by force of exhaust gas. Generally, turbocharger is used for 2-stroke engine by utilizing exhaust energy of the engine, it recovers energy otherwise which would go waste.

Governor:
Its function id to regulate mean speed of engine when there are variation in the load. If load increases on the engine, then engine's speed must decrease. In that case supply of working fluid have to increase. In the other way, if load decrease on the engine, then engine' speed must increase. In that case supply of working fluid have to decrease.Governor automatically, controls the supply of working fluid to the engine with varying load condition.

Flywheel:
It is the one of the main parts of the I.C. engine. Its main function id to store energy in the time of working stroke or expansion stroke. And, it releases energy to the crankshaft in the time of suction stroke, compression stroke & exhaust stroke. Because, engine has only one power producing stroke.

Heat Transfer:
It is a science which deals with energy transfer between material bodies as a result of temperature difference.There are three way to heat transfer such as-Conduction Convection Radiation

Heat Exchanger:
It is one type of device which can transfer heat from one fluid to another fluid.
 Example : Radiator, inter cooler, pre heater, condenser, boiler etc.

Refrigeration
 It is the process of removing heat from a substance. Actually, extraction of heat from a body whose temperature is already below the temperature of its surroundings.
Humidification:
It is the addition of moisture to the air without change dry bulb temperature.

Gear Train:
Meshing of two or more gear. It can transmit power from one shaft to another shaft.

Heat Treatment:
Operation involving heating and cooling of a metal in solid state for obtaining desirable condition without being changed chemical composition.Its object-increase hardness of metal.increase quality of metal ( heat, corrosion,wear resistance quality )improve machine

Allowance:
It is the difference between basic dimension of mating parts. That means, minimum clearance between mating parts that can be allowed.

Tolerance:
It is the difference between upper limit of dimension. It is also the permissible variation above and below the basic size. That means maximum permissible variation in dimensions.

Clearance:
It is the difference in size between mating parts. That means, in that case the outside dimension of the shaft is less than internal dimension of the hole.

Stiffness:
It is the ability to resist deformation.

Toughness:

It is the property to resist fracture.

Fatigue:
When a material is subjected to repeated stress below yield point stress, such type of failure is fatigue failure.

Nuclear Fission:
It is a nuclear reaction by which one big nuclear divided into two or more nuclear
Nuclear Fussion:
It is also a nuclear reaction by which one big nuclear will produced by adding two small nuclear.

Welding:
It is the process of joining two similar or dissimilar metal by fusion.

Arc Welding -
* need D.C current
* produced (6000-7000) Degree Centigrade Temperature
Gas Welding -
* Oxygen - acetylene flame join metals
* Oxygen & acetylene gas works
* produced 3200 Degree Centigrade Temperature

Cutting Tool:

Tool Materials for Cutting Tool:
1. High Carbon Steel
2. High Speed Steel (W+Cr+V)
3. Carbide (W Carbide+Ti Carbide+Co Carbide)

Indexing:


It is the method of dividing periphery of job into equal number of division. Actually, it is the process of dividing circular or other shape of work piece into equal space, division or angle.

Jig:
It is one type of device which hold & locate work piece and also guide & control cutting tool. It uses in drilling, reaming and tapping.

Fixture:
It is one type of device which hold and locate work piece. It uses in milling, grinding, planning & turning.

Thermodynamics And Thermo Science

Thermodynamics And Thermo-Science :
Critical Point of Thermdynamic
                                                                 Thermodynamics is an applied science used in several  branches of engineering including mechanical and chemical engineering . At its simplest thermodynamics is the study of energy its use and transformation through a system . Typically engineering  thermodynamics is concerned with changing energy from one from one from to another.

AS an example , automotive engines convert chemical energy enthalpy from the fuel into heat and then into mechanical work that eventually turns the wheel .

Thermodynamics principles are used by mechanical engineers the fields of heat transfer , thermofluids and energy conversion . Mechanical engineers use thermo science to design engines and power plants heating ventilation and air condition HAVC systems heat exchangers heat sinks radiators refrigeration insulation and others.        

  
Technical Drawing And CNC:                                                                                 Drafting or technical drawings is the means by which mechanical engineers design products and create instructions  manufacturing parts . A technical drawing can be a computer model or hand-draw  schematic showing all the dimensions necessary to manufacture a part as well as assembly notes a list of required materials , and other pertinent information . Mechanical engineer or skilled worker who create technical two-dimensional process but computer added design  CAD  programs now allow the designer to create in three dimensions.
CNC lathe 3 axes simultaneously
Technical Drawing
                                                                   Instructions for manufacturing a part must be fed to the necessary machinery either manually through programmed instructions or through the use of the computer added manufacturing  CAM or combined CAD/CAM program. Optionally an engineer may also manually manufacturing a part using the technical drawings. Engineers  manually manufacture parts in the areas of applied spray coatings finishes and other processes that cannot economically or practically be done by a machine.
precision machining of cylinder heads
                                                                                                               Drafting is used in nearly every sub discipline of mechanical engineering , and by many other branches of engineering and architecture . Three dimensional models created using  CAD software are also commonly used in finite element analysis and computational fluid dynamics .

Structural analysis and Failure analysis:

Failure Analysics
                                                                                   Structural analysis is the branch of mechanical engineering and also civil engineering devoted to examining why and how objects fail and to fix the objects and their performance. Structural failures occur in two general modes: static failure, and fatigue failure. 
Structural Analysics
Static structural failure occurs when, upon being loaded having a force applied the object being analyzed either breaks or is deformed plastically, depending on the criterion for failure. Fatigue failure occurs when an object fails after a number of repeated loading and unloading cycles. Fatigue failure occurs because of imperfections in the object: a microscopic crack on the surface of the object, for instance, will grow slightly with each cycle until the crack is large enough to cause ultimate failure.
Failure is not simply defined as when a part breaks, however; it is defined as when a part does not operate as intended. Some systems, such as the perforated top sections of some plastic bags, are designed to break. If these systems do not break, failure analysis might be employed to determine the cause.
Structural analysis is often used by mechanical engineers after a failure has occurred, or when designing to prevent failure.
Structural analysis may be used in the office when designing parts, in the field to analyze failed parts, or in laboratories where parts might undergo controlled failure tests

Introduction Mechanical Engineering

Introduction of Mechanical Engineering:

Railway Track use the Mechanical And Electrical Engineering

                                                            Mechanical engineering is the discipline that applies the principal of engineering , physic and material of the science for the design manufacturing and maintenance of mechanical engineering . It is the branch of of engineering that involves the design production operation  of the machinery .
The mechanical engineering field requires an understanding of core areas including mechanics thermodynamics , material science  structural analysis and electricity. Mechanical  engineers use the core principles along with tools like computer added design and product cycle  management to design and analyze manufacturing plants , Industrial equipment and machinery, heating and cooling  systems  transport system aircraft, watercraft, weapon and many others .

Mechanical engineering emerged as a field  during the industrial Revolution in Europe the 18th century , however, its development can be traced back several thousand years around the world of physics. The field has continually evolved to incorporate advancements in the technology , and mechanical engineers today are pursuing developments in such field as composites, mechatronics . Mechanical engineering overlaps with aerospace engineering , metallurgical engineering, industrial engineering ,civil engineering , electrical engineering , manufacturing engineering , chemical engineering and other engineering disiplines to varying amounts.