• Title/Summary/Keyword: honeycomb structure

Search Result 226, Processing Time 0.025 seconds

Design of the Spur Gear with Honeycomb Lattice Structure and PBF Printing

  • Chul-Kyu Jin
    • Journal of the Korean Society of Industry Convergence
    • /
    • v.26 no.4_1
    • /
    • pp.529-536
    • /
    • 2023
  • In this study, the spur gear with honeycomb lattice structures are designed. The pitch diameter and body length of the spur gear are Ø93 mm and 104.0 mm, respectively. The designed gear was printed using Powder bed fusion (PBF) 3D printer. The gear is 3D printed perfectly. Even the teeth and honeycombs of the gear were output in the same way as the design shape. The printed gear with honeycomb lattice structure has a 24% smaller cross-sectional area and 29% smaller volume and weight than conventional solid structure gears. The surface roughness is approximately 4.5㎛, and the hardness is 345 HV.

A study on the improvement of sound absorption coefficient of an honeycomb panel by the core resonance (코어공명을 이용한 허니콤패널의 흡음율 개선에 관한 연구)

  • Yu, Y.H.
    • Journal of Power System Engineering
    • /
    • v.12 no.4
    • /
    • pp.46-51
    • /
    • 2008
  • Honeycomb panel has a constructive advantage because it is constructed with a honeycomb core, so it has relatively higher strength ratio to weight. Therefore honeycomb panel has been used as the light weight panels in the high-speed railway technology and high-speed ship like as cruise yachts. Also it has been used in the aircraft and aerospace industry as a structural panel because light weight structure is indispensible in that field of industry. Recently, the honeycomb panel is embossed in the viewpoints of high oil prices as the lightweight panel of the transport machine, however the sound insulation capacity of the honeycomb panel is poorer than those of uniform and another sandwich panels. In this paper a method to improving the sound absorption coefficient of a honeycomb panel Is studied by using the Helmholtz resonator. The sound absorption coefficients for some kinds of honeycomb cores are demonstrated by the normal incident absorption coefficient method.

  • PDF

FEM Analysis of Smart Skin Structure Specimen (스마트 스킨 구조물 시편의 유한요소 해석)

  • 전지훈;황운봉
    • Composites Research
    • /
    • v.16 no.4
    • /
    • pp.59-65
    • /
    • 2003
  • FEM analysis of the smart skin structure, and application of the sandwich structures investigated. The honeycomb manufactures only provide stillness of thickness direction and transverse shear modulus. Although these are dominant mechanical properties. the other mechanical properties are needed in FEM analysis. Hence, this work shows procedures of obtaining those mechanical properties. Honeycomb material was assumed to be ar, isotropic material and properties are estimated by its dominant honeycomb properties. The other honeycomb properties are then obtained by mechanical properties of Nomex. Buckling test and three point bending test were simulated by ABAQUS. Both the shell and solid element models were used. The results were compared with experimental results and analytical approaches. They showed good agreements. This study shows a guideline of FEM analysis of smart skin structure using commercial a FEM package.

Fatigue Fracture Assessment of Honeycomb Composite Side-Wall Panel Joint for the KTX Tilting Car Body (틸팅차량용 KTX 차체의 하니컴복합재 측벽판 체결부의 피로파괴평가)

  • Jeong, Dal-Woo;Kim, Jung-Seok;Choi, Nak-Sam
    • Transactions of the Korean Society of Mechanical Engineers A
    • /
    • v.34 no.1
    • /
    • pp.55-60
    • /
    • 2010
  • The honeycomb composite joint structure designed for application to a tilting KTX railroad car body is subjected to bending loads of a cantilever type. Honeycomb sandwich composite panel-joint attached in the real tilting car body was fabricated and sectioned as several beam-joint specimens for the bending test. The fracture behaviors of these specimens under static loads were different from those under cyclic loads. Static bending loads caused shear deformation and fracture in the honeycomb core region, while fatigue cyclic bend loading caused delamination along the interface between the composite skin and the honeycomb core, and/or caused a fracture in the welded part jointed with the steel under-frame. These fracture behaviors could occur in other industrial honeycomb composite joints with similar sub-structures, and be used for improving design parameters of a honeycomb composite joint structure.

