Allowable Unbalance Calculator
The calculation of allowable unbalance is a critical step in rotor balancing. It provides the benchmark against which the success of the balancing activity is measured. After balancing, the residual unbalance (the unbalance left in the rotor) must be less than the allowable unbalance level defined by ISO 1940 standard. ✅ If the residual unbalance […]
Trial Mass Calculator
As per Victor Wowk / Crawford, the trial mass added to the rotor must create a force equivalent to 10% of the rotor weight, which means It should be large enough to produce a measurable vibration change of 30% and/or phase change of 30 degree. small enough to avoid overstressing the rotor or introducing excessive […]
Phase relationship between D-V-A
The purpose of this post is to offer some fundamental clarity on the Phase relationship between Displacement-Velocity-Acceleration. There are many ways to explain this relationship like using pendulum, or from the waveform by indicating the time difference between the peaks. In this post, only the mathematical explanation is provided. Let’s consider a sinusoidal (single discrete […]
Relationship between Heavy spot, High spot and Vibration vectors
There are lot of confusions roaming around “High spot” and its relationship with vibration vectors (D-V-A). The purpose of this article is to shed some light on this topic. The image shown below will be referred throughout this text. Many don’t have any second opinion about Heavy spot – It is the angular location of […]