Vibration & Structural Dynamics
We diagnose and resolve vibration, resonance and structural dynamics problems so machinery, structures and equipment meet acceptance limits, avoid fatigue damage, and operate reliably in real conditions — not just on paper.
When machinery repeatedly fails at operating speed, cracks reappear after repair, or pipework and frames shake under load, the issue is rarely “vibration levels” alone. The governing cause is typically structural resonance, unintended mode excitation, dynamic coupling, or cyclic stress acting through a weak load path.
Environmentally Sound Limited is an established, independent, chartered engineering-led consultancy providing end-to-end vibration and structural dynamics support across the UK and Europe: from diagnosis and on-site measurement through to engineered modifications, installation support and verification testing.
This is not measurement-only consultancy. We identify the mechanism causing the problem, engineer the modification required to remove it, and verify the improvement in operation.
How we help you (outcomes)
Reduce vibration and resonance to protect assets and extend fatigue life.
Meet OEM/client vibration limits and recognised criteria such as ISO 20816/10816, ISO 7919, API 619, MIL-STD-810, RTCA DO-160 and VC criteria.
Control structure-borne noise by addressing the vibration source, transmission paths and radiating surfaces.
Provide defensible evidence for customers, certifiers, regulators and internal design reviews.
Move from recurring vibration problems and repeated repair cycles to stable, predictable operation and improved MTBF.
What makes this different
Diagnosis before design: we determine whether the governing problem is resonance at operating speed, excitation of an unintended structural mode, insufficient stiffness, poor load-path distribution, dynamic coupling, or fatigue driven by cyclic stress.
Engineering modification — not just reporting: we develop practical changes that shift natural frequencies, redistribute stiffness, reduce stress concentrations and improve load paths so recurrence is eliminated.
End-to-end accountability: investigation, analysis, design, implementation support and verification — with before/after evidence suitable for internal sign-off.
Reliability-focused: solutions are aligned to improved stability, reduced maintenance burden and stronger mean time between failures.
What we do (buyer-intent services)
Piping and structural vibration: diagnose resonance, reduce amplification, manage stiffness, mass and boundary conditions, and reduce piping fatigue risk in pipework, supports and frames.
Machinery vibration: troubleshoot rotating machinery vibration including unbalance, misalignment, looseness, forcing functions, resonance interaction and coupled response into surrounding structures.
Field engineering & troubleshooting: rapid on-site measurement, clear root-cause conclusions, practical mitigation options, installation support and verification.
Rotating equipment reliability: engineering actions that reduce repeat failures, improve stability in service and support better MTBF.
Structure-borne noise management: reduce noise generated by vibrating structures and machines by removing the mechanical cause.
Engineering modification design & structural analysis: practical modifications to frames, supports, skids, joints, pipework and auxiliary systems so equipment operates outside problematic dynamic behaviour.
Our work includes rotating equipment, structural frames, skids, auxiliary systems and connected pipework. The tools we use — measurement systems, structural analysis software and numerical modelling — support the engineering process. They are not the product. The outcome is a mechanically robust system operating outside problematic dynamic behaviour.
Vibration performance & compliance
For many projects vibration is a compliance requirement, not a “nice to have”. We interpret and apply limits so your design or installation meets its criteria in practice.
Apply OEM and client vibration limits to real installations and operating modes.
Assess against relevant standards and criteria such as API, ISO 10816/20816, ISO 7919, VC criteria and project-specific specifications.
Engineer frames, supports, joints and isolation systems so machinery runs within its permitted vibration envelope.
Support design verification and qualification testing so equipment passes first time — reducing redesign loops and corrective-action spend.
Design it right first time
We apply vibration and dynamics expertise early, so compliance and performance are built in from the start — de-risking the project, improving confidence, and avoiding wasted investment in late-stage fixes.
Typical situations we are called into
Common symptoms
High vibration at particular speeds, loads or operating conditions.
Recurring cracking at a consistent speed band or during run-up and coast-down.
Repeated cracking of welds, brackets, supports, frames or pipework.
Loosened fasteners, leaking joints, failed seals and recurring maintenance issues.
“Ringing” or booming panels and housings producing structure-borne noise.
New equipment failing during testing, commissioning or early service life.
Failure to meet OEM acceptance criteria, customer requirements or test limits.
Repeated “measure and report” engagements with no permanent resolution.
What’s at risk
Safety & asset integrity: fatigue crack growth, bracket or shaft failures, bearing damage and structural degradation.
Business continuity: outages, forced derating, reduced throughput, increased maintenance burden and unstable operation.
Compliance & reputation: failure to meet customer, OEM or standard requirements, with recurrent complaints and escalation.
Our engineering process
Diagnose → Measure → Analyse → Engineer → Verify
1) Diagnose
Review failure history, inspection findings, maintenance records and symptoms.
Review drawings, specifications, previous calculations and prior reports.
Site walk-down to confirm layout, supports, boundary conditions and operating envelope.
Define the governing failure mechanism, the constraints and the success criteria — including reliability outcomes where relevant.
Confirm pass/fail targets using OEM requirements, customer criteria or standard-based limits.
2) Measure
We measure real behaviour so decisions are based on evidence:
Vibration levels at key locations and directions on machines, structures and pipework.
Rotational speeds, orders, 1X/2X components, gear mesh and characteristic frequencies.
Transient and steady-state behaviour during start-up, shutdown and critical operating points.
