In recent decades, experts and scholars at home and abroad have conducted a lot of research on the vibration isolation performance of metal rubber materials. As early as the 1960s, the United States used metal rubber components on weapons and equipment. At present, Russia's research level in metal rubber technology ranks in the forefront of the world. Its strategic missile can be launched at any time without inspection during the 10-year storage period. The key is to use a large number of metal rubber components.
The metal rubber material is a metal material obtained by winding a metal wire into a spiral shape, being woven, pressure molded, and processed. It not only has rubber-like elastic properties, but also a porous material. Metallic rubber materials combine elasticity and porosity, which are irreplaceable by other materials. It has the characteristics of large damping, absorption of impact energy, fear of high and low temperature, and aging. As a vibration isolating device, metal rubber materials have received increasing attention in aerospace and other fields. Therefore, the rubber metal isolator is particularly suitable for aerospace. It has both the inherent properties of metal and the elastic and damping properties similar to rubber isolators. Rubber metal isolators
solve the problem of vibration isolation in extremely harsh environments with good vibration isolation. Even in a conventional environment, due to its long storage period, it is practical to enhance the maintenance of the equipment and improve the reliability of the equipment.
At present, the vibration isolating material used for daily use is a rubber damping material. However, the elastic and damping properties of the rubber material are susceptible to the ambient temperature and the heat dissipation coefficient is small. It is easy to generate heat under the action of alternating load to generate thermal stress fatigue and aging, which causes degradation of elastic damping characteristics. It has poor resistance to pollution and acid corrosion and a narrow frequency range. Therefore, it must be replaced regularly. The new metal rubber material can make up for the shortcomings of the above rubber materials, and is an excellent material for replacing the rubber material and suitable for use in harsh environments. At the same time, the material is made into a vibration isolator, which has a large damping in the resonance region of the system, and can effectively suppress the conjugate. In the vibration isolation zone of the system, there is a small damping, so that the system has good vibration isolation efficiency.
For on-board instrumentation (including inertial platforms), the traditional method is to install a rubber type isolator outside the instrument housing. This kind of vibration isolation method can achieve satisfactory results for the mechanism source of "discrete spectrum type" as long as the design parameters of the vibration isolator are correctly and reasonably selected. However, because the dynamic environment of missiles, rockets and other aircraft often has the characteristics of "wideband random excitation", such traditional elastic vibration isolators, including rubber vibration isolators, cannot be designed to avoid resonance. With the development of modern science and technology, modern military technology has continuously increased the requirements for the guidance precision of missiles, rockets and other aircraft. The resonance transmission rate of the conventional vibration isolator at the resonance point has far exceeded the technical specifications acceptable for the precision instrumentation on the missile. For some important instruments, such as inertial platforms, the viscoelastic damping isolator can achieve a smaller resonance transfer rate than the conventional isolator, which greatly improves the dynamic performance of the vibration isolator. However, viscoelastic materials are sensitive to temperature and have poor creep resistance, making it difficult to meet long-term storage requirements. Therefore, the development of a new type of vibration isolator for harsh environments is an urgent task for vibration isolation of military products.
Inertial navigation systems are the core components of flying missiles, rockets, nuclear submarines, and strategic bombers. The development level of inertial technology and inertial devices is an important indicator of a country's military strength, and the inertial platform is the core component of platform-based inertial navigation. The rubber metal isolators can be called a new inertial platform isolator that adapts to the harsh mechanical environment conditions of the new type of weapon system. It not only has good dynamic and static characteristics, but also works well under high vacuum, high and low temperature conditions, and has anti-corrosion and unrestricted shelf life, thus overcoming the Achilles heel of the common rubber vibration isolator on the platform over time.
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