Our basic aim was to develop a low-cost diagnostic system in connection with VSR, which is based on the acoustic response of the workpiece. During the development it was also very important, that the full system can be used in industrial environment, and it can determine whether the part need to be treated, and with what kind of treatment should be applied. Firstly this means which frequency and how long. Another advantage is that this is a non-destructive testing methode, which can be used for a prediction for residual stress. For manufacturers, with this system residual stress can be decreased, and the number of rejects can be also reduced.
The measurement images developed by us with a unique acoustic spectrum recording are not only suitable for determining the natural frequencies of metal castings, but can also be deduced residual stress, which can cause deformation later. From the changes between the measurement images, the effect of different machining and even aging on the casting can be seen. Of couse it can be used for welded structures also. Furthermore, the required input frequency for vibration stress relief can be easily determined from the images. Some of the main advantages are the process obtained quickly, easily and immediately. In the years we have also developed a complete acoustic diagnostic system and a software with an online platform. Last but not least, this type of diagnostics is easy to implement in industrial work areas, even factories and foundries, as it does not require a large area, it is not energy and investment-intensive.