computer science

ROHR2

ROHR2 is a computer science 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 ROHR2 rather than just read about it. In short: ROHR2 is a CAE system for pipe stress analysis from SIGMA Ingenieurgesellschaft mbH, based in Unna, Germany. The software performs both static and dynamic analysis of complex piping and skeletal structures, and runs on Microsoft Windows platform.

Key takeaways

ROHR2 belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect ROHR2 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of ROHR2 from memory before moving on to harder problems.

Reference excerpt

ROHR2 is a CAE system for pipe stress analysis from SIGMA Ingenieurgesellschaft mbH, based in Unna, Germany. The software performs both static and dynamic analysis of complex piping and skeletal structures, and runs on Microsoft Windows platform. ROHR2 software comes with built-in industry standard stress codes; such as ASME B31.1, B31.3, B31.4, B31.5, B31.8, EN 13480, CODETI; along with several GRP pipe codes; as well as nuclear stress codes such as ASME Cl. 1-3, KTA 3201.2, KTA 3211.2.

Name The brand name comes from the German word "Rohr" (pronounced "ROAR") which means "pipe".

History

Early years as a MBP product: 1960's to 1989 ROHR2 was created in the late 1960s by one of the first software companies in Germany, Mathematischer Beratungs- und Programmierungsdienst (MBP), based in Dortmund. ROHR2 first ran on mainframes such as UNIVAC 1, CRAY, and later Prime computer. At the time, the program was command line driven with a proprietary programming language to describe the piping systems and define the various load conditions. The 1987 launched version 26 was released for IBM PC and IBM PC compatible systems.

As a EDS / SIGMA product: 1989 to 2000 MBP was later taken over by EDS (then a part of General Motors Corp., now part of HP Enterprise Services). In 1989, SIGMA Ingenieurgesellschaft mbH was founded in Dortmund, and the ROHR2 development and support team moved to the new office premises of SIGMA. The graphical user interface was added in 1994 to the product, which allowed the editing of piping systems without the need of mastering the earlier required programming language.

Sigma Ingenieurgesellschaft mbH product: 2000 to present From the year 2000 onwards, the complete licensing and sales activities came under the management of SIGMA Ingenieurgesellschaft mbH; which by then evolved into an engineering company specializing in pipe engineering, as well as a software development firm. The recent developments include new bi-directional interfaces based on open standards for transfer of data with other CAD/CAE products such as AVEVA PDMS, CADISON, Intergraph's PDS, Intergraph's SmartPlant, HICAD, MPDS4, Bentley System's AutoPLANT, Autodesk's PLANT3D and other PCF supported software. The integration of ROHR2 into the users workflow is supported by third-party interface products to ensure interoperability - a norm in the present engineering software industry.

Software packages The ROHR2 program system comes with the graphical user interface ROHR2win, the calculation core ROHR2, and various additional programs, see section related products.

Calculation basics The static analysis includes the calculation of static loads of any value, or combination in accordance with the theories of first- and second order for linear and non-linear boundary conditions (friction, support lift). Additional load conditions can also be applied, such as dynamic loads or harmonic excitation. Furthermore, the dynamic analysis include the calculation of eigenvalues and mode shapes as well as their processing in various modal response methods - for the analysis of f.i. earthquakes and fluid hammer. A non-linear time history module (ROHR2stoss) allows the analysis of dynamic events in the time domain, while taking into account non-linear components such as snubbers or visco dampers based on the Maxwell model. An efficient superposition module enables a manifold selection and combination of static and dynamic results.

Related products ROHR2fesu - Finite element analysis of substructures in ROHR2 ROHR2iso - Creation of isometric drawings in ROHR2 ROHR2stoss - Structural analysis with dynamic loads using direct integration ROHR2nozzle - Analysis of nozzles in piping systems according to API 610, 617, 661, NEMA SM23, DIN EN ISO 5199, 9905, 10437 and others ROHR2press - Internal pressure analysis of piping components SINETZ - Steady state calculation of flow distribution, pressure drop and heat loss in branched and intermeshed piping networks for compressible and incompressible media SINETZfluid - Calculation of flow distribution and pressure drop of incompressible media in branched and intermeshed piping networks PROBAD - Code-based strength calculations of pressure parts

Worked examples

Example 1 — a first encounter with ROHR2

Start with the simplest possible case. Write down what ROHR2 claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, 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 ROHR2 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 ROHR2 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 ROHR2

In research: ROHR2 appears in computer science 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 ROHR2 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: ROHR2 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Computer-aided design, Computer-aided design software for Windows, Structural analysis, so understanding it makes those chapters shorter.
In everyday life: Look for ROHR2 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 ROHR2 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what ROHR2 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 ROHR2 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is ROHR2 in simple terms?

Why does ROHR2 matter?

Because it connects several computer science 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 ROHR2?

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 ROHR2.