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SPM HD. SPM HD® is a patented further development of the Shock Pulse Method (SPM) used for a fast, easy, and reliable diagnosis of the operating condition of rolling element bearings. It provides easy-to-understand condition evaluation in a green-yellow-red scale, as well as crystal-clear spectrums and time signals for further analysis.

Vibration enveloping is commonplace for many of you. The shock pulse method was invented in the late 1960s. In rolling element bearings, there is a phenomenon where electric waves, or elastic waves, or shock pulses, or impact signals, are generated. The amplitude of these impacts is determined by three different parameters.

3. SHOCK PULSES. Two types of shock pulses, a half-sine shock pulse and a sawtooth shock pulse, are specified. The pulse shape and tolerances are shown on figures 213-1 and 213-2, respectively. For single degree of freedom systems, a sawtooth shock pulse can be assumed to hav e a damage potential at least as great as that of the

monitoring unit employing the two most reliable methods for automatic condition monitoring: shock pulse and vibration severity measurements. MG-4 is.

Signal and measurement. Transducer and measuring procedure are the same as for the dBm/dBc method (TD-213). The shock pulse meter counts the rate of occurrence 

The shock pulse method was the start of condition monitoring and condition based maintenance, targeting the machine part that causes most breakdowns, the bearings. The scientific task was to find a physical event that mirrored bearing con- dition, quantify it, and transform the mea- sured value into a condition reading.

down. Condition monitoring should always priate technique for the application makes the machine work, is directed start with a list of machine faults, and for 

Shock Pulse Method filters out this phase of the collision, as the magnitude of the vibration is structure and material dependent. Measuring Shock Pulse Signals 

Shock Pulse Method is a signal processing technique used to measure metal impact and rolling noise such as those found in rolling element bearings and gears. Much more refined than other high frequency measurements, Shock Pulse is widely used throughout the world as a basis for predictive maintenance. Rolling element bearings are the most common

Shock pulse amplitude is due to three basic factors: • Rolling velocity (bearing size and rpm) • Oil film thickness (separation between the metal surfaces in the rolling interface). The oil film depends on lubricant supply and viscosity as well as alignment and pre-load.