18 results about "Constrained-layer damping" patented technology

A dampened flexure mount is capable of enhancing the vibration isolation of sensitive equipment, including optics or electronics in aerospace and space applications. The mount incorporates two or more materials in its design, where one material imparts rigidity, while the other material imparts flex dampening properties. The mount comprises x, y, and z flexures, making it quasi-kinematic in all axes. The mount further comprises constrained layer damping in a flexure mount. A viscoelastic material is disposed in the mount, and, in some cases, is disposed in one or more of the x, y, and z flexures. Vibrational energy, instead of adversely impacting the equipment, causes shearing in the viscoelastic material. Over time, this vibrational energy transforms into heat in the viscoelastic material, damping the vibrations that could disturb the attached equipment's operation.

The invention discloses a composite restraint layer damping vibration attenuation structure for a curved mirror, and belongs to the technical field of optical precision instruments. The structure comprises a curved lens, a viscoelastic material layer laid on the back surface of the curved lens, and a metal restraint sheet attached to the viscoelastic material layer. The core is that the metal constraint sheet has non-uniform rigidity and mass distribution in collaborative design. The cross section of the steel plate is a step-shaped outline formed by alternately connecting a plurality of web sections and wing plate sections, and preset rigidity gradient distribution in the specific direction is achieved by enabling the web sections to have the length changing in a gradient mode. And meanwhile, an opening array is integrally formed on each plate section forming the step-shaped outline, so that preset mass distribution is realized. Through collaborative design, the structure can be coupled with a plurality of high-frequency vibration modes such as bending and torsion of the lens, and energy is efficiently dissipated. According to the vehicle-mounted head-up display system, the problems of image dithering and blurring caused by lens vibration in the vehicle-mounted head-up display system are effectively solved through a lightweight and miniaturized structure.

The I-shaped steel component with the damping material comprises a steel part integrally formed by a web plate and a wing plate, anti-vibration assemblies are arranged on the two sides of the web plate, and each anti-vibration assembly comprises a damping layer attached to the side face of the web plate and a restraining plate bonded to the outer surface of the damping layer through an adhesive layer; and the damping layer is sleeved and positioned with a positioning column protruding from the side surface of the web plate through a sleeving hole in the damping layer. The I-shaped steel component with the damping material aims to overcome the existing defects, mechanical energy of structural vibration is efficiently converted into heat energy through a restraint layer damping structure formed by the damping layer and the restraint plate, the heat energy is dissipated, vibration and noise of a ship engine room are effectively restrained, and the service life of the ship engine room is prolonged. Through the design of the positioning columns and the sleeving holes, rapid and accurate positioning of the damping layer is achieved; the adsorption magnets provide reliable temporary fixation, hands of operators are liberated, gluing and subsequent installation are facilitated, and the device is particularly suitable for high-altitude or narrow space operation.

The invention relates to an anti-squeal pad for brake discs of a lightweight vehicle such as bicycles, scooters and possibly motorcycles and low-speed cars. The anti-squeal pad is attached to the brake disc, or the anti-squeal pad constitute an integrate part of the brake disc. The anti-squeal pad comprises a constrained layer damping (CLD) pad with at least one metallic layer and at least one viscoelastic layer for attaching the pad to a side surface of parts the brake disc or for inserting between parts of the brake disc. The invention also relates to a brake disc and to a disc brake assembly with such anti-squeal pad and to a vehicle with such disc brake assembly.

The application discloses a composite constraint layer damping vibration reduction structure for a curved mirror and belongs to the technical field of optical precision instruments. The structure comprises a curved mirror, a viscoelastic material layer laid on the back of the curved mirror, and a metal constraint sheet attached to the viscoelastic material layer. The core of the structure is that the metal constraint sheet has a cooperatively designed non-uniform stiffness and mass distribution. The cross section of the metal constraint sheet is a stepped profile formed by alternately connecting a plurality of web segments and wing plate segments, the length of the web segments is made to change in a gradient manner, so that a preset stiffness gradient distribution along a specific direction is realized; meanwhile, an opening array is formed on each plate segment constituting the stepped profile as a whole, so that a preset mass distribution is realized. Through the cooperative design, the structure can couple multiple high-frequency vibration modes such as bending and torsion of the mirror, and efficiently dissipate energy. The application effectively solves the image jitter and blur problems caused by mirror vibration in a vehicle-mounted head-up display system by using a light-weight and small-sized structure.

