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Intro To Mechanical Design

by: Tanner Effertz IV

Intro To Mechanical Design MECE 2361

Tanner Effertz IV
GPA 3.8

Richard Bannerot

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About this Document

Richard Bannerot
Class Notes
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This 8 page Class Notes was uploaded by Tanner Effertz IV on Saturday September 19, 2015. The Class Notes belongs to MECE 2361 at University of Houston taught by Richard Bannerot in Fall. Since its upload, it has received 19 views. For similar materials see /class/208278/mece-2361-university-of-houston in Mechanical Engineering at University of Houston.


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Date Created: 09/19/15
lof8 January 24 2011 MECE 2361 Design I Spring 201 1 Maj or Team Design Project Form Teams February 2quotd Initial Testing March 93911 Final Testing and Device Submission April 11Lh and 13111 Team Oral Presentation April 183911 and 201h Extended Abstract April 27Lh PROBLEM STATEMENT Design fabricate and test a device or set of devices that will autonomously propel a set of identical objects selected by the team on a specified schedule from a height measured from the bottom of the object to the oor of less than four inches at some point in the process a distance of over two feet horizontally into an elevated about 14 inches above the oor horizontal target The target the opening of a plastic planter so an object that enters and remains in the planter is said to have hit the target will be provided by the instructor and will be available for inspection in class at selected times but shall not be available for team practice The device or set of devices may rest on the oor andor on a provided table both the device and the table must remain at least two feet measured horizontally from the target throughout the test All materials other than the planter and the table and the objects are to be provided by the team The Testing of the device will take place at normal class times in the normal classroom Initial Testing on March 93911 and Final Testing on April 11Lh and 13th The device shall weigh less than ten pounds for both tests the lighter the better for the Final Testing There is no restriction on the type of energy used but there can be no external energy source ie the energy source is part of the device Designs using gravitational energy will be viewed more favorably than those using other forms of energy If multiple forms of energy are used the greater the proportion of gravitational energy used the better Batteries are allowed but chemical explosions are not Devices that use excessive energy eg produce excessive velocities will be penalized Safety is of utmost importance both to the people constructing and operating the device and to those observing its operation Unsafe devices will be disqualified and safe devices will be rated higher than those judged to be less safe Teams must submit their devices immediately after the Final Testing for evaluation Both written and oral reports are required Further information on the constraints goals and evaluation processes are given in this document 20f8 TEAMS Teams of four students each to the extent possible will be formed on February 2 Each team shall declare a name and establish a spirit that should be demonstrated in the esthetics of the device the presentations and the reports Team names may be changed at any time with the consent of the instructor THE DEVICE The device is de ned as all items brought to the testing area except the objects and the tools used for assembly Under no circumstance shall the device in any way cause harm to the operators or the audience or damage to the room or its contents The device shall weigh less than ten pounds for all testing and be designed so that it may be weighed on a simple pedestal scale available for inspection upon request A device weighing more than ten pounds will not be tested For the Final Testing the lighter the device the better as quanti ed by the Figure of Merit de ned in Eqn 1 on page 5 The quotmechanicalquot subsystems of the device should be constructed by members of the team Any exceptions must be noted at the time of the device s evaluation and in the Final Report but may contain prefabricated mechanical components such as gears hinges pulleys wheels bearings and shafts However no kits are allowed Gear boxes must be constructed from individual gears but they may be purchased as a set Vehicles must be constructed from individual parts eg wheels and axle parts ie not from kits or toys Normal simple fasteners such as screws nails bolts rivets tape glue etc may be utilized Fabricated commercial parts components and assemblies can not be used for their intended purpose in the device but may with the instructor s speci c approval be incorporated into the device if they are NOT being used for their intended purpose All questionable components should be submitted to the instructor before being incorporated into the device A team that uses an unauthorized or illegal component or subsystem will be given a quotfailurequot for the test or run in which this component or subsystem is utilized No sticky materials e g tape or glue or clamps are allowed to hold the device in place although suction cups and friction mats are acceptable and counted as part of the