engineering

Lennart Ljung (engineer)

Lennart Ljung (engineer) is a engineering topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Lennart Ljung (engineer) rather than just read about it. In short: Lennart Ljung is a Swedish professor in the Chair of Control Theory at Linköping University 1976–2011, after which he continued as professor emeritus. He is known for his pioneering research in system identification, and is regarded as a leading researcher in control theory.

Key takeaways

Lennart Ljung (engineer) belongs to engineering; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Lennart Ljung (engineer) to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Lennart Ljung (engineer) from memory before moving on to harder problems.

Reference excerpt

Lennart Ljung is a Swedish professor in the Chair of Control Theory at Linköping University 1976–2011, after which he continued as professor emeritus. He is known for his pioneering research in system identification, and is regarded as a leading researcher in control theory.

Education Lennart Ljung received the B.A. in Russian Language and Mathematics 1967, the M.Sc. (first degree) in Engineering Physics 1970, and the Ph.D. in Control Theory 1974, all from Lund University.

Background, Present Appointments and Scientific Contributions Following a position as a research associate at Stanford University 1974–1975 and a position as an associate professor (docent) in control theory at Lund University in 1975–1976, Lennart Ljung was elected as a professor in the chair of control theory at Linköping University in 1976. He was a visiting researcher at Stanford University 1980–1981 and at Massachusetts Institute of Technology 1985–1986. He was also Department Head of the Department of Electrical Engineering, Linköping University between 1981 and 1990. He is currently the Director of the MOVIII Strategic Research Center at Linköping University. He has made extensive contributions to control theory, particularly in the area of system identification. He has authored 10 books, over 150 international journal articles, over 200 international conference papers, and a widely used commercial software package for MATLAB called the System Identification Toolbox. Lennart Ljung is ranked 84 in the world (1st within Sweden) in the field of Engineering and Technology.

Notable honors and awards IEEE Fellow (1985) Member of the Royal Swedish Academy of Engineering Sciences (1985) Member of the Swedish Academy of Sciences (1995) Doctor honoris causa Baltic State Technical University (1996) Doctor honoris causa Uppsala University (1998) Honorary Member of the Hungarian Academy of Engineering Sciences (2001) Giorgio Quazza Medal (2002) Hendrik W. Bode Lecture Prize, awarded by IEEE Control Systems Society (2003) Foreign Associate of the United States National Academy of Engineering (2004) Doctor honoris causa Universite de Technologie de Troyes (2004) Doctor honoris causa Katholieke Universiteit Leuven (2004) IEEE Control Systems Award (2007) Doctor honoris causa Helsinki University of Technology (2008) Large Gold Medal of the Royal Swedish Academy of Engingeering Sciences (2018)

See also System Identification Control Theory Electrical Engineering

References

External links Lennart Ljung's personal web page MOVIII Strategic Research Center at Linköping University System Identification Toolbox Product page at MathWorks

Worked examples

Example 1 — a first encounter with Lennart Ljung (engineer)

Start with the simplest possible case. Write down what Lennart Ljung (engineer) claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In engineering, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Lennart Ljung (engineer) before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Lennart Ljung (engineer) ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Lennart Ljung (engineer)

In research: Lennart Ljung (engineer) appears in engineering research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Lennart Ljung (engineer) in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Lennart Ljung (engineer) is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1946 births, 20th-century Swedish engineers, 21st-century Swedish engineers, so understanding it makes those chapters shorter.
In everyday life: Look for Lennart Ljung (engineer) outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Lennart Ljung (engineer) in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Lennart Ljung (engineer) means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Lennart Ljung (engineer) out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Lennart Ljung (engineer) in simple terms?

Why does Lennart Ljung (engineer) matter?

Because it connects several engineering ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Lennart Ljung (engineer)?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Lennart Ljung (engineer).