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1 Name _Greg Brulo Scissor Jack The scissor jack is a popular jack found in a vehicles flat tire kit. The operator cranks the input rod to raise and lower the vehicle. This analysis is done in 2D and removes the pivoting part at the top of the jack.
2 Name _Greg Brulo Skeletal Diagram of Scissor Jack
3 Name _Greg Brulo Mobility Calculation nl 8 nj 9 nj2 2 nj3 M 2D mobility M=3(nL-)-2(nJ)-nJ2 M=3(8-)-2(9)-2 M=2-8-2 M = Topology of Scissor Jack
4 Name Arjun Singh Chauhan ) Download 2) Obtain a digital image of a mechanism, and paste it into this Word document. You may take a digital photo, scan a hardcopy photograph or drawing, or obtain an on-line image. 3) Provide a name and brief description of the purpose for your mechanism. Mini-drafter: Used in engineering drawings to draw parallel, perpendicular or inclined lines accurately and quickly. (See answer to 4) AB=DC and AD=BC, so DC stays parallel to AB. Similarly, HG stays parallel to EF. So HG is always perpendicular to AB. The joint I is fixed before use to keep link 8 in a fixed orientation as it translates.
5 Name Arjun Singh Chauhan 4) Use the MS-Word drawing toolbar or other drawing tools to draw a skeletal diagram for your mechanism. Insert that drawing into this Word file. Clearly label the links and joints. Number the links using for the ground link, and letter the joints. 5) Identify the number of links (nl), DOF joints (nj), 2 DOF joints (nj2), 3 DOF joints (nj3) and mobility (M). nl 8 nj 9 nj2 0 nj3 0 M 3
6 ME 58 H0 6) Diagram the topology of your mechanism. 7) Submit PDF copy. Name Arjun Singh Chauhan
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9 Name Hilmi Entabi ) Download 2) Obtain a digital image of a mechanism, and paste it into this Word document. You may take a digital photo, scan a hardcopy photograph or drawing, or obtain an on-line image. 3) Provide a name and brief description of the purpose for your mechanism. This is drag link steering system. This mechanism transmits the rotation of a car s steering wheel to rotate the steering knuckles and turn the car. For this excersize we will assume that the kinematic chain operates on the same plane and that the axle is rigidly connected to the vehicle frame. 4) Use the MS-Word drawing toolbar or other drawing tools to draw a skeletal diagram for your mechanism. Insert that drawing into this Word file. Clearly label the links and joints. Number the links using for the ground link, and letter the joints.
10 Name Hilmi Entabi 5) Identify the number of links (nl), DOF joints (nj), 2 DOF joints (nj2), 3 DOF joints (nj3) and mobility (M). nl 8 nj 0 nj2 0 nj3 0 M 6) Diagram the topology of your mechanism. 7) Submit PDF copy P A B C D E F G H I J A B C D E F G H I J
11 Name Lauren Hickox ) Download 2) Obtain a digital image of a mechanism, and paste it into this Word document. You may take a digital photo, scan a hardcopy photograph or drawing, or obtain an on-line image. 3) Provide a name and brief description of the purpose for your mechanism. polycentric knee prosthesis This is a mechanical knee joint that connects below and above knee prosthetic components and allows the shank (below knee) component to rotate with respect to the thigh (above knee). A polycentric knee prosthesis has a center of rotation that changes with the kneeflexion angle and better emulates the motion of a normal knee joint during gait (in comparison to a single-axis prosthesis). 4) Use the MS-Word drawing toolbar or other drawing tools to draw a skeletal diagram for your mechanism. Insert that drawing into this Word file. Clearly label the links and joints. Number the links using for the ground link, and letter the joints. Links Joints A Link that attaches to proximal segment (thigh) is ground A 4 B 2 D 3 C
12 Name Lauren Hickox 5) Identify the number of links (nl), DOF joints (nj), 2 DOF joints (nj2), 3 DOF joints (nj3) and mobility (M). nl 4 nj 4 nj2 0 nj3 0 M 2D mobility M = 3 (4-) 2 (4) = 9 8 = 6) Diagram the topology of your mechanism. Skeletal Diagram Topology 7) Submit PDF copy.
