Mechanical design and Product development process

Identify opportunities and customer needs, plan the product development, generate and evaluate concepts, and advance from system design to detailed design through testing and production.

Learning drives product development by growing knowledge from idea to prototype, boosting confidence and surfacing issues. Physical prototypes yield more learning than paper concepts, and documenting learnings prevents repeating mistakes.

Advance the design early to front-load knowledge of the problem domain and preserve design freedom. Avoid costly changes by freezing configurations late; iterate early for a first-time-right solution.

Explore the Triz framework for problem solving and the five levels of innovation, from conventional design and material-based enhancements to solving contradictions, major system upgrades, paradigm shifts, and pioneering breakthroughs.

Meet the core team for mechanical product development, led by a project leader coordinating a cross-functional mix of product design engineers, industrial designers, marketing, manufacturing, and supply chain specialists.

Identify and evaluate market opportunities as solved problems for specific user groups, distinguishing known territory opportunities—cost reduction and product variants—and unknown territory breakthroughs with higher risk and potential.

Classify opportunities by technology-market combinations, from better products in existing markets to new solutions in new markets. See examples like iPhone, smartwatch, solar energy, and electric vehicles.

Explore how imitation creates opportunities by adapting or replicating products, as shown by the iPhone launching the smartphone era and later 3D printer variants after patent expiry.

Identify good product opportunities by assessing market demand, size, pricing, tech availability, competitive advantage, and IP protection, then balance desirability, feasibility, and viability for low uncertainty, costs, and engineering talent.

Explore market research methods to uncover opportunities for new products by directly asking customers through surveys, interviews, and social media, plus observing users for pain points, trends, and technology insights.

Identify customer needs in design, from primary needs such as functionality and safety to secondary needs like ergonomics and looks, plus special needs such as sustainability and portability.

Explore the kernel diagram for customer needs, linking satisfaction to functionality and identifying threshold, performance, and delight needs. See how needs evolve from delight to basic, guiding product development priorities.

Identify three user types: lead users, average (mainstream) users, and extreme users, and explain how their needs drive product development in mechanical design.

Empathy requires designers and engineers to walk in the customer’s shoes, uncovering exact needs, usage patterns, and terrain-related difficulties to guide safe, effective product design and informed trade-offs.

Interpret the voice of the customer by converting plain statements into technical design specifications. Link designer and manufacturer by translating needs into target specs, balancing objective requirements with subjective comfort.

Explore how customer needs are defined for a concept by distinguishing spoken and unspoken needs, illustrated with a compact, precise, easy-to-use vernier caliper-like device for tight spaces.

Capture raw data from customers via interviews and surveys, translate into clear needs, and prioritize them in a hierarchy using the Kano model, with focus on safety, regulations, and performance.

Convert customer needs into engineering requirements and specifications by defining engineering characteristics and design parameters. Distinguish design variables from constraints to meet needs using qualitative and quantitative attributes.

Explores identifying customer needs for a screwdriver—ergonomic handle, lightweight, durability, magnetic tip, corrosion resistance, and easy maintenance—and links them to engineering attributes and design variables to meet requirements.

Identify the opportunity, then plan how to develop the product by detailing timeline, resources, and responsibilities to avoid delays and misallocation while guiding the journey to the final product.

Define product specifications as the measurable details that address customer needs, guiding concept generation with objective targets such as torque and vehicle handling, while noting that preliminary specs may evolve.

Break down a need into requirements and specifications using a car's comfort experience, converting vibration, seat comfort, noise, steering wheel, and gearshift into measurable specifications.

Differentiate engineering requirements from design constraints by identifying performance-related, measurable criteria the product must meet versus non-negotiable boundaries like size, budget, safety, and standards.

Metrics measure product performance by distinguishing subjective metrics, rated by personal judgment, from objective metrics, recorded with units, such as force, displacement, torque, vibration, and noise.