Research on the Transmission Loss Analysis of the Honeycomb Structure's Floor Section (허니콤 구조물을 갖는 차체 바닥의 투과손실 해석기법 연구)

  • Kim, Kwan-Ju;Kim, Sang-Su;Park, Jin-Kyu
    • Journal of the Korean Society for Railway
    • /
    • v.11 no.1
    • /
    • pp.1-6
    • /
    • 2008
  • Sound transmission characteristics are investigated on the test specimen for the railway vehicle's floor section. Transmission loss on the honeycomb structure has been examined experimentally with the reverberation chamber. Predicted transmission loss values using NASTRAN, AUTOSEA2, are compared with measured Haloes and the effect of resonance on the transmission loss is identified. Transmission loss of different shapes of honeycomb structure are predicted.

A Study on the Disbonding Detection of FRP Honeycomb Sandwich Structure by Ultrasonic Methods (초음파를 이용한 복합재료 하니캄 구조물의 Disbonding 검출에 관한 연구)

  • Cho, K.S.;Lee, J.S.;Lee, J.O.;Chang, H.K.;Lee, S.H.
    • Journal of the Korean Society for Nondestructive Testing
    • /
    • v.11 no.1
    • /
    • pp.23-30
    • /
    • 1991
  • In this study the bonding quality evaluation of FRP honeycomb structure was performed by the ultrasonic C-Scan method and stress wave factor measurements. These NDT techniques could be well applied to the disbonding detection of FRP honeycomb structures. Especially, stress wave factor (SWF) measurement is expected to be a useful technique in field applications.

  • PDF

Evaluation of the Sound Transmission Loss of a Light Weight Honeycomb Structure (정량구조물의 차음성능 향상방안 : ″Honeycomb 구조의 적용사례″)

  • 김운경;김정태;김석현
    • Proceedings of the KSR Conference
    • /
    • 2002.05a
    • /
    • pp.446-451
    • /
    • 2002
  • Honeycomb structures have advantages in weight reduction with stiffness increment. As far as noise is concerned, however a light aluminum structure, instead of a steel frame, should have an equivalent mass density in order to maintain sound insulation performance. In this paper, an evaluation of a material effect on noise has been examined.

  • PDF

LOCAL WELL-POSEDNESS OF DIRAC EQUATIONS WITH NONLINEARITY DERIVED FROM HONEYCOMB STRUCTURE IN 2 DIMENSIONS

  • Lee, Kiyeon
    • Bulletin of the Korean Mathematical Society
    • /
    • v.58 no.6
    • /
    • pp.1445-1461
    • /
    • 2021
  • The aim of this paper is to show the local well-posedness of 2 dimensional Dirac equations with power type and Hartree type nonlin-earity derived from honeycomb structure in Hs for s > $\frac{7}{8}$ and s > $\frac{3}{8}$, respectively. We also provide the smoothness failure of flows of Dirac equations.

Pumping speed of a sputter ion pump with a honeycomb anode cell structure (벌집형 셀 구조를 가지는 스퍼터 이온펌프의 성능 분석)

  • Ha, T.;Ahn, B.;Lee, D.;Kim, J.;Chung, S.
    • Journal of the Korean Vacuum Society
    • /
    • v.15 no.5
    • /
    • pp.451-457
    • /
    • 2006
  • We measured pumping speed of a sputter ion pump with a honeycomb anode cell structure and compared the result with that of another sputter ion pump with a typical cylindrical anode cell structure. A cell module with a honeycomb structure has no dead space which is about 10 % of the entire horizontal area of the cell module with a cylindrical structure. This dead space makes a little contribution to the ionization of the gas, so the pumping performance of the pump with dead space is expected to be lowered by the amount. From the experimental data we concluded that the honeycomb cell structure is superior to the cylindrical structure by $5{\sim}10%$ in performance.

Modal Analysis of Sandwich Plate Structure Considering Buckling (좌굴을 고려한 샌드위치형 판 구조물의 모드해석)

  • Han, Geun-Jo;Ahn, Chan-Woo;Ahn, Seong-Chan;Hong, Do-Kwan;Han, Dong-Seop
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.19 no.6
    • /
    • pp.104-108
    • /
    • 2002
  • Sandwich plate structure is widely used in various fields of industry due to its excellent strength and stiffness compared with weight. In this paper, the mechanical behavior of sandwich plate structure with honeycomb core considering buckling is investigated in detail. The focus of the analysis is to evaluate strength and stiffness of the plate structure with critical stress, natural frequency, and mode shapes. The results of this investigation are obtained from detailed finite element analysis for various parameters, such as length, height ratio, and thickness ratio of honeycomb core.