An example of using ultrasonic method to detect the compactness of complicated concrete-filled steel tube in certain high-rise building was discussed in this study.Because of the particularity of the complicated concr...An example of using ultrasonic method to detect the compactness of complicated concrete-filled steel tube in certain high-rise building was discussed in this study.Because of the particularity of the complicated concrete-filled steel tubular column,the plane detection method and embedded sounding pipe method were adopted in the process of effectively detecting the column.According to the results of the plane detection method and embedded sounding pipe method,the cementing status of steel tube and concrete can be concluded,which cannot be judged by the hammering method in the rectangular steel tube-reinforced concrete.展开更多
In this paper, propagation of sound in pipes under the influence of a gas flow of high temperature is investigated . The analysis in the paper is based on the fundamental equations of fluid mechanics . Approximate for...In this paper, propagation of sound in pipes under the influence of a gas flow of high temperature is investigated . The analysis in the paper is based on the fundamental equations of fluid mechanics . Approximate formulas of the variation of parameters, such as the static tempera -ture, the local velocity of sound , the flow speed and the Mach number, with distance are obtained . The four parameters transmision matix which determines the acoustical character of the pipe is derived and discussed . The acoustical character of a pulsating gas heater is investigated experimentally and theoretically . The theoretical values of the resonant frequencies of the device are in good agreement with the experimental results.展开更多
文摘An example of using ultrasonic method to detect the compactness of complicated concrete-filled steel tube in certain high-rise building was discussed in this study.Because of the particularity of the complicated concrete-filled steel tubular column,the plane detection method and embedded sounding pipe method were adopted in the process of effectively detecting the column.According to the results of the plane detection method and embedded sounding pipe method,the cementing status of steel tube and concrete can be concluded,which cannot be judged by the hammering method in the rectangular steel tube-reinforced concrete.
文摘In this paper, propagation of sound in pipes under the influence of a gas flow of high temperature is investigated . The analysis in the paper is based on the fundamental equations of fluid mechanics . Approximate formulas of the variation of parameters, such as the static tempera -ture, the local velocity of sound , the flow speed and the Mach number, with distance are obtained . The four parameters transmision matix which determines the acoustical character of the pipe is derived and discussed . The acoustical character of a pulsating gas heater is investigated experimentally and theoretically . The theoretical values of the resonant frequencies of the device are in good agreement with the experimental results.
