# New Semester

Hi! This semester at the TU Berlin, I’ll help teach the course “Numerical simulation techniques in engineering” or in its original German title - “Numerische Simulationsverfahren im Ingenieurwesen”. It’s a fascinating topic, you should come!

Here’s the course website with all the necessary information.

In the video you can see a simulation of a viscous flow (example here: lid-driven cavity flow), something of this sort will be easy for you to program after you heard the course.

# New paper published

Hi! A new paper was just published:

Stiff and soft active control of friction by vibrations and their energy efficiency
J. Benad, M. Popov, K. Nakano, V. L. Popov
Forschung im Ingenieurwesen, pp. 1-9, 2018

The work builds upon the results of two recent studies on the influence of friction by normal and sideways oscillations. The findings are rewritten to a more compact and dimensionless form and the results for both oscillation modes are presented side by side in a consistent manner. It is shown that the macroscopic coefficient of friction is only a function of a dimensionless sliding velocity and a dimensionless oscillation amplitude for the considered model. Also, the energy efficiency is characterized for both oscillation modes for the first time by comparing the total energy which includes the superimposed oscillations with the energy needed for the motion without the additional oscillations.

Hi!

Robots which climb walls as easily as geckos, extremely strong glue, advanced medical tape, cell mechanics - adhesion is everywhere and unlocking its secrets leads to amazing new technology!

Below you'll find a link to what I believe is a great paper on the topic of adhesion (open access). For instance, if you ever wondered how the adhesive force actually depends on the shape of the contact, this paper has the answers!

V. Popov, R. Pohrt, Q. Li -
Friction 5(3): 308–325 (2017).

# Self-balancing robots

Hi! Here are a few links which may be useful if you want to get started building self-balancing robots! I found that with the components below it's easy to achieve some nice results very quickly (<5h)!

I used the Arduino 101 to control the robot. It's quite amazing because you get the 6-axis accelerometer and gyro directly on the board. Everything you need to use the sensors in your code is very well-documented here.

Now all which is left are two motors, a motor shield, a battery, wheels and a frame. You could use the da Vinci Mini 3D printer to build the frame.

Here's a video and a few pictures:

Many thanks to A. Holtkämper for designing and printing the frame!

Let me know what you think or if you have any questions!

# Flying V Update

Hi! I just updated the page of the Flying V aircraft configuration on this website. Have a look!

# New Semester

Hello,

this semester I'm helping with the course Simulation of Tribological Contacts at the TU Berlin. Time and location of the lecture:

### Wed:  16:15 - 17:45   /   M 123

It's a fascinating topic, you should come! Cheers, Justus.

# New Photos

Hi everyone,

I just added some new images to my photo gallery. You can view them here!

Justus

# The Flying V wins the Young Researcher Competition of the Royal Aeronautical Society

Hi,

yesterday the Flying V won in its category the Young Researcher Competition 2015 of the Royal Aeronautical Society.

Justus

The ceremony was held by BBC reporter Stephanie McGovern (1st f. l.), RAeS President Martin Broadhurst (2nd f. l.), Director for Environmental Research at the European Commission Manuela Soares (6th f. l.) and Secretary General of the Aerospace and Defense Industries Association of Europe Jan Pie (7th f. l.).

# Investigation of a hydrofoil control system

Hi,

today a new investigation of a mechanical lift control system on hydrofoil boats was finished. Click here to find out more.

Cheers,
Justus

# New Semester

Hi,

this semester I'll give seminars for the courses Energy Principles in Mechanics and
Continuum Mechanics at the TU Berlin. Times and locations:

### Thu:  12:15 - 13:45   /   EB    407

Individual help and tutoring:

Cheers,
Justus

# Airbus files a patent for the "Flying V" aircraft configuration

Hi,

last week the German Patent and Trade Mark Office (DPMA) released a patent application for the Flying V aircraft configuration. It was filed by the aircraft manufacturer Airbus.

Cheers,
Justus

Source: www.dpma.de, DE102014201040A1

# Sentient Blue

Hello!

Check out the website of Sentient Blue. It's a startup company which will compete in the Little Cup, the C Class Sailboat World Championship, in September 2015. Over the next months I'll start to help with a bit of work on some of the company's future projects.

For more information on the upcoming race check out the official Little Cup webpage. The event can also be found on this website.

Justus!

Paul Larsen and Helena Darvelid from Sailrocket together with Oscar Lindley-Smith at Sentient Blue's base in Abu Dhabi.

# New Semester

Hi,

this semester I'll give seminars for the course Kinematics and Dynamics at the TU Berlin. Times and locations:

### Tue:  10:15 - 11:45   /   M  128

Individual help and tutoring:

Cheers,
Justus

# First presentation of the Flying V

Hi everyone!

Here's a video of the presentation of the Flying V aircraft configuration at the Technical University of Berlin:

The video highlights of the presentation (including all flight videos) can be watched in this video:

You can find out more about the configuration on this website

Cheers,
Justus

# New album: Melodies

Hi there! Here you can listen to and download my new piano album.

Justus!

# Trailer - new aircraft configuration

Hello!

On February 4 at 4pm I'll present a new aircraft configuration at the TU Berlin!

Here's a short trailer (available on Vimeo and Youtube):