2results about How to "Good environmental tolerance" patented technology

The invention relates to the technical field of satellite laser communication, in particular to a locking device suitable for a laser communication load. The second support is connected with the bottom plate, and containing cavities penetrating in the axial direction are formed in the first support and the second support. The locking shaft is arranged in the containing cavity in a penetrating mode, the locking shaft is used for connecting the first support and the second support, and the locking shaft is provided with a weak part; the expansion assembly is arranged in the containing cavity, and the expansion assembly deforms by being heated and pushes the locking shaft in the axial direction so that the locking shaft can be broken at the weak part. The locking shaft ensures that the degree of freedom of the optical rotary table is stably limited in the satellite launching process, the thermal expansion characteristic of the expansion body is utilized, the locking shaft is rapidly broken under the combined stress effect of axial tension and circumferential torsion, the degree of freedom of the optical rotary table is recovered, and the risks of jamming and failure of an existing plug pin type scheme are avoided.

The application discloses a kind of low-frequency broadband sound-absorbing metamaterial structures and super-constructed sound barriers based on metal foam, and the metamaterial structure includes metal foam layer and composite resonant cavity layer, and the metal foam layer and the composite resonant cavity layer are stacked;Composite resonant cavity layer includes mother cavity structure and sub-cavity structure, and the sub-cavity structure is embedded in the mother cavity structure, and the mother cavity structure and the sub-cavity structure are all provided with openings towards the metal foam layer, so that the incident sound wave can enter the mother cavity structure and the sub-cavity structure after propagating through the metal foam layer;The cavity of mother cavity structure and sub-cavity structure is unidirectional equal-section cavity.The application is applied to the field of acoustic noise reduction, realizes the high-efficiency sound-absorbing performance of low frequency and wide band, has high stiffness and strength and excellent environmental adaptability, can bear, has good environmental tolerance, has excellent fireproof performance, is suitable for various complex and severe environments, ensures long-term stable working state, is convenient for low-cost mass production, and improves economic feasibility.