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Shock pulse method (SPM) is a technique for using signals from rotating rolling bearings as the basis for efficient condition monitoring of machines. From the innovation of the method in 1969 it has been further developed and broadened and is a worldwide accepted philosophy for condition monitoring of rolling bearings and machine maintenance.
Shock is a vector that has units of an acceleration (rate of change of velocity). The unit g (or g) represents multiples of the standard acceleration of gravity and is conventionally used. A shock pulse can be characterised by its peak acceleration, the duration, and the shape of the shock pulse (half sine, triangular, trapezoidal, etc.).
A shock on a cushioned item usually has a smoother shock pulse., and thus more consistent responses from shock detector. Shocks are vector quantities with the direction of the shock being important to the item of interest, Shock detectors also can be highly sensitive to the direction of the input shock. [1] A shock detector can be evaluated:
A Shock Response Spectrum (SRS) [1] is a graphical representation of a shock, or any other transient acceleration input, in terms of how a Single Degree Of Freedom (SDOF) system (like a mass on a spring) would respond to that input. The horizontal axis shows the natural frequency of a hypothetical SDOF, and the vertical axis shows the peak ...
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The Circulation Improving Resuscitation Care (CIRC) trial is the largest prospective randomized trial to date for mechanical chest compressions in out-of-hospital cardiac arrest (OHCA). The goal was to demonstrate that the AutoPulse Non-invasive Cardiac Support Pump is a safe and effective component of a system of care focusing on high-quality ...
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Motors weighing 250 pounds (110 kg) or less shall be tested on the lightweight shock testing machine. Motors weighing in excess of 250 pounds and up to 6,000 pounds (2,700 kg) shall be tested on a medium weight shock testing machine. Motors weighing over 6,000 pounds shall be tested on a floating shock test platform or barge test.