DIN4150-3 is the German standard for vibration.
DIN4150-3 is to regulate the vibration impact on structures, on X-axis we have the frequency and the Y-axis the Peak Per Velocity (PPV).
Type 1 , Type2 , Type 3 are the types of structures with Type 1 being the least sensible to vibration and Type 3 being the most sensible vibration.