device ie included in its weight Nothing is allowed to penetrate the table the oor or the rug eg tacks No damage either physical or esthetic shall be in icted on the oor the room or its contents OBJECTS The objects are to be selected by the team and are NOT counted as part of the weight of the device during the testing The only restrictions on the objects are that they must 0 be clearly visible from a distance of ten feet throughout the testing 0 have their longest dimension at least as long as the diameter of a golf ball and o be safe that is impose no danger to anyone or anything during the testing 3of8 OPERATIONS The target is the interior and hence the horizontal opening of a large plastic planter approximately 14 inches in height with an opening approximately 15 inches in diameter The device may be set up on the oor anywhere behind on the opposite side from the target the twofoot line which will be marked by tape This line will be approximately two feet from the nearest point on the base of the planter or approximately 32 inches from the center of the planter Note that the planter cannot be moved and only the top of the table may be utilized eg not the legs All parts of the table which can be positioned by the team the device and the objects must initially be behind the two foo line All parts of the device and the table shall remain behind the line throughout the testing For the Final Testing the goal is to deposit the objects onto the target and into the planter according to the following schedule only six objects shall be loaded into the device 0 After a delay of seven plus or minus one between six and eight seconds from the initiation of the process three objects shall enter the opening of the planter After a delay of sixteen plus or minus one second from the initiation of the process two objects shall enter the opening of the planter After a total delay of twentyfive plus or minus two seconds from the initiation of the process one object shall enter the opening of the planter For the Initial Testing the requirement is to deposit one object in the planter in between five and seven seconds from the initiation of the process For both the Initial Testing and the Final Testing at the direction of the instructor or his designate a team member will be instructed to initiate the operation of its device after which the device shall operate autonomously no further interaction with the device The initiation shall be in the form of a simple release in which only the device is touched not the object or objects that shall not transfer any energy to the device or the obj ects Only one hand may be utilized in the release process eg the device can not be held with one hand while the other hand releases the objects For the Final Testing at least it is expected that some thought will be given to using an innovative release mechanism During the run no intervention with the device the objects the table or the planter will be permitted The operations end after 30 seconds or when the team signals the termination of its run or the instructor determines that the attempt has been completed The objective is for the device to quotperformquot in as creative and interesting a way as possible The desired attributes of a quotcreativequot performance are 0 to demonstrate innovative concepts to initiate the process to maintain the process and to control the process and o to keep the attention and interest of the audience Teams are responsible for removing their devices and providing any clear up required within 30 seconds after being asked to do so The testing takes place in a new carpeted classroom Every precaution must be taken to assure that no damage to the room occurs 4of8 TIMES AND PLACES FOR THE TESTING AND PRESENTATION The Initial Testing will take place in the regular Wednesday meeting room beginning at 100 PM on March 9m The Final Testing will take place on Monday and Wednesday April llLh and 13m in the regular meeting room beginning at 100 PM Class time may need to be extended on Monday About half the class will test on Monday and the other half on Wednesday The testing and evaluation criteria for both the Initial Testing and the Final Testing are discussed in the next two sections Team presentations for the project will be in the regular Monday and Wednesday meeting rooms during the regular meeting times during the week of April 18m INITIAL TESTING The reguirement for the Initial Testing is to successfully propel one object from within four inches at some point in the process of the oor distance between the bottom of the obi ect to the oor into the planter The obiect must remain in the planter ie not bounce out from a device which is initiallv behind the twofoot line in the twosecond time interval beginning ve seconds a er initiation of the process The order of testing will be determined by the instructor and announced at the beginning of the testing session There will be up to four rounds of testing with each team allowed one test per round in the order designated Each team shall have two minutes to set up and perform any practice attempts Once a team is successful propelling one object into the planter it will no longer be allowed to test Each team will be given two testing opportunities or rounds if necessary in the Initial Testing for full credit Two additional testing opportunities will be allowed for less credit