A detection device driven by a magneto-rheological fluid decoupling

Abstract

The application provides a magneto-rheological fluid driving decoupling detection device for detecting the characteristics of the magneto-rheological fluid. The device can at least solve the problem of low detection accuracy. The device comprises a bearing, a shearing assembly and an oscillation assembly. The shearing assembly is arranged above the bearing along the height direction of the bearing and can shear the magneto-rheological fluid. The oscillation assembly is arranged separately from the shearing assembly and is in transmission connection with the bearing. The oscillation assembly can drive the bearing to move along the direction perpendicular to the height direction of the bearing. The control logic of the shearing assembly and the oscillation assembly is decoupled, and it is not necessary to simultaneously process two completely different control algorithms of continuous rotation and high-frequency reciprocation in the same motor driver. Therefore, the detection accuracy is improved.

Description

Technical Field

[0001] This disclosure relates to the field of testing equipment, and more particularly to a magnetorheological fluid-driven decoupled testing device. Background Technology

[0002] Magnetorheological fluids (MR fluids) exhibit low viscosity and Newtonian fluid characteristics when no external magnetic field is applied. Under an applied magnetic field, they become high viscosity and low flow characteristics, resembling Bingham fluids. There is a correlation between the viscosity of the fluid and the magnetic flux.

[0003] Magnetorheological fluids possess both steady-state and dynamic characteristics. Steady-state characteristics refer to the fluid's properties under continuous external force, while dynamic characteristics refer to its properties under disturbance. Together, these characteristics constitute a complete spectrum of the mechanical properties of magnetorheological fluids. In related technologies, both steady-state and dynamic characteristics of magnetorheological fluids are detected using testing devices.

[0004] However, existing detection devices suffer from low detection accuracy. Summary of the Invention

[0005] This disclosure provides a magnetorheological fluid-driven decoupled detection device, which at least solves the problem of low detection accuracy.

[0006] This application provides a magnetorheological fluid-driven decoupled detection device for detecting the properties of magnetorheological fluids. The device includes a support member, a shearing assembly, and an oscillation assembly. The support member includes an upward-opening liquid tank for loading the magnetorheological fluid. The shearing assembly is positioned above the support member along its height and can shear the magnetorheological fluid. The oscillation assembly is separately positioned from the shearing assembly and is drively connected to the support member, driving the support member to move along a direction perpendicular to its height.

[0007] The control logic of the shearing component and the oscillation component is decoupled, eliminating the need to handle two completely different control algorithms—continuous rotation and high-frequency reciprocating—within the same motor driver. This improves detection accuracy.

[0008] In one possible implementation, the oscillation assembly includes a piezoelectric ceramic element. The piezoelectric ceramic element extends in a direction perpendicular to the height of the support element, and one end of the piezoelectric ceramic element along its extension direction is drively connected to the support element.

[0009] In one possible implementation, at least two piezoelectric ceramic elements are provided, and the extending directions of the two piezoelectric ceramic elements intersect in a plane perpendicular to the height direction of the support element.

[0010] In one possible implementation, the oscillation assembly further includes an oscillating element. The oscillating element includes a support portion and a mounting portion. The support portion receives and is connected to the support element. The mounting portion is spaced apart from the support portion along a direction perpendicular to the height of the support element, and their relative positions are fixed. The mounting portion has a mounting groove with a first opening facing the support portion. The mounting groove accommodates a piezoelectric ceramic element, which is connected to the support portion through the first opening.

[0011] In one possible implementation, the oscillation assembly further includes a flexible element. The flexible element is located between the support portion and the mounting portion. One end of the flexible element is connected to the support portion, and the other end is connected to the piezoelectric ceramic element. The elastic modulus of the flexible element is less than that of the support portion.

[0012] In one possible implementation, the support member includes a first wall surface disposed opposite to the bottom wall of the liquid tank. The magnetorheological fluid-driven decoupled detection device further includes a support member and an electromagnetic component. The support member receives and connects to the oscillating element, and a clearance hole is provided on the support portion. The electromagnetic component is connected to the support member, and the end of the electromagnetic component away from the support member is connected to the first wall surface through the clearance hole.

[0013] In one possible implementation, the support member has a receiving cavity, and at least a portion of the electromagnetic component is located within the receiving cavity. The support member also includes a heat exchanger. The heat exchanger is disposed within the receiving cavity and arranged around the periphery of the electromagnetic component, exchanging heat with the electromagnetic component. Along the height direction of the support member, a piezoelectric ceramic component is disposed opposite to the heat exchanger, and the heat exchanger also exchanges heat with the piezoelectric ceramic component.

[0014] In one possible implementation, the detection device for magnetorheological fluid-driven decoupling further includes a signal detection module. The signal detection module is located on the side of the support member opposite to the shear assembly, and is connected to the support member. The signal detection module is used to detect the magnitude of the force and torque of the magnetorheological fluid in at least one direction.

[0015] In one possible implementation, the shearing assembly includes a first driving member and a shearing member, the first driving member being driven by the shearing member for driving the shearing member to shear the magnetorheological fluid. The detection device for magnetorheological fluid drive decoupling further includes a vertical driving assembly. The vertical driving assembly is driven by the shearing assembly for driving the shearing assembly to move along the height direction of the support member.

[0016] In one possible implementation, a temperature control assembly is also included, comprising an insulation shell, a thermostatic element, and a telescopic element. The insulation shell forms an insulation cavity with an opening facing the liquid-carrying tank. The thermostatic element is disposed inside the insulation shell and is arranged around the periphery of the liquid-carrying tank. One end of the telescopic element is connected to the insulation shell, and the other end is connected to a shearing assembly. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0018] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the detection device for magnetorheological fluid-driven decoupling provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of the oscillation component provided in the embodiments of this application; Figure 3 An exploded view of a portion of the structure of the magnetorheological fluid-driven decoupling detection device provided in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of a partial magnetorheological fluid-driven decoupled detection device provided in an embodiment of this application.

