Multi-directional broadband tuned mass damper and design method thereof
Disclosed are a multi-directional broadband tuned mass damper and a design method thereof, since a first damping structure and a second damping structure are set on a rigid vibration damping frame, and the first damping structure is provided with a control main frequency, the second damping structure is provided with two control main frequencies, the control main frequency of the second damping structure is greater than that of the first damping structure; under the synergistic effect, the second damping structure mainly effectively broadens the control range for high frequencies, and a plurality of first damping structures control the control main frequency of a low frequency one-to-one, thereby controlling the full frequency, and the extension direction of the first damping structure is the same as that of the second damping structure on the rigid vibration damping frame, ensuring isotropic mass and stiffness distribution characteristics thereof; and furthermore, when using different control frequency ranges, the number and distribution of the first damping structure and the second damping structure, as well as the corresponding mass ratio and damping ratio can be pre-designed, so as to adapt to different control requirements.
1 . A multi-directional broadband tuned mass damper, comprising: a rigid vibration damping frame ( 1 ), and two ends of the rigid vibration damping frame ( 1 ) in a length direction are configured to connect to a sling,
wherein the rigid vibration damping frame ( 1 ) is provided with at least one first damping structures ( 2 ) and at least one second damping structures ( 3 ) distributed along the length direction at intervals, and an extension direction of the at least one first damping structure ( 2 ) is the same as that of an extension direction of the at least one second damping structure ( 3 );
wherein the at least one first damping structures ( 2 ) is provided with a control main frequency; the at least one second damping structures ( 3 ) is provided with two control main frequencies; and the control main frequencies of the at least one second damping structure ( 3 ) is higher than each control main frequency of the at least one first damping structure ( 2 );
wherein the at least one first damping structure ( 2 ) comprises a first steel strand ( 200 ) and a first mass block ( 201 ); one end of the first steel strand ( 200 ) is connected to the rigid vibration damping frame ( 1 ) by means of a connecting block ( 4 ), and the other end is connected to the first mass block ( 201 ); and
a formula of the control main frequency of the at least one first damping structure ( 2 ) is:
f
1
=
(
K
/
M
)
1
/
2
/
2
π
,
wherein K is a stiffness of the first steel strand ( 200 ), and M is a mass of the first mass block ( 201 );
wherein the first mass block ( 201 ) is provided with a first casting hole, and a part of the first steel strand ( 200 ) extending into the first casting hole is connected to the first mass block ( 201 ) by means of a first casting alloy in a casting manner.
2 . The multi-directional broadband tuned mass damper according to claim 1 , wherein
there are a plurality of the first damping structures ( 2 ) and a plurality of the second damping structures ( 3 ); and
the control main frequencies of the plurality of the first damping structures ( 2 ) are different; and the two control main frequencies of each second damping structure ( 3 ) are different, and the two control main frequencies of the plurality of second damping structures ( 3 ) are different.
3 . The multi-directional broadband tuned mass damper according to claim 2 , wherein
one second damping structure ( 3 ) is provided between two adjacent first damping structures ( 2 ); or
the rigid vibration damping frame ( 1 ) is provided with a first area and a second area in the length direction, all the first damping structures ( 2 ) are arranged in the first area, and all the second damping structures ( 3 ) are arranged in the second area.
4 . The multi-directional broadband tuned mass damper according to claim 1 , wherein
the at least one first damping structures ( 2 ) and the at least one second damping structures ( 3 ) are arranged on the rigid vibration damping frame ( 1 ) according to the control main frequencies from large to small or from small to large.
5 . The multi-directional broadband tuned mass damper according to claim 1 ,
wherein
the at least one second damping structure ( 3 ) comprises a second steel strand ( 303 ), a second mass block ( 300 ), a first rigid tube ( 301 ) and a third mass block ( 302 );
the second mass block ( 300 ) is coaxially connected to the third mass block ( 302 ) by means of the first rigid tube ( 301 ); a via hole is provided on the second mass block ( 300 ); one end of the second steel strand ( 303 ) is connected to the third mass block ( 302 ) through the via hole, and the other end is connected to the rigid vibration damping frame ( 1 ) by means of a connecting block ( 4 ); and
formulas of the two control main frequencies of the at least one second damping structure ( 3 ) are:
f
2
=
[
K
/
(
M
1
+
M
2
+
M
3
)
]
1
/
2
/
2
π
;
f
3
=
(
T
/
M
2
)
1
/
2
/
2
π
;
wherein K is a stiffness of the second steel strand ( 303 ), M 1 is a mass of the third mass block ( 302 ), and M 2 is a mass of the second mass block ( 300 ); and M 3 is a mass of the first rigid tube ( 301 ).