see the Grading Section on page 7 for those devices that are unsuccessful in both of the first two tests Teams unsuccessful in meeting the stated requirements after four tests total will receive zero points for Initial Testing Any team not present and ready to test at 100 PM could be disquali ed for the Initial Testing ie treated as if it failed all four tests as discussed above After one team has removed its device the clock starts for the deployment of the next device There is a limited time for deployment two minutes and removal thirty seconds and a team could be disquali ed for that attempt or test should it not comply FINAL TESTING The Final Testing will take place on two days as part of the class on Monday April l l3911 and the rest on Wednesday April l3Lh beginning at 1 PM or earlier if agreed to by the class in the regular classroom The Monday class may be extended As described above the device will be attempting to propel three objects into the planter at 7il seconds two obiects into the planter at l6il seconds and one obiect into the planter at 25i2 seconds from initiallv behind the twofoot line and within four inches of the oor at some point in the process into the planter The reauirement for a quot 39 Final 50f8 Testing is to propel three obiects into the planter at 7d1 seconds and at least one object into the planter at 16i2 seconds Teams must be present with their devices at 1 PM or before if agreed to by the class to be eligible for the Final Testing Since the testing may take more than three hours each day teams should make arrangements to continue Testing beyond 4 PM if necessary eg make sure at least one member can stay beyond 4 PM The testing may more to an alternative venue after 4 PM If a device that has not been successful three objects into the planter at 7i1 seconds and one object into the planter at 16i2 seconds by 4 PM and if a representative of the team cannot be present to continue the Final Testing the Final Testing will be declared unsuccessful for that device Teams will score points according to the Figure of Merit Equation 1 below which favors devices that are accurate consistent timely and lightweight At their scheduled times teams will bring their devices to the common testing area and will be allowed three minutes to set up and practice If a device is not able to perform after the threeminute set up time or can not be removed from the testing area within 30 seconds of being told to do so it is disquali ed for that round of testing The goal is to propel the sets of three two and one objects into the target as described above Speci cally the goal is to maximize the Figure of Merit FM defined as FM 10n1n220n330n4 410 W 10n42ABS25 t 1 where ni counters 1 or 0 n1 1 if the rst three obj ects enter the planter at 7i1 seconds otherwise FM undefrned n2 1 if n1 1 and the fourth but not the fth object enters the planter at 16i2 seconds otherwise nz0 n3 1 if n1 1 and n2 0 and the fourth and fifth objects enter the planter at 16i1 seconds otherwise n30 n4 1 ifn1 1 and n3 1 and the sixth object enters the planter at 25i2 seconds otherwise n30 W the total weight in pounds of the device t the time in seconds that the sixth object enters the planter A Figure of Merit will be determined onlv for devices achieving f 39 Final Testing as defined above The testing order will be assigned at the beginning of the testing session Teams will be allowed to participate in two rounds of testing with the higher Figure of Merit counting Teams that fail to achieve a successful test in the rst and second rounds will be allowed to participate in up to two additional rounds under the conditions described above However the resulting Figures of Merit will be reduced by 25 per round Hence there will be two rounds of testing without penalty and two additional rounds of testing with increasing penalties for the initially unsuccessful devices The order of testing shall remain the same Devices that are unsuccessful after four rounds will receive no credit for Final Testing 60f8 If the device is unsuccessful in the rst round it must be removed and presented again after all other devices are tested for Final Testing in the second and if necessary subsequent rounds If signi cant changes are made to the device andor signi cant material is added or removed the device shall be reweighed At the conclusion of the Final Testing teams are responsible for transferring their devices to a location as directed by the instructor A written description of how the device operates in the form of a sales brochure should be left with the device Annotated drawingsphotographs of the device along with appropriate discussions indicating the various aspects of the design would be advisable Special attention should be given in the discussion to the outstanding design features of the device The device needs to be sold This brochure should also be submitted via attachment to an email by 5 PM on the day of testing to the instructor at rbbuhedu The devices should be left in operating condition so that the instructor can evaluated their operation Devices that are not successfully demonstrated during the Final Testing will be evaluated but will be penalized heavily in the Robustness category in the Design Evaluation See Grading Section on Page 7 The devices may be retrieved between 10 AM and 2 PM on Thursday the 14m Additional details will be