CN-122014792-A - Magnetorheological fluid control device with wide-range damping characteristic

CN122014792ACN 122014792 ACN122014792 ACN 122014792ACN-122014792-A

Abstract

The invention relates to a magnetorheological fluid control device with a wide-range damping characteristic, and belongs to the technical field of intelligent material control. The intelligent hydraulic control device comprises a double-outlet piston rod, a combined cylinder barrel, an excitation coil, an outer barrel, magnetorheological fluid, a multichannel current source and intelligent terminal equipment. The end parts of the double-outlet piston rods are connected to the device to be tested, and the middle square piston is matched with the shape of the combined cylinder barrel so as to push magnetorheological fluid to flow to form damping force. The combined cylinder is formed by welding and combining two magnetic-conducting first cylinder barrel pieces and two non-magnetic-conducting second cylinder barrel pieces, so that the magnetic field is uniformly controlled, the magnetorheological fluid obtains more accurate magnetic field control characteristics, and the damping force control effect is improved. The exciting coils are wound in the three grooves of the combined cylinder barrel, and the current sizes of the three groups of coils are independently controlled through the multichannel current source and the intelligent terminal equipment, so that the damping force range is flexibly adjusted, and the wide-range damping characteristic adaptation of different devices to be tested is realized. The invention has simple structure, convenient operation and wide applicability.

Inventors

FU GUOHONG
DU LIN
XIAO RONG
WANG GE
Dong yunhao
XU XU
WU CHENGZHE

Assignees

重庆大学

Dates

Publication Date: 20260512
Application Date: 20260407

Claims (10)

1. A magnetorheological fluid control device with wide damping characteristics is characterized by comprising a combined cylinder barrel (2) containing magnetorheological fluid (7) inside, wherein at least three annular grooves are sequentially formed in the periphery of the combined cylinder barrel (2), exciting coils (5) are wound in the grooves, an outer barrel (6) is further sleeved on the periphery of the combined cylinder barrel (2), end covers (3) are respectively arranged at two ends of the outer barrel (6) to seal the two ends of the outer barrel (6) and the combined cylinder barrel (2), through holes are formed in the end covers (3), a double-outlet piston rod (1) is inserted into the combined cylinder barrel (2) through the through holes, the two ends of the double-outlet piston rod (1) extend out of the end covers (3) at the two ends and are respectively connected with a device to be tested, pistons matched with the inner diameter and the shape of the combined cylinder barrel (2) are arranged in the middle of the double-outlet piston rod (1), and the double-outlet piston rod (1) moves in the combined cylinder barrel (2) to push the magnetorheological fluid (7) to flow so as to form damping force.
2. The magnetorheological fluid control device with the wide-range damping characteristic according to claim 1, wherein the combined cylinder (2) is a square cylinder, the square cylinder comprises two groups of opposite faces, one group of opposite faces is provided with two magnetic conductive first cylinder pieces (21) and the other group of opposite faces is provided with a magnetic non-conductive second cylinder piece (22), the outer cylinder (6) sleeved on the periphery of the combined cylinder (2) is a square outer cylinder (6), the inner diameter of the square outer cylinder (6) is matched with the outer diameter of the combined cylinder (2), and the piston in the middle of the double-piston rod (1) is a square piston with matched inner diameter and shape of the combined cylinder (2).
3. The magnetorheological fluid control device with wide-range damping characteristics according to claim 1, wherein each group of the exciting coils (5) is electrically connected with an external multichannel current source (8), and the energizing current of each group of the exciting coils (5) is independently controlled by the multichannel current source (8) to adjust the damping force range.
4. The magnetorheological fluid control device with wide-range damping characteristics according to claim 3, wherein the multichannel current source (8) is further electrically connected with an intelligent terminal device (9), the energizing current and the magnetic field information of each group of exciting coils (5) are transmitted to the intelligent terminal device (9), and the energizing current of each group of exciting coils (5) is regulated and controlled by an instruction sent by the intelligent terminal device (9).
5. The magnetorheological fluid control device with the wide-range damping characteristic according to claim 1, wherein the piston in the middle of the double-piston rod (1) is in clearance fit with the inner diameter of the combined cylinder barrel (2), and the clearance is controlled within the range of 1-3 mm.
6. The magnetorheological fluid control device with a wide range of damping characteristics according to claim 1, wherein the bottom of the groove is provided with a wire guide from which the wires of the exciting coil (5) are led out.
7. The magnetorheological fluid control device of claim 1, wherein the through-hole has a seal ring.
8. The magnetorheological fluid control device with the wide-range damping characteristic according to claim 1, wherein the end cover (3) is further provided with a fluid injection port and an exhaust port, the fluid injection port is used for filling magnetorheological fluid (7) into the combined cylinder barrel (2), and the exhaust port is used for exhausting air in the working cavity so as to ensure that the magnetorheological fluid (7) fills the whole working cavity.
9. The magnetorheological fluid control device with wide-range damping characteristics according to claim 1, wherein the outer cylinder (6) is made of steel No. 20 or steel No. 15, and forms a closed magnetic field in cooperation with the exciting coil (5).
10. The magnetorheological fluid control device with wide-range damping characteristics according to claim 2, wherein the first cylinder barrel piece (21) is made of electrical pure iron, silicon steel sheet, low carbon steel, iron-cobalt alloy or iron-nickel alloy, and the second cylinder barrel piece (22) is made of 304 stainless steel, 316 stainless steel, titanium alloy or copper alloy.

