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ARAMIS – From 3D Measuring Data to Vibration Types
February 22, 2019
Category: News
The article below is from GOM website.
Calculation models show the type of vibration of parts. Measurements are carried out to help to understand which types of vibration are formed during operation of the part. GOM offers the sensor system for carrying out these measurements.
The ARAMIS 3D sensor is a stereo camera system and provides accurate 3D coordinates using the triangulation principle. The sensor measures 3D coordinates dynamically and provides measuring results such as strains, 3D displacements and 3D deformations. The 3D displacements captured with a high temporal resolution are used for the vibration analysis. The optical metrology offers many advantages for the vibration analysis such as:
- Non-contact measuring principle
- No wiring of accelerometers required
- Fast setup and calibration of the sensor
- Compact dimensions of the sensors
- Ultra-light and lasting measurement targets
- Synchronous measurement of many points in 3D – thus points can be measured also unsteadily
- 3D displacement results for each measuring point
Depending on the application, measurements on the part are carried out in a point-based or full-field manner. To specify the type of vibration with the ARAMIS sensor, the excitation of the parts can be different. A simple harmonic excitation, an impact test or a rotating part during operation can be measured. The frame rate depends on the excitation. The ARAMIS SRX system of the ARAMIS sensor family has a maximum image recording rate of 335 Hz with a 12-megapixel resolution. In addition, by reducing the image height, the image recording rate can be increased up to 2000 Hz.
From the captured image data, surface components or point components are created. These components are inspected for 3D displacements over time.
Read more -> Here
Precision to Aircraft De-icing
February 8, 2019
Category: News
The article below is from Vaisala
Snow,Freezing rain – it doesn’t take much of an imagination to picture how these and other wintry weather phenomena can make a pilot’s job harder by reducing visibility. But the same phenomena can also cause problems just by coming into contact with the aircraft.
The problem is that ice build-up on an aircraft changes its aerodynamics. This is why planes often need to be de-iced and then anti-iced during the winter to ensure safe take-offs. However, anti-icing fluids only provide protection against these weather phenomena for a limited period of time, known as holdover time, after which aircraft have to be treated again.
In practice, this means that to ensure the safety of the aircraft and its passengers as well as to avoid delays, the aircraft needs to be able to take-off before the anti-icing effect wears off. Therefore, being able to optimize the type and concentration of anti-icing fluids is crucial to ensure timely take-offs at busy airports without using excessive anti-icing fluids that are both more costly for airlines and detrimental to the environment.
Conventionally deciding whether a plane needs de-icing involves assessing the situation based on prevailing weather conditions and visual inspection of the plane. Vaisala has developed a more scientific approach in the form of a system that calculates checktimes for different types of anti-icing fluids based upon more accurate weather observations and algorithms.
The system gathers data from a weather station consisting of multiple weather sensors installed at the airport to determine the parameters needed to calculate the checktime, such as liquid water equivalent, present weather, air temperature and wind. The data is then fed to a data center, which processes the information, calculates the checktimes, and relays the information to pilots, de-icing coordinators and airline dispatchers. Rather than providing a range like traditional holdover time tables, the Vaisala system is able to generate a precise checktime, after which it is no longer safe to take off without reapplying the de-icing and anti-icing fluids.
After working with airlines in North America, Europe, and the Middle East, the results have shown that CheckTime helps to optimize the use of anti-incing fluids, leading to lower costs and more efficient airline operations without compromising the most important thing – safety. The system also reduced the environmental impact of anti-icing by eliminating the use of unnecessary fluids.