Set precise, measurable target metrics that reflect how well a product satisfies needs, are practical within resources and cost, and use exact or range values with objective or subjective scales.

refine specifications at every stage, from preliminary targets in concept generation to final specs after detailed design, especially for complex products with multiple trade-offs.

Benchmarking evaluates a product's features, performance, materials, and design against industry standards or best in class, while reverse engineering dismantles existing products to learn and improve new designs.

Explore how inverse relationships drive trade-offs in mechanical design, balancing weight, cost, durability, vibration, stiffness, ride comfort, and handling to set optimal specifications.

Identify critical areas and interdependencies in the concept stage to set a reference specification. Select material for a key component to drive durability, stiffness, reliability, cost, and weight.

Learn how quality function deployment links customer needs to engineering characteristics through the house of quality, prioritizes requirements, and guides product development from concept to production.

Learn how QFD is demonstrated on a humble adjustable wrench, using a spreadsheet format to link customer needs with engineering parameters and their interrelationships.

Explore a qfd for a lawn mower, linking customer needs like cutting thick grass, uniform cut, maneuvering, safety, and maintenance to engineering parameters such as cutting width and blade speed.

Analyze how QFD connects cutting width, blade speed, engine power, weight, and turning radius in lawn mower design, highlighting blade speed, engine power, and turning radius as key drivers.

Analyze how quality function deployment links car customer needs, including safety, reliability, comfort, and environmental impact, to engineering parameters like power, weight, suspension, and body type, ranking their importance.

Apply qfd to compare a sheet metal bracket and a molded redesign, linking materials, geometry, and coatings to durability, rigidity, aesthetics, and lightweight performance under vibration and moisture.

Generate a wide range of concepts from customer needs and specifications using sketches and 3d models, ensuring exhaustive exploration of alternatives before selecting the best concept for development.

Cultivate high quality ideas during the concept phase by leveraging creativity, psychology, and domain knowledge. This mirrors the preparation, incubation, flow, and verification cycle in product development.

Develop creative cognitive ability by synthesizing ideas from multiple perspectives, asking what-if questions, cross-domain concepts, and rapid prototyping, while overcoming mental blocks like insufficient knowledge, information overload, and risk aversion.

Explore the funnel of ideas in concept generation, where a large pool of ideas is filtered into feasible concepts for development through feasibility assessment and selective discard.

Explore how the scamper framework guides mechanical design teams to generate concept ideas using substitute, combine, adapt, modify, magnify or minimize, put to other use, eliminate, and rearrange or reverse.

Explore TRIZ, the theory of inventive problem solving, and its 40 inventive principles to resolve engineering contradictions and parameters, drive product innovation, and design modular, patentable systems.

Formulate the problem thoroughly to guide concept generation, then search for ideas, generate concepts, and explore them systematically to arrive at multiple solutions, and divergent and convergent thinking guide expansion.

Align target cost with concept generation and development, linking desirability, viability, and functionality while tracking a rough bill of materials to identify cost-critical areas early.

Explore concept generation for simple versus complex products; a comb's sketch conveys form and function, while a bicycle requires functional and physical decompositions to reveal mechanisms.

Explore functional decomposition by breaking a bicycle’s primary function into sub functions like drive, brake, steer, and structural support, then integrate them in concept and detailed design phases.

Physical decomposition breaks physical elements into components to build the whole assembly, illustrated by bikes and cars with subsystems and parts like tires, rims, and powertrain, linking to assembly procedures.

Characterize a system's function by mapping energy, material, and information flows across forms like mechanical, hydraulic, electrical, thermal, and magnetic energy, plus material transfer and signals.

Explore common function names that describe how mechanical systems perform actions, from disassemble and remove to transfer, sense, stabilize, assemble, and regulate, with real-world examples.

Explore functional characterization of basic components by identifying input energy, output energy, and core function, with examples such as an electric motor, a coil spring, and an engine mount.

