A semi-active inerter device with continuously adjustable eccentricity and control method

Abstract

The application provides a device and a control method for continuously adjusting eccentricity of a semi-active inertial damper, and belongs to the technical field of mechanical power vibration control. The device comprises a lower plate, a flywheel and an upper plate. A spring is arranged between the upper plate and the lower plate. The flywheel is rotatably arranged on a flywheel support frame. The flywheel has a radial groove extending along the radial direction of the flywheel. A sliding block is slidably arranged in the radial groove. The sliding block is hingedly connected to the lower end of a sliding block connecting rod. A horizontal guide groove is formed in the upper plate. The upper end of the sliding block connecting rod is slidably arranged in the horizontal guide groove. An eccentricity adjusting mechanism is further arranged on the upper plate. The eccentricity adjusting mechanism is hingedly connected to the middle part of the sliding block connecting rod. The eccentricity adjusting mechanism drives the sliding block connecting rod to move horizontally along the horizontal guide groove, thereby driving the sliding block to move radially along the radial groove of the flywheel, so as to continuously change the eccentricity. The application can continuously adjust the inertial damper coefficient, ensure simple and reliable structure, have strong bearing capacity and be semi-actively controlled.

Description

Technical Field

[0001] This invention belongs to the field of mechanical dynamic vibration control technology, specifically relating to a semi-active inertial container device and control method with continuously adjustable eccentricity. Background Technology

[0002] In the field of vibration control, inertial devices, as important two-port inertial elements, have been widely used in vehicle suspension, building vibration reduction, and other applications. Existing inertial devices are mainly divided into two categories: mechanical (such as ball screw type and rack and pinion type) and fluid type. Mechanical inertial devices offer high precision and fast response, but have complex structures and are susceptible to friction and wear; fluid inertial devices have simple structures, but suffer from leakage risks and response lag.

[0003] In existing technologies, the main mechanisms for converting linear to rotary motion include gear and rack mechanisms, ball screw mechanisms, and crank-slider mechanisms. Gear and rack mechanisms and ball screw mechanisms offer high precision, but they are complex in structure, have high manufacturing costs, and limited load-bearing capacity.

[0004] Traditional inertial containers use fixed structural parameters, and their inertial capacitance coefficient cannot be adjusted once determined. This makes it difficult to adapt to the wide-frequency vibration isolation requirements under complex vibration environments such as variable working conditions and variable frequencies, which seriously restricts their applicability and robustness in engineering practice.

[0005] Therefore, there is an urgent need for an integrated linear-rotational motion conversion and inertial container device that can achieve continuous adjustment of the inertial coefficient, ensure simple and reliable structure, strong load-bearing capacity, and semi-active control. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by providing a semi-active inertial container device and control method with dynamically changeable inertial capacity coefficient, compact structure, strong load-bearing capacity, and continuously adjustable eccentricity.

[0007] The objective of this invention is achieved through the following technical solution:

[0008] A semi-active inertial container device with continuously adjustable eccentricity includes: a lower plate, a flywheel, and an upper plate. A spring is installed between the upper and lower plates. The flywheel is rotatably mounted on a flywheel support frame, which is fixed to the lower plate. The flywheel has a radial groove extending radially therefrom. A slider is slidably embedded in the radial groove and hinged to the lower end of a slider connecting rod. A horizontal guide groove is formed on the upper plate, and the upper end of the slider connecting rod is slidably mounted in the horizontal guide groove. An eccentricity adjustment mechanism is also installed on the upper plate and hinged to the middle of the slider connecting rod. The eccentricity adjustment mechanism drives the slider connecting rod to move horizontally along the horizontal guide groove, thereby causing the slider to move radially along the radial groove of the flywheel to continuously change the eccentricity.

[0009] Furthermore, the eccentricity adjustment mechanism includes a lead screw, a nut, and a connecting rod. The lead screw is rotatably mounted on the upper plate via a lead screw support frame. The nut is sleeved on the lead screw and forms a helical pair with the lead screw. One end of the connecting rod is hinged to the nut, and the other end is hinged to the slider connecting rod.

[0010] Furthermore, the screw and nut form a helical pair with self-locking properties, which can keep the position of the nut fixed after adjustment, thereby locking the position of the slider connecting rod and the slider.

[0011] Furthermore, one end of the lead screw is connected to a manual adjustment handle or a servo motor for driving the lead screw to rotate.