6 . The multi-directional broadband tuned mass damper according to claim 5 , wherein the third mass block ( 302 ) is provided with a second casting hole; and the part of the second steel strand ( 303 ) located in the second casting hole is connected to the third mass block ( 302 ) by means of a second casting alloy ( 309 ).
7 . A design method for the multi-directional broadband tuned mass damper according to claim 1 , comprising:
obtaining a target range of the control frequency, and obtaining a plurality of target control main frequencies;
comparing the plurality of the target control main frequencies with a set control main frequency; if the target control main frequency is less than the set control main frequency, taking the target control main frequency as a design parameter of the first damping structure ( 2 ); otherwise taking as a design parameter of the second damping structure ( 3 );
obtaining the number of the target control main frequency that is less than the set control main frequency; obtaining the number of the target control main frequency that is larger than or equal to the set control main frequency; and
manufacturing the first damping structure ( 2 ) and the second damping structure ( 3 ) based on the design parameter and number of the first damping structure ( 2 ) and the design parameter and number of the second damping structure ( 3 ), and installing on the rigid vibration damping frame ( 1 ).
8 . The design method for the multi-directional broadband tuned mass damper according to claim 7 , wherein when the installation space on a single rigid vibration damping frame ( 1 ) is less than a required installation space for all the first damping structures ( 2 ) and second damping structures ( 3 ), a plurality of identical rigid vibration damping frames ( 1 ) are additionally installed to install all the first damping structures ( 2 ) and second damping structures ( 3 ) on the sling.
9 . A multi-directional broadband tuned mass damper comprising: a rigid vibration damping frame ( 1 ), and two ends of the rigid vibration damping frame ( 1 ) in a length direction are configured to connect to a sling,
wherein the rigid vibration damping frame ( 1 ) is provided with at least one first damping structure ( 2 ) and at least one second damping structure ( 3 ) distributed along the length direction at intervals, and an extension direction of the at least one first damping structure ( 2 ) is the same as that of an extension direction of the at least one second damping structure ( 3 );
wherein the at least one first damping structure ( 2 ) is provided with a control main frequency; the at least one second damping structure ( 3 ) is provided with two control main frequencies; and the control main frequencies of the at least one second damping structure ( 3 ) are higher than each control main frequency of the at least one first damping structure ( 2 );
wherein the at least one second damping structure ( 3 ) comprises a second rigid tube ( 304 ) and a third steel strand ( 305 ); a bottom part of the second rigid tube ( 304 ) is provided with a sealing bottom plate ( 308 ); and
wherein the third steel strand ( 305 ) extends into the second rigid tube ( 304 ), and is connected to the second rigid tube ( 304 ) by means of a fifth mass block ( 311 ); and a fourth mass block ( 306 ) is coaxially fixedly connected to an outside of the second rigid tube ( 304 ).
10 . The multi-directional broadband tuned mass damper according to claim 9 , wherein
the fifth mass block ( 311 ) is provided with several water holes ( 310 ) arranged along the length direction of the third steel strand ( 305 ); and the bottom part of the water hole ( 310 ) passes through the sealing bottom plate ( 308 ).
11 . A multi-directional broadband tuned mass damper comprising: a rigid vibration damping frame ( 1 ), and two ends of the rigid vibration damping frame ( 1 ) in a length direction are configured to connect to a sling,
wherein the rigid vibration damping frame ( 1 ) is provided with at least one first damping structure ( 2 ) and at least one second damping structure ( 3 ) distributed along the length direction at intervals, and an extension direction of the at least one first damping structure ( 2 ) is the same as that of an extension direction of the at least one second damping structure ( 3 );
wherein the at least one first damping structure ( 2 ) is provided with a control main frequency; the at least one second damping structure ( 3 ) is provided with two control main frequencies; and the control main frequencies of the at least one second damping structure ( 3 ) are higher than each control main frequency of the at least one first damping structure ( 2 );
wherein the at least one second damping structure ( 3 ) comprises a second rigid tube ( 304 ) and a third steel strand ( 305 ); a bottom part of the second rigid tube ( 304 ) is provided with a sealing bottom plate ( 308 ); and
wherein the third steel strand ( 305 ) extends into the second rigid tube ( 304 ), and is connected to the second rigid tube ( 304 ) by means of a fifth mass block ( 311 ); and a fourth mass block ( 306 ) is coaxially fixedly connected to an outside of the second rigid tube ( 304 ); and a diameter of the sealing bottom plate ( 308 ) is equal to an outer diameter of the fourth mass block ( 306 ), and is connected to a bottom part of the fourth mass block ( 306 ) by means of a third rigid tube ( 307 ).
12 . The multi-directional broadband tuned mass damper according to claim 10 , wherein
the fifth mass block ( 311 ) is a third casting alloy that connects the second rigid tube ( 304 ) and the third steel strand ( 305 ) in a casting manner.