Description

Magnetorheological fluid control device with wide-range damping characteristic Technical Field The invention belongs to the technical field of intelligent material control, and relates to a magnetorheological fluid control device with a wide-range damping characteristic. Background In recent years, magnetorheological fluid technology has been widely used in a plurality of fields by virtue of the advantages of quick response, strong controllability, low energy consumption and the like. In the automobile industry, the magnetorheological fluid damper is applied to a suspension system of a high-end car, the travelling comfort and the operability of the car are improved by adjusting the damping force, the magnetorheological fluid damper is used for shock resistance and vibration absorption of bridges and high-rise buildings in the building field, the damping force can be adjusted in real time according to wind speed change, and in the precision manufacturing field, the magnetorheological fluid technology is used for vibration control of a machine tool, so that the influence of vibration in the cutting process on the machining precision is reduced, and the machining error of parts is reduced. With the continuous improvement of application requirements, the performance requirements of the magnetorheological fluid control device in the market are increasingly improved, and the device is required to be capable of simultaneously adapting to the testing requirements of various types of devices to be tested, such as automobiles, motorcycles, building components, precise instruments and the like. The cylinder barrel of the traditional magnetorheological fluid control device is mainly formed by integrally processing a single magnetic conductive material (such as common carbon steel), and the structure causes that a magnetic field generated by an excitation coil is easy to randomly diffuse in all directions of the cylinder barrel and cannot be intensively acted on a working area where magnetorheological fluid is located. The uneven distribution of the magnetic field can cause inconsistent viscosity changes of the magnetorheological fluid in different areas in the cylinder barrel, the magnetorheological fluid in partial areas cannot fully respond to the magnetic field changes, and further the damping force generates larger fluctuation, and the fluctuation of the damping force can cause deviation of test data. In order to overcome the defects of narrow damping force control range and poor magnetic field uniformity, the traditional magnetorheological fluid control device often needs to be additionally provided with auxiliary structures, such as a plurality of groups of magnetic guide plates, a magnetic field shielding cover, a complex transmission mechanism and the like, so that the whole structure of the device is complex, the volume is huge and the weight is increased. Meanwhile, the complex structure also improves the assembly difficulty and maintenance cost of the device, and in the maintenance process, the fault investigation difficulty is high due to the shielding of the auxiliary structure, so that the continuity of the test work is seriously affected. The structural design of the traditional magnetorheological fluid control device lacks versatility, and parameters such as the size of a piston rod, the volume of a cylinder barrel, damping force adjusting logic and the like of the traditional magnetorheological fluid control device are often customized for a specific type of device to be tested, so that the traditional magnetorheological fluid control device cannot flexibly adapt to the testing requirements of different mechanical characteristics. In addition, the control mode of the traditional device is single, and the damping force is controlled by manually adjusting the current, so that the linkage with the intelligent test system cannot be realized. In the component test of the automatic production line, the traditional device is difficult to integrate into an intelligent test flow, manual frequent intervention is needed, the test efficiency is reduced, and the test precision is easily influenced by manual operation errors. To address the shortcomings of conventional devices, a number of improvements have been attempted in the industry. For example, part of enterprises put forward a double-coil magnetorheological fluid control device, and the adjustment range of the magnetic field intensity is enlarged through the series or parallel control of two groups of coils. However, two groups of coils of the device still adopt a synchronous control mode, the current of each group of coils cannot be independently adjusted, the adjustment flexibility of damping force is still insufficient, and fine damping characteristic adaptation is difficult to realize. In the aspect of magnetic field uniformity optimization, research institutions propose a scheme of arranging magnetic guide grooves on the inner wall of a cylinder barrel,