[0020] Reference numerals: 100, carrier; 110, liquid tank; 120, first wall surface; 200, shearing assembly; 210, first driving component; 220, shearing component; 300, oscillation assembly; 310, piezoelectric ceramic component; 320, oscillation component; 321, carrier part; 321a, clearance hole; 322, mounting part; 322a, mounting groove; 322b, first opening; 322c, second opening; 323, protective plate; 330. Flexible component; 400, support component; 410, receiving cavity; 420, heat exchange component; 430, protrusion; 500, electromagnetic component; 510, card holder; 511, snap-fit ​​part; 520, iron core; 530, electromagnetic coil; 540, magnetic field detection component; 600, signal detection module; 700, vertical drive assembly; 710, second drive component; 800, temperature control assembly; 810, insulation shell; 820, constant temperature component; 830, telescopic component. Detailed Implementation

[0021] To better understand the above-mentioned objectives, features, and advantages of this disclosure, the solutions disclosed herein will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0022] Numerous specific details are set forth in the following description in order to provide a full understanding of this disclosure, but this disclosure may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some, and not all, of the embodiments of this disclosure.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0024] In the description of the embodiments of this application, the technical terms "first", "second", "third", etc. are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0025] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0026] The present application will now be described in detail. Before describing the embodiments of the present application, the logic behind the technical problem arising from the present application will be explained first.

[0027] In terms of mechanical response, magnetorheological fluids possess both steady-state flow characteristics (the relationship between viscosity, shear stress, and shear rate) and dynamic viscoelasticity (storage modulus, loss modulus, and loss factor).

[0028] Characterizing steady-state properties requires applying unidirectional, continuous, and large-strain shear to the fluid, demanding that the drive source possess high torque, uniform speed, and continuous capability. Characterizing dynamic properties requires applying bidirectional, small-strain, and high-frequency oscillatory shear to the fluid, demanding that the drive source possess low inertia, fast response, and backlash-free capability. Detecting these two properties of magnetorheological fluids requires the same detection device to simultaneously possess two distinct, even physically contradictory, driving capabilities.

[0029] In existing technologies, magnetorheological fluid testing devices generally adopt the single power source architecture of traditional rotating rheometers. That is, the same drive source undertakes both the continuous rotation drive task for steady-state testing and the high-frequency reciprocating oscillation drive task for dynamic testing. At the same time, the same transmission system transmits torque for shearing and calculates the resistance acting on the rotor through motor current.

[0030] The rotor of a single motor possesses an inherent mechanical inertia that cannot be eliminated. Furthermore, high-frequency reciprocating motion demands extremely high angular acceleration and frequent commutation. The greater the inertia, the greater the instantaneous torque required to achieve the target acceleration. When the motor's output torque is insufficient to overcome its own rotor inertia, the actual motion waveform inevitably lags behind the commanded waveform, resulting in phase lag and amplitude attenuation. Thus, the fundamental contradiction between rotational inertia and acceleration leads to low detection accuracy in the detection device.

[0031] In existing solutions, the motor serves as both the excitation source and the measurement source (torque is calculated from the current). Under high-frequency conditions, the motor drive current itself contains a large amount of commutation harmonics and PWM carrier noise. These electrical noises overlap with the weak fluid dynamic response signal in the frequency domain and cannot be effectively separated by simple filtering methods. Thus, the coupling interference between the drive function and the measurement function leads to low detection accuracy.

[0032] The following will describe this application.

[0033] like Figure 1 As shown. This application provides a detection device for magnetorheological fluid driven decoupling, which is used to detect the properties of magnetorheological fluids.

[0034] The magnetorheological fluid-driven decoupled detection device includes a carrier 100, a shearing assembly 200, and an oscillation assembly 300. The carrier 100 includes an upward-opening liquid-carrying tank 110 for holding the magnetorheological fluid. The shearing assembly 200 is positioned above the carrier 100 along its height and can shear the magnetorheological fluid. The oscillation assembly 300 is separately disposed from the shearing assembly 200 and is drively connected to the carrier 100, driving the carrier 100 to move in a direction perpendicular to its height.

[0035] The oscillation component 300 refers to a power unit, independent of the shear component 200, used to drive the carrier component 100 to produce periodic reciprocating motion. The direction of motion of the oscillation component 300 is orthogonal or non-collinear with the direction of motion of the shear component 200 in space.

[0036] The height direction refers to a reference direction perpendicular to the upper surface of the support 100 or the opening plane of the liquid tank 110. For example, the height direction can be a vertical direction or a direction inclined at a certain angle relative to the horizontal plane, depending on the overall layout of the magnetorheological fluid-driven decoupled detection device. This application further explains this using this direction as the gravity direction.

[0037] By setting the shearing component 200 and the oscillation component 300 as two independent physical entities, and directly connecting the oscillation component 300 to the carrier component 100, spatial separation of the excitation source is achieved. The shearing component 200 is only responsible for applying steady-state shearing force to the fluid; the oscillation component 300 is specifically responsible for driving the carrier component 100 to perform high-frequency, small-displacement reciprocating motion. The two do not interfere with each other, and their respective kinematic parameters (speed, torque, frequency, amplitude) can be set separately by independent control systems.

[0038] The oscillation assembly 300 independently drives the carrier 100, eliminating the limitation of rotational inertia of the traditional motor rotor. The oscillation assembly 300 can use an actuator with high-frequency response characteristics, thereby increasing the dynamic test frequency to hundreds of hertz, meeting the performance characterization requirements of magnetorheological fluids under high-frequency conditions, and thus improving the detection accuracy.

