Quite often, the desired output parameters for engineering calculations are precise quantitative values. This approach is entirely justified in the simulations of many physicists. For example, we need exact temperature values for engine cooling or drag values for cars to ensure the correct operation of the system.
However, in the case of mechanical simulations, an entirely different approach is being used more frequently. In some industries such as construction or aviation, we have vast experience in calculations and computer simulations. Based on this experience, we know the exact values of the loads our object will experience during operation as well as optimal safety margins for our design. The certainty of these two parameters together allows us to optimize the design. Modern aviation is the best illustration of this phenomenon, as new planes are optimized in every aspect, being highly economical, comfortable, lightweight, and reliable.
But what if one of these parameters is missing? Or even worse, there are neither one nor the other? What if you are designing a product that has no analogs, and there is no prior experience to draw from? The best solution is to perform a comparison-based analysis. We change the question "how reliable is it?" to "better or worse?" This approach allows you to optimize and improve the design even if you do not know the exact conditions of operation.
If you ask your CAE engineer to reduce the product's weight by 5-7 percent without increasing stress, he will start a comparative analysis. In this case, he will compare design iterations. What else can be compared? Of course, we can compare different design options to find the best one. We can compare our product with competitors' products, and there is a vast list of comparative analysis combinations. This approach allows us to improve the design rather than just formally determining the safety factor.
Contact FEAtech and we will be happy to conduct a comparison-based analysis for you.