The invention provides a shear restraint layer damping type pulse magnet coil and a preparation method thereof, and the pulse magnet coil comprises a coil body which forms an annular magnet structure; the structural shape of the insulating structural body is matched with the appearance of the coil body, and the insulating structural body wraps the outer side of the coil body, is made of an insulating material and is used for limiting the radial deformation of the coil body; and the viscoelastic damping layer is arranged between the coil body and the insulating structural body, wraps the coil body and is made of a viscoelastic material, and the two sides of the viscoelastic damping layer are fixedly connected with the outer surface of the coil body and the inner surface of the insulating structural body respectively. When pulse current is introduced into the coil body to generate vibration, the viscoelastic damping layer generates shear deformation along with vibration of the coil body and the insulation structure body, vibration mechanical energy is converted into heat energy through the viscoelastic material to be dissipated, and meanwhile axial and radial vibration reduction is conducted on the coil body. The structure is simple, the cost is lower, and radial and axial vibration reduction and fatigue resistance of the pulse magnet coil can be considered.

The invention discloses an energy-absorbing, vibration-reducing and noise-reducing high-speed railway viaduct vibration-reducing effect evaluation method, which comprises the following steps: S1, arranging force sensors and displacement sensors in a restraint layer, a base layer and a damping layer of a high-speed railway viaduct structure, and collecting normal stress of the force sensors and the displacement sensors in three-axis directions, shear stress of x-y, y-z and z-x planes and displacement of the force sensors and the displacement sensors in corresponding directions; s2, performing the following assumptions to calculate a loss factor: (1) the viscoelastic damping material satisfies a linear viscoelastic constitutive relationship; (2) the restraint layer and the base layer meet the plane assumption in the vibration process, namely, the deformation is uniform; (3) the influence of shear deformation and rotational inertia of the structure is neglected; s3, determining the circular frequency of the vibration mode and the first-order mode of the constraint damping structure; s4, calculating strain energy of the constraint layer, the damping layer and the base layer; s5, calculating dissipated energy of the damping layer; and S6, calculating a transverse loss factor and a vertical loss factor in the first-order mode.

The invention relates to the technical field of storage, and provides a storage device which comprises a driving structure and two tape reels, the driving structure comprises two power output shafts, each power output shaft is in transmission connection with one tape reel, and the power output shafts are used for driving the tape reels to rotate around the axes of the power output shafts; each tape reel is provided with a first surface and a second surface which are opposite in the axis direction of the power output shaft, at least one of the first surface and the second surface of at least one tape reel is provided with a damping structure, the damping structure comprises a damping material layer and a restraint layer, the damping material layer is fixedly connected with the tape reel, and the restraint layer is fixedly connected with the damping material layer. The restraint layer is attached to the surface, back to the tape reel, of the damping material layer, and the elastic modulus of the restraint layer is larger than that of the damping material layer. The storage device can effectively reduce vibration of the tape body on the tape reel.

This application relates to the technical field of vibration-damping and heat-insulating composite materials, and provides a vibration-damping and heat-insulating composite structure and process. The vibration-damping and heat-insulating composite structure includes multiple prefabricated units that collectively cover the outer perimeter of a pipe. Each prefabricated unit includes a constraint shell, a vibration-damping module, and a heat-insulating module, both of which are connected to the constraint shell. The vibration-damping module includes a damping layer and a constraint layer, with multiple damping and constraint layers alternately stacked from the inside out. This vibration-damping and heat-insulating composite structure can improve the covering efficiency of pipe covering materials.

The application discloses a tuned mass damper provided with constraint layer damping, which comprises a fixed part, an elastic connecting part and a mass part, wherein the mass part is connected with the fixed part through the elastic connecting part; the elastic connecting part is a thin-walled structure; at least one side of the elastic connecting part is paved with constraint layer damping; the constraint layer damping comprises more than one damping layer and more than one constraint layer, and the more than one damping layer and the more than one constraint layer are alternately stacked layer by layer. The tuned mass damper provided with the constraint layer damping can achieve the required rigidity and damping in the case of occupying a smaller space, and provides a better damping effect.

The invention relates to a structure / heat / vibration integrated design of a vehicle external display system, in particular to a CLD (confined layer damping) damping-heat conduction composite assembly part for a vehicle shell display screen. The assembly part is sequentially integrated from a display module side to a vehicle body side: a restraint layer A for in-plane heat conduction and diffusion, a viscoelastic damping layer B in shear coupling with the restraint layer A, a bearing restraint layer C forming heat / force bridging with the vehicle body, and a limiting / unloading component D for bypassing a load to a vehicle body bearing path during limited displacement or impact. Under the vehicle road spectrum and impact working condition, the vibration energy is preferentially sheared and dissipated at the B layer; working heat is diffused through the A-C layer and is exported; and the continuity of A / B / C is not damaged by triggering of D. Compared with the conventional scheme of single vibration isolation or single heat dissipation, the method gives consideration to the peak suppression stability and the heat management stability, and is suitable for the harsh outdoor environment of integrated display of the curved surface outer covering part.

