Commissioning a vibration testing laboratory: what a shaker table actually reproduces and what it cannot, why the fixture is part of the test, and what a battery testing laboratory adds in safety containment when the same sample is then abused

Commissioning the work

1. Name the profile, the axes and the duration. A random vibration profile, a sine sweep or a shock pulse are different tests, and the level, the frequency range, the duration and which axes are driven all have to be stated. A request to vibration test something is not a specification.
2. Treat the fixture as part of the test. The fixture couples the shaker to the specimen and its own resonances will either amplify or absorb the input. A fixture designed to be stiff through the test frequency range, with control accelerometers placed as the standard requires, is what makes the input the specimen sees the input you asked for.
3. Decide what constitutes a failure before the test. Visible damage, loss of function, an intermittent connection during the test, or a change in a resonance survey before and after. Deciding afterwards is deciding with a result in front of you, and a resonance survey either side is the most informative comparison available.
4. For batteries, establish the containment and the safety case first. Abuse testing deliberately drives cells to failure, so the laboratory needs a containment chamber, gas handling, fire suppression and people trained for a thermal runaway. Ask to see the facility rather than reading about it.
5. Check the accreditation scope covers the exact test. Accreditation is granted for specific standards over specific ranges and axes, and transport testing in particular is governed by specific regulations. A laboratory accredited for one standard is not thereby accredited for the one your product needs.

Combining vibration with temperature

Many service environments are hot or cold as well as vibrating, and a combined chamber tests both together. Failures that appear only under combined loading are common and are exactly what a sequential test misses.

Combined testing costs more and fewer laboratories offer it, so confirm capability and the chamber's size against your specimen early rather than at booking.

What the report should contain

The profile as demanded and as achieved, control and monitoring accelerometer positions and traces, the fixture description, resonance surveys before and after, and photographs. A report with a pass statement and no traces is not reviewable.

Ask for the raw data as well as the document. Reconstructing a spectrum from a printed plot is impossible and it is what somebody will want in a year.

Transport and shipping tests

Shipping tests are a distinct family with their own standards, covering drop, compression and the vibration of a vehicle. For batteries, transport testing is a regulatory requirement rather than a design exercise.

Ask the laboratory which regulation applies to your product and in which markets. Getting that wrong is discovered at a border rather than in a report.

Medical device testing laboratories, and the tests a submission needs

A device submission asks for evidence in several separate disciplines, and few laboratories cover them all: biocompatibility to the relevant standard series, sterilisation validation and residuals, packaging and shelf life including transport simulation and ageing, electrical safety and electromagnetic compatibility for anything powered, software verification, and the mechanical or performance testing the device's own standard names. Ask which of those a laboratory holds accreditation for, and who writes the test plan, since a plan that maps tests to the standard's clauses is most of the work.

Weld failure analysis and the sequence that matters

Weld failure analysis starts before anything is cut: the fracture surface, the position in the joint and the service history decide what the metallurgy will mean. Sectioning destroys evidence, so photographs and a documented sequence come first. The report distinguishes a fabrication defect from a service failure, and that distinction is usually what the commercial question turns on.

Materials failure analysis and the questions a laboratory answers

Materials failure analysis identifies the mechanism, fatigue, overload, corrosion, embrittlement or wear, and then whether the material met its specification. Those are two separate findings and a report should carry both. The methods are microscopy, hardness and composition first, with mechanical testing where a property has to be proved, and each step is chosen from what the fracture surface already showed.

Failure analysis engineering as a discipline rather than a test

Failure analysis engineering is the reasoning that links a broken part to a root cause: what the design assumed, what the service loads were, and where the two diverged. A laboratory supplies the evidence and the engineering supplies the argument, which is why a report that lists results without a conclusion is unfinished work. Corrective action and a re-test plan are what the client is buying.

Electronic failure analysis and its own instruments

Electronic failure analysis works at a scale the mechanical methods cannot reach, using decapsulation, curve tracing, thermal imaging and cross sectioning to find a defect on a die or in a joint. Non destructive steps come first, since electrical characterisation is impossible after decapsulation. Solder joint cracking and electromigration are the recurring findings, and each has a distinct signature.

Product failure analysis and the field return

Product failure analysis deals with the assembly rather than the component, so the first task is reproducing the failure and the second is isolating it to a part. Field returns arrive contaminated and often partly disassembled, which is why intake photographs and a chain of custody matter. A pattern across returns is stronger evidence than any single unit and is what drives a design change.

Non destructive testing services and what each method sees

Non destructive testing services choose a method by the defect being looked for: ultrasonic for internal volumes, radiographic for density changes, magnetic particle and dye penetrant for surface cracks, eddy current for near surface conductive materials. Each has a detection limit, and a report without that limit cannot support a fitness for service statement. Operator certification is part of the service.

ndt rt testing and the safety case around it

ndt rt testing means radiographic inspection, which images internal features by attenuation and is the standard for weld volumetric inspection. It brings a controlled area, a source licence and a dose monitoring regime with it, so scheduling and site access are part of the cost. Digital detectors have shortened exposure and made the record easier to store and to review later.

Common questions

What has to be specified for vibration testing?

The standard or profile, the level and frequency range, the duration, which axes are driven, the mounting and the pass criteria. Without those, two laboratories will run different tests and both will be correct.

Why does the fixture matter so much?

Because it sits between the shaker and the specimen and has its own resonances. A poor fixture amplifies some frequencies and absorbs others, so the specimen never sees the specified input and the test proves nothing.

What does a battery testing laboratory need that others do not?

Containment chambers, gas extraction, fire suppression and staff trained for thermal runaway, because abuse testing deliberately causes failure. For transport testing, accreditation to the specific regulations that govern shipping cells.

Should the product be tested functioning?

Where it is functioning in service, yes, with monitoring during the test. Intermittent faults that appear only under vibration are exactly what the test exists to find and are invisible in a post-test inspection.

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