59results about How to "Reduce resonance phenomenon" patented technology

The invention relates to an ice-breaking and snow-removing device, which belongs to the technical field of ice-breaking and snow-removing appliances, and solves the technical problem that the hard ice layer and compacted snow layer are not cleaned thoroughly in the prior art; the invention includes a drum, a shock absorber, a shock absorber bracket, Blades, blade supports, belt wheels, roller brackets, front baffles, roller covers and cleaning plates; the belt wheels are connected to the engine in the car body through belts; a plurality of blade supports are spirally distributed on the drum, and each blade supports The seat is fixedly connected with the drum, each blade support is equipped with a blade, and each blade support is connected with the corresponding blade through pins; the cleaning plate is fixedly connected with the rear of the roller support, and one end of the shock absorber is fixedly connected to the shock absorber On the bracket, the shock absorber bracket is fixedly connected with the car body, the other end of the shock absorber is fixedly connected with the front part of the roller bracket, the roller cover is welded on the roller bracket, the roller bracket is hinged with the car body, the front baffle is connected with the roller bracket The front part is fixedly connected; this device ensures the thoroughness of cleaning.

The invention relates to a preparation method of a laminated sound insulation material and belongs to the technical field of sound insulation materials. The preparation method is characterized in thatamorphous nano-silica formed by hydrolyzing ethyl silicate is deposited into internal pores of a medium density fiberboard with a coupling agent; the pores of the prepared composite medium density fiberboard have high extension tortuosity, and an internal channel is complex, so that sound waves have high consumption in the communicated pores after entering the material, and the sound absorption property is effectively improved; meanwhile, the roughness of pore walls is improved, the viscosity of air in the pores is improved, and viscous resistance is improved; due to the viscous resistance ofthe air and friction between air molecules and the pore walls, sound energy is converted into electric energy and further is consumed; because of more internal pores, the sound waves repeatedly propagate and further energy is continuously converted and dissipates, and the material absorbs partial sound energy; meanwhile, a large amount of micro pores and holes are formed inside the material, so that gap air at the holes vibrates to dissipate the sound energy, and propagation of sound is well stopped and attenuated in a micro-element structure.