Abstract: A sound absorber is configured as a rectangular hexahedral box and forms a porous double-layer Helmholtz resonance sound absorbing structure, at the same time, the sound absorber in the form of a box forms a structural resonance sound absorbing device itself, and the first-order natural mode frequency of the device is identical to that of a wheel air chamber. When the box-type sound absorbing structure is assembled in a wheel, double functions of absorbing acoustic resonance of the wheel air chamber under the organic combination of Helmholtz resonance sound absorption and structural resonance sound absorption can be realized.

Abstract: The application relates to a wheel with a sound absorption device, wherein the sound absorption device is arranged in a wheel air chamber to reduce acoustic resonance, the sound absorption device comprises two resonance sound absorption structure units which are connected in parallel, a first sound absorption frequency band of a first resonance sound absorption structure unit and a second sound absorption frequency band of a second resonance sound absorption structure unit are adjacent to each other or partially overlap with each other, and the resonance frequency of the wheel air chamber is contained at the adjacent part of the first sound absorption frequency band and the second sound absorption frequency band or in the overlapping area of the first sound absorption frequency band and the second sound absorption frequency band.

Abstract: The present disclosure provides an open-air circulating pool for simulating ecological damage, and belongs to the technical field of simulation tests of ecological environment impact. The open-air circulating pool is provided with a set of devices for simulating natural ecological environments of different water quality and sediments, as well as changes in water bodies caused by a sea occupation project, discharge of a typical pollution source and a sudden leakage accident, so as to observe changing trends of an aquatic organism and an environmental element, and qualitatively and quantitatively determine a law of causality of damage. The set of devices includes an open-air wave-flow circulating pool, an additive injection apparatus and an ecological indicator sampling and detection apparatus.

Abstract: The present invention relates to a method for tracking, monitoring and evaluating ecological impacts of a channel project based on long-term time series satellite remote sensing data, belonging to the field of ecological environment protection. Created in view of limitations and deficiencies of existing monitoring and evaluation methods, the method includes: a process for long-term time series satellite remote sensing analysis of an ecological impact of a channel project, an analysis method for respectively evaluating erosion and deposition, shoreline and water area morphological changes at different research scales based on water body information extraction, and an analysis method for respectively tracking and monitoring engineering construction details, comparing engineering impact scope consistency and evaluating engineering implementation effects based on channel project identification.

Abstract: The present application relates to a wheel with a sound absorber, the sound absorber being mounted in a wheel air chamber to reduce acoustic resonance, wherein the sound absorber is configured as a flat hexahedral box resonator and fastened to a wheel hub through a band, a first positioning mechanism is provided between the hub and the box resonator to fix the relative positions of the hub and the box resonator, and a second positioning mechanism is provided between the box resonator and the band to fix the relative positions of the box resonator and the band. According to the technical solution of the present disclosure, the resonator is positioned and fixed more reliably on the wheel, and the wheel is simple and economical in manufacturing, and convenient and controllable in installation and operation.

Abstract: The present invention relates to a method for evaluating an ecological environmental impact of a channel project and countermeasures thereof based on mechanism analysis, belonging to the field of ecological environmental impact evaluation technologies. In view of limitations of an existing evaluation method and the void of related technologies, the method includes: a project construction verification and change analysis method, a method for analyzing a fine classification impact mechanism and countermeasures thereof, a method for establishing a multi-level comprehensive index system of ecological environmental impacts, a method for establishing a compliance evaluation index system of an ecological channel, a method for tracking, monitoring and evaluation based on long-term time series satellite remote sensing and a method for analyzing and evaluating a superimposed and cumulative impact model.

Abstract: The application relates to a wheel with a sound absorption device, wherein the sound absorption device is arranged in a wheel air chamber to reduce acoustic resonance, the sound absorption device comprises two resonance sound absorption structure units which are connected in parallel, a first sound absorption frequency band of a first resonance sound absorption structure unit and a second sound absorption frequency band of a second resonance sound absorption structure unit are adjacent to each other or partially overlap with each other, and the resonance frequency of the wheel air chamber is contained at the adjacent part of the first sound absorption frequency band and the second sound absorption frequency band or in the overlapping area of the first sound absorption frequency band and the second sound absorption frequency band.