[0012] Furthermore, a limit block is installed in the radial groove of the flywheel to limit the maximum radial displacement of the slider, thereby limiting the maximum value of the eccentricity and the minimum value of the inertia coefficient.

[0013] Furthermore, the flywheel has four radial grooves evenly distributed along the circumference, one of which has the slider slidably installed in it, and the other three radial grooves are balancing grooves; a limit block is fixedly installed at the outer end of each radial groove, the limit block is used to limit the maximum radial displacement of the slider and to make the mass distribution uniform when the flywheel rotates.

[0014] Furthermore, the device is vertically installed between the vehicle chassis and the wheels. The upper plate is connected to the vehicle body or chassis, and the lower plate is connected to the wheels or suspension arms. The inertia coefficient is adjusted by changing the eccentricity to adapt to different road conditions and loads.

[0015] Furthermore, it also includes a controller and at least one acceleration sensor; the acceleration sensor is used to collect vibration signals, the controller calculates the target inertia coefficient based on the vibration signals, and controls the servo motor to rotate to adjust the eccentricity.

[0016] Furthermore, the flywheel is mounted on the flywheel support frame via rolling bearings.

[0017] The present invention may also include:

[0018] A method for continuous eccentricity adjustment and semi-active control based on the above-mentioned device, the method comprising:

[0019] Step 1: Vertically install the device between the vehicle chassis and the wheel, so that the upper plate is fixedly connected to the chassis, the lower plate is connected to the suspension swing arm, and the spring provides elastic support for the suspension;

[0020] Step 2: When the upper plate and the lower plate reciprocate linearly, the slider connecting rod drives the slider to slide in the radial groove of the flywheel, driving the flywheel to rotate, thereby realizing the conversion of vibration energy and vibration isolation;

[0021] Step 3: The controller collects vibration signals and identifies the current dominant vibration frequency;

[0022] Step 4: Based on the working conditions, the controller drives the lead screw to rotate, causing the nut to move horizontally. This, in turn, pushes the slider connecting rod to move horizontally, changing the radial position of the slider and continuously adjusting the eccentricity. This changes the inertia coefficient. This aligns the system's anti-resonance frequency with the excitation frequency.

[0023] Step 5: Continue operating under the adjusted parameters to optimize vibration isolation performance;

[0024] Step 6: After adjustment, the self-locking characteristic of the lead screw is used to keep the adjusted eccentricity constant, thus achieving semi-active control.

[0025] The beneficial effects of this invention are as follows:

[0026] This invention has a simple structure and low cost. It uses a slider-connector-slider-flywheel mechanism to replace the traditional ball screw or gear rack transmission. It has fewer parts, does not require high-precision thread machining or gear tooth surface grinding, and has relaxed requirements for fit tolerances, which greatly reduces manufacturing costs and process barriers.

[0027] The inertia coefficient of this invention is continuously adjustable. A slider is driven by a lead screw and nut to move within the radial groove of the flywheel, with an eccentricity... The inertia coefficient can be adjusted from near 0 to near the flywheel radius. It can achieve stepless adjustment over a wide range to adapt to different working conditions.

[0028] This invention features semi-active control, which is energy-efficient and reliable. Adjustment requires external power (manual or motor), and the lead screw self-locks after adjustment, eliminating the need for continuous power supply during operation. Compared to electromagnetic adjustable inertial capacitance systems that require continuous power, this solution is more energy-efficient and reliable.

[0029] The linkage-slider structure of this invention has strong load-bearing capacity. It uses a rigid linkage and slider to transmit force, which is more impact-resistant than gear rack and ball screw solutions. Compared with the hinge solution, the load-bearing capacity is significantly improved, making it suitable for heavy-duty, high-frequency, and large-amplitude engineering scenarios. Attached Figure Description

[0030] Appendix Figure 1 This is a schematic diagram of the structure of the present invention;

[0031] Appendix Figure 2 This is the front view of the present invention;

[0032] Appendix Figure 3 This is an exploded view of the present invention;

[0033] Appendix Figure 4 This is a flowchart of the process of the present invention.

