Skip to content

Engineering practice guide

Engineering Simulations for Students

Learn to use browser engineering simulations for structures, controls, circuits, fluids, and design verification through a repeatable evidence workflow.

Browse engineering simulations →

Choose a structural, control, fluid, electrical, or mechanical engineering lab.

Start with the model

Concept overview

Engineering simulation is most valuable when it answers a defined question. A useful workflow starts with a requirement and measurable success criterion, identifies the governing model and assumptions, varies controlled inputs, and compares predictions with checks or evidence. Colourful output without a question, units, or validation is not an engineering result.

SciFunLab's engineering collection spans mechanics, structures, control systems, hydraulics, electronics, energy, and design. The labs are educational models, so the goal is to practise reasoning: identify inputs and outputs, check limiting cases, compare alternatives, and communicate uncertainty. They do not replace certified analysis, physical testing, manufacturer data, or professional review for safety-critical decisions.

Concept 1

Requirements before models

State what the system must do, under which conditions, and how success will be measured. The requirement determines which outputs and fidelity matter.

Concept 2

Verification and validation

Verification asks whether the model was implemented as intended; validation asks whether it represents the real system well enough for the intended decision.

Concept 3

Trade studies

Change one design variable or compare defined alternatives against the same criteria. Include units, constraints, uncertainty, and sensitivity instead of reporting one optimum as absolute truth.

Guided investigation

Run a small engineering trade study

  1. 1Choose one engineering lab and write a one-sentence requirement with a numerical success criterion.
  2. 2Record the baseline inputs, outputs, units, and assumptions before changing anything.
  3. 3Compare at least three design alternatives while holding the evaluation criterion constant.
  4. 4Check one limiting case or independent calculation and recommend an option with one explicit caveat.

Evidence to record

Produce a compact trade table with alternative, changed input, key output, constraint status, and evidence note. End with a recommendation tied directly to the requirement.

Equations and variables

error (%) = |model - reference| / |reference| x 100

A simple comparison metric when a nonzero trusted reference value exists.

  • • model: simulated value
  • • reference: independent measured or calculated value
  • • error: absolute relative difference in percent

margin = allowable - predicted

A simple requirement margin when lower predicted response is better.

  • • allowable: requirement limit
  • • predicted: model result
  • • margin: remaining difference under the stated convention

Worked example

Apply the model

A design has a predicted stress of 120 MPa and an allowable stress of 180 MPa. Find the simple margin and factor against the predicted value.

  1. Step 1: Margin = 180 - 120 = 60 MPa.
  2. Step 2: Allowable-to-predicted ratio = 180/120 = 1.5.

Answer: The arithmetic margin is 60 MPa and the ratio is 1.5 for this single load case. A real design decision still needs load combinations, uncertainty, failure mode, code, and material evidence.

Misconceptions to test

Common claim

“A more detailed model is always a better model.”

Correction: Extra fidelity adds cost and more uncertain inputs. The best model is sufficiently credible for the question and decision, with assumptions made explicit.

Common claim

“Matching one expected result proves the whole simulation is valid.”

Correction: One comparison is useful evidence, but credibility also needs broader checks, relevant data, sensitivity analysis, and clearly bounded use.

Teacher-ready worksheet

Engineering simulation trade-study sheet

  1. 1.Write one measurable requirement and its units.
  2. 2.List model assumptions and at least one excluded effect.
  3. 3.Record three alternatives in a shared trade table.
  4. 4.Perform one independent or limiting-case check.
  5. 5.Make a recommendation with evidence, uncertainty, and next test.

Print or save this page as PDF to use the investigation and worksheet offline.

Knowledge check

Check your understanding

Check requirements, assumptions, verification, validation, and margins.

Take the engineering evidence knowledge check →

Continue learning