Comparison of Shock Response Spectrum for Different Gun Tests

Cordes, J. A.; Vo, Peter H.; Lee, J.R.; Geissler, David W.; Metz, Joachim; Troast, Douglas; Totten, A.L.

doi:10.1155/2013/980895

Cited by 13 publications

(6 citation statements)

References 7 publications

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“…e on-board recorder assembly was design to be a rough match of the electronics package mass and stiffness. Axial G-forces in the range of 15-kgs and transverse force in the range of 3-kgs are expected, applied with different frequency content [9]. Components are typically designed for the maximum G-force which occurs in the gun tube at around 0.0038 sec.…”

Section: Applied Load and Outputmentioning

confidence: 99%

Thermomechanical Impact of Polyurethane Potting on Gun Launched Electronics

Haynes

Cordes

Krug

2013

Journal of Engineering

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Electronics packages in precision guided munitions are used in guidance and control units, mission computers, and fuze-safe-andarm devices. ey are subjected to high g-loads during gun launch, pyrotechnic shocks during �ight, and high g-loads upon impact with hard targets. To enhance survivability, many electronics packages are potted aer assembly. e purpose of the potting is to provide additional structural support and shock damping. Researchers at the US Army recently completed a series of dynamic mechanical tests on a urethane-based potting material to assess its behavior in an electronics assembly during gun launch and under varying thermal launch conditions. is paper will discuss the thermomechanical properties of the potting material as well as simulation efforts to determine the suitability of this potting compound for gun launched electronics. Simulation results will compare stresses and displacements for a simpli�ed electronics package with and without full potting. An evaluation of the advantages and consequences of potting electronics in munitions systems will also be discussed.

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Section: Applied Load and Outputmentioning

confidence: 99%

Thermomechanical Impact of Polyurethane Potting on Gun Launched Electronics

Haynes

Cordes

Krug

2013

Journal of Engineering

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“…The presented solutions refer to the tolerated requirements in terms of static stress on a chock. The sum of the engine deadweight and the tension on all bolts, hardener ratio guide, and sometimes the calculations are presented (11).…”

Section: Introductionmentioning

confidence: 99%

Anti-Shock Foundation of Naval Engines for Naval Vessels

Grządziela¹,

Kluczyk²

2022

JMS

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The foundation of engines for naval vessels ensures multi-axis stiffness values and optimal isolation of harmonic vibrations on all axes. Another factor is the shock impulses caused by the battle actions of the ships. Dynamic impulse loads result from underwater or surface detonation of sea mines, a hit by a missile or an artillery shell. Such an impact is a high-energy step impulse. The paper presents the problem of selecting the physical parameters of materials used for shock absorbers. The presented models of material properties ena-ble the presentation of physical and mathematical shock absorbers models for both impulse and harmonic interactions.

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“…Once the bullet hits the wall of the tube in the water, it exponentially disperses pressure impulses with peak pressures in the range of up to 70 MPa and decay times in the range of 0.1–1.5 ms are created. Peak pressure values and pulse duration are functions of the projectile speed and mass, respectively [ 10 ]. A device such as this allows a precise mathematical model of the detonation wave to be developed.…”

Section: Introductionmentioning

confidence: 99%

Shock Absorbers Damping Characteristics by Lightweight Drop Hammer Test for Naval Machines

Grządziela

Kluczyk

2021

Materials

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The technical requirements for naval ships machine foundations are far more strict in comparison to merchant’s vessels. These requirements are confirmed in the military standardization of many countries. Underwater Explosion (UNDEX phenomena) detonation pulses, force naval engineers to design and implement different shock absorbers made from a wide variety of materials. This study presents the tests results of typical shock absorber designs made of various types of rubber and elastomers. The initial objective of the study was to determine the energy absorption of shock impacts, the choice of materials capable of operating within the temperature range of 0 °C to 70 °C, resistance to contact with oils and marine fuel, performance at frequencies ranging from 5 to 30,000 Hz, and absorption no less than 40% of harmonic vibration energy. Initial studies conducted on tensile testing machine were used to determine the static and dynamic stiffness of a shock absorbers. Considerations of stiffness coefficient for the linear and nonlinear range is typical for shock pulses. Further tests were carried out on a lightweight drop hammer to determine the characteristics of the damping coefficient for high-speed wave interactions—Shock Response Spectrum (SRS). The final aim of the study was to assess the repeatability of the shock absorbers response to multiple impact loads. Mechanical properties describing possibilities of tested dampers materials to absorb energy of UNDEX were also presented.

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Comparison of Shock Response Spectrum for Different Gun Tests

Cited by 13 publications

References 7 publications

Thermomechanical Impact of Polyurethane Potting on Gun Launched Electronics

Thermomechanical Impact of Polyurethane Potting on Gun Launched Electronics

Anti-Shock Foundation of Naval Engines for Naval Vessels

Shock Absorbers Damping Characteristics by Lightweight Drop Hammer Test for Naval Machines

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