Abstract: The present application relates to a sound absorber unit and a vehicle wheel having a sound absorber comprising at least one sound absorber unit or at least one sound absorber module which is composed of a plurality of sound absorber units as a whole. The sound absorber unit is constructed into a box body in a hexahedron shape, a three-layer Helmholtz resonance sound absorption structure with double holes and single holes combined is formed, and meanwhile, the sound absorber unit or the sound absorber assembly forms a structural resonance sound absorber. According to the application, the double-absorption wheel air chamber sound resonance function organically combining Helmholtz resonance sound absorption and structural resonance sound absorption can be realized.

Abstract: The present disclosure provides an open-air circulating pool for simulating ecological damage, and belongs to the technical field of simulation tests of ecological environment impact. The open-air circulating pool is provided with a set of devices for simulating natural ecological environments of different water quality and sediments, as well as changes in water bodies caused by a sea occupation project, discharge of a typical pollution source and a sudden leakage accident, so as to observe changing trends of an aquatic organism and an environmental element, and qualitatively and quantitatively determine a law of causality of damage. The set of devices includes an open-air wave-flow circulating pool, an additive injection apparatus and an ecological indicator sampling and detection apparatus.

Abstract: The present application relates to a wheel with a sound absorber, the sound absorber being mounted in a wheel air chamber to reduce acoustic resonance, wherein the sound absorber is configured as a flat hexahedral box resonator and fastened to a wheel hub through a band, a first positioning mechanism is provided between the hub and the box resonator to fix the relative positions of the hub and the box resonator, and a second positioning mechanism is provided between the box resonator and the band to fix the relative positions of the box resonator and the band. According to the technical solution of the present disclosure, the resonator is positioned and fixed more reliably on the wheel, and the wheel is simple and economical in manufacturing, and convenient and controllable in installation and operation.

Abstract: The present disclosure relates to a sound absorber and a wheel having the same. The sound absorber is configured as a rectangular hexahedral box and forms a porous double-layer Helmholtz resonance sound absorbing structure, at the same time, the sound absorber in the form of a box forms a structural resonance sound absorbing device itself, and the first-order natural mode frequency of the device is identical to that of a wheel air chamber. When the box-type sound absorbing structure is assembled in a wheel, double functions of absorbing acoustic resonance of the wheel air chamber under the organic combination of Helmholtz resonance sound absorption and structural resonance sound absorption can be realized.

Abstract: The present invention relates to a method for evaluating an ecological environmental impact of a channel project and countermeasures thereof based on mechanism analysis, belonging to the field of ecological environmental impact evaluation technologies. In view of limitations of an existing evaluation method and the void of related technologies, the method includes: a project construction verification and change analysis method, a method for analyzing a fine classification impact mechanism and countermeasures thereof, a method for establishing a multi-level comprehensive index system of ecological environmental impacts, a method for establishing a compliance evaluation index system of an ecological channel, a method for tracking, monitoring and evaluation based on long-term time series satellite remote sensing and a method for analyzing and evaluating a superimposed and cumulative impact model.

Abstract: The present invention relates to a method for tracking, monitoring and evaluating ecological impacts of a channel project based on long-term time series satellite remote sensing data, belonging to the field of ecological environment protection. Created in view of limitations and deficiencies of existing monitoring and evaluation methods, the method includes: a process for long-term time series satellite remote sensing analysis of an ecological impact of a channel project, an analysis method for respectively evaluating erosion and deposition, shoreline and water area morphological changes at different research scales based on water body information extraction, and an analysis method for respectively tracking and monitoring engineering construction details, comparing engineering impact scope consistency and evaluating engineering implementation effects based on channel project identification.