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astronomy

Jan D. Achenbach

Jan D. Achenbach is a astronomy 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 Jan D. Achenbach rather than just read about it. In short: Jan Drewes Achenbach (20 August 1935 – 22 August 2020) was a Dutch-American engineer who was on the faculty of Northwestern University from 1963 until his retirement. Biography Achenbach was born in Leeuwarden in the north of the Netherlands.

Jan D. Achenbach — main illustration
Jan D. Achenbach — illustration

Key takeaways

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

Reference excerpt

Jan Drewes Achenbach (20 August 1935 – 22 August 2020) was a Dutch-American engineer who was on the faculty of Northwestern University from 1963 until his retirement.

Biography Achenbach was born in Leeuwarden in the north of the Netherlands. He studied aeronautics at the Delft University of Technology, graduating with an M.Sc. in 1959. After this, he went to Stanford University, where he received his Ph.D. in 1962. After a year at Columbia University, he became an assistant professor at Northwestern University, where he spent over 50 years in the McCormick School of Engineering.

Research Achenbach has developed methods for flaw detection and characterization by using contact transducers, imaging techniques and laser-based ultrasonics. He has also developed methods for thin-layer characterization by acoustic microscopy. Work is both analytical and experimental in nature, with extensive cooperation with investigators from other universities and from industrial organizations on theoretical experimental projects. Work in fracture mechanics has been primarily on dynamic fracture. He also carried out research on structural acoustics and on the mechanical behavior of composite materials. Achenbach was the founding editor-in-chief of Wave Motion from the journal's establishment in 1979 until 2012.

Honors and awards

Awards 2012 – ASME Medal by the American Society of Mechanical Engineers 2010 – Theodore von Karman Medal by the American Society of Civil Engineers 2005 – National Medal of Science 2003 – National Medal of Technology 2001 – William Prager Medal by the Society of Engineering Science 1997 – Outstanding Service Award by the American Academy of Mechanics 1996 – McDonnell-Douglas Aerospace Model of Excellence Award by McDonnell-Douglas Aerospace 1992 – Timoshenko Medal by the American Society of Mechanical Engineers 1975 – Curtis W. McGraw Research Award by the American Society of Engineering Education

Memberships and fellowships Member of the National Academy of Sciences Member of the National Academy of Engineering Fellow of the American Academy of Arts and Sciences Honorary Member of the American Society of Mechanical Engineers Fellow of the American Association for the Advancement of Science (1994) Fellow of the Japan Society for the Promotion of Science Corresponding Member of the Royal Netherlands Academy of Arts and Sciences (1999) Fellow of the Acoustical Society of America Fellow of the American Academy of Mechanics

Books Achenbach, J. D. (2003). Reciprocity in elastodynamics. Cambridge University Press. ISBN 978-0-521-81734-9. ——; Gautesen, A. K.; McMaken, H. (1982). Ray methods for waves in elastic solids. Pitman Advanced Pub. Program. ISBN 0-273-08453-4. —— (1975). A theory of elasticity with microstructure for directionally reinforced composites. Springer. ISBN 978-3-211-81234-1. —— (1973). Wave propagation in elastic solids. North-Holland Series in Applied Mathematics and Mechanics. North-Holland. ISBN 0-7204-0325-1.

References

Footnotes

Other

External links Jan D. Achenbach at the Mathematics Genealogy Project "Jan D. Achenbach". Mechanical Engineering – Department directory. Northwestern University. Archived from the original on 20 July 2011. Retrieved 10 December 2010.

Illustrations

Jan D. Achenbach illustration

Worked examples

Example 1 — a first encounter with Jan D. Achenbach

Start with the simplest possible case. Write down what Jan D. Achenbach claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, 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 Jan D. Achenbach 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 Jan D. Achenbach 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 Jan D. Achenbach

In research
Jan D. Achenbach appears in astronomy 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 Jan D. Achenbach 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
Jan D. Achenbach is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1935 births, 2020 deaths, ASME Medal recipients, so understanding it makes those chapters shorter.
In everyday life
Look for Jan D. Achenbach 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 Jan D. Achenbach in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Jan D. Achenbach means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Jan D. Achenbach out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Jan D. Achenbach in simple terms?

Jan Drewes Achenbach (20 August 1935 – 22 August 2020) was a Dutch-American engineer who was on the faculty of Northwestern University from 1963 until his retirement. Biography Achenbach was born in Leeuwarden in the north of the Netherlands.

Why does Jan D. Achenbach matter?

Because it connects several astronomy 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 Jan D. Achenbach?

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 Jan D. Achenbach.

Tags

  • 1935 births
  • 2020 deaths
  • ASME Medal recipients
  • American scientists
  • Columbia University staff
  • Delft University of Technology alumni
  • Dutch acoustical engineers
  • Dutch emigrants to the United States
  • Fellows of the Acoustical Society of America
  • Fellows of the American Academy of Arts and Sciences
  • Members of the Royal Netherlands Academy of Arts and Sciences
  • Members of the United States National Academy of Engineering

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