A mechanical engineer is writing a design specification example

Furthermore, those requirements might lead to a third set of requirements that will describe the support system and even more details.

Mechanical engineering design requirements

Lastly, writing the ERD is the first step in establishing a sound test plan. How you control that can be as simple as a visual control or as elaborate as adding a sensor. Finally there will be the technological solutions setting that will list the parts, manufactured or available to buy, that the machine will require. Most of these problems arise from the belief that the functional specification must fully describe and define every functionality and feature in exhaustive detail. Durability and performance characteristics from the PRD will inform the choice. Means of control are often disregarded yet very important, even in the first steps of the design. White is notoriously hard to get right, and Pantone C is not suitable for communicating exactly what kind of white you want.

A functional specification is a document that describes the critical requirements and features of a design project. Take our speaker for example again: there are buttons to control volume.

Specific painting, blasting, brushing, and polishing techniques can be worked out with the contract manufacturer at a later stage. The industrial design spec usually comes in the form of a surface CAD model and a CMF color, material, finish document.

Most of these problems arise from the belief that the functional specification must fully describe and define every functionality and feature in exhaustive detail.

functional design specification engineering

Think of the functional specification as a map of a meadow leading toward a big red X, with a few red dots that mark the path, rather than a highly scaled map with hundreds of red dots at 0. After a draft has been written, the product and design teams can read the ERD and check those assumptions, ensuring product and design intent are sufficiently captured.

Engineering requirement specification

The FAST diagram is an elaborate tree that takes start from one main requirement see basic example in Fig. Most of these problems arise from the belief that the functional specification must fully describe and define every functionality and feature in exhaustive detail. The surface model needs to be converted to a solid CAD model, and the CMF document needs to be translated into a mechanical engineering spec. The industrial design spec usually comes in the form of a surface CAD model and a CMF color, material, finish document. Was this article helpful? The PRD also says that the speakers should be bass-heavy. After a draft has been written, the product and design teams can read the ERD and check those assumptions, ensuring product and design intent are sufficiently captured. Yet, thanks to advances made in quality, security and protection fields, you can easily quantify them by quoting standards or assigning systems, whether they are mechanical ones used to prevent accidents, or management ones that quality departments build onsite. If technical language is not used a functional specification can be left wide open to personal interpretation. If the plastic parts require texturing, in-mold is a good way to go. Tip 7: Define the control criteria How do we know that a requirement is valid or fulfilled? First of all, writing an ERD enables collaboration. Because of its perceived complexity, some people do away with it altogether and others write a quick one just for the sake of audits. Why require something if it cannot or will not be tested? Means of control are often disregarded yet very important, even in the first steps of the design.

However, once general requirements are agreed upon with the client and the designers begin to work, the functional specification can sometimes stray from a neat, quantitative document.

Spend as much time as you need on them but make sure to fully realize what the client needs and expects from you. The surface model needs to be converted to a solid CAD model, and the CMF document needs to be translated into a mechanical engineering spec.

This might even result in the creation of a new requirement. To an audio engineer, this translates to a set of frequency response graphs with certain shape—these graphs will be the engineering specification.

If the plastic parts require texturing, in-mold is a good way to go.

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How to Write an Engineering Requirements Document