[0039] The oscillation component 300 drives the carrier component 100 to move without having to go through a long chain transmission path such as a motor shaft, coupling and bearings, which reduces nonlinear errors caused by transmission gaps and friction, and makes the shear oscillation waveform closer to the ideal sine wave.

[0040] The control logic of the shearing component 200 and the oscillation component 300 is decoupled, eliminating the need to handle two completely different control algorithms—continuous rotation and high-frequency reciprocating—within the same motor driver. This improves detection accuracy.

[0041] Operators can independently turn any component on or off according to testing needs, and freely switch between steady-state test mode, dynamic test mode, or steady-state-dynamic synchronous composite test mode. This increases the number of test scenarios.

[0042] The vertical arrangement of the shear assembly 200 above and the support member 100 below allows the shear assembly 200 to be naturally pressed into the surface of the magnetorheological fluid under the action of gravity, which is beneficial to maintaining a constant test gap.

[0043] The oscillation component 300 moves perpendicular to the height direction (i.e., linear or circular motion in the horizontal plane), forming a spatial orthogonal relationship with the rotation plane or perpendicular shearing direction of the shear component 200. This orthogonal relationship kinematically severs the coupling between the two excitations, allowing the signal acquired by the force gauge to be clearly attributed to a specific excitation source, simplifying the separation algorithm for signal post-processing.

[0044] The support component 100 refers to the structural component used to contain and support the magnetorheological fluid sample. The core function of the support component 100 is to provide a stable test boundary and transmit mechanical excitation. The liquid tank 110 is a recessed area on the support component 100 used to hold the magnetorheological fluid sample.

[0045] For example, the carrier 100 may be a disc-shaped, rectangular plate-shaped, or cup-shaped structure.

[0046] For example, the material of the carrier 100 includes, but is not limited to, non-magnetic stainless steel, aluminum alloy, titanium alloy, engineering plastics, or ceramic composite materials. The purpose of using non-magnetic materials is to reduce interference with the electromagnetic field distribution.

[0047] For example, the cross-sectional shape of the liquid tank 110 includes, but is not limited to, a circle, annulus, or rectangle.

[0048] For example, the bottom of the liquid tank 110 may be a flat surface, a conical surface, or a surface with a microstructure texture to increase contact friction with the fluid or change the flow boundary conditions.

[0049] The shearing component 200 refers to an actuator that applies shear force to the magnetorheological fluid to induce its flow or deformation.

[0050] See Figure 1 and Figure 2 As shown. In one possible implementation, the oscillation assembly 300 includes a piezoelectric ceramic element 310. The piezoelectric ceramic element 310 extends in a direction perpendicular to the height of the support member 100, and one end of the piezoelectric ceramic element 310 along its extension direction is drively connected to the support member 100.

[0051] The piezoelectric ceramic component 310 possesses extremely high response speed (microseconds to milliseconds) and nanometer-level displacement resolution, enabling stable output of sinusoidal displacement waveforms with frequencies up to hundreds or even thousands of hertz, providing a hardware foundation for high-frequency dynamic modulus testing of magnetorheological fluids. This improves the detection accuracy of magnetorheological fluid-driven decoupled detection devices.

[0052] The piezoelectric ceramic component 310 operates based on the principle of solid deformation. It has no rotating parts, no friction pairs, and no transmission backlash, which fundamentally eliminates the displacement dead zone caused by wear and backlash in traditional transmission mechanisms and improves the service life of the device.

[0053] The piezoelectric ceramic component 310 is a capacitive load with a small current during operation. Compared to electromagnetic exciters, it significantly reduces the magnetic field interference to the surrounding electromagnetic coils 530 (such as magnetorheological fluid excitation coils), which helps maintain the uniformity and stability of the test magnetic field.

[0054] The piezoelectric ceramic component 310 is a functional element that utilizes the inverse piezoelectric effect to generate precise mechanical displacement when an electric field is applied.

[0055] For example, the shape of the piezoelectric ceramic element 310 includes, but is not limited to: stacked, sheet, tubular, or annular.

[0056] For example, the materials of the piezoelectric ceramic component 310 include, but are not limited to: lead zirconate titanate piezoelectric ceramic, lead magnesium niobate-lead titanate piezoelectric single crystal, or potassium sodium niobate lead-free piezoelectric ceramic.

[0057] It should be noted that the extension direction of the piezoelectric ceramic component 310 is the same as the direction of the driving force output. This allows the displacement output of the piezoelectric ceramic component 310 to be directly converted into the horizontal shear displacement of the bearing component 100, eliminating the need for a reversing mechanism and reducing energy loss and response delay.

[0058] The horizontally extending layout allows the piezoelectric ceramic component 310 to be accommodated in the flat space below the support component 100 without occupying vertical dimensions, which helps to lower the center of gravity of the whole machine and improve stability during high-speed movement.

[0059] In one possible implementation, the piezoelectric ceramic element 310 can also adopt a push-pull structure with dual output, that is, two piezoelectric ceramic elements 310 are arranged opposite each other, one extends while the other retracts, jointly driving the carrier 100, which can improve the output force and reduce thermal drift.

[0060] For example, the preload method of the piezoelectric ceramic component 310 includes, but is not limited to: disc spring preload, threaded sleeve preload, or wedge preload.

[0061] See also Figure 1 and Figure 2 As shown. In one possible implementation, at least two piezoelectric ceramic elements 310 are provided, and the extending directions of the two piezoelectric ceramic elements 310 intersect in a plane perpendicular to the height direction of the support member 100.

[0062] At least two piezoelectric ceramic elements 310 with intersecting extension directions constitute a multi-degree-of-freedom driving system in a plane. Each piezoelectric ceramic element 310 is independently controlled, driving the carrier 100 to move along its respective axis. By controlling the output displacement ratio and phase difference of the two piezoelectric ceramic elements 310 through the principle of vector synthesis, the carrier 100 can achieve linear, elliptical, or circular motion in any direction in the horizontal plane.