Identify the system’s final function and its energy, material, or signal inputs and outputs; decompose into subfunctions and arrange blocks in series or parallel with any needed extra inputs.

Decompose the adjustable spanner's function into grip, bolt head location, screw adjustment, and torque application. Emphasize energy and information flow to optimize the concept design.

Break down lawn mower's function with functional decomposition into subfunctions and illustrate how fuel, information, and human energy power the engine and blades to produce the cut and collect grass.

Develop a function structure through functional decomposition to represent the system's flow and support concept generation. Focus on sub functions and potential integration to guide later design.

Decompose problems into their smallest bits to tackle the larger problem and generate creative solutions for assemblies and complex products.

Apply the Pareto principle to identify the critical design parameters that drive most of the final performance, focusing on weight distribution, center of gravity, and engine design.

Learn brainstorming as a key idea-generation tool for individuals and teams. Apply rules: delay judgment, generate many ideas, record all, and use stimuli like sketches and props to foster variety.

Generate concepts through creative problem solving using stimulus from images, diagrams, and text. Harvest ideas from internet searches, patents, papers, catalogs, and competitive products, while considering manufacturable design for manufacturing.

Explore creative problem solving through mind mapping, lateral thinking, vertical thinking, and analogies, then apply structured methods like Trace, Trees, and Scamper to generate innovative product concepts.

Assess proof of concept prototypes that demonstrate functional feasibility for new mechanisms, reducing risk early in product development, and contrast with form only models evaluating ergonomics and aesthetics.

Compare generated concepts to a reference via a weighted selection matrix, then rank them by weight, ease of assembly, opening effort, durability, and ease of manufacture to identify superior concept.

Compare two awning mounting concepts, a pivot-based link system and a rigid bracket, evaluating weight, ease of assembly, durability, rigidity, aesthetics, and ease of manufacture.

Use a weighted scoring method to evaluate concepts by applying criterion weights such as operating effort and ease of operation, rating concepts, and computing a final score to determine superiority.

Apply a weighted Pugh matrix to compare electric and pneumatic grippers for a robot end effector, evaluating grip strength, weight, precision, energy use, cost, maintenance, safety, and speed.

Apply a weighted Pugh matrix to compare the two shock absorber mount concepts, evaluating vibration isolation, load distribution, durability, installation, maintenance, cost, and showing the stacked bush mount scores higher.

Combine concepts by leveraging strengths and reducing weaknesses to yield superior designs. Improve each concept through iterative material choices—durable and lightweight—and divergent and convergent thinking in the product development process.

Explore system design and product architecture by decomposing complex products into modules and subsystems, and understand how weight distribution and module synergy shape vehicle handling.

Explore product architecture as the arrangement of functional elements within physical systems, and how configurations like rear-wheel and front-wheel drive shape interfaces and team-based design delegation.

Modularity subdivides a product into separate modules that assemble into the whole, as in cars, computers, Lego bricks, and modular buildings—an essential concept in mechanical design and product development.

Modularity improves interchangeability and allows upgrading specific modules without redesigning the whole product. It streamlines manufacturing, assembly, configurable variants, and maintenance by isolating functional elements into replaceable modules.

Integral construction reduces the total number of parts, cutting cost, material use, and assembly time, while shortening development time; unibody designs often offer better aesthetics.

Explore physical, thermal, and electrical interfaces that govern how mechanical elements interact, including clearances, heat transfer, material flows, loads, signals, and vibrations, with engines and exhaust systems as examples.

Examine how product architecture determines downstream activities and interdependencies, where integral designs hinder changes while modular architectures enable variety, standardization, and easier design for manufacturing and assembly.

Product architecture emerges from concept to system design, driving concept generation; in automotive development, engine location shapes car geometry, aerodynamics, and weight distribution, reflected in sketches.

Harness modular product platforms to standardize parts across modules, lowering costs and easing manufacturing. In automotive design, five interchangeable modules form diverse vehicles, as in the Volkswagen MQB platform.

