在认真研究LOCO-I算法的基础上,深入分析了失真控制参数Near对图像压缩比和重建质量的影响,通过对该算法中的Near进行实时动态调整,实现了对图像近无损压缩的压缩比控制,进而可以根据需求来控制图片大小进行压缩。仿真结果表明,提出的...在认真研究LOCO-I算法的基础上,深入分析了失真控制参数Near对图像压缩比和重建质量的影响,通过对该算法中的Near进行实时动态调整,实现了对图像近无损压缩的压缩比控制,进而可以根据需求来控制图片大小进行压缩。仿真结果表明,提出的压缩比控制方案收敛性较好,输出码流稳定,在满足目标压缩比时重建图像质量较原一阶压缩比控制方案提高了0.5 d B左右。展开更多
Combined with the advantages and disadvantages of tuned liquid damper (TLD) and tuned mass damper (TMD),a double tuned liquid mass damper (TLMD) is proposed by replacing the rigid connection of TLD with the spring str...Combined with the advantages and disadvantages of tuned liquid damper (TLD) and tuned mass damper (TMD),a double tuned liquid mass damper (TLMD) is proposed by replacing the rigid connection of TLD with the spring structure.The motion equation of a single-degree-of-freedom structure with a TLMD attached at its top is found under harmonic excitation.Comparing the energy consumption and amplitude of primary structure with equal mass ratio TMD,it is found that the energy dissipation performance of TLMD is better in the effective phase region.The interaction process between TLMD and structure is analyzed,and the formula of phase deviation between the relative velocity of tank and the displacement of primary structure is deduced.By analyzing the influence of mass ratio,frequency ratio,damping ratio and water depth ratio on the damping effect,the results show that the frequency ratio and liquid depth ratio have great influence on the size and location of deep resonance peak,and the mass ratio and damping ratio have great influence on the width of the effective frequency band.The formula of equivalent damping ratio is proposed based on the principle of energy and it is found that the equivalent damping ratio is related to the phase deviation and change with the frequency ratio of the external excitation.展开更多
文摘在认真研究LOCO-I算法的基础上,深入分析了失真控制参数Near对图像压缩比和重建质量的影响,通过对该算法中的Near进行实时动态调整,实现了对图像近无损压缩的压缩比控制,进而可以根据需求来控制图片大小进行压缩。仿真结果表明,提出的压缩比控制方案收敛性较好,输出码流稳定,在满足目标压缩比时重建图像质量较原一阶压缩比控制方案提高了0.5 d B左右。
基金the National Natural Science Foundation of China(Nos.51578434 and 51378500)。
文摘Combined with the advantages and disadvantages of tuned liquid damper (TLD) and tuned mass damper (TMD),a double tuned liquid mass damper (TLMD) is proposed by replacing the rigid connection of TLD with the spring structure.The motion equation of a single-degree-of-freedom structure with a TLMD attached at its top is found under harmonic excitation.Comparing the energy consumption and amplitude of primary structure with equal mass ratio TMD,it is found that the energy dissipation performance of TLMD is better in the effective phase region.The interaction process between TLMD and structure is analyzed,and the formula of phase deviation between the relative velocity of tank and the displacement of primary structure is deduced.By analyzing the influence of mass ratio,frequency ratio,damping ratio and water depth ratio on the damping effect,the results show that the frequency ratio and liquid depth ratio have great influence on the size and location of deep resonance peak,and the mass ratio and damping ratio have great influence on the width of the effective frequency band.The formula of equivalent damping ratio is proposed based on the principle of energy and it is found that the equivalent damping ratio is related to the phase deviation and change with the frequency ratio of the external excitation.
