Car's Materials Acoustic Properties Test and Analysis

Liu, Yan; Zhang, Xiao Juan; Liu, Zong Cai

doi:10.4028/www.scientific.net/amr.785-786.1244

Cited by 3 publications

(3 citation statements)

References 1 publication

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“…The low frequency noises in the cab are difficult to be reduced by regular passive methods, such as sound-absorbing cotton and sound-sensitive materials. Liu et al 1 used PU and PTE materials to reduce the engine noise. The simulations show good absorption in high frequencies, but the results in the low frequency are not satisfied.…”

Section: Introductionmentioning

confidence: 99%

Vision-based driver ear recognition and spatial reconstruction

Peng

Liu

Jiang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part D:

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How to identify the ear hole more accurately and more quickly are critical for the active noise reduction in the road vehicle. Obscurations, causing by the long hair, the earphone, and some kind of caps, make the spatial location and orientation of the driver’s ears almost impossible. To solve these two problems, a new method was proposed to replace the original image scaling detection by combining the Haar-like algorithm with the scale size of the variable detection window in the recognition process. A depth positioning camera is added to the ear recognition, which may offer more accurate point vectors for the driver’s two ear holes. A simplified spatial reconstruction model was developed to assist the search when the piercing was occluded. After calculating the image-camera-cab projection mapping relationship, only four feature points are enough for the model’s data requirement. The test results show that the detection Frame Per Second (FPS) was improved to 8.8, and the ear hole’s positioning error is less than 0.1 cm. The proposed system can locate ear holes even with 100% obscurations. The research may have potential application as a front-end subsystem for the active noise reduction and voice interaction systems, improving the quality of acoustic control in cars.

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Section: Introductionmentioning

confidence: 99%

Vision-based driver ear recognition and spatial reconstruction

Peng

Liu

Jiang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…SiC coating could be prepared by various techniques. Chemical vapour deposition (CVD) is suitable for preparing high-purity, high-density SiC material [2][3]. But due to the complexity of CVD process, a large number of defects such as pores, mosaicity and dislocation were found in SiC coating.…”

Section: Introductionmentioning

confidence: 99%

Study on the Cause and Control of Defects on Process of CVD SiC

Huo

Liu

et al. 2016

KEM

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CVD SiC material with many excellent physical and chemical properties was used widely in the field of aerospace as reflector materials. In addition, CVD SiC thin film materials because of its compact structure, high purity can also be used as precision optical components of semiconductor industry. But the CVD process is a complex chemical process and the reaction process is very time consuming. Research of chemical vapor deposition for preparing silicon carbide process mechanism is important significance for the expansion of the application of silicon carbide. In this paper, CVD SiC coatings were fabricated by the pyrolysis of methyltrichlorosilane (MTS) in hydrogen at a low pressure. XRD and EDS were used to characterize the component of intermediate. SEM was used to observe the surface morphology and microstructure of coatings. The results indicated that key problem to be solved is to control the growth rate of SiC for high quality deposition coating, while the growth rate is also affected by process parameters. To obtain the materials to meet the use requirements, the need for control of each parameter in the reaction process.

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“…Graphite has excellent thermal stability and conductivity. In recent years, more and more attention has been concentrated on scientific research and engineering application of the nuclear material, high temperature materials, electrode materials and other, CVD SiC which was with good chemical stability, high temperature stability and high thermal conductivity, etc., can be used for surface coating on graphite equipment to improve the antioxidant capacity of graphite materials [1][2].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of SiC Coating on Graphite Substrate

Huo

Chen

Liang

et al. 2014

KEM

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High thermal conductivity and dense SiC coating were fabricated by chemical vapor deposition (CVD) on surface of different graphite at temperature of 1100°C. The results indicated that the thickness of the coating influences the quality of coating. There was no crack in coating when thickness of the coating is less than 0.3mm. The structure of graphite affected the reaction badly. When the graphite is coarse and porous the reaction is chemical vapor infiltration (CVI) and the interface of coating and substrate isnt obvious. When the graphite is dense and smooth, the coating is covered in surface of graphite, the interface is found between the coating and substrate. Optical microscope and SEM were used to observe the surface and cross-section morphology and microstructure of coatings. It shown coating and substrate had a good combination and the deposited grains mainly showed equiaxed form with the crystallite size of 30 nm at 1100°C.

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Car's Materials Acoustic Properties Test and Analysis

Cited by 3 publications

References 1 publication

Vision-based driver ear recognition and spatial reconstruction

Vision-based driver ear recognition and spatial reconstruction

Study on the Cause and Control of Defects on Process of CVD SiC

Preparation and Characterization of SiC Coating on Graphite Substrate

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