13 Name Maryam Jahanzad ) Download 2) Obtain a digital image of a mechanism, and paste it into this Word document. You may take a digital photo, scan a hardcopy photograph or drawing, or obtain an on-line image. Note: I have the same pooper scooper at home but since that one was very dirty I decided to use the images in amazon.com. 3) Provide a name and brief description of the purpose for your mechanism. - Pooper Scooper for dog. This device is used for disposing pet waste. It eliminates a close contact of human with pet waste. And it is introduced as a pooper scooper in the market. 4) Use the MS-Word drawing toolbar or other drawing tools to draw a skeletal diagram for your mechanism. Insert that drawing into this Word file. Clearly label the links and joints. Number the links using for the ground link, and letter the joints.
14 Name Maryam Jahanzad 3 B 2 Note: we have spring in this system. But spring can be ignored. In the next part of the home work I will consider 2 cases; one without spring and one with spring. Explanation is given below. A C 4 5) Identify the number of links (nl), DOF joints (nj), 2 DOF joints (nj2), 3 DOF joints (nj3) and mobility (M). First scenario: This scenario is more realistic and it is preferred over the second scenario. Note : Here we are ignoring the spring. It is assumed that spring doesn t make any changes to the degree of freedom of the whole mechanism. In fact, function of the spring is just to restore the original position for link 3 & 4 and make them align. By, removing the spring, original position can be still restored but manually and with applying force. nl 4 nj 4 nj2 0 nj3 0 M 6) Diagram the topology of your mechanism. 2 B 2 C 3 B 3 4 A C 4 A,A3 A, A4
15 Name Maryam Jahanzad Second scenario : This scenario is added here only to explain what happened to the spring in this kind of mechanisms. Note : Here we consider that spring exist in the geometry and works as a prismatic joint between links & 2. Spring reduces the degree of the freedom of the whole geometry. In fact by considering the spring in the mechanism we are adding 2 constraints in the mechanism. These 2 constraints are enforced on link 3 & 4. To understand the root of these constraints, we can consider the cases where spring is too stiff and the opposite case where the spring is too loose (small spring constant). nl 4 nj 5 nj2 0 nj3 0 M - Here spring is represented as a prismatic joint between link & 2. In other words, link 2 can slide in link. P D 2 3 B A 4 C D A,A3 A, A B C
16 Name: Justin A. Jones ) Download 2) Obtain a digital image of a mechanism, and paste it into this Word document. You may take a digital photo, scan a hardcopy photograph or drawing, or obtain an on-line image. 3) Provide a name and brief description of the purpose for your mechanism. Box Transporter conveyor using a crank mechanism 4) Use the MS-Word drawing toolbar or other drawing tools to draw a skeletal diagram for your mechanism. Insert that drawing into this Word file. Clearly label the links and joints. Number the links using for the ground link, and letter the joints. 5) Identify the number of links (nl), DOF joints (nj), 2 DOF joints (nj2), 3 DOF joints (nj3) and mobility (M). nl 8 nj 0 nj2 0 nj3 0 M 6) Diagram the topology of your mechanism. 7) Submit PDF copy.
17 Name: Justin A. Jones I J 7 8 D C A 2 5 G H 3 B 6 E 4 F
18 Name: Justin A. Jones F G 6 H B C E D A I J
19 Name _SOUMYABATA MAITI_ ) Download 2) Obtain a digital image of a mechanism, and paste it into this Word document. You may take a digital photo, scan a hardcopy photograph or drawing, or obtain an on-line image. Figure. Adjustable 6 bar Stephenson III mechanism. (DOI: 0.06/j.mechmachtheory ) 3) Provide a name and brief description of the purpose for your mechanism. The mechanism shown in Fig. is known as Stephenson III mechanism. It is mostly used as dwell mechanism, for example in hand pump. 4) Use the MS-Word drawing toolbar or other drawing tools to draw a skeletal diagram for your mechanism. Insert that drawing into this Word file. Clearly label the links and joints. Number the links using for the ground link, and letter the joints.
20 Name _SOUMYABATA MAITI_ Figure 2. 5) Identify the number of links (nl), DOF joints (nj), 2 DOF joints (nj2), 3 DOF joints (nj3) and mobility (M). nl 6 nj 7 nj2 0 nj3 0 M 3x(6- )-2x7 = 6) Diagram the topology of your mechanism.