[0063] By controlling the phase difference between the two piezoelectric ceramic components 310, elliptical or circularly polarized shear trajectories can be generated to simulate the actual service conditions of magnetorheological fluids under rotating magnetic fields or multi-directional vibration environments, making the tests more accurate.

[0064] The parallel drive of the two piezoelectric ceramic components 310 provides a greater output driving force in the composite direction. At the same time, the redundant drive structure formed by multiple piezoelectric ceramic components 310 increases the constraint stiffness of the system in the non-drive direction, suppresses the undesirable degree of freedom sway of the bearing component 100, and improves test repeatability.

[0065] Intersection of extension directions in a plane means that the central axes of the length directions of the two piezoelectric ceramic parts 310 are not parallel on the horizontal projection plane, and there is an intersection point or line of intersection.

[0066] For example, the extension directions of the two piezoelectric ceramic parts 310 can be perpendicular to each other, forming an orthogonal coordinate system.

[0067] For example, the number of piezoelectric ceramic elements 310 can be set to 2, 3, 4, 5, or more.

[0068] When the number of piezoelectric ceramic elements 310 is set to multiple, the driving directions of at least two of the piezoelectric ceramic elements 310 intersect.

[0069] See also Figure 1 and Figure 2 As shown. In one possible embodiment, the oscillation assembly 300 further includes an oscillator 320. The oscillator 320 includes a support portion 321 and a mounting portion 322. The support portion 321 receives and is connected to the support member 100. The mounting portion 322 is spaced apart from the support portion 321 along a direction perpendicular to the height of the support member 100, and the relative positions of the mounting portion 322 and the support portion 321 are fixed. The mounting portion 322 is provided with a mounting groove 322a, which has a first opening 322b facing the support portion 321. The mounting groove 322a accommodates a piezoelectric ceramic component 310, which is connected to the support portion 321 through the first opening 322b.

[0070] For example, the number of piezoelectric ceramic components 310 can also be set to one. In this way, the cost can be reduced while realizing the drive support component 100.

[0071] The piezoelectric ceramic component 310 is encapsulated within the mounting groove 322a of the mounting portion 322, and the support portion 321 is connected to the support member 100. The mounting groove 322a provides physical protection, radial constraint, and positioning reference for the piezoelectric ceramic component 310. The output end of the piezoelectric ceramic component 310 extends through the first opening 322b and connects to the support portion 321, forming a complete force transmission closed loop, i.e., the piezoelectric ceramic component 310 pushes / pulls the support portion 321, and the support portion 321 drives the support member 100.

[0072] The mounting groove 322a encloses the main body of the piezoelectric ceramic component 310, reducing the erosion of the piezoelectric ceramic component 310 electrodes and ceramic body by magnetorheological fluid splashing during testing.

[0073] The groove wall of the mounting groove 322a provides a precise mounting reference surface for the piezoelectric ceramic component 310. During assembly, the piezoelectric ceramic component 310 can be pushed into the groove and pressed against the reference surface to ensure that the extension direction of the piezoelectric ceramic component 310 is consistent with the theoretical design axis. There is no need to repeatedly adjust the alignment, which improves assembly efficiency and batch consistency.

[0074] The mounting part 322 and the bearing part 321 are fixed in relative positions, so that the oscillator 320 forms a closed or semi-closed frame structure. This frame structure has high in-plane stiffness and can withstand the thrust output by the piezoelectric ceramic part 310 without significant deformation, so that most of the displacement energy is used to drive the bearing part 100 rather than being lost in structural deformation.

[0075] The oscillator 320 is the structural carrier of the oscillator assembly 300, used to integrate the piezoelectric ceramic component 310 and establish a mechanical interface with the carrier 100 and the support 400.

[0076] For example, the oscillator 320 can be a precision structural component that is machined in one piece, or it can be a combination of multiple sub-parts assembled together.

[0077] The support portion 321 is a region or structural feature on the vibrating member 320 used for direct mounting and support of the support member 100. For example, the support portion 321 may be a platform surface, a boss, or a flange with locating pin holes.

[0078] Mounting part 322 is a structural part on the vibrator 320 used to fix the piezoelectric ceramic part 310. For example, mounting part 322 may be a solid base, a frame sidewall or a freestanding column.

[0079] It should be noted that the mounting part 322, the bearing part 321, and the oscillating element 320 can be axisymmetric or centrosymmetric structures, and their axes coincide with the axis of the liquid tank 110.

[0080] The mounting groove 322a is a recessed cavity structure provided on the mounting portion 322 for accommodating and positioning the piezoelectric ceramic part 310. Exemplarily, the cross-sectional shape of the mounting groove 322a includes, but is not limited to, a rectangle, a U-shape, or a semi-circle.

[0081] For example, the connection methods between the bearing portion 321 and the bearing member 100 include, but are not limited to, bolt connection, plug connection, snap connection, adhesive bonding, locking connection, welding, or integral molding.

[0082] The relative positions of the mounting part 322 and the bearing part 321 are fixed. Specifically, the mounting part 322 and the bearing part 321 can be connected by a connecting rod.

[0083] In one possible implementation, the mounting groove 322a has an upward-facing second opening 322c for removing and replacing the piezoelectric ceramic component 310. In this embodiment, the oscillator 320 also includes a protective plate 323, which is detachably connected to the mounting portion 322 and serves to close or open the second opening 322c.

[0084] See also Figure 1 and Figure 2As shown. In one possible embodiment, the oscillation assembly 300 further includes a flexible member 330. The flexible member 330 is located between the support portion 321 and the mounting portion 322. One end of the opposite ends of the flexible member 330 is connected to the support portion 321, and the other end is connected to the piezoelectric ceramic member 310. The elastic modulus of the flexible member 330 is less than the elastic modulus of the support portion 321.

