Phân tích trường ứng suất cơ học tác dụng lên các chi tiết động cơ diesel sau khi tăng áp sử dụng

NGHIEN CU'U-TRAO DOI

PHAN TiCH TRU'O'NG U'NG SUAt CO HOC TAC DUNG LEN

CAC CHI TIET DONG CO DIESEL SAU KHI TANG AP SLP

DUNG PHA N M£ M CATI A

THE MECHANICAL LOAD ANALYSIS OF A TURBOCHARGED DIESEL

ENGINE USING CATIA SOFTV^ARE

Nguyen Tien Han

Khoa Cong nghfi 6 to, Truong Dai hgc Cong nghifip Ha Ngi

TOM TAT

Phuang phdp phdn tir hiru hgn dang duac cdc nhd khoa hgc trin the gioi su dung rgng rdi

cho viec phdn lich tdi trgng ca hgc vd tdi trgng nhiit tdc dung lin cdc chi tiit cua hi ca khi. Bdi bdo

ndy trinh bdy ket qud nghien ciru ve tdi trgng tdc dgng len cdc chi tiit cda mgt dgng ca D243 sau

khi dug'c tdng dp. Ket gud phdn tich dugc so sdnh vai dgng ca nguyen thuy de ldm ca sd" ddnh gid

do ben hogt dgng khi md tdi trgng ca hgc vd nhiit hgc tdng len sau khi tdng dp. Nghien cuu dd chi

ra rdng, img sudt tdc dung lin cdc chi tiet quan trgng cua dgng ca nhu thanh truyen, piston vd ndp

xylanh tdng ddng ki sau khi viec tdng dp ducrc thuc Men. Ngodi ra, img sudt ndy cUng thay doi theo

che do ldm viic vd theo goc quay tnic khuyu cda dgng ca. Ket qud ciia nghien ciru la nin tdng cho

viec dp dung phuong phdp phdn tir hiru hgn cho viic thiet ke tinh todn cdc he thong ca khi thay cho

cdc phuong phdp thuc nghiim ton kem vd kho thuc hiin trong thuc ti.

Tir khoa: Ndp mdy dgng ca; Tdi trgng nhiet vd tdi trgng ca khi; Dgng ca dot trong; Phuang

phdp phdn tuhitu hgn; Chia luai phdn tu.

ABSTRACT

The finite element method has been worldwide applied by scientists to analyze the thermal

and mechanical stresses of the engine parts. This paper aims to study the stresses on the important

components ofthe D243 test engine after retrofitting a turbocharger, including cylinder head, piston

and rob. Consequently the stresses on the parts of turbocharged engine are compared with those of

the original engine to evaluate its reliability using finite element method. The results ofthe thermal

and mechanical analyses indicated that the maximum stresses occurring the areas of combustion

chambers and they also increased dramatically after turbochargingfor the test engine. These also

change according to the engine firing order and load. The findings of this research show a simple

and cheap progress to determine the lifetime of mechanical parts through finite element analysis

instead of experimental tests, which are so difficult to conduct when designing mechanical system.

Keywords: Cylinder head. Mechanical and thermal stresses. Internal combustion engine,

Finite Element Method, Mesh generation.

ISSN 0866 - 7056

TAP CHf CO KHi VIET NAM, S6 6 nam 2017

www.cokhivietn am.vn