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Foundation isolation for medium and short period structures under the influence of ground motion in short periods，the effect of vibration absorption is better than that of energy dissipation, but it is sensitive to the input characteristics of ground motion, and cannot completely eliminate the risk of resonance. Semi-active control and hybrid control method can meet different defense requirements to improve the safety of structures under earthquake, if intelligent components are introduced, the effect will be better, so it's a new area that deserves attention. In addition, cooperation and cross-study should be carried out between different disciplines and majors, development and use of devices, institutions and supporting technologies to form new industries as soon as possible to support the promotion and application of new technologies and to create a safer and more comfortable working and living environment for human beings.

Wire rope vibration isolator was developed successfully by America in the 1970s, it is a typical nonlinear vibration isolator, its damping force characteristics have something to do with deformation with good vibration isolation performance. When the amplitude is large enough, the wire rope isolator is using dry-friction damping of each wire rope to absorb and dissipate vibration energy. When the amplitude is small, there is no dry-friction damping between each wire rope, it is elastic amplitude depends on wire rope component. The wire rope vibration isolator is a new generation of the elastic component, its advantages are known by people gradually, it is successfully used in ships, warships and aerospace fields. Its prospects of application are wide.

The vibration isolation design process of the above converter units shows that the rated load of the nonlinear vibration isolator is not the only basis for the selection of the isolator. It only shows the maximum loading capacity of the isolator in the long-term safe working. The nominal natural frequency of the nonlinear vibration isolator is also given under a specific amplitude condition, which can not be directly used to evaluate the vibration isolation effect of the vibration isolation system. It is necessary to give full consideration to its nonlinear when designing and make it meet the two requirements of vibration and impact simultaneously. Only in this way is a complete design process, and the advantages of steel wire isolator can be reflected. Due to the selection of the appropriate vibration isolation scheme for the above converter units, the acceleration vibration level difference of the isolator reaches 20~24 dB, and the impact acceleration acting on the units is also reduced from 24 g to 3.8g. Moreover, the isolator has enough allowable deformation to meet the design requirements.

The pipe facing machine is also much helpful to the users. There are many industries where the pipe facing is a must and hence the machine is also a mus

The best way to get rid of such bad nuts without affecting the threading is to use a nut splitter. Adjust this tool over the nut and turn the handle until the nut cracks.

For people engaged in industries, which require using of a tube system, like those in condensers or heat exchangers. There is indeed a need for having a good and top quality tube cleaning equipment.

If you have a boiler installed in your company, you must have ample knowledge about your equipment so that you could take good care of your equipment. A boiler is a huge machine that is used for creating very high degree of pressure and heat, which are used by various industries for different operations and processes, such as heating, cleaning, pressurising moving, etc.