Design relation and end correction formula for multi-orifice Helmholtz resonators with intrusions

Helmholtz resonators are used to control low-frequency noise in cavities. One of the ways to reduce the resonance frequency of a resonator without changing its volume is to introduce an intrusion. Similarly, the introduction of multiple orifices can increase the resonance frequency without changing the resonator volume. These features provide an ability to accommodate slight changes in the cavity/enclosure frequencies during the design process. However, one has to rely on extensive three-dimensional finite element or boundary element simulations to predict the resonator characteristics with the introduction of these features. To reduce the computational burden, a design relation, between the first resonance frequency of a single orifice intruded resonator with that of a multi-orifice intruded resonator, is proposed in this paper. In developing this design relation, the total cross-sectional area of the resonator with multiple orifices is the same as that of the single orifice resonator. It is shown that this design relation is independent of the shape/size of the orifices and resonator cavity. Using this relation, a new end correction formula for the orifice lengths of multi-orifice intruded resonators has been proposed. The end correction formula can be used to calculate the reactance of multi-orifice intruded Helmholtz resonators analytically. These expressions are derived by carrying out extensive simulations of the resonators using the boundary element method. Limited experiments have been carried out to validate the proposed approach. The use of these expressions will reduce the computational cost of simulating cavities embedded with resonators as one can avoid modeling the resonators and use impedance boundary conditions instead.

Adaptable Product Platform-Based Product Family Design of Crane

A new design method for product family was presented based on adaptable product platform. Firstly, customer demands were analyzed for bridge crane. Secondly, axiomatic design was utilized as framework to zigzaging mapping between functional requirements and design parameters, and design matrix was established. Then the sensitivity analysis among design parameters and between design parameters and functional requirements was done. The design relation matrix was established and relation degree among design parameters was calculated. Based on above analysis, the platform parameters were identified.

PELA SEBAGAI SARANA PENYELESAIAN KONFLIK ANTARA SUKU ALUNE DAN WEMALE DI KABUPATEN SERAM BAGIAN BARAT PROPINSI MALUKU

Research about “Pela” as faulity solution conflict berween villages on Tribe Alune and Wemale in district Kairatu, Wets Seram, with aim to giving description all at once input for peoples. Gevernment and sympathy of law in this area about important Constribution Pela on regulatury living people. This research do that on four village whose have design relation its clear, that is : village Tihulale with village Hukuanakota and village Rambatu with Village Abio. The Research Object head of people, Figure Customs, Figure of peoples and people member. The method of research characteristic is descriptive analyse and analyse of data do qualitative. From analyse product have a concluded that “Angkat Pela and Panas Pela” to make resemble two faulity important which until now. This enough to give Constribution whose to signify for people a finished several conflict which rise. From “Angkat Pela and Panas Pela” the people can find conscious self to always look after, to make care and system of life that fixed, save and peace.