MEEG 2103 Mid Semester study guide Try to provide a detailed summary of the concepts covered in this class by answering the following ques ons. 1. What are stakeholders and how do they affect the design of products? Stakeholders are individuals or groups who have an interest or influence in the outcome of a product design project. They can be internal or external to the organiza on that is developing the product. The aims and preferences of people set the requirements for a new product. 2. What are customer needs and what are some different types of customer needs? Customer requirements: These are the needs and expecta ons of the customers, expressed in their own words. This is some mes called the “Voice of the Customer” 3. What does the Kano model say about product features? The Kano model is a framework for priori zing features of a product based on the level of customer sa sfac on they can bring. Basic features are the ones that customers expect and take for granted, such as the brakes of a car. They do not increase sa sfac on if present, but they cause dissa sfac on if absent. Performance features are the ones that customers are aware of and can compare with compe tors, such as the speed of a car. They increase sa sfac on if present and decrease sa sfac on if absent. A rac ve features are the ones that customers do not expect and are pleasantly surprised by, such as a sunroof of a car. They increase sa sfac on if present, but do not cause dissa sfac on if absent. The Kano model helps product managers and designers iden fy the op mal mix of features that can sa sfy and delight customers while being feasible to implement. 4. What are 3 different methods for genera ng customer needs and the unique benefits to each? – Contextual inquiry: A method of observing and interviewing stakeholders while they perform their tasks in their natural environment. This allows the designer to understand the context of use, the goals and challenges of the stakeholders, and the current workflows and processes. – Focus group: A method of gathering feedback from a group of stakeholders who share similar characteris cs or experiences. This allows the designer to explore different perspec ves, opinions, and a tudes on a topic or a product concept. – Persona: A method of crea ng fic onal characters that represent different types of stakeholders. This allows the designer to empathize with the stakeholders, and to design for their needs, goals, and pain points. – Journey map: A method of visualizing the steps and emo ons that a stakeholder goes through when interac ng with a product or a service. This allows the designer to iden fy the opportuni es and challenges for improving the stakeholder experience. – Card sor ng: A method of asking stakeholders to sort a set of cards with words or images into categories that make sense to them. This allows the designer to understand how the stakeholders organize and label informa on, and to design an intui ve informa on architecture. 5. Generate a func onal representa on of a coffee maker (or similar common product). Make sure you only have func ons and flows, no components. Reflect on how you could iden fy different components to accomplish the func ons of the coffee maker and sketch a “novel” coffee maker with those new components. a. Boil Water: Hea ng Element b. Water Pumped Through Pipe: Peristal c Pump c. Water Drips onto Beans: Nozzle to regulate flow and disperse fluid d. Grind Beans: Burr Grinder e. Ground Dropped Into Basket: Burr Grinder flips over by use of servo motor f. Coffee Drips Into Decanter: Holes in basket lead to funnel that leads to decanter 6. Look at your team’s house of quality. What are all the sec ons of the House of Quality and how would you use it to help guide your decision making? 7. Look at your teams Pugh chart and understand what it was used for and how. 8. Look at the morphological chart you made. How did you fill it out? What was it useful for? 9. Consider how your team will move forward through the detailed design stage (Constraints, Configura on, Connec ons and Components). 10. Make a table of common off the shelf components and iden fy some of the controlling design factors for each 11. What types of motors would you use for each applica on: robot arm links, running a conveyor belt, moving a 3D printer bed up and down? Servos are commonly used for applica ons that require precise angular movement, such as robo c arms. Servos are DC motors. Geared motors are suitable for applica ons that require high torque at low speed, such as conveyor belts. Geared motors are DC motors. Stepper motors are ideal for applica ons that require accurate posi oning. Stepper motors can be found on many manufacturing machines such as 3D printers. Stepper motors are DC motors. -Geared motors are DC motors that have a gearbox a ached to them, which reduces the speed and increases the torque of the output sha . Geared motors are suitable for applica ons that require high torque at low speed, such as conveyor belts, elevators, or robots. -Stepper motors are DC motors that rotate in discrete steps, which can be controlled by pulses of current. Stepper motors are ideal for applica ons that require accurate posi oning, such as printers, scanners, or CNC machines. -Stepper motors can be found on many manufacturing machines such as 3D printers, linkages systems and other manufacturing lines. -Servos are DC motors that have a feedback mechanism that allows them to adjust their posi on and speed according to a signal from a controller. Servos are commonly used for applica ons that require precise angular movement, such as robo c arms, cameras, or antennas. 12. Pick a large gear train value (greater than 1:10) and sketch out a possible gear system for it. Specify, pitch, pressure angle, type of gear and number of teeth. 13. Sketch a 4 bar linkage mechanism for opening and closing a green house window vent that can be driven by a motor with con nuous revolu ons. 14. Iden fy a product hat uses a 4-bar linkage that has a toggle posi on, describe what about the links parameters leads to the mechanism have that toggle posi on and what it enables in the product. What is o en more useful for machine design is toggle posi ons for non-Grashof mechanisms. The toggle posi on of coupler and follower (or link 3 and 4 from the image below) can be inten onally designed to provide a locking feature for the mechanism. For example, this is used in linkage mechanisms that support folding table legs and locking pliers. For a Grashof mechanism, the toggle posi on is when the driver and coupler (labeled links 2 and 3 below) are co-linear. Co-linear means lying in the same straight line. Set up an account with Lucid using the following informa on: https://www.lucidchart.com/pages/usecase/education Sign up for a free account. Make sure to use your uark email address and mark it as educational to get the education user benefits. Open a concept map (also called mind map) template you like and make a concept map that connects all the ideas below (plus add your own) Engineering Design Detailed Design Design stages Product Vision Design (as a noun) Seman c Models SWOT analysis System Design (as a verb) Graphical Models Gan Chart House of Quality Idea on Techniques Connec ons Configura on Pins Spur Grashoff Minimum transmission angle Stakeholders Springs Helical Degree of Freedom Toggle posi on Project Descrip on Customers Product Descrip on Users Pugh Chart Conceptual Design Voice of the customer Concept Structure Prototypes Engineering Requirements Constraints Assembly Func on Analy cal Models Characteris cs of good teams Morphological Chart Component specifica on Cam Bevel Gruebler Equa on Components Behavior Physical Models Customer Needs Gears COTS Pitch/Module Linkage Chain Linkage synthesis Pressure angle Mechanism Linkage posi on Link displacement Link velocity Mechanical advantage