[0085] Through the impedance matching and filtering effect of the flexible component 330, interface reflection and local resonance are suppressed, enabling the oscillation component 300 to obtain a flatter amplitude frequency response and a linear phase frequency response in a wide frequency range from low frequency to 400 Hz.

[0086] The flexible component 330 reduces the reflection of vibration waves at the interface, allowing the mechanical energy output by the piezoelectric ceramic component 310 to be transferred to the carrier component 100 more efficiently, thus converting it into effective shearing of the magnetorheological fluid. In this way, while producing the same shear strain amplitude, the driving voltage and current required for the piezoelectric ceramic component 310 can be reduced, thereby reducing the power consumption and heat generation of the driving power supply.

[0087] Flexible component 330 is a structural element with a certain elastic deformation capability, used to transmit force, buffer impact, or realize the amplification of minute displacement.

[0088] For example, the flexible element 330 may be a metal flexible hinge (such as a single-axis flexible hinge, a cross spring hinge), a rubber elastomer, a disc spring, or a diaphragm spring.

[0089] For example, under the same external force, the elastic modulus of the flexible member 330 is less than that of the bearing portion 321.

[0090] See also Figure 1 , Figure 3 and Figure 4 As shown. In one possible embodiment, the support member 100 includes a first wall surface 120, which is disposed opposite to the bottom wall of the liquid tank 110. The magnetorheological fluid driven decoupled detection device also includes a support member 400 and an electromagnetic member 500. The support member 400 receives and is connected to the oscillator 320, and the support portion 321 is provided with a clearance hole 321a. The electromagnetic member 500 is connected to the support member 400, and one end of the electromagnetic member 500 away from the support member 400 is connected to the first wall surface 120 through the clearance hole 321a.

[0091] The electromagnetic component 500 is directly connected to the bottom of the carrier 100. Magnetic lines of force perpendicularly pass through the bottom wall of the carrier 100 and enter the fluid, resulting in a short magnetic path and low magnetic resistance. The magnetic field distribution at the bottom of the liquid tank 110 is more uniform, which is conducive to the formation of a regular chain-like structure inside the fluid, improving the repeatability of dynamic modulus testing and thus enhancing detection accuracy.

[0092] An obstacle clearance hole 321a is provided on the bearing part 321, allowing the electromagnetic component 500 to pass through the oscillator 320 without physical interference. This enables the vertical excitation path and the horizontal oscillation drive to coexist and run in parallel in three-dimensional space, reducing the overall height of the machine.

[0093] Both the electromagnetic component 500 and the oscillating component 320 are mounted on the base, which simplifies the alignment operation of the axis of the electromagnetic component 500, the center of the bearing component 100, and the drive center of the oscillating component 320, thereby improving the accuracy of the alignment operation and thus improving the detection precision.

[0094] The first wall surface 120 refers to the outer surface of the support member 100 facing downwards and opposite to the bottom wall of the liquid tank 110.

[0095] The support 400 is used to support the oscillation assembly 300 and the electromagnetic component 500, and to establish a connection with the external frame.

[0096] The clearance hole 321a is a through-hole structure formed on the support portion 321 of the oscillator 320 for the electromagnetic component 500 to pass through. Exemplarily, the shape of the clearance hole 321a includes, but is not limited to, a circular hole, an oblong hole, or a rectangular hole. It should be noted that the size of the clearance hole 321a is larger than the outer diameter of the electromagnetic component 500 to avoid contact friction between the electromagnetic component 500 and the support portion 321 during dynamic movement.

[0097] Electromagnetic component 500 refers to an actuator used to generate a controllable magnetic field to magnetize a magnetorheological fluid and adjust its rheological properties. Exemplarily, electromagnetic component 500 includes, but is not limited to: an electromagnetic coil 530 (wound around a magnetic core), a Helmholtz coil, or a hybrid excitation structure of permanent magnets and electromagnets.

[0098] For example, the connection methods between the electromagnetic component 500 and the support component 400 include, but are not limited to, bolt connection, plug-in connection, snap-fit ​​connection, adhesive bonding, locking connection, welding, or integral molding.

[0099] Specifically, the electromagnetic component 500 includes a mounting base 510, an iron core 520, and an electromagnetic coil 530 wound around the iron core 520. The mounting base 510 has a locking portion 511 at its bottom end. The support member 400 has a protrusion 430 that mates with the locking portion 511. Workers can quickly locate the installation position of the electromagnetic component 500 using the locking portion 511 and the protrusion 430, thereby enabling the installation of the electromagnetic component 500.

[0100] In one possible implementation, a magnetic field detector 540 is disposed between the electromagnetic component 500 and the first wall surface 120, thereby enabling the detection of the magnetic field strength. Exemplarily, the magnetic field detector 540 may be a Hall element.

[0101] In one possible implementation, multiple electromagnetic elements 500 may be provided, with varying numbers of coils or different lengths. When an electromagnetic element 500 is mounted on the support member 400, a portion of the electromagnetic element 500 protrudes above the oscillating member 320. In this case, the support member 100 can be adjusted to a corresponding height. For example, the support member 400 may be provided with support legs to increase the distance between the liquid tank 110 and the support member 400.

[0102] See also Figure 1 , Figure 3 and Figure 4 As shown. In one possible embodiment, the support member 400 has a receiving cavity 410, and at least a portion of the electromagnetic element 500 is located in the receiving cavity 410. The support member 400 also includes a heat exchanger 420. The heat exchanger 420 is disposed in the receiving cavity 410 and arranged around the periphery of the electromagnetic element 500, and the heat exchanger 420 exchanges heat with the electromagnetic element 500. Along the height direction of the support member 100, the piezoelectric ceramic element 310 is disposed opposite to the heat exchanger 420, and the heat exchanger 420 also exchanges heat with the piezoelectric ceramic element 310.

