Xodus Group applies expert knowledge and measurement techniques to maximise reliability, minimise unscheduled downtime and assure continuous and safe operation.
Xodus’ vibration engineering team uses specialist measurement techniques and calculations to quantify potential vibration problems and identify the root causes of unwanted vibration. Our practical and cost-effective solutions help operators reduce the time between failures and avoid catastrophic breakdowns.
Turbo machinery and rotor dynamics analysis
Turbo machinery vibration analysis is performed in order to pinpoint and avoid potential failures. We combine shaft vibration analysis techniques, including vibration measurement, phase detection, order tracking, shaft orbits and centreline measurement, with time and frequency analysis to determine the root causes of vibration. Slow roll compensation techniques are also applied to determine mechanical or electrical run out in most proximity probe monitoring systems.
Our rotating machinery specialists study the entire system, employing structural and rotor vibration analysis techniques to measure the shaft, supporting structure and machine casing (bearing housing) to understand how the rotor and structure behaves under vibratory forces. Wherever possible, recordings of process parameters such as pressure, temperature, flow, valve positions and control signals are made to form a complete picture of the system.
To support field measurements, Xodus Group offers analytical studies in Finite Element Analyses (FEA), Computational Fluid Dynamics (CFD) and rotordynamics (critical speeds, instability). These studies can be applied proactively to avoid foreseen problems or reactively to investigate observed dynamic problems.
Modal analysis and operating deflection shape
Diagnosing rotating machinery vibration problems occasionally requires structural vibration investigation in the form of Operating Deflection Shape (ODS) analysis or modal analysis. Xodus uses both techniques for in-depth analysis of a machine’s structure and behaviour under vibratory forces.
ODS shows the actual deflection shape at which the structure or machine is vibrating, at a specific frequency. The technique highlights the response of a structure to both resonant vibration and vibration due to forces from the rotating elements, and is generally representative of the real world data. ODS evaluation can be particularly useful in the analysis of rotating machinery where internally generated forces can be high.
Modal analysis is similar to ODS in that mode shapes of the structure and how they are deforming can be viewed, but it is primarily concerned with natural frequencies and potential resonance of a structure. It is typically performed with a shaker (for known frequencies) or an impact hammer (to excite all frequencies) by exciting the structure and measuring the response at various locations using vibration sensors. The measured Frequency Response Functions (FRF) are analysed to determine the modal parameters (e.g. structural damping).
Factory and site acceptance services
Factory Acceptance Testing (FAT) of industrial rotating machines often requires complete and accurate documentation of vibration characteristics including measurements for shaft and housing vibration. In the field, in-service machinery may also require Site Acceptance Testing (SAT). Xodus can provide FAT and SAT documentation (acceptance certificates) employing vibration analysis technology. FAT and SAT testing may require additional services such as balancing or trouble shooting investigation which our specialists can provide when required. If a delivery does not fulfil the written dynamic requirements Xodus can act as a mediator between the end user and the manufacturer to speed up corrective actions.
Piping vibration analysis
Piping vibration can cause serious problems leading to fatigue in flanges, supports, and Small Bore Connections (SBC). Acoustic Induced Vibration (AIV) and Flow Induced Vibration (FIV) in process facilities are major causes of pipe work and SBC failures. Our vibration engineering team’s detailed knowledge and experience in pipe work vibration analysis and risk assessment includes developing and using the Energy Institute (EI) guidelines. Our engineers are experts in identifying potential problem areas and providing solutions, including the design of support braces, dampers and new main line supports, to reduce the risk of failures. This, in combination with our machinery vibration analysis capability, creates a strong team with a proven track record in identifying, quantifying and managing vibration related plant problems.
Training provided by Xodus is all about delivering competence – the combination of knowledge, practical experience, motivation, attitude and behaviour which gives your personnel the ability and motivation to maintain and improve performance of the individual and operation. Our vibration analysis training complies with ISO 18436 which defines the requirements for training and certification of personnel in non-intrusive machine vibration condition monitoring and diagnostics.
- Rotor dynamic analysis
- Rotor balancing.