21 Name _SOUMYABATA MAITI_ 7) Submit PDF copy.
22 Name Hugo McMenamin ) Download 2) Obtain a digital image of a mechanism, and paste it into this Word document. You may take a digital photo, scan a hardcopy photograph or drawing, or obtain an on-line image. Source: 3) Provide a name and brief description of the purpose for your mechanism. This mechanism is an windscreen wiper linkage used to move the windscreen wipers on a vehicle. The windscreen wipers press against the glass of the vehicle and wipe away the water and other materials on the windscreen. 4) Use the MS-Word drawing toolbar or other drawing tools to draw a skeletal diagram for your mechanism. Insert that drawing into this Word file. Clearly label the links and joints. Number the links using for the ground link, and letter the joints.
23 Name Hugo McMenamin 5) Identify the number of links (nl), DOF joints (nj), 2 DOF joints (nj2), 3 DOF joints (nj3) and mobility (M). nl 6 nj 7 nj2 nj3 M MM = 3(nnnn ) 2(nnJJ ) nnjj 2 MM = 3(6 ) 2(7) 0 MM = 5 4 = 6) Diagram the topology of your mechanism. 7) Submit PDF copy.
24 Name Nick Papavizas ) Download 2) Obtain a digital image of a mechanism, and paste it into this Word document. You may take a digital photo, scan a hardcopy photograph or drawing, or obtain an on-line image. Image courtesy of 3) Provide a name and brief description of the purpose for your mechanism. This is a MEMS-based nano-positioning stage for applications such as micromachining, X- ray microscopy, micro-force sensors, and actuators for scanning probe microscopy. The mechanism is a planar parallel manipulator, or PPM, and more specifically classified as a 3- P, which indicates type and order of the joints in each of the mechanism s 3 independently driven manipulator arms (3-Prismatic-evolute-evolute). The underlined letter indicates joint at which the arms are driven. In the example above, the prismatic joints are electrostatic linear comb actuators.
25 Name Nick Papavizas 4) Use the MS-Word drawing toolbar or other drawing tools to draw a skeletal diagram for your mechanism. Insert that drawing into this Word file. Clearly label the links and joints. Number the links using for the ground link, and letter the joints. A B 2 D 5 6 E F 3 4 C G 7 8 I H 5) Identify the number of links (nl), DOF joints (nj), 2 DOF joints (nj2), 3 DOF joints (nj3) and mobility (M). nl 8 nj 9 nj2 0 nj3 0 M 3 M = 3(nL ) 2nJ nj2 M = 3(8 ) 2(9) 0 M = 3
26 Name Nick Papavizas 6) Diagram the topology of your mechanism. C D G B E H P P P A F I
27 Name David Pepley ) Download 2) Obtain a digital image of a mechanism, and paste it into this Word document. You may take a digital photo, scan a hardcopy photograph or drawing, or obtain an on-line image. 3) Provide a name and brief description of the purpose for your mechanism. Scissor lift. Scissor lifts are used to more easily vertically lift heavy objects just as a person. The one above uses a piston mechanism as the power source. This mechanisms involves a piston, sliders, and revolving joints. 4) Use the MS-Word drawing toolbar or other drawing tools to draw a skeletal diagram for your mechanism. Insert that drawing into this Word file. Clearly label the links and joints. Number the links using for the ground link, and letter the joints. 5) Identify the number of links (nl), DOF joints (nj), 2 DOF joints (nj2), 3 DOF joints (nj3) and mobility (M). nl _ 0 _ nj 3 nj2 0 nj3 0 M Calculated using planar mobility equation 6) Diagram the topology of your mechanism.
28 Name David Pepley
29 Name: Jacob osnack ) Download 2) Obtain a digital image of a mechanism, and paste it into this Word document. You may take a digital photo, scan a hardcopy photograph or drawing, or obtain an on-line image. Source: 3) Provide a name and brief description of the purpose for your mechanism. Garlic Press used to extrude peeled garlic through small orifices resulting in minced garlic. 4) Use the MS-Word drawing toolbar or other drawing tools to draw a skeletal diagram for your mechanism. Insert that drawing into this Word file. Clearly label the links and joints. Number the links using for the ground link, and letter the joints.
30 Name: Jacob osnack 5) Identify the number of links (nl), DOF joints (nj ), 2 DOF joints (nj 2 ), 3 DOF joints (nj 3 ) and mobility (M). nl 3 nj 2 nj 2 0 nj 3 0 M 2 6) Diagram the topology of your mechanism. 7) Submit PDF copy.
