Articles

Blogging with Quarto

I’ve recently started using Quarto, which is a new open source project backed by RStudio. Quarto is a system for producing reports, presentations, books and blog posts. It takes text formatted with markdown and code written in Python or R and produces PDFs, HTML or several other formats that …

➟ Read more

Shear of Adhesive Bonded Joints

There are a lot of misconceptions about bonded joints. One of the misconceptions that I’ve seen most often is that people think that the average shear stress in a lap joint is predictive of the strength. This same misconception is usually phrased as either:

  • Doubling the overlap length of …
➟ Read more

Violin Bow Stiffness

I’ve made a few violin bows and a couple cello bows. I’m very much a novice bow maker, but I’m learning. As I’m an engineer, I’m naturally trying to apply engineering principles to bow making, which isn’t necessarily easy since violin bows are actually …

➟ Read more

Speeding up Quadrature

Up until recently, I hadn’t really thought about the way that numerical integration was performed. Sure, I knew about some techniques like using the trapezoid rule to perform numerical integration, and without thinking about it too much, I had just assumed that the integration routines like R’s integrate …

➟ Read more

Long-Running Vignettes for R Packages

I’m going to release a new version of cmstatr soon. This new version includes, amongst other things, a new vignette. In R packages, a vignette is a type of long-form documentation. This particular vignette includes a simulation study that helps to demonstrate the validity of a particular statistical method …

➟ Read more

Calculating Extended Hanson—Koopmans Tolerance Limits

Calculating tolerance limits — such as A-Basis and B-Basis is an important part of developing and certifying composite structure for aircraft. When the data doesn’t fit a convenient parametric distribution like a Normal or Weibull distribution, one often resorts to non-parametric methods. Several non-parametric methods exist for determining tolerance limits …

➟ Read more


Basis Values Using a Likelihood Approach

All materials have some variability in their strength: some pieces of a given material are stronger than others. The design standards for civil aircraft mandate that one must account for this material variability. This is done by setting appropriate material allowables such that either \(90\%\) or \(99\%\) of the material …

➟ Read more



Pandoc Report Templates

The main benefit of using Notebooks (R Notebooks or Jupyter Notebooks) is that the document is reproducible: the reader knows exactly how the results of the analysis were obtained. I wrote about the use of Notebooks in an earlier post.

Most organizations have a certain report format: a certain cover …

➟ Read more

Package Adequacy for Engineering Calculations

If you do engineering calculations or analysis using a language like R or Python, chances are that you’re going to use some packages. Packages are collections of code that someone else has written that you can use in your code. For example, if you need to solve a system …

➟ Read more

Automating Software Validation Reports

I’ve been working on a Python package to analyze adhesively bonded joints recently. This package will be used to analyze adhesive joints in certain aircraft structure and will be used to substantiate the design of structural repairs, amongst other uses. Because of this, the output of this package needs …

➟ Read more

Reproducibility of Engineering Calculations

Reproducibility in engineering work doesn’t seem to get the attention that it deserves. I can’t count the number of times that I’ve read an old engineering report in search of a particular result, only to find that the calculation that lead to that result is only barely …

➟ Read more

rde: Now on CRAN

For the last couple of years, we’ve been using the statistical programming language R when we do statistical analysis or data visualizations at work. We typically deal with small data — most of the time, our data sets are high-tens or low-hundreds of rows of data.

A lot of the …

➟ Read more

Welcome to Kloppenborg.ca

Welcome to kloppenborg.ca

I plan to use this website as a blog where I discuss topics related to engineering, technology and whatever else I’m thinking about at the time.

If you find any of the posts here interesting, feel free to share them. If you don’t feel …

➟ Read more