Vibration Amplification in the Field
Real measurements. Real machines. Real findings — identified on-site, without stopping production, in minutes. Here is what VibraVizja® revealed in Poland.
Refiner Pipe Vibration & Bridle Fatigue — Pulp & Paper Plant
Context
A pulp and paper facility was experiencing repeated mechanical failures on the process piping attached to a disc refiner — a high-power rotating machine used to mechanically defibrate pulp slurry under pressure. The refiner was inducing significant vibration into the connected process pipework, progressively weakening the pipe bridles and hanger supports.
Conventional inspection and vibration route measurements had confirmed elevated vibration levels on the pipework, but had not identified the mechanism or the distribution of the dynamic loading across the system.
Measurement
A VibraVizja® measurement was performed on the refiner assembly and the attached process piping while the machine was running at full production load — no sensors, no shutdown, no modification to the process. The full-field measurement captured the operational deflection shape (ODS) of the complete pipe run simultaneously.
Findings
- The amplified video immediately revealed a global vibration mode of the piping system driven by the refiner's running speed — a large-amplitude, low-frequency oscillation propagating through the entire pipe run.
- The mode shape showed that the pipe bridles and hangers were being subjected to cyclic bending loads at specific nodes where the dynamic displacement was maximum — precisely the locations where fatigue failures had been occurring.
- The refiner itself showed no mechanical fault. The root cause was structural: the original pipe support layout had left sections of the pipework insufficiently restrained.
Design-phase deficiency in the pipe support and bridle arrangement. The process piping lacked sufficient dynamic restraint at the critical locations where refiner-induced vibration was being amplified by the pipe span geometry. VibraVizja® made the vibration mode visible across the entire system in a single measurement, enabling the engineering team to identify exactly which supports needed reinforcement. The structure was reinforced accordingly — and recurring bridle failures ceased.
A deep dive into the four root causes of piping vibration failure — mechanical excitation, hydraulic pulsation, pipe strain and support resonance — and how vibration amplification makes each visible.
How catching pipe support design deficiencies at commissioning — before handover — prevents exactly the kind of recurring structural failures seen in this case study.
Rotating Seal Premature Wear — Food Processing Plant
Context
A major food processing facility in south-west Poland was experiencing accelerated wear on a rotating seal in one of their production machines. The seal was failing significantly ahead of its expected service life, generating repeated unplanned interventions and associated production losses.
Measurement
A VibraVizja® measurement was performed on the machine while running at full production load — no sensors, no shutdown, no modification. Two measurement configurations were used: a full-field view of the rotating assembly, followed by a focused measurement on the support bracket.
Findings
- The amplified video clearly revealed an imbalance signature at 1× running speed across the rotating assembly — visible as a characteristic orbital motion of the shaft.
- When the camera was focused on the support bracket, the amplified footage showed excessive dynamic deflection of the bracket under operational load — a level of structural compliance inconsistent with the design intent.
- The frequency content of the bracket deflection was correlated with the machine running speed, confirming that the structural response was being driven by the rotating imbalance force.
Insufficient stiffness of the support bracket. The bracket's dynamic compliance under operating loads was generating cyclic displacement of the rotating assembly, producing the eccentric loading responsible for the premature seal wear. The maintenance team corrected the bracket on-site.
Structural Resonance Analysis — Industrial Engine Support Structure
Context
A manufacturing facility required a structural vibration assessment of the metal support structure holding an industrial engine in operation. The objective was to map the distribution of vibration between the engine and its supporting structure, and to identify any abnormal amplification or transmission that could threaten structural integrity or accelerate equipment wear.
The risks motivating the assessment included mechanical fatigue of the structure, gradual loosening of fastener connections under dynamic load, and premature wear of the engine and associated rotating equipment.
Measurement
VibraVizja® was used to capture the full-field operational deflection shape (ODS) of the engine support structure under normal operating conditions — engine running at full load, no modifications, no sensors attached.
Findings
- The amplified video revealed abnormal vibration amplification at specific locations on the support structure, disproportionate to the engine excitation level.
- The spatial distribution of the amplified motion was consistent with a structural resonance condition — a natural frequency of the support structure being excited by the engine's running speed or one of its harmonics.
- The mode shape visible in the amplified footage clearly identified the sections of the structure experiencing the highest dynamic stress.
Structural resonance of the engine support frame, with a natural frequency coinciding with an excitation frequency of the engine under operating load. The amplified video provided the maintenance and structural engineering teams with a clear, visual map of the dynamic behaviour of the structure.
See What VibraVizja® Finds on Your Machines
We travel anywhere in Poland and run a live measurement on one of your assets while it is running at full load — no production stop, no sensors, nothing attached. We leave you with the amplified videos.
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