of Technology, Mechanical Engineering Department Nguyen Tan Tien. Theory of Machine[r]
Trang 1HCM City Univ of Technology, Mechanical Engineering Department Nguyen Tan Tien
5 CÂN BẰNG MÁY
tảitrọngtnhgâynên)
ảnh hưởng đến các máy xung quanh, nếu cộng hưởng có thể phá hủy máy
Trang 2HCM City Univ of Technology, Mechanical Engineering Department Nguyen Tan Tien
Trang 3HCM City Univ of Technology, Mechanical Engineering Department Nguyen Tan Tien
m
r
0
≠ +
m M
m R
0 )
=mrω M m Rω
Pqt
→Ta n idĩamấtcânb ngtnh
Trang 4a
ω
HCM City Univ of Technology, Mechanical Engineering Department Nguyen Tan Tien
0
= G
rr
G
a
2
rr
1
rr m1
ω
2
m
kínhtươngứnglàr1, r2, thỏ mrr1=−m2rr2
0 2
1
2 2
+ +
+
=
M m m
r m r m
rG
r r r
=
=
2 2 2 2
2 1 1
ω
ω
r m P
r m P qt
qt r r
r r
0 2
=P a Pa
Mqt qt qt
Trang 5HCM City Univ of Technology, Mechanical Engineering Department Nguyen Tan Tien
0 ,
P
r r
0 ,
P
r r
0 ,
P
r r
R r
h
D
D
h <<
Trang 6HCM City Univ of Technology, Mechanical Engineering Department Nguyen Tan Tien
n mởn tcácvector b nkínhri Khitrụcquay vớivậ tốcg cω, cáckhối
r
=
1 P r
1 m
2
m
i m
i P r 2
P r
n P r 1
rr 2
rr i r r
n
rr
rr m
n m A
B
P
∑
∑
i
i G
m
r m r
r r
ra, , cânb ngvới ựcquá tnhlytâmdo
2
ω
r m
r
=
0 2
= +∑Pi mrω ∑mriω
0
= +∑mri r
hay
1 P r
1 m
2
m
i m
i P r 2
P r
n P r 1
rr 2
rr i r r
n
rr
rr m
n m A
B
P
0
= +
+
=
∑
∑
i
i G
m m
r m r m r
r r
r
∑mrri
khốilượngm′i đ t ạicácmútvector b nkínhrr′i saocho mrr=∑m′rri′
Trang 7HCM City Univ of Technology, Mechanical Engineering Department Nguyen Tan Tien
1
2
Ưuđiểm: thiếtbịđơngiả , rẻtiề , ễthựchiệ
-Ứngvớivịtríi, tađ tmộtđ itrọngmitạimútvector b nkínhrsaochovật
1
2
3 4 5
6 7 8
rr mi
G
rr