Exegy is an innovative Dutch company which specialises in developing and producing air-to-water and water-to-water heat exchangers made out of thin-walled polyethylene tubes that ensure maximum heat transfer. The heat exchangers and are virtually maintenance-free, resistant to a wide range of fluids and aggressive environments. Exegy focusses on efficiency, stability and sustainability.
Mifa specialises in the extrusion of magnesium and aluminium profiles.
We produce fully-finished precision products with dimensional tolerances from ±0.02mm.
This level of aluminium extrusion precision means unprecedented possibilities. It gives designers freedom in design, without the restrictions of standard specifications. As a result of this it is possible to achieve the optimum product.
Links to Mifa White papers
To validate a design against the requirements, it is important to take the possibility of testing into account when thanking the specification. After all, if a requirement cannot be directly validated (tested), it is necessary to devise methods that approximate the requirement as much as possible. An example of this is the lifetime requirement.
The FMEA is an important method to discover what needs to be tested.
More info see: Engineering validation test Wikipedia
Value Engineering (VE) can be applied to all phases of the product lifecycle.
VE prevents waste in product design and manufacturing, hereby improving project throughput time and cost. VE is more aiming for the target then focus on the savings. VE is preventing waste in product design and manufacturing, hereby improving project throughput time and cost.
VE is balance Value versus Cost to safeguard future profitability & affordability
A designer must know the cost objective and the cost estimate of his or her design.
Approximately 70% of the costs can be influenced at the start of the product design. This cost awareness in the early phase of a design is important to realize a successful product at the desired costs.
The cost target is in most cases defined in the design assignment or design specification. This in turn is a derivative of what the customer is willing to pay.
In general, the cost of a product is the sum of the material costs plus assembly labor and profit.
Because at the start of the design process it is difficult to determine the costs, the following definitions are used:
Level 1 parametric: an estimate based on prior experience. A quick and dirty way to look at cost is to figure out the mark-up for an industry.
Level 2 analogy: an estimate based on prior experience with similar product with documented rationale.Usual cost can be roughly calculated in cost per mass, vulome or surface. Sometimes extrapolation at a trundling can be used . (€/ kW, €/kg, €/part … )
Level 3 analytical: a detailed costing calculation.
Also the production volume is influencing the costs to a large extent.
Below an example of a detailed costing model.
LAURENS VAN LIESHOUT CONSULTANCY
Each design requires a specific methodology.
To realize the design successfully, extensive knowledge of the making processes is necessary.
- Design & Engineering methodology
- Manufacturing knowledge
As an example of a construction fundamental is the use of a thermal center for accurate positioning. This construction fundamental is a comparison for a simple load case that describes the principle of the principle in this case. Because of the simplicity, these fundamentals are relatively easy to memorize, from where the name “forget-me-not”. The forget-me-nots are widely used in the engineering sciences, such as mechanical engineering and civil engineering.
For the overview of the fundamentals see KSC
Often the specification is not complete and not well well thought out. One of the pitfalls for the engineer is starting the design process before the specification is complete and reviewed with all the stockholders. All design specifications have in common that they capture the design in detail.
A commonly used format is the following.
- A summary of the purpose of the required product or process.
- Why do they need the product or process?
A summary of the preconditions.
- This can be the production cost price, the development time.
A summary of the functions.
- Functions are abstract concepts that describe a change of state.
- The function of a light bulb is too illuminate the environment.
A summary of the requirements.
- Requirements from physically measurable quantities.
- This can be the lifespan in years, the strength in N, the cost price in euros.
A list of wishes.
- Desires are usually not physical, non-measurable requirements. For example, that a product must be beautiful.
In complex products usually the so called V model as a design process is used. On the high level of the V model the specification can be limit in size. This will result in a manageable specification on each level of the V model. Each field of discipline or industry has his own sjabloon to define the specification.
For more info see: Functional specification: wikipedia
In the traditional sequential design flow, or “Waterfall Model” tasks wil be processed in a linear fashion. Starting with requirements and sequentially moving forward to design and implementation, until there is a finished product. In this design system, a design team would not quickly look backward or forward to anticipate on problems. In the case that something does go wrong, the design usually must be scrapped or heavily altered. This will take time, cost and frustration. With the introduction of modern media and the use of a virtual model, it is possible to work simultaneously on the same source data. All disciplines involved in the design process share the same basic information. With the help of the virtual model of the future product, it is already possible to identify problems and errors early in the design process. Using the virtual model, it is also possible to perform production simulations. This way manufacturing problems can be prevented. Because all stakeholders are involved in the design, the available knowledge and skills are utilized optimally. Benefits
- the design process is faster by preventing mistakes and miscommunication
- multidisciplinary collaboration ensures all knowledge is used
- costs will be decreased
- quality will be increased
- is supporting the entire project life cycle
- give a competitive advantage
Single source of truth
The prerequisite for enabling concurrent engineering is that there is trust between all team participants and that there is a clear source of truth. This source is usually the virtual model en common shared project documents. The validity and consistency of product information is extremely important.
Motivated team members
Due to the collaborative nature of concurrent engineering, the members of the design team are given more ownership for the design. This will improve the productivity of the employee and the quality of the product. When people get a sense of satisfaction and ownership about their work, they tend to work harder and design a more robust product.