Metrics, Signal Creation and Measurement
💺 💺 "First you have to create the signal, and then you have to measure it." 🛫 🛫 Early in my engineering career, I worked at a test stand and RD&E facility design firm . A client, nicknamed Acme, had a design project for a replacement wind tunnel to test heat exchangers. These heat exchangers used the internal working fluid, at one temperature, exchanging heat with another fluid, usually air, at another temperature as the fluid flowed over the exterior. Heat may transfer in either direction as out or into the working fluid in the exchanger. This application removed heat. The client provided optimistic design specifications that included excessive operational ranges for airflow and internal working fluid flow as well as thermal cycling and cycle time. The spec was coupled to excessive temperature and pressure ranges for the internal working fluid and the tunnel airflow. High relative humidity from the outside air also affected the tunnel's ability to cont...