Ventana software support forum

Esteemed SDists: I should make some clarification notes on my last post. The revelation I had was articulated to me by the IT staff with whom I was working as a part of the Applications System Dynamics course at MIT. They were trying to brief a new senior executive in their company and thats the res...

Esteemed SDists: I recently observed that SD has an academic smell that drives away senior executives. It was my first SD consulting experience in which I worked with the companys IT staff. My clients, the IT people, are optimistic for the success of SD or ST in resolving some operational glitches i...

Greetings, I have been thinking about several modeling issues such as the so-called conservation principles. In engineering, we (engineers) apply conservation of mass, momentum and energy. While it is obvious that matter (representing mass) and resources (representing energy) are conserved in modeli...

References: (0269 and 0268) Ed (0269) wrote: "The engineer is generally designing and building a new system." Not always! What you described is one paradigm in R&D. Many process control engineers have to "fix" processes that had been designed by other people. This is one main...

References: (0272, 0273) Paul (0268) wrote: "... anything is gained by looking at it at [behavioral] level when the molecular level explains the phenomenon perfectly." Understanding of the physics or interactions is the most important element in explaining any phenomenon perfectly. However...

WRT (SD0262) Please let me clarify the point I made earlier without distracting people from the focus of this group and system dynamics in general. > The feedback loop structure of > the coffee cooling and a thermostatically controlled environment are > identical (both negative loops). The only diff...

IRT SD0261 > In his 1948 control theory text, Gordon Brown (Jays mentor, and so in > some sense ours as well) wrote: "A closed-loop control system is thus an > error-sensitive system and, being such, it acquires certain pecularities > and idiosyncrasis which, in large measure, are the reasons f...

WRT (SD0252) and (SD0254) According to John Sterman: > The feedback loops in the example of a dead body or cup of coffee > cooling towards the ambient temperature are straightforward: > The temperature of the body or coffee affects the rate at which heat is > transferred from the body to the externa...

Here is a control engineers perspective: o Feedback is used when one is comparing "outputs" of a system to their desired values. The comparison is used as a basis to generate a corrective action that will drive the system to its target state. The terminology is due to the use of "info...

Greetings, In my engineering training as a manufacturing process control engineer, discrete and continuous simulations are done with some purpose in mind. The fundamental use of simulations is a tool to design a controller. Many times we build electronics controllers that in principle operate contin...