[0103] In one possible scenario, the electromagnetic component 500 may generate heat during prolonged energization, leading to increased coil resistance, decreased excitation current, and unstable magnetic field strength. Simultaneously, the heat may be conducted to the magnetorheological fluid via the carrier component 100, causing an increase in fluid temperature and a decrease in viscosity, resulting in measured rheological parameters deviating from their true values.

[0104] A heat exchanger 420 is installed within the housing cavity 410 of the base, surrounding the electromagnetic component 500. The heat generated by the electromagnetic component 500 is absorbed and carried away by the heat exchanger 420. By continuously cooling the electromagnetic component 500, the increase in coil resistance due to temperature rise is suppressed, keeping the excitation current constant during long-term testing and reducing the fluctuation range of magnetic induction intensity. This improves detection accuracy and enhances the reproducibility of magnetorheological fluid testing conditions.

[0105] The displacement output of the piezoelectric ceramic component 310 is sensitive to temperature; an increase in temperature will cause changes in the piezoelectric constant and thermal expansion displacement. The heat exchanger 420 is positioned opposite to the piezoelectric ceramic component 310, which can remove the heat generated during its operation, keeping the piezoelectric ceramic component 310 within a constant operating temperature range. This improves the repeatability of the displacement output, ensures the accuracy of shear strain, and thus enhances the accuracy of the detection.

[0106] The insulation layer of electromagnetic coil 530 ages rapidly at high temperatures. Heat exchanger 420 can control the maximum operating temperature of the coil, delay the embrittlement and cracking of the insulation layer, and extend the service life of electromagnetic component 500.

[0107] The receiving cavity 410 is a cavity structure formed inside the seat. For example, the receiving cavity 410 can be a closed cavity or an open cavity with an opening.

[0108] The heat exchanger 420 is a device used to exchange heat with the heating element and to transfer heat to the outside or a cooling medium.

[0109] For example, the heat exchanger 420 includes, but is not limited to: a circulating liquid cooling plate, air-cooled heat sink fins, heat exchange piping, a semiconductor cooling chip, or a vapor chamber. When the heat exchanger 420 is a heat exchange piping, the heat exchange piping can pass through the support member 400 to form a circulation loop with the outside.

[0110] For example, the heat exchanger 420 can be made of a non-magnetic material (such as copper, aluminum alloy, or plastic), which will not bypass or magnetically shield the magnetic circuit generated by the electromagnetic component 500, and will not affect the magnetic field strength in the magnetorheological fluid region. This can improve the detection accuracy.

[0111] See also Figure 1 , Figure 3 and Figure 4 As shown. In one possible implementation, the detection device for magnetorheological fluid-driven decoupling further includes a signal detection module 600. The signal detection module 600 is located on the side of the support member 100 opposite to the shear assembly 200, and is connected to the support member 100. The signal detection module 600 is used to detect the magnitude of the force and torque of the magnetorheological fluid in at least one direction.

[0112] The signal detection module 600 is independently positioned on the side of the support member 100 opposite to the shear assembly 200 and is directly connected to the support member 100. The signal detection module 600, as an independent force sensing node, is connected in series at the end of the fluid reaction force transmission path. The normal force, tangential force, and torque exerted by the fluid on the support member 100 are directly transmitted to the signal detection module 600 through the support member 100, which then directly outputs an electrical signal proportional to the applied force.

[0113] The signal detection module 600 is directly connected to the support member 100. As the direct object of force, the support member 100 receives all the reaction forces from the magnetorheological fluid without attenuation or reversal, which are then transmitted to the signal detection module 600. This improves the measurement accuracy of the signal detection module 600, thereby enhancing the overall detection accuracy of the device.

[0114] Since the signal detection module 600 is located on the side of the support member 100, while the power source for driving the shear assembly 200 is located above the support member 100, interference factors such as vibration, friction, and cogging torque fluctuations of the drive motor are reduced, thus improving the purity of the measured force signal. This, in turn, improves the detection accuracy.

[0115] The signal detection module 600 refers to a sensing unit that converts mechanical quantities (force, torque, pressure) into processable electrical signals.

[0116] For example, the signal detection module 600 includes, but is not limited to, piezoelectric force sensors, strain gauge force sensors, capacitive force sensors, or fiber optic force sensors. For example, the signal detection module 600 can be a single-axis sensor or a multi-component force measurement platform, capable of simultaneously detecting force components in three directions and torque components in three directions.

[0117] See also Figure 1 , Figure 3 and Figure 4 As shown. In one possible implementation, the shearing assembly 200 includes a first driving member 210 and a shearing member 220, the first driving member 210 being driven to the shearing member 220 for driving the shearing member 220 to shear the magnetorheological fluid. The detection device for magnetorheological fluid drive decoupling further includes a vertical driving assembly 700. The vertical driving assembly 700 is driven to the shearing assembly 200 for driving the shearing assembly 200 to move along the height direction of the support member 100.

[0118] An independent vertical drive assembly 700 is configured for the shear assembly 200, enabling it to move in a controlled manner along the height direction. The vertical drive assembly 700 allows for the quantitative setting, dynamic maintenance, and rapid disengagement of the test gap between the shear member 220 and the carrier member 100.

[0119] The vertical drive assembly 700 can drive the shear assembly 200 to descend to a preset position with micron-level resolution, precisely defining the gap between the bottom wall of the liquid tank 110 and the working end face of the shear member 220. For parallel plate systems, the accuracy of this gap directly affects the accuracy of the dynamic modulus calculation results. Thus, the detection accuracy can be improved by using the vertical drive assembly 700.

