This is an outline of the section heading and requirements for the group (three people) mechanical design assignment. Submit both a hard copy of your assignment report before 5.00pm Friday 5th May 2017.
You choose a simple power transmission machine, i.e. it rotates a moving part in order to achieve some function. This will have speed, torque, dimensions, mass, acceleration, etc. The power must be transmitted by a shaft through a clutch or a belt drive back to a motor with or without a combined gearbox as required by your application.
The application is the mechanical design of a mechanism to hoist a patient from a hospital bed to a hospital trolley.
What is the specific function of the machine, what does it do, when and where is it used and by whom, how does it operate, what are its constraints.
The design must lift a person from a bed to a trolley, it be stable, easily movable by one person. It will use a sling attached to a cable. The cable will be wound onto a drum at a safe speed. The hoist must be electrically operated and include a safe way of preventing it moving while being used. The hoist will have a base that can slide under the bed.
These are the specific values of the upper or lower limits, or the ranges, applicable to the characteristics, that were determined by your application. These must be measurable.
The design must lift a person weighing 130 kg with a footprint of up to 2 metres by metres, a height of 300 mm above a hospital bed. The base of the hoist must not be higher above the ground then the underside of a bed at its lowest position. The hoist must have lockable wheels suitable for a hospital environment. The attached sling must be 2 metres long 180 mm wide and have a factor of safety of 5. The cable must be steel and have a bending radius of 60 mm. The hoist drum must not accelerate the load by more than 0.5 m/s2 and have a maximum velocity of 0.2 m/s. Etc.
These are the variables that are used in the mechanics equations. They have units and have come from the specifications, and the design decisions you make. Some like those set by the specifications are inputs to or required outputs from the equations you use. Some variable are determined by your material selection or your initial assumptions behind your outline design / sketch of your application.
They include mass, length, breadth, width, force, extension, direct stress, shear stress, bending stress, strain, moment, second moment of area, polar second moment of area, modulus of elasticity, modulus of rigidity, shear, modulus, torque, radius of gyration, acceleration, velocity, coefficient of friction, angle, angle of lap, power, etc.
These are the mechanics equations as used in class. This assignment is a vehicle for you to apply the mechanics learnt on the module to a mechanical design problem of your choosing. From your design sketch identify and/or include one good example of the application of each of the mechanics equations listed and apply the necessary formulas to calculate values that will meet your specifications. You may have more than one unknown in your equations; this will require you to temporarily assume some variables for the first iteration of your calculations.
Include in your design:
A parallel compound bar incorporating two bonded components of different dimensions and material.
A beam, either a cantilever or one assumed to be simply supported.
A component loaded with a direct tensile or compressive force.
A component undergoing torsion.
An eccentrically loaded component
A rotating inertial mass
A friction clutch, or a belt drive
A screw-thread mechanism, mechanically or manually operated.
A power transmission shaft.
These are the final calculated results from your equations. They are the mechanical design variables that meet your specifications. The list below is only a general sample and will not include all of your solutions.
They will include values such as:
The second moment of area of a component
The shearing force and bending moment diagram for a component
The maximum direct, bending, and torsion stresses in your designed components.
The torque, speed and power of your motor.
The dimensions and material solutions calculated for your designed components
Any other design solutions that you have calculated.
Verify that your solutions meet your initial design specifications
Your completed assignment must include a technical sketch, this is not, you’ll be glad know, a full engineering drawing but more akin to a free body diagram. The amount of detail in the sketch must be sufficient to communicate the results of your calculations and their implications for the design. The sketch should also give an outline representation of the mechanism and a context for the designed elements. You can use CAD, but a neat freehand sketch will suffice.
The structure and headings for your submitted report is as outlined in the class and as described in this document. The coversheet must include the name of each member of the group along with an indication of their individual contribution to the assignment.
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