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Some common indications of shock absorber failure air are steering or handling difficulty, uneven braking, abnormal tire wear (especially cupping), springs bottoming out, excessive bouncing after stops, worn steering and suspension components and noise caused by loose shock absorber attaching parts.The shock absorber action should be smooth and uniform throughout each stroke. To check the shock on the vehicle, support the lower control arm or axle and remove the shock''s lower attachment. Grasp the shock absorber body and stroke it up and down as far as possible. Damping forces should be equal on each side shocks of the vehicle. Some vehicles are equipped with gas-charged shocks. Their sealed gas pressure will resist expansion and compression.
The combination of the placebo transducer and the ''check'' transducer allows us to document almost all of the aforementioned undesired responses with the noted exception of thermal line effects due to transient temperature. The Model 134 Blast Probe (Figure 4) is principally used to define the fast-rise-time shock front. Due to the acoustic wave-guide principle on which the probe operates, a thin layer of black tape kits on its front face is required to mitigate thermal inputs to its very thin tourmaline crystal. This transducer is not intended to record the entire pressure-time history of the blast pulse. Adding additional tape at the probe''s front boundary will provide greater thermal delay, but will also result in increased mechanical impedance, which degrades performance. Thus, its application is limited to short record times. Longer air record times, such as those shocks required for the total pressure impulse, necessitate a transducer with a mechanical configuration like that shown in Figure 5. Fortunately a transducer made like Figure 5 produces a very recognizable signature when a transient thermal input creates a problem. A thermal transient initially couples into and causes various dimensional changes followed by expansion of the preload sleeve containing the quartz crystal assembly. The byproduct of this later expansion shows up as a positive (i.e., nonreturn to zero) signal residing after the blast event is clearly over.
One of the notable pioneers in this field was Mr. Ben Granath who originally worked at BRL and subsequently founded Susquehanna Instruments, a development line company for blast transducers. This company is now a part of PCB Piezotronics. Photographs of two transducers, which resulted from Mr. Granath''s work, are provided as Figure 4.In Figure 4A, the pencil probe, is obviously intended for sideon pressures. Its quartz acceleration compensated piezoelectric sensing element is built into the housing. The geometry of the contained piezoelectric element, as well as the velocity of the shock front of the blast wave passing over it, control its rise time. This transducer covers a pressure range extending to 1000 psi. The transducer in Figure 4B works on the principle of a pressure bar. Its sensing element is tourmaline, which is interfaced to an internal bar. The bar is acoustically impedancematched to the tourmaline, resulting in a 1.5-MHz resonant frequency kits for the transducer. This model transducer is used for reflected pressure measurements to 20,000 psi.
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