Latest generation of SPM Instruments' shock pulse monitoring technology, SPM HD is an advanced and patent pending measuring technique suitable for all types of applications, particularly well low-speed machinery.
Condition monitoring is all about optimising operations and maintenance for the purpose of lowering costs, contends SPM — and the difficulties of getting reliable results when measuring on low-speed applications are a well known problem. These applications create signals with low energy content, where earlier vibration technologies made it difficult to measure such signals with satisfactory results.
Now, the new SPM HD measuring technique combines the established True SPM method with a highly advanced digital technique. With its high dynamics, SPM HD can distinguish the weaker yet relevant signals, which are typically hidden among stronger signals caused by mechanical shock phenomena or electronic noise. The ability to detect these very weak signals gives decisive advantages when measuring at low speeds — and 'real world' testing has provided up to six months’ forewarning, leaving ample time to plan maintenance and repairs.
SPM sauys that the name 'SPM HD' (High Definition) hints at the extraordinary signal quality as well as a very clear picture of machine condition resulting from the measurements. This new system is built around sophisticated and patent pending signal processing in several steps: the technique works with digital enveloping of the analog shock pulse transducer signal. Sampling frequency is very high, resulting in a crisp and distinct signal, while a 24-bit A/D converter provides razor-sharp resolution and exceptional detail in spectrums and time signals.
Capturing the relevant signals
For a full picture of bearing condition, the measuring cycle is based on number of revolutions rather than time. This maximises the chances of capturing relevant signals in the course of one measuring cycle. And by adjusting the sampling frequency to rpm, spectrums are clear and concise.
The measuring technique looks for recurring patterns and uses newly developed and ingenious algorithms to enhance repetitive signals and eliminate randomly occuring high readings. Thanks to the pattern recognition, spectrums and time signals are excellent tools for analysis. The source of the signal is simple to identify, as every component has its own, distinct damage signature.
Time signals are easily interpreted, making the type and extent of the damage simple to determine: the benefit of this is no trending is required — occasional measurements provide a reliable diagnosis.
”SPM HD is the unique solution to the problems involving condition measurement on low-speed applications," said Mikael Lindfors, Manager of Business Solutions at SPM. "It sets a new standard for modern condition monitoring and can be used successfully on all types of applications."