[0120] It can also automatically switch between different test gaps in different sample tests through program control, and study the influence of gap size on the wall effect and sedimentation behavior of magnetorheological fluid.

[0121] Before testing, the vertical drive assembly 700 can raise the shear assembly 200 to a high position, making it easier for the operator to add magnetorheological fluid to the liquid tank 110. After testing, the vertical drive assembly 700 raises the shear assembly 200 to a high position, completely detaching the shear piece 220 from the magnetorheological fluid, making it easier for the operator to clean it.

[0122] The vertical drive assembly 700 refers to the adjustment mechanism used to change the overall position of the shear assembly 200 in the height direction.

[0123] For example, the vertical drive assembly 700 includes, but is not limited to: a ball screw slide, a piezoelectric stepper linear motor, an air-bearing guide rail, or a precision manual lifting platform.

[0124] The shearing element 220 is an actuator that directly contacts the magnetorheological fluid and applies shear strain.

[0125] For example, the shearing component 220 includes, but is not limited to, a parallel plate rotor, a conical plate rotor, a coaxial cylindrical inner cylinder, or a blade rotor.

[0126] In one possible implementation, the shear member 220 is provided with a temperature sensor for detecting the temperature of the magnetorheological fluid.

[0127] See also Figure 1 , Figure 3 and Figure 4 As shown. In one possible embodiment, it also includes a temperature control assembly 800, which includes an insulation shell 810, a temperature-regulating element 820, and a telescopic element 830. The insulation shell 810 forms an insulation cavity with an opening facing the liquid-carrying tank 110. The temperature-regulating element 820 is disposed inside the insulation shell 810 and is arranged around the periphery of the liquid-carrying tank 110. One end of the telescopic element 830 is connected to the insulation shell 810, and the other end is connected to the shearing assembly 200.

[0128] An independent temperature-controlled microenvironment is constructed around the liquid-carrying tank 110. The insulation shell 810 forms an insulation cavity to reduce heat loss, and the second heat exchanger 420 is arranged around the periphery to achieve uniform heating or cooling, thus achieving a constant temperature within the insulation cavity.

[0129] The telescopic component 830 establishes a flexible sealed connection between the insulation shell 810 and the upper moving shear assembly 200, allowing the shear assembly 200 to rotate / rise while blocking air convection inside and outside the insulation cavity.

[0130] The second heat exchanger 420 is arranged around the circumference of the liquid tank 110, providing a ring-like heating / cooling for the magnetorheological fluid. This results in a large heat transfer area and a small temperature gradient. Combined with the insulation effect of the heat-insulating shell 810, the temperature of the magnetorheological fluid can be stably controlled within ±0.1 degrees Celsius of the set value, improving temperature accuracy and consequently, detection accuracy.

[0131] The telescopic component 830 brings the insulation shell 810 into contact with the shear assembly 200, sealing the annular gap between them. This structure prevents external cold air from sinking down along the drive shaft of the shear assembly 200 to the surface of the liquid tank 110, and also prevents hot air inside the insulation cavity from rising and escaping, thus reducing heat loss and saving energy.

[0132] The flexibility or telescopic characteristics of the telescopic component 830 can follow the lifting and lowering movement of the shear assembly 200 driven by the vertical drive assembly 700, as well as the high-speed rotation / oscillation movement of the shear component 220 itself, to achieve dynamic sealing without affecting the mechanical properties of the shear assembly 200.

[0133] By combining the magnetic field provided by the electromagnetic component 500 and the temperature field provided by the temperature control component 800, this magnetorheological fluid driven decoupled detection device has the capability of multi-field coupling testing of magnetic-thermal-mechanical fields, and can systematically study the decay law of magnetorheological effect of magnetorheological fluid at different temperatures.

[0134] Temperature control component 800 refers to a complete set of devices used to maintain a constant ambient temperature for magnetorheological fluid testing or to change the test temperature according to a set program.

[0135] Constant temperature means that the effect of temperature changes on the test results is negligible.

[0136] The insulation shell 810 is a shell structure that forms a closed or semi-closed insulation chamber to reduce convective heat transfer between the liquid tank 110 area and the external environment.

[0137] For example, the insulation shell 810 may be made of materials including but not limited to: stainless steel (high strength), polycarbonate (transparent, easy to observe), or glass fiber reinforced nylon (good thermal insulation). For example, the insulation shell 810 may also have a magnetic shielding function.

[0138] The second heat exchanger 420 refers to a component installed inside the insulation cavity that directly exchanges heat with the surrounding environment of the liquid tank 110.

[0139] For example, the second heat exchanger 420 includes, but is not limited to: heating resistance wire, semiconductor cooling chip, circulating water coil or electric heating tape.

[0140] In summary, the magnetorheological fluid-driven decoupled detection device provided in this application has the following beneficial effects: the control logic of the shear component 200 and the oscillation component 300 is decoupled, allowing them to be turned on or off independently, thus enabling free switching between steady-state and dynamic testing. This solves the problem that a single power source cannot handle high-frequency dynamic testing. The oscillation component 400 can generate dynamic characterization with a maximum oscillation of 400Hz, thereby improving detection accuracy.

[0141] By utilizing the oscillation component 400 (driven by piezoelectric material) to achieve higher-frequency reciprocating shearing, the dynamic modulus of magnetorheological fluid under high-frequency operating conditions is obtained. Compared with traditional motors in high-frequency, small-angle reciprocating motion, it has higher control accuracy, faster response speed, and longer service life, thereby significantly reducing the equipment failure rate and broadening the frequency range for measuring the dynamic characteristics of magnetorheological fluid.