Only the data needed to determine the governing behaviour and the correct decision path.
Typical techniques include:
Multi-channel acquisition with tri-axial accelerometers, velocity sensors and, where appropriate, proximity probes.
Experimental modal testing using impact hammer or shakers.
Operating Deflection Shape (ODS) measurement to visualise motion and amplification.
3) Analyse
Spectral analysis, order tracking, time history review and correlation to operating conditions.
Structural dynamics interpretation: modes, forcing functions, dynamic coupling and amplification mechanisms.
Finite Element Analysis (FEA) of frames, platforms and components where it adds value.
Model correlation and updating where required, so design decisions are made on a reliable basis.
Typical questions we answer:
Is it resonance, unbalance, misalignment, looseness, dynamic coupling, load-path weakness — or a combination?
Are dynamic stresses exceeding fatigue allowables or detail category limits?
Are vibration levels within ISO, API, VC or project-specific limits?
4) Engineer
Once root cause is proven, we engineer practical solutions within your constraints:
Structural modifications including stiffening, mass changes, bracing and boundary condition changes.
Isolation and mounting systems, tuned supports and interface details.
Support and joint redesign, including fastening strategy, welded detail improvements and layout changes.
Changes that shift natural frequencies, reshape mode behaviour, improve load paths and reduce stress concentrations.
5) Verify
Support during implementation and supplier or fabricator coordination as required.
Post-modification verification measurements to demonstrate objectives are met.
Before/after evidence suitable for design reviews, customer approval, governance, compliance evidence and internal sign-off.
Specialist vibration & structural dynamics services
This page is your hub. The services below can each be expanded into dedicated pages as needed.
Diagnostics & root-cause resolution
On-site diagnostics, structured root-cause analysis, and clear mechanisms such as resonance, unbalance, misalignment, looseness and interaction effects.
Prioritised recommendations that are practical, proportionate and evidence-led.
Vibration measurement & testing
Operational vibration surveys across speed ranges, duty cycles and operating modes.
Data sets and reports suitable for compliance evidence and engineering decision-making.
Structural dynamics, resonance & modal analysis
FEA to identify natural frequencies, mode shapes and sensitivity to stiffness, mass and support changes.
Experimental modal testing and ODS to validate behaviour and guide targeted changes.
Vibration isolation, mounting & plinth design
Isolation and mounting arrangements for industrial machinery and vibration-sensitive equipment.
Plinth and foundation concepts balancing structural integrity and dynamic performance.
Fatigue, durability & reliability
Dynamic stress assessment and fatigue life estimation for welds, brackets, frames and components.
Detail improvements that reduce hot-spots, stop recurrence and cut in-service failure risk.
Design verification & qualification testing
Test planning, instrumentation definition, acceptance criteria and evaluation against standards.
Traceable reports and evidence packs that stand up to technical scrutiny.
What you receive (deliverables)
Clear, plain-English diagnosis of what is happening, why it is happening and what must change.
Assessment against relevant limits and criteria where applicable, including ISO, API, VC and customer requirements.
Practical engineered options and implementable modification design with rationale and priorities based on impact, lead-time and cost.
Before/after evidence from measurements, analysis and plots suitable for internal sign-off, customer review and stakeholder confidence.
Implementation guidance, verification measurements and continued support through installation and commissioning where required.
Who is behind the work?
Paul Schmitz MBA CEng MIMechE MIoA
Chartered Mechanical Engineer and Member of the Institute of Acoustics.
Nearly 30 years specialising in vibration and structural dynamics, with verification-led engineering delivery.
Independent of equipment vendors — we represent your interests with evidence-based engineering.
This page was written by a Chartered Mechanical Engineer (CEng MIMechE, MIoA). Last updated: February 2026.
Assurance
Procurement-ready: Constructionline Gold, SSIP and Achilles UVDB. Certificates and insurance details are available on request.
Where required, we also prepare plans, witness testing and compile evidence so your team can meet internal and external requirements. Compliance is treated as an outcome of sound engineering, not a substitute for it.
Next steps
Call with the symptom, asset type and timescale.
Send any drawings, specifications, photographs, previous plots or reports you already have.
We’ll advise the minimum effective measurement and analysis needed to reach a defensible conclusion and an implementable solution.
Related pages
Common next clicks are below — or contact us and we’ll direct you to the minimum effective route.
Vibration & Structural Dynamics — Frequently Asked Questions
What is the difference between vibration analysis and structural dynamics?
Vibration analysis identifies what is happening, including levels, frequencies, orders and operating dependence. Structural dynamics explains why it is happening through mode shapes, forcing mechanisms, coupling and amplification paths, and guides what must change to remove the problem.
Do you only advise, or can you engineer the solution?
We do both. Where needed we engineer practical modifications, support implementation and verify the improvement with before-and-after evidence in real operation.
Which standards and criteria do you work to?
We commonly work to ISO 20816/10816, ISO 7919, API 619, VC criteria, MIL-STD-810 and RTCA DO-160, plus customer, OEM and project-specific specifications.
What information should we prepare before contacting you?
Asset details, operating conditions, recent failures or symptoms, any existing vibration plots, drawings or photographs of supports and boundary details, and any pass/fail vibration limits or specifications.
Which locations do you cover?
We support projects across the UK, Ireland, Belgium, Germany and Scandinavia, and can support further afield by agreement.