Modular design, or ""modularity in design", is a design approach that subdivides a system into smaller parts called modules or "skids, that can be independently created and then used in different systems. A modular system can be characterized by functional partitioning into discrete scalable, reusable modules; rigorous use of well-defined modular interfaces; and making use of industry standards for interfaces.
Besides reduction in cost (due to less customization, and shorter learning time), and flexibility in design, modularity offers other benefits such as augmentation (adding new solution by merely plugging in a new module), and exclusion. Examples of modular systems are "cars, "computers, "process systems, "solar panels and "wind turbines, "elevators and modular buildings. Earlier examples include "looms, "railroad signaling systems, "telephone exchanges, "pipe organs, "synthesizers and "electric power distribution systems. Evolution also results in the modular design of species in that homologous modules sharing approximately the same form or function appear in different organisms. Computers use modularity to overcome changing customer demands and to make the manufacturing process more adaptive to change (see "modular programming). Modular design is an attempt to combine the advantages of "standardization (high volume normally equals low manufacturing costs) with those of "customization. A downside to modularity (and this depends on the extent of modularity) is that low quality modular systems are not optimized for performance. This is usually due to the cost of putting up interfaces between modules.
There is no use of modular design in automobiles although that has not always been the case. All of the companies that comprise the automobile manufacturing industry have chosen to manufacture using short-lived, non-standard, replaceable parts instead of industry-standard or even merely company-standard interchangeable parts. Almost all automobile parts are manufactured as short-run, make and model specific, mini-monopolies which allows for near-monopoly pricing, limits innovation, and promotes premature scrappage due to part unavailability. Not only are firm standards not accepted by the industry, but make/brand standards are also not utilized. Finally, there are no standards even within models over time.
Modular design can be seen in certain buildings. Modular buildings (and also modular homes) generally consist of universal parts (or modules) that are manufactured in a "factory and then shipped to a build site where they are assembled into a variety of arrangements.
Modular buildings can be added to or reduced in size by adding or removing certain components. This can be done without altering larger portions of the building. Modular buildings can also undergo changes in functionality using the same process of adding or removing components.
For example, an "office building can be built using modular parts such as walls, frames, doors, ceilings, and windows. The interior can then be partitioned (or divided) with more walls and furnished with desks, computers, and whatever else is needed for a functioning workspace. If the office needs to be expanded or redivided to accommodate employees, modular components such as wall panels can be added or relocated to make the necessary changes without altering the whole building. Later, this same office can be broken down and rearranged to form a "retail space, "conference hall or another type of building, using the same modular components that originally formed the office building. The new building can then be refurnished with whatever items are needed to carry out its desired functions.
Other types of modular buildings that are offered from a company like Allied Modular include a "guardhouse, machine enclosure, "press box, "conference room, two-story building, "clean room and many more applications.
Many misconceptions are held regarding modular buildings. In reality modular construction is a viable method of construction for quick turnaround and fast growing companies. Industries that would benefit from this include healthcare, commercial, retail, military, and multi-family/student housing.
In 1963 "Motorola introduced the first rectangular color picture tube, and in 1967 introduced the modular "Quasar brand. In 1964 it opened its first research and development branch outside of the United States, in Israel under the management of Moses Basin. In 1974 Motorola sold its television business to the Japan-based Matsushita, the parent company of Panasonic.
Modular design in computer hardware is the same as in other things (e.g. cars, refrigerators, and furniture). The idea is to build computers with easily replaceable parts that use standardized interfaces. This technique allows a user to upgrade certain aspects of the computer easily without having to buy another computer altogether. This idea is also being implemented in "Project Ara, which provides a platform for manufactures to create modules for a smartphone which can then be customised by the end user.
A computer is one of the best examples of modular design. Typical modules include "power supply units, "processors, "mainboards, "graphics cards, "hard drives, and "optical drives. All of these parts should be easily interchangeable as long as the user uses parts that support the same standard interface. Similar to the computer's modularity, other tools have been developed to leverage modular design, such as "littleBits Electronics, which snap together with interoperable modules to create circuits.
During the presentation of the "PLM centre of University of Michigan, Grieves launched inside the modular design contest the initial idea of "Conceptual ideal for PLM", that introduces: real space, virtual space, the link for data flow from real space to virtual space, the link for information flow from virtual space to real space and virtual sub-spaces. Egan (PTC Inc) disclosed the strategy for an implementation of modular design in a PLM contest through a process that starts with a cross-functional input to the definition of the product architecture, and includes an architecture development program that keeps the integrity of the product during its lifecycle. Grieves has produced an effective definition of "digital twin: “A strategic business approach that applies a consistent set of business solutions in support of the collaborative creation, management, dissemination, and use of product definition information across the extended enterprise from concept to end of life –integrating people, processes, business systems, and information”.
Some authors observe that modular design has generated in the vehicle industry a constant increase of weight over time. Trancossi  advanced the hypothesis that modular design can be coupled by some optimization criteria derived from the "constructal law. In fact, the constructal law is modular for his nature and can apply with interesting results in engineering simple systems. It applies with a typical bottom-up optimization schema:
A better formulation has been produced during the MAAT EU FP7 Project. A new design method that couples the above bottom-up optimization with a preliminary system level top-down design has been formulated. The two step design process has been motivated by considering that constructal and modular design does not refer to any objective to be reached in the design process. A theoretical formulation has been provided in a recent paper, and applied with success to the design of a small aircraft, the conceptual design of innovative commuter aircraft, the design of a new entropic wall, and an innovative off-road vehicle designed for energy efficiency.
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