[0142] The dual piezoelectric ceramics can achieve linear, elliptical, or circular motion in any direction, simulating complex service conditions. Furthermore, the oscillation direction intersects the shear direction, kinematically severing the excitation coupling. The signal detection module 600 is independently positioned below the support 100, directly measuring the magnetorheological fluid reaction force, reducing vibration interference from the drive motor and simplifying signal post-processing. The heat exchanger 420 surrounds the electromagnetic component 500, simultaneously cooling the electromagnetic coil 530 and the piezoelectric ceramic component 310, suppressing magnetic field fluctuations and displacement drift caused by temperature rise. The insulation shell 810 and the telescopic component 830 form a sealed temperature-controlled cavity, maintaining a constant magnetorheological fluid temperature. The piezoelectric ceramic component 310 is encapsulated within the mounting groove 322a, reducing fluid erosion. The electromagnetic component 500 passes through the oscillator 320 and directly connects to the support 100, shortening the magnetic circuit. The overall vertical layout allows gravity to naturally maintain the test gap, while also facilitating disassembly, maintenance, and cleaning. This improves the detection accuracy of the magnetorheological fluid-driven decoupled detection device.

[0143] The above are merely specific embodiments of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to these embodiments, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A detection device for magnetorheological fluid-driven decoupling, characterized in that, Used to detect the properties of magnetorheological fluids; The detection device for magnetorheological fluid-driven decoupling includes: The carrier (100) includes an upward-opening liquid tank (110) for loading the magnetorheological fluid; A shearing assembly (200) is disposed above the support member (100) along the height direction of the support member (100), and the shearing assembly (200) can shear the magnetorheological fluid; An oscillation component (300) is provided separately from the shearing component (200) and is connected to the carrier (100) in a transmission manner. The oscillation component (300) can drive the carrier (100) to move in a direction perpendicular to the height of the carrier (100).

2. The detection device for magnetorheological fluid-driven decoupling according to claim 1, characterized in that, The oscillation component (300) includes: A piezoelectric ceramic element (310) extends in a direction perpendicular to the height of the support element (100), and one end of the piezoelectric ceramic element (310) along its extension direction is connected to the support element (100) in a transmission manner.

3. The detection device for magnetorheological fluid-driven decoupling according to claim 2, characterized in that, The number of the piezoelectric ceramic elements (310) is at least two, and the extension directions of the two piezoelectric ceramic elements (310) intersect in a plane perpendicular to the height direction of the support (100).

4. The detection device for magnetorheological fluid-driven decoupling according to claim 2, characterized in that, The oscillation assembly (300) further includes: an oscillator (320), the oscillator (320) comprising: The support part (321) receives the support member (100) and is connected to the support member (100); The mounting part (322) is arranged at intervals from the support part (321) along a direction perpendicular to the height of the support member (100), and the relative positions of the mounting part (322) and the support part (321) are fixed; the mounting part (322) is provided with a mounting groove (322a), the mounting groove (322a) having a first opening (322b) facing the support part (321); the mounting groove (322a) accommodates the piezoelectric ceramic part (310), and the piezoelectric ceramic part (310) is connected to the support part (321) through the first opening (322b).

5. The detection device for magnetorheological fluid-driven decoupling according to claim 4, characterized in that, The oscillation component (300) also includes: A flexible element (330) is located between the support portion (321) and the mounting portion (322); one end of the flexible element (330) is connected to the support portion (321) and the other end is connected to the piezoelectric ceramic element (310); the elastic modulus of the flexible element (330) is less than the elastic modulus of the support portion (321).

6. The detection device for magnetorheological fluid-driven decoupling according to claim 4, characterized in that, The carrier (100) includes a first wall (120), which is disposed opposite to the bottom wall of the liquid tank (110); the magnetorheological fluid driven decoupling detection device further includes: A support member (400) receives the oscillating member (320) and is connected to the oscillating member (320). The bearing part (321) is provided with a clearance hole (321a). An electromagnetic component (500) is connected to the support component (400), and one end of the electromagnetic component (500) away from the support component (400) is connected to the first wall surface (120) through the clearance hole (321a).

7. The detection device for magnetorheological fluid-driven decoupling according to claim 6, characterized in that, The support member (400) is provided with a receiving cavity (410), and at least a portion of the electromagnetic component (500) is located in the receiving cavity (410); the support member (400) further includes: A heat exchanger (420) is disposed in the receiving cavity (410) and arranged around the electromagnetic component (500). The heat exchanger (420) exchanges heat with the electromagnetic component (500). Along the height direction of the support component (100), the piezoelectric ceramic component (310) is arranged opposite to the heat exchanger (420). The heat exchanger (420) also exchanges heat with the piezoelectric ceramic component (310).

8. The detection device for magnetorheological fluid-driven decoupling according to any one of claims 1 to 7, characterized in that, Also includes: A signal detection module (600) is located on the side of the carrier (100) away from the shear assembly (200). The signal detection module (600) is connected to the carrier (100) and is used to detect the magnitude of the force and torque of the magnetorheological fluid in at least one direction.

9. The detection device for magnetorheological fluid-driven decoupling according to any one of claims 1 to 7, characterized in that, The shearing assembly (200) includes a first driving member (210) and a shearing member (220). The first driving member (210) is connected to the shearing member (220) for driving the shearing member (220) to shear the magnetorheological fluid. The detection device for magnetorheological fluid-driven decoupling also includes: A vertical drive assembly (700) is connected to the shear assembly (200) for driving the shear assembly (200) to move along the height direction of the carrier (100).

10. The detection device for magnetorheological fluid-driven decoupling according to any one of claims 1 to 7, characterized in that, It also includes a temperature control component (800), which includes: The heat-insulating shell (810) forms a heat-insulating cavity with an opening facing the liquid-carrying tank (110); A thermostatic element (820) is disposed inside the heat insulation shell (810), and the thermostatic element (820) is arranged around the periphery of the liquid-carrying tank (110); The telescopic component (830) is connected at one end to the insulation shell (810) and at the other end to the shearing assembly (200).

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