One-dimensional periodic cushion vibration reduction ballast bed vibration isolation frequency band regulation and control design method

Abstract

The invention discloses a one-dimensional periodic cushion vibration reduction ballast bed energy band structure simplified calculation and vibration isolation frequency band design method. The methodstarts from a wave equation of continuous state parameters under assumed conditions of a one-dimensional infinite periodic structure and infinite extension of a ballast bed along a line direction, obtains a transfer matrix of a single period in combination with a section continuous condition, obtains an analytical solution of an energy band structure curve by introducing a periodic boundary condition, determines a vibration isolation frequency band according to a forbidden band distribution range, and obtains the change rule of the forbidden band and the vibration isolation frequency band along with geometry and material parameters through influence factor analysis, so that active regulation and control of the forbidden band and the vibration isolation frequency band are achieved. According to the invention, the one-dimensional periodic cushion vibration reduction ballast bed energy band structure calculation and vibration isolation frequency band design method has the beneficial effects that a theoretical basis is provided for design and engineering practice of a periodic vibration reduction ballast bed; and the method is small in calculation amount, clear in theoretical basis and convenient to use, the calculation result can completely meet the requirements of engineering design, and the method has wide applicability.

Description

technical field [0001] The patent of the present invention relates to the field of rail transit vibration reduction and noise reduction, in particular to a one-dimensional period cushion layer vibration reduction ballast bed vibration isolation frequency control design method. Background technique [0002] At present, rail vibration reduction measures widely adopt the method of reducing the support stiffness or increasing the vibration mass to control the environmental vibration. Such methods may cause abnormal wear of the wheel and rail under the condition of excessive vibration reduction or improper vibration reduction, resulting in rapid abnormal wear of equipment and parts. Normal damage will increase the maintenance and repair workload of the wheel-rail system, and even affect the stability and safety of driving. In addition, the existing track vibration reduction design lacks scientific frequency planning and comprehensive vibration reduction and isolation concepts, re...

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Problems solved by technology

At present, there are no engineering implementation cases of periodic vibration-reducing ballast bed based on the theory of periodic structural bandgap, so that there is neither engineering experience for reference nor scientific and systematic theoretical calculations to support the periodic vibration-reducing ballast bed.

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