3. A rocker mechanism is as shown in Figure Q3. The data pertaining to the mechanism...

Transcribed Image Text:

3. A rocker mechanism is as shown in Figure Q3. The data pertaining to the mechanism is as follows: AB = CD = BG = 30 mm 60 mm 50 mm BC = NAB = TCD = giving details of any assumptions made. 180 mm 250 rpm CW as shown 10 Nm on CW motion only a) For the position shown: i) Determine the position vector equation, ii) Define the radial and tangential unit vectors and link lengths, iii) Determine the velocity vector equation, iv) Determine the acceleration vector equation, [2 marks] [2 marks] [3 marks] [3 marks] b) For the system at the position and speed given, construct the velocity diagram stating the absolute linear velocity of the point G. You may use the attached Question 3 Solution Sheet 1 as part of your answer, [5 marks] c) For the system at the position and speed given, construct the acceleration diagram stating the absolute angular acceleration of the link BC and linear acceleration of the point G. You may use the attached Question 3 Solution Sheet 2 as part of your answer, [5 marks] d) Finally, briefly describe how an MSC Adams computer model could be constructed for the mechanism, commenting on the data associated with the component solids, joints, motion driver and load input used. Use a diagram to illustrate your answer. [5 marks] 10 mm D C TCD 82.1 19.2 150 mm Figure Q3 Rocker Mechanism G A NAB B 20 3. A rocker mechanism is as shown in Figure Q3. The data pertaining to the mechanism is as follows: AB = CD = BG = 30 mm 60 mm 50 mm BC = NAB = TCD = giving details of any assumptions made. 180 mm 250 rpm CW as shown 10 Nm on CW motion only a) For the position shown: i) Determine the position vector equation, ii) Define the radial and tangential unit vectors and link lengths, iii) Determine the velocity vector equation, iv) Determine the acceleration vector equation, [2 marks] [2 marks] [3 marks] [3 marks] b) For the system at the position and speed given, construct the velocity diagram stating the absolute linear velocity of the point G. You may use the attached Question 3 Solution Sheet 1 as part of your answer, [5 marks] c) For the system at the position and speed given, construct the acceleration diagram stating the absolute angular acceleration of the link BC and linear acceleration of the point G. You may use the attached Question 3 Solution Sheet 2 as part of your answer, [5 marks] d) Finally, briefly describe how an MSC Adams computer model could be constructed for the mechanism, commenting on the data associated with the component solids, joints, motion driver and load input used. Use a diagram to illustrate your answer. [5 marks] 10 mm D C TCD 82.1 19.2 150 mm Figure Q3 Rocker Mechanism G A NAB B 20