To improve the impact sound insulation performance of building floors and meet the objective requirements for living comfort of residents,in this article,three kinds of elastic cushion materials,Portuguese cork board,...To improve the impact sound insulation performance of building floors and meet the objective requirements for living comfort of residents,in this article,three kinds of elastic cushion materials,Portuguese cork board,BGL insulation sound insulation foam board,and EPP polypropylene plastic foam board,are applied to the sound insulation of a light frame wood floor structure of the same bedroom and compared to the ordinary floor.This study uses the transfer function method and transient excitation method to measure the sound insulation,damping ratio,and elastic modulus of materials,as well as the sound insulation of the floor under the jumping excitation method of daily behavior.Through comparative analysis,the results and factors of improving the sound insulation performance of the floor are obtained,according to which three types of elastic cushion materials and the floor covering composed of them have higher vibration and noise reduction performance.Among them,the overall sound insulation performance of BGL board floor is the highest,followed by EPP board and cork board floor,and ordinary OSB floor is the lowest.Under the jumping excitation method,three floating floors can improve the impact sound insulation performance of the middle and low-frequency bands.展开更多
Continuous jumping behavior,a kind of endurance locomotion,plays important roles in insect ecological adaption and survival.However,the methods used for the efficient evaluation of insect jumping behavior remain large...Continuous jumping behavior,a kind of endurance locomotion,plays important roles in insect ecological adaption and survival.However,the methods used for the efficient evaluation of insect jumping behavior remain largely lacking.Here,we developed a locomotion detection system named JumpDetector with automatic trajectory tracking and data analysis to evaluate the jumping of insects.This automated system exhibits more accurate,efficient,and adjustable performance than manual methods.By using this automatic system,we characterized a gradually declining pattern of continuous jumping behavior in 4th‐instar nymphs of the migratory locust.We found that locusts in their gregarious phase outperformed locusts in their solitary phase in the endurance jumping locomotion.Therefore,the JumpDetector could be widely used in jumping behavior and endurance locomotion measurement.展开更多
基金This study was funded by Co-Innovation Center of Efficient Processing and Utilization of Forest Resources(Nanjing Forestry University,Nanjing,210037,China).
文摘To improve the impact sound insulation performance of building floors and meet the objective requirements for living comfort of residents,in this article,three kinds of elastic cushion materials,Portuguese cork board,BGL insulation sound insulation foam board,and EPP polypropylene plastic foam board,are applied to the sound insulation of a light frame wood floor structure of the same bedroom and compared to the ordinary floor.This study uses the transfer function method and transient excitation method to measure the sound insulation,damping ratio,and elastic modulus of materials,as well as the sound insulation of the floor under the jumping excitation method of daily behavior.Through comparative analysis,the results and factors of improving the sound insulation performance of the floor are obtained,according to which three types of elastic cushion materials and the floor covering composed of them have higher vibration and noise reduction performance.Among them,the overall sound insulation performance of BGL board floor is the highest,followed by EPP board and cork board floor,and ordinary OSB floor is the lowest.Under the jumping excitation method,three floating floors can improve the impact sound insulation performance of the middle and low-frequency bands.
基金This work was supported by the National Natural Science Foundation of China(Grant No.31772531 and 31601875)the Strategic Priority Program of CAS(Grant No.XDB11010000).
文摘Continuous jumping behavior,a kind of endurance locomotion,plays important roles in insect ecological adaption and survival.However,the methods used for the efficient evaluation of insect jumping behavior remain largely lacking.Here,we developed a locomotion detection system named JumpDetector with automatic trajectory tracking and data analysis to evaluate the jumping of insects.This automated system exhibits more accurate,efficient,and adjustable performance than manual methods.By using this automatic system,we characterized a gradually declining pattern of continuous jumping behavior in 4th‐instar nymphs of the migratory locust.We found that locusts in their gregarious phase outperformed locusts in their solitary phase in the endurance jumping locomotion.Therefore,the JumpDetector could be widely used in jumping behavior and endurance locomotion measurement.
