shock pulse method pdf

conditions by shock pulse method Shock Pulse Meter 6−2000 tester with accelerometer The 6−2000 is switched on by pressing any of the five function keys. Power down function is automatic and happens approx 30 seconds after a function key is pressed. If the instruments fails to power down within one

would be virtually impossible. This is particularly true if a mechanical test method is used to simulate the pyrotechnic event. Another approach is needed for testing. X The shock response

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

For almost 50 years, the original Shock Pulse Method (SPM) has been very successfully used to Unlike vibration transducers, the shock pulse transducer.

The Shock Pulse Method is the monitoring and analyzation of high freauency compression (shock) waves generated by a bearing while rotating. From this.

759 kB. 12/19/2013. In conjunction with the company’s 40th anniversary, SPM Instrument AB now presents the next generation of its wellknown shock pulse method. SPM HD® is an advanced and patent pending measuring technique suitable for all types of applications and particularly well suited for low speed machinery.

where τ – the shock pulse duration, ms; ρ1 and ρ2 – the density of the hammer material and the material under test, respectively, kg/m 3 ; V 0 – relative velocity of bodies at the initial

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

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 is based on the knowledge that a shock, i.e. a mechanical impact, causes particles to accelerate at the point of impact. In turn, the accelerated particles give rise to a pressure wave whose propagation during the initial stages is only defined by the impact speed.

The purpose with this description is to give an understanding of what shock pulses are, how they are measured and quantified and finally how to interpret them.

shock pulse, as well as for test level specification. Note that MIL-STD-1540C and MIL-STD-810E require this format for certain shock environments. The purpose of this report is to explain the shock response spectrum and to give a derivation of a calculation method. The calculation method is carried out in the time

The terminal peak sawtooth is the default classical shock pulse to be used for this condition. Figure 516.7-10 from MIL-STD-810 shows its shape and tolerance limits. Table 516.7-IV contains the terminal peak sawtooth default test parameters for Procedure I -Functional Test. In limited cases a half sine shock impulse is specified.

This Shock Pulse is in the ultrasonic frequency band and typically occurs around a center frequency of 36 kilohertz. The amplitude of the Shock Pulse is relative to the velocity of the

I have attached a description that is short and pretty good part from the things around SPM, it is named Shock Pulse Method, it is not invented by SKF but they had a cooperation in the 1970's and later split up otherwise it looks pretty clear but maybe a few more methods exist. Olov Attached Files envelope_analysis.pdf (864.32 KB, 47 views)

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.

In simple terms, the Shock Pulse Method detects development of a mechanical shock wave caused by technique. it is possible to measure the shock pulses -.

Manual recording, free quantity LEO151 Shock pulse method dBm/dBc and LR/HR For over 30 years, the original Shock Pulse Method (SPM).

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.

Technical data Material, casing: Shock pulse measurement 185 g (6.5 ounces) including batteries Measurement technique: dBm/dBc, measuring range -9 to.

The shock machine utilized shall be capable of producing the specified input shock pulse as shown on figures 213-1 or 213-2, as applicable. The shock machine may be of the free fall, resilient rebound, Tolerances for terminal-peak sawtooth shock pulse. METHOD 213B 16 April 1973 . 3 . MIL-STD-202G Duration of pulse (ms) Low frequency cut-off