Reference no: EM13703846
For an assembly line, you need to design a linkage that moves a point P in approximately a straight line over a distance of 24” in one second. It is also specified that P must return from the endpoint back to the starting point in five seconds, giving a total cycle time of six seconds. The 24” section must be as straight as possible and the speed of P may not vary more than 5% during this part of the cycle when the crank is driven at a constant speed.
Read the section “Designing Optimum Straight-Line Fourbar Linkages” design a Hoeken-type linkage for these performance specifications.
1. Provide the link lengths (L1, L2, L3, L4) in inches and show clearly how you determined these.
2. What is the average velocity of P over the 24” path, in inches per second?
3. What is the maximum deviation in velocity ( v), in inches per second, over ? the 24” section of the path?
4. What is the maximum deviation (in inches) of P from the straight line?
5. What must be the speed of the motor that drives the crank, in RPM (revolutions per minute)?
6. Draw the linkage to scale, preferably in the position where P is at the beginning of the 24” section. Indicate dimensions of the linkage in your drawing. If you are not sure how to draw the assembled linkage,. If you wish to use a CAD package to assemble and draw your mechanism, that is fine too.
|
Magnitude of the cars acceleration during the turn
: The car travels at a constant speed of 25 m/s makes a turn on a semi-circular curve. If it takes 20s to make the semi-circular turn, determine the magnitude of the car’s acceleration during the turn.
|
|
Pilot in an airplane flying horizontally with constant speed
: A pilot in an airplane flying horizontally with constant speed of v = 480 km/hour at an elevation of h=610 m above a level plain wishes to bomb a target B on the ground as shown below. At what angle below the horizontal should he see the target at th..
|
|
Brass rod is stress-free at room temperature
: A brass rod is stress-free at room temperature (20 degrees Celsius). It is then heated up but prevented from lengthening at its ends by external forces. At what temperature does the stress in the rod reach 172 MPa? Assume the modulus of elasticity is..
|
|
Contains nitrogen gas with an absolute pressure
: A rigid tank contains nitrogen gas with an absolute pressure of 113.1 kPa. A vacuum pressure gage connected to the tank reads -14.2 kPa-vacuum. What is the local atmospheric pressure (in kPa)?
|
|
Designing optimum straight-line fourbar linkages
: For an assembly line, you need to design a linkage that moves a point P in approximately a straight line over a distance of 24” in one second. It is also specified that P must return from the endpoint back to the starting point in five seconds, givin..
|
|
Air flows in adiabatic duct without friction
: Air flows in adiabatic duct without friction. At one section the Mach number is 1.5, and further downstream it has increased to 2.8. Find the area ratio.
|
|
Determine the final temperature-pressure and specific volume
: For the two processes given below, determine the final temperature, pressure, specific volume, and the changes in internal energy, enthalpy, and entropy. Calculate the final temperature and change in specific internal energy as steel at 212 kPa and 5..
|
|
A pitot-static tube is placed in a subsonic air flow
: A pitot-Static tube is placed in a subsonic air flow. The static pressure and temperature in the flow are 80 kPa and 12 oC respectively. The difference between the pitot and static pressures are measured using a manometer and found to be 200 mm of me..
|
|
Does the radius of the column matter
: Concrete has a density of 2500 kg/m3 and a compressive strength of 30 MPa. What is the maximum height of a column of concrete that can support its own weight? Does the radius of the column matter?
|