排序方式： 共有3条查询结果，搜索用时 0 毫秒
1
1.
2.
An Oscillating Water Column (OWC) device can output energy through reciprocating or unidirectional airflow. The unidirectional airflow is helpful to utilize a simple and high-efficiency unidirectional air turbine. The pentagonal BBDB proposed by us based on OWC principle can be regarded as a floating Oscillating Body and its Power Take-Off (PTO) consists of a chamber, a water column, a turbine and a generator. The Capture Width Ratio (CWR) of the pentagonal BBDB model with the reciprocating and unidirectional airflow was studied in this paper. The wave flume test results indicate the mean CWR of the pentagonal BBDB model with reciprocating airflow can reach up to 121.91% and the mean CWR of the model with unidirectional airflow could reach 100.94% during the whole wave cycle in regular waves. For irregular waves, the mean CWR of the model with the unidirectional airflow is as high as 62.83% during the whole wave cycle. Hopefully, the combination of the pentagonal BBDB with the check valve to output power during the air exhalation and conventional high-efficiency unidirectional turbine will improve the total efficiency of the BBDB. 相似文献
3.
A large-scale 20.5 m long asymmetric two-span reinforced concrete bridge was tested to failure using the shake table system
at the University of Nevada Reno. Upon completion of testing, in depth analytical modeling was conducted to evaluate the accuracy
of conventional methods in reproducing the bridge model response and to develop a model for further study. Utilizing the experimentally
verified computer model, the system effect was investigated, comparing the system and response of individual bents as well
as the response of several other bridge models. In comparing computational model of the shake table specimen and models of
the individual bents with tributary mass, it was shown that for all of the columns in this study, there was generally not
an increase in hysteretic energy or large displacement cycles from system response at given displacement demand. The response
of the bents for each high amplitude test motion was also compared. It was shown that there were significant differences in
the bent demands for a given excitation due to system effects. In addition to the shake table model, four bridge systems with
a constant total lateral stiffness were used in a parametric study to determine the system effect. The symmetric and uniform
versions of the bridge specimen were shown to be comparable in nonlinear performance to the bridge specimen for the same high
amplitude demand. The failure progression of the bridge model and the analytical comparisons suggested that the reserve capacity
from varied column heights could provide a beneficial substructure redundancy. 相似文献
1