Map the interfaces of a simple motor-driven pulley system, detailing signal flows and mechanical load, torque, and heat transfer across switch, motor controller, motor, shaft, bearing, mounting base, and pulley.

Transition from system design to detailed design by defining product architecture and embodiment, and applying configuration and parametric design to set critical dimensions and tolerances.

In the detailed design phase, detail each component and assembly after architecture is set. Prepare engineering documents and testing plans while ensuring manufacturability through collaboration with suppliers and process engineers.

Learn how a structured bill of materials tracks every part and specification in complex systems, from cost and weight to manufacturing methods, enabling clear product development insights.

Design for x focuses design efforts on specific requirements such as safety, durability, or ergonomics, cascading customer needs to components while emphasizing design for manufacturing and assembly.

Navigate the detailed design phase by assessing function, durability, reliability, manufacturability, and efficiency. Also address safety, ergonomics, usability, aesthetics, portability, modularity, serviceability, wear, environmental resistance, material selection, sustainability, and regulations.

Engineering drawings are the official design document and key communication tool between designers and manufacturers, detailing dimensions and tolerances to prevent costly assembly errors.

Explore how tolerancing schemes defined by geometric dimensioning and tolerancing set critical tolerances to ensure piston and cylinder function, balancing cost, clearance, and reliability in mass production.

Learn to craft a GD&T scheme for a universal joint yoke, including bearing holes, datum A, B, and C, features of size, and tolerance controls.

Explore dfma guidelines to minimize components, use standard parts, enable easy fabrication with proper reliefs and clearances, design tolerances to process capability, and foolproof, self-aligning assembly.

Explore material selection as a core driver of mechanical design, linking properties like strength and hardness to function and durability, while considering aesthetics, safety, and corrosion.

Explain common metal and plastic manufacturing methods, including machining, forging, casting, injection molding, and sheet metal forming, and how cost, volume, capability, finish, time, and material compatibility drive process selection.

Define manufacturing cost as three segments: component manufacturing cost, assembly costs, and overhead. Explain how raw material, tooling, labor, and overhead shape final product cost and guide cost reduction.

Explore design for manufacturing and assembly principles that cut costs by frontloading considerations in concept to tooling phases, minimizing costly changes during production.

Designers minimize part complexity to lower manufacturing cost while preserving function. Recognize that sheet metal costs can rise exponentially with added bends, unlike injection molding where die complexity also matters.

Explore design for forging by converting a CAD model into a forgeable part, detailing parting lines, draft allowances, web width control, and fillet radii for smooth flow in forging.

Demonstrates how design for manufacturing rules apply to an injection molding part by hollowing a solid model, adding ribs and bosses, and ensuring uniform thickness for smooth flow.

Explore engineering analysis as the validation of a design using engineering principles, via hand calculations or computer simulations, including stress, motion, stability, thermal, and fluid flow analyses.

Learn the typical method of engineering analysis, grounded in engineering principles and input data. Assess how assumptions, boundary conditions, and data quality determine the method's correctness and meaningful results.

Understand the final tooling release in the product development process, where a frozen design moves to production, triggering engineering release and handover to manufacturing with hot tools for high-volume production.

Detail design the vehicle suspension from architecture and geometry, perform engineering analyses for damping ratio and spring stiffness, and prototype and test components and systems before freezing for production.

Explore the design lifecycle of a machine part from concept to detail. Evaluate concepts, select materials and processes, refine geometry, analyze, draw details, prototype, test, and plan tooling for production.

Learn how design failure mode and effect analysis (DFMEA) identifies failure modes, causes, and effects, assesses severity, occurrence, and detection, and defines actions to reduce risk in the design process.

Develop design verification plans that accompany dfma, detailing test specifications, acceptance criteria, sample levels, and responsibilities for testing teams. Attach failure modes with severity and objective or subjective acceptance criteria.