31 Name: John Vieni ) Download 2) Obtain a digital image of a mechanism, and paste it into this Word document. You may take a digital photo, scan a hardcopy photograph or drawing, or obtain an on-line image. 3) Provide a name and brief description of the purpose for your mechanism.
32 Name: John Vieni This mechanism is a wind turbine. The purpose of this mechanism is to produce energy by, capturing the wind. The turbine does this by yawing the turbine into the wind at joint A. The blades pitch at joints C, D, and E according to the instantaneous wind speed. Consequently the rotor spins at joint B. 4) Use the MS-Word drawing toolbar or other drawing tools to draw a skeletal diagram for your mechanism. Insert that drawing into this Word file. Clearly label the links and joints. Number the links using for the ground link, and letter the joints B E D 5 7 C A 2 8
33 Name: John Vieni 5) Identify the number of links (nl), DOF joints (nj ), 2 DOF joints (nj 2 ), 3 DOF joints (nj 3 ) and mobility (M). nl : 8 nj :5 nj 2 :0 nj 3 :0 M: 6(8-)-5(5)=7 6) Diagram the topology of your mechanism B E D 5 7 C A 2 8 7) Submit PDF copy.
34 Name Grant Weekes ) Download 2) Obtain a digital image of a mechanism, and paste it into this Word document. You may take a digital photo, scan a hardcopy photograph or drawing, or obtain an on-line image. 3) Provide a name and brief description of the purpose for your mechanism. Eureka Optima Vacuum Cleaner Allow easy cleaning of floors. Specific features of this mechanism that enable the easy cleaning are listed in the answer to question 5, following the mechanism analysis. I assume the joint from the handle through my body back to the floor is a J6 joint (I am not preventing the vacuum handle from rotation along any axis with respect to the floor, nor movement in any direction.)
35 Name Grant Weekes 4) Use the MS-Word drawing toolbar or other drawing tools to draw a skeletal diagram for your mechanism. Insert that drawing into this Word file. Clearly label the links and joints. Number the links using for the ground link, and letter the joints. Links Joints : Operator A: Hand (J6) /Ground B: Handle to 2: Handle Neck () 3: Neck C: Neck to 4: Body Body (P) 5: oller D: Tank to oller () 6/7: Wheels E/F: Simple Axels and Non-Slip Wheels that can pivot ( and P*) 8/9: Small Wheels G/H: Simple Axels and Wheels that allow slippage in plane (/2DOF) v ωr 8 G 9 H v ωr 6 E 7 F v = ωr D 5 v = ωr 4 C 3 B 2 A 5) Identify the number of links (nl), DOF joints (nj), 2 DOF joints (nj2), 3 DOF joints (nj3) and mobility (M). Use M = 6(nL-) - 5 nj - 4 nj2-3 nj3- -0 nj6 nl _9 nj 7 nj2 2_ nj3 2 nj6 M = - Treating each axel-to-wheel and each wheel-to-ground joint as individual joints (Four J evolutes for the axels, Two J2 joints with the back wheels which can roll forward and can rotate on a point in the plane, and Two small front wheels that can slide anywhere in the plane or pivot within the plane) I get - degrees of freedom. However, considering the unique geometry of the wheels, I can simplify the axel-to-wheel-toground set of joints. Effectively, the four wheels make a single joint from the roller to the ground which allows forward motion and in-plane rotation of the roller 2DOF. This revised perspective gives the following equation: M = 6(nL-) - 5 nj - 4 nj2-3 nj3- -0 nj6 = 6(5-)- 5*3-4* - 3*0-0*= 5. These 5 degrees of freedom can be summarized as follows: i. otation of the yellow handle on the silver neck. ii. Adjustment of neck length. iii. Adjustment of tank to roller angle. iv. olling of roller. v. otation or pivoting of roller.
36 Name Grant Weekes 6) Diagram the topology of your mechanism. Individual consideration of wheels: H5,H9 G5,G8 F5,F7 E5,E6 5 D 4 C B 2 G9,G G8,G F7,F E6,E A Treatment of wheels as joint to ground to account for special geometry: D 4 C 5 3 B 2 E A 7) Submit PDF copy.
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