provided at the time of testing Some teams may be asked that their device be displayed during an ME Department alumni function on April 15 REPORTING Presentation Each team will have up to ten minutes the week of April 18Lh during the normal class period to present a description of its quotsolutionquot The schedule will be posted by April 14th some teams will present on the 18m and the rest on the 20m Presentations should have an attentiongetting beginning and a structured conclusion Descriptions of noteworthy successes and failures in the design and construction processes are usually effective in holding the audience s attention All team members are expected to participate equally in the presentation Teams are expected to make a PowerPoint or 139 39 1 39 The 39 shallbe 39 quot J 39 39 quotytothe instructor by 10 AM the day of the quot Files should be labeled to indicate the team number and name eg Team 7 Cougars Please compress your photographic images before inserting them into the electronic presentation The presentation le will hopefully be less than a couple of MBs You are invited to attend the presentations on both days but are reguired to attend only on the day your team is presenting and on that dav to remain for the entire class period You will be invited to participate in the discussions of the devices after each presentation Note When preparing an oral presentation practice makes perfect Extended Abstract A hard copy of the team s Extended Abstract is due at the beginning of class on April 27 The Extended Abstract consists of two 812 by 11 inch pages at least oneinch margins on all sides with text single oneandahalf or double spaced Times New Roman 7 12 or 7of8 equivalent Try to ll the page on the rst page and tables and gures usually four or less on the second Try to ll the page It is usually printed on the front and back of a single page These gures and tables should be numbered titled and referenced in the text The document is similar in content to the abstract for a report but it is longer It should contain more details including test results and of course the gures and tables that are not permitted in a report abstract The text page of the Extended Abstract should have a header which includes the team name and number and the names of the team members 39 version of the Extended Abstract should be 39 39 J by email to the instructor by 5 PM on April 27 GRADING points Initial Testing 10 Final Testing 35 Presentation 10 Design Evaluation 35 Extended Abstract 10 A device that is successful in either of its first two attempts at the Initial Testing receives 10 points Devices successful in their third attempt receive 7 points in their fourth attempt 4 pomts The score for the Final Testing will be awarded on a linear scale The device with the highest EM will receive full credit 35 points The scores for the other devices will be determined by the fraction of their FM to the maximum FM That is a team whose FM is 75 of the top team will receive 80 of 35 or 28 points For the Design Evaluation the following rubric will be used I Concept selection 20 As much as half credit may be lost for using a nongravity source of energy Otherwise the quality of the concept selection based on its uniqueness and the probability of success will be assessed I Creativity in executing the concept 20 How was the concept implemented Was it not like everyone else s Was it likely to work Did it show good thinking I Craftsmanship and esthetics 20 How does it look How much care was exercised to make look good Does it represent the spirit of the team name I Robustness 20 Does its operation require special care or could anyone just walk up and operate it Does it look like it will work for a few days or just during the testing period I Sales Brochure 20 What s overall quality and content Does it make good use of graphics andor photographs Normally each team member receives the team grade However as part of the nal exam each team member shall submit a completed form provided by the instructor indicating hisher estimate of the extent to which other members of the team ful lled their responsibilities for the project The instructor will take these completed forms and his own observations during the semester into account when assigning each student s grade for the project 80f8 COST It is suggested that the total material cost should not exceed 100 however there is no penalty for spending more You should provide an itemized list of the materials their sources and costs in the Final Report Cost estimates should be included for borrowed donated andor other quotfreequot items SOME FINAL COMMENTS Ideas and designs shall be original and construction should be performed by team members Exceptions should be noted in the Final Report and may affect the team grade It is suggested that the team discuss this issue with the instructor at the time the work is done if the members feel there may be an issue No preconstructed assemblies are permitted in the design Devices may change at any time e g between the Initial Testing and Final Testing since new ideas may emerge after seeing the solutions of others quotRuggednessquot is usually an important feature of most successful designs All rules are subject to interpretation by the instructor and may even be changed should circumstances merit such action


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