effort flow integration

Introduction toEngineering Science Wellesley CollegeSpring 2007Prof. Gill Pratt, Prof. Brian StoreyF.W. Olin College of EngineeringProf Ted Ducas, Wellesley College: 

Introduction to Engineering Science Wellesley College Spring 2007 Prof. Gill Pratt, Prof. Brian Storey F.W. Olin College of Engineering Prof Ted Ducas, Wellesley College Course Introduction Effort and Flow Time Integration

What This Course is All AboutFour Central Ideas of Engineering: 

What This Course is All About Four Central Ideas of Engineering The Dual Variables of Effort and Flow how power flows between interacting objects, regardless of their domain (e.g. Electrical, Mechanical, Thermal, Biological, etc…). State how systems remember the past, and which results from the time integration and storage of energy. Transduction the bidirectional transformation of effort and flow from one domain to another. Feedback used in almost all engineered devices to bring about desired behavior despite undesired disturbances.

Course Details: 

Course Details Course Name: Extradepartmental 160: Introduction to Engineering Science First Class: Yes, we have a site, but we are novices, so: Site points to http://wb.olin.edu/ies Local Server for Lab Software, etc … From “My Computer” type: \\sci-e225-08 Map the “student” share to drive S: From then on, just use drive S: Let’s take a look at http://wb.olin.edu/ies ...

What This Course is All AboutFour Central Ideas of Engineering: 

What This Course is All About Four Central Ideas of Engineering The Dual Variables of Effort and Flow how power flows between interacting objects, regardless of their domain (e.g. Electrical, Mechanical, Thermal, Biological, etc…). State how systems remember the past, and which results from the time integration and storage of energy. Transduction the bidirectional transformation of effort and flow from one domain to another. Feedback used in almost all engineered devices to bring about desired behavior despite undesired disturbances.

What You Will Build: 

What You Will Build Phase 1: A Water Clock Out of some Nalgene Bottles and tubing Instrumentation through computer Phase 2: A Hot-Wire Anemometer Out of a crushed light bulb Control and instrumentation through computer Phase 3: An Electro-Mechanical Clock Out of a Lego motor and wheel Virtual spring and escapement through computer Phase 4: A Mechanical Clock Out of Wood or Plastic Designed with SolidWorks, Using the Laser Cutter Through All Phases: Modeling & Experiment in Parallel Using Matlab / Simulink

Effort and FlowAcross and Through: 

Effort and Flow Across and Through Effort (Across) Flow (Through)

Some Effort and Flow Analogs: 

Some Effort and Flow Analogs

Resistance: 

Resistance

Electrical Resistance: 

Electrical Resistance

Power: 

Power Unit Check

Electrical Power: 

Electrical Power

Which Causes Which?: 

Effort Flow Effort Causes Flow Flow Causes Effort Which Causes Which?

Today’s Lab:: 

Today’s Lab: You have a WONDERFUL device connected to your computer. It can: Supply Voltage, Measure Current Or Supply Current, Measure Voltage It can do this 2500 times per second!

Today’s Lab:: 

Today’s Lab: Connected to this device is a circuit board with two long metal surfaces separated by an insulator. If you put the circuit board in water, impurities in the water will conduct electricity between the metal surfaces If you measure the conductivity, you can measure the height of the water!

Today’s Lab:: 

Today’s Lab: But: We can’t pass electricity through the water in one direction, as this will electroplate metal from one electrode surface onto the other. Solution : We’ll use alternating current: The conductivity is not exactly proportional to water height.

Today’s Lab:: 

Today’s Lab: But: We can’t pass electricity through the water in one direction, as this will electroplate metal from one electrode surface onto the other. Solution : We’ll use alternating current. The conductivity is not exactly proportional to water height.

Today’s Lab:: 

Today’s Lab: You’re task, should you accept it: Run a series of experiments with water at different heights. Record the conductivity measured by the system. Fit a curve to the data

Thursday’s lab:: 

Thursday’s lab: Using your calibration curve from today, investigate the dynamics of water draining out of the bottle under different conditions Through a hole Through a short tube Through a long tube Construct a Simulink model that fits the dynamics you observe. Why do this? The dynamics of these first order systems underlies the operation of almost every engineering system (and a great many things in nature too!).