Mechanical Engineering Systems

Mechanical Engineering Systems

 Bill Bolton, Peter Edwards, Richard Gentle

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The engineering design process, which is what most engineering is all about, can be very convoluted. While it relies heavily on calculation, there is often a need to make educated guesses to start the
calculations. To crack problems like the one above of the new mower you will need to combine technical knowledge with practical experience, a flair for creativity and the confidence to make those educated guesses. The engineering courses that this textbook supports must, therefore, be seen as only the start of a much longer-term learning process that will continue throughout your professional career. A good engineer needs to think of all the subjects that are studied on an undergraduate course in modular chunks as being part of a single body of technical knowledge that will form the foundation on which a career can be built. At the introductory level of this book, it is best
to keep the distinction between the various topics otherwise it can become confusing to the student; it is difficult enough coming to terms with some of the concepts and equations in each topic without
trying to master them all at the same time. The lawnmower example, however, shows that you must be able to understand and integrate all the topics, even though you may not have to become an
expert in all of them if you want to be a proficient engineer.

At last you are starting to get somewhere because the first point will allow you to calculate the size of fan that is required and the power that is needed to drive it. The second point will allow you to calculate the rate at which waste heat from the engine must be supplied to the wet grass. Knowing the waste power and the typical efficiency of this type of engine you can then calculate the overall power that is needed if the engine is to meet this specification to dry the grass cuttings as they are produced.
Once you have the overall power of the engine and the portion of that power that it will take to drive the fan you can calculate the power that is available for the mowing process and for driving the mower’s wheels.These two facts will allow you to use your knowledge of dynamics to
estimate the performance of the mower as a vehicle: the acceleration with and without the blades cutting, the maximum speed up an incline and the maximum driving speed.

Mechanical Engineering Systems

Content :
  • Introduction: the basis of engineering
  • Thermodynamics
  • Fluid mechanics
  • Dynamics
  • Statics
  • Solutions to problems

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