A flexible circuit assembly and cover for a traction inverter system of an electric vehicle is provided. The flexible circuit assembly includes a flexible printed circuit body, a first connector, and a second connector. The flexible printed circuit body forms an angled shape having an inner side and an outer side. The cover includes an outer surface, an inner surface including ribs, and a perimeter configured to attach to the housing. The outer surface includes a central region, a first lateral region and a second lateral region, and a constraining layer damping material. The central region, the first lateral region, and the second lateral region form a profile, and the restraint layer damping material conforms to the profile.

Disclosed is a constrained layer damper component, comprising: a base layer having a lower surface and an upper surface; a constraining layer; a viscoelastic layer positioned between the base layer and the constraining layer; and a weakening feature arranged to provide a localized portion of the constrained layer damper component having a reduced bending stiffness compared to remaining portions of the constrained layer damper component.

The invention relates to a structure / heat / vibration integrated design of a vehicle external display system, in particular to a CLD (confined layer damping) damping-heat conduction composite assembly part for a vehicle shell display screen. The assembly part is sequentially integrated from a display module side to a vehicle body side: a restraint layer A for in-plane heat conduction and diffusion, a viscoelastic damping layer B in shear coupling with the restraint layer A, a bearing restraint layer C forming heat / force bridging with the vehicle body, and a limiting / unloading component D for bypassing a load to a vehicle body bearing path during limited displacement or impact. Under the vehicle road spectrum and impact working condition, the vibration energy is preferentially sheared and dissipated at the B layer; working heat is diffused through the A-C layer and is exported; and the continuity of A / B / C is not damaged by triggering of D. Compared with the conventional scheme of single vibration isolation or single heat dissipation, the method gives consideration to the peak suppression stability and the heat management stability, and is suitable for the harsh outdoor environment of integrated display of the curved surface outer covering part.

The invention relates to an anti-squeal pad for brake discs of a lightweight vehicle such as bicycles, scooters and possibly motorcycles and low-speed cars. The anti-squeal pad is attached to the brake disc, or the anti-squeal pad constitute an integrate part of the brake disc. The anti-squeal pad comprises a constrained layer damping (CLD) pad with at least one metallic layer and at least one viscoelastic layer for attaching the pad to a side surface of parts the brake disc or for inserting between parts of the brake disc. The invention also relates to a brake disc and to a disc brake assembly with such anti-squeal pad and to a vehicle with such disc brake assembly.

An improved constraining layer vibration-damping patch for use directly on a substrate having a rust-preventive coating. The improved constraining layer vibration-damping patch includes a constraining layer, a damping layer, and a release liner. The improved constraining layer vibration-damping patch includes a damping layer having about 10 to about 15 weight percent of a butyl rubber composition, about 1 to about 5 weight percent of a tackifier, about 20 to about 25 weight percent of a plasticizer, about 60 to about 65 weight percent of a filler, and about 0.01 to 1 weight percent of a colorant, wherein the composition is substantially free of a curative, and the composition is free of an ethylene copolymer.

This invention discloses a visual automatic frequency tracking vibration polishing machine, relating to the field of intelligent control of precision polishing equipment. The polishing machine includes an electromagnetic circular vibrating base, a material cylinder assembly, several inclined elastic springs, a housing assembly, an adjustable frequency and voltage vibration power supply, and a visual automatic frequency tracking module. The visual automatic frequency tracking module includes an image acquisition unit facing the liquid surface of the material cylinder, a supplementary lighting unit, a controller, and a communication interface connected to the vibration power supply. The controller dynamically adjusts the driving frequency and driving voltage based on the characteristics of the liquid surface image, enabling the polishing machine to operate stably at the optimal resonance point under the current load. Preferably, the elastic springs are made of bainitic steel; the housing assembly consists of a plastic shell, a silicone intermediate layer, and a metal base plate stacked to form a constraint layer damping structure. This invention overcomes the shortcomings of electrical feedback frequency tracking schemes in detecting abnormal sample-level movements, improving polishing consistency and efficiency.

The application provides a machine tool column structure optimization method based on finite element simulation, and relates to the technical field of machine tool column structure optimization.The application accurately defines the key laying area of the constraint layer damping which is most effective in inhibiting resonance according to the threshold screening and region growing algorithm in the inner wall of the column based on the identified risk resonance mode, the modal strain energy cloud diagram and the mode shape animation, and establishes a parameterized model to realize the coupling optimization of the thickness, so that the precise positioning and on-demand distribution of the damping laying are realized.The utilization efficiency and damping effectiveness of the damping material are fundamentally improved by concentrating the limited damping material in the local area with the most dense vibration deformation energy and strain energy, material waste and invalid weight increase are avoided, and in combination with the parameterized optimization, the design space for reducing the damping layer coverage area, reducing the cost and process complexity is provided under the premise of ensuring the dynamic performance.