Method and description of dynamic vibration reduction in cabins of gantry cranes

Abstract

Reduction of vibration in the cabin can be achieved by increasing the area of vibration absorption by placing on the ceiling and floor vibro-absorbing facings. The process of absorption of vibration occurs due to the transition of the energy of oscillating particles to heat due to frictional losses in the pores of the material; therefore, for effective vibration absorption, the material must have a porous structure, the pores must be open from the side of the vibration and join together (unclosed pores) so as not to prevent the penetration of the vibration wave into the thickness of the material. As a vibration-absorbing cladding, we use a construction in the form of a layer of a homogeneous porous material of a certain thickness, reinforced directly on the surface of the fence.

Means and methods of noise protection to reduce the risk of cardiovascular disease in workers

“…Technological measures to reduce the noise level in the source include: reducing the amplitude of oscillations, speed, etc [1,3,5,7,9].…”

Theoretical studies on the calculation of the noise of impact equipment in blacksmith shops

“…Noise reduction is achieved by creating new designs of low-noise automatic devices, for example, placing gears in oil baths, closing them with soundproof casings, replacing the power spring of the short circuit in the cam mechanisms of the drive slider by springs with kinematic closing and cams designed according to the law motion, providing a sinusoidal symmetric law of change of the accelerator of the pusher. These measures reduced noise by 5-9 dB [1,3,5,7,9].…”

“…In the latter case, there are changes in cardiac activity, general excitement, or, conversely, inhibition, fatigue, the appearance of pain, a feeling of shaking of the internal organs, nausea. In these cases, vibrations also affect the osteoarticular apparatus, muscles, peripheral circulation, vision, hearing [1,3,5,7,9]. Local vibrations cause spasms of blood vessels that develop from the terminal phalanges of the fingers, spreading to the entire hand, forearm, and cover the vessels of the heart.…”

Soundproofing presses by placing its nodes in a soundproof casing, including drive components

“…Aerodynamic noise occurs when the clutch and brake are turned on when the scale is blown off from the finished products of the tool and from the work of the fan for blowing jobs ( fig.1). To reduce mechanical noise, it is necessary to reduce the force and speed of impact of parts, replace impact interaction by shockless, reduce the number of revolutions of rotating masses, increase the accuracy of manufacturing parts and press assemblies, apply lubrication to mutually moving parts, make one or both of the colliding parts from a material with a lower elastic modulus, to cover colliding elements with non-metallic materials, to ensure careful static and dynamic balancing of moving parts [1,3,5]. The strength and speed of impact of parts can be reduced by installing knee-lever or articulated drive mechanisms that provide the differential speed of the press slide on different parts of the working stroke.…”