Papers by Mehmet CALISKAN
Conference Proceedings of the Society for Experimental Mechanics Series, 2016
Antenna structures used in electronic warfare, radar, naval, satellite, spacecraft systems encoun... more Antenna structures used in electronic warfare, radar, naval, satellite, spacecraft systems encounter mechanical shock from various sources such as near miss under water explosion, pyrotechnic and ballistic shocks. Since most of the antenna structure has larger dimension in longitudinal direction and experience high frequency, high amplitude shock energy, geometric nonlinearity become crucial to predict dynamic behavior in real life. In this study, the antenna structure is modeled by Euler-Bernoulli beam theory including geometrical nonlinearity. The resulting partial differential equations of motion are converted into a set of nonlinear ordinary differential equations by using Galerkin’s Method, which are solved by Newmark. The results for the linear system obtained from time integration and approximate methods such as Absolute Method, Naval Research Method, and Shock Response Spectrum Method (SRS) are compared to the nonlinear ones. Moreover, these results are compared with the ones obtained from commercial Finite Element software.
Bookmarks Related papers MentionsView impact
Proceedings of the ICA congress, 2019
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
The Journal of the Acoustical Society of America
This paper is about testing a variable acoustic system proposal under development in a real case.... more This paper is about testing a variable acoustic system proposal under development in a real case. The variable acoustic system is designed as alternating slot panels and prototyped via using Arduino and Processing. Digital interface to control the system is designed in Processing and via Arduino board digital commands are converted to physical movements. After the possibility of construction of variable perforated panel system is simply clarified, perforated panels of the system are produced via CNC routers. Panel positions are defined regarding perforation characteristics in terms of slot width and distances between slots. Changing these parameters is linked to perforation ratio of the system, while air gap and porous material behind are kept unchanged. Sound absorption capabilities of variable perforations are examined with Impedance tube measurements. Measurement results of variable slot panels, as a promising variable acoustic system, are transferred to ODEON room acoustics software, to assess the sys...
Bookmarks Related papers MentionsView impact
There is a dispersion of professional expertise in building industry since demand for rapid, deta... more There is a dispersion of professional expertise in building industry since demand for rapid, detailed and correct information has been increased with the developing technology. According to their expertise, the actors in a project may share technical, organizational, financial information about their specific discipline or even guide other actors for the benefit of the project. Architects who combine all the information gathered from various actors should at least own basic knowledge about other disciplines to communicate with these actors. Moreover, this knowledge is also essential to take befitting decisions in every design step. Acoustics is one of the major knowledge areas in the architectural projects. University education is important to build up this knowledge. This paper will discuss the role of acoustics courses in architectural education, question a pair of teaching methods and present the outcomes of acoustics education in the professional life of architects through the c...
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
The Journal of the Acoustical Society of America, 2016
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
ABSTRACT The study deals with investigation of acoustical characteristics of a hybrid silencer ma... more ABSTRACT The study deals with investigation of acoustical characteristics of a hybrid silencer made up of a dissipative silencer and a quarter wave tube resonator. Experimental analyses are performed to define acoustical characteristics of a simple expansion chamber, reactive and dissipative perforated silencer. Furthermore, the experiments are extended to the hybrid silencer to determine the effect of quarter wave tube resonator on the silencer performance. Experimental results of the dissipative silencer are verified with theoretical solutions. The results found with experimental results are found to compare to analytical and numerical results favorably. PACS no. 43.50.+y, 43.58.+z
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
ABSTRACT Multiple domed superstructures with different volumetric and material attributes are pre... more ABSTRACT Multiple domed superstructures with different volumetric and material attributes are previously investigated using in-situ acoustical measurements and acoustical simulation methods for analyzing their contributions to multi-slope energy decay formation. Relevant acoustical parameters including decay rates and decay times are computed by applying the Bayesian decay analysis. Initial results indicate double- or triple-slope decay characteristics for specific measurement configurations for selected cases. The ongoing research is aimed at explaining the probable reasons of multiple decay formation as observed in such single space enclosures. Diffusion equation modeling (DEM) and intensity probe measurements are utilized to observe spatial sound energy distributions and energy flow vectors. Both computed and measured flow vectors indicate the contribution of central dome to the later energy feedback. For a specific case the trial by DEM over virtual model with floor with marble instead of carpet resulted in a centrally concentrated energy, as a result preventing the multi-slope formation. The results support the argument that non-diffuse sound fields due to geometrical and material characteristics of superstructures provide the circumstances for non-exponential energy decay formation.
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
ABSTRACT
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
ABSTRACT
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Uploads
Papers by Mehmet CALISKAN