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Shock Absorbers

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77. Energy Management Utilizing the Hydraulic Shock Absorber

The advent of high speed equipment and machinery has brought with it numerous problems associated with slowing and stopping masses of various forms. The hydraulic shock absorber has proven to be one of the most satisfactory means of solving these problems, yet the shock absorber still remains as one of the least understood fluid power components. This paper presents design constraints, design parameters and a description of how to use shock absorbers into a system for the purpose of dissipating kinetic energy. Information is presented in both qualitative and functional equation format to enable the reader to grasp the subjective aspects of shock absorber usage which go beyond normal mathematical constraints.
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15. Reduction of Shock Response Spectra Using Various Types of Shock Isolation Mounts

This experiment demonstrated how various types of shock absorbers can reduce the overall shock response spectra of a structure subjected to high impact shock. This was accomplished by measuring the acceleration on a weight dropped onto three different shock absorbers from various heights and analyzing the resulting data. A baseline test was performed with a steel hard mount. This was followed by tests with three different soft isolation mounts; a half inch thick neoprene pad, a urethane rubber tube on its side and a hydraulic liquid spring type shock absorber. Results show that both the dominant frequencies and the peak acceleration get lower as the isolation system gets softer. This information can be valuable in the design of isolation systems.
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14. Precise Positioning Shock Isolators

Conventional approaches to the shock isolation of delicate systems often involve the use of low frequency shock mountings. This type of mounting is not usable on systems where precise alignment must be maintained over a long period of time. This paper describes a new type of isolator which combines excellent attenuation with the ability to precisely maintain system alignment in the pre and post shock environment. This new shock absorber acts as a rigid link under normal conditions. Then, when a shock occurs, it strokes in both tension and compression with damping in both directions. After things calm down the shock returns precisely to its original length. Computer simulation and test results are included.

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