[0034] In the attached diagram: 1. Lower plate; 2. Spring; 3. Flywheel support frame; 4. Flywheel; 5. Slider; 6. Limit block; 7. Slider connecting rod; 8. Upper plate; 9. Lead screw support frame; 10. Lead screw; 11. Nut; 12. Connecting rod; 13. Horizontal guide groove; 14. Radial groove. Detailed Implementation

[0035] This invention provides a semi-active inertia container device with continuously adjustable eccentricity, vertically installed between the vehicle chassis and the wheels. It consists of three main functional modules: an elastic support module, an inertia container module (link-slider-flywheel mechanism), and an eccentricity adjustment module, as shown in the attached diagram. Figures 1 to 3 As shown, the inertial capacitance module uses a slider-link-slider-flywheel mechanism to convert linear motion into rotational motion. The lower end of the slider link 7 is hinged to the slider 5, allowing the slider 5 to rotate relative to it.

[0036] The upper end of the slider connecting rod 7 is installed in the horizontal guide groove opened in the upper plate 8, forming a sliding pair: during the eccentricity adjustment process, the slider connecting rod 7 can be translated horizontally; in the working state, its horizontal position is locked by the screw and nut system, and its vertical direction is fixed with the upper plate. The slider 5 is embedded in the radial groove opened in the flywheel 4, forming a sliding pair: during adjustment, the slider 5 is translated radially to change the eccentricity; during operation, the slider 5 slides along the radial groove on the flywheel 4 as the flywheel 4 rotates, while applying a tangential force to the groove wall to drive the flywheel to rotate. The flywheel 4 is installed on the flywheel support frame 3 through rolling bearings, forming a rotating pair, which can rotate freely around the central axis. The flywheel support frame 3 is fixedly connected to the lower plate 1 by bolts. The lower plate 1 and the upper plate 8 are elastically connected by spring 2, providing elastic support for the suspension and realizing relative linear reciprocating motion.

[0037] The limiting block 6 at the outer end of the radial groove prevents the slider 5 from coming off at the maximum eccentricity; the three balance grooves and their limiting blocks can be fitted with counterweights to make the mass distribution uniform when the flywheel rotates, thereby reducing the additional vibration caused by dynamic imbalance.

[0038] Working principle: The slider connecting rod 7 acts as a link, with one end hinged to the slider 5 and the other end constrained within the horizontal guide groove of the upper plate 8. When the upper plate 8 and the lower plate 1 undergo relative displacement, the upper plate 8 transmits the motion to the slider connecting rod 7. The slider 5 moves together with the slider connecting rod 7, sliding within the radial groove of the flywheel 4, applying a tangential force to the flywheel 4, forcing it to rotate around its central axis. The moment of inertia of the flywheel generates a force against the acceleration, which reacts on the slider connecting rod 7 and the upper plate 8.

[0039] The eccentricity adjustment module uses a screw-nut-linkage mechanism to achieve continuous adjustment of the radial position of the slider. The screw 10 is mounted on the upper plate 8 via a screw support frame 9, which is bolted to the upper plate 8. Both ends of the screw are supported by rolling bearings to ensure smooth rotation. The axial position of the screw is locked by a limiting structure, allowing it to rotate only around its own axis. The nut 11 is fitted onto the screw 10, forming a helical pair. When the screw rotates, the nut 11 translates along the screw axis. One end of the link 12 is hinged to the nut 11 via a pin, allowing relative rotation around the hinge point. The other end of the link 12 is also hinged to the middle of the slider link 7 via a pin. The hinge point between the link 12 and the slider link 7 is chosen in the middle to avoid the adjusting force causing the slider link to rotate around its upper and lower ends, ensuring that the adjusting motion is a pure horizontal translation, thereby reducing friction, preventing jamming, and decoupling the working motion from the adjusting motion.

[0040] The upper end of the slider connecting rod 7 is installed in the horizontal guide groove of the upper plate 8, forming a sliding pair, which constrains its movement direction to horizontal translation. When the lead screw 10 rotates to drive the nut 11 to translate, the nut 11 drives the connecting rod 12 to move. The connecting rod 12, through a hinge, pushes the slider connecting rod 7 to translate in the horizontal guide groove of the upper plate along the radial direction of the flywheel. The slider connecting rod 7 drives the slider 5, which is hinged to it, to move synchronously radially in the radial groove of the flywheel 4, thereby changing the eccentricity. After adjustment, the self-locking characteristic of the lead screw 10 keeps the positions of the nut 11 and the connecting rod 12 fixed, thereby locking the horizontal position of the slider connecting rod 7 and ensuring that the eccentricity is constant during operation. In the working state, the slider connecting rod 7 moves vertically with the upper plate 8.

[0041] Preferably, the screw 10 and the nut 11 form a helical pair with self-locking characteristics, which can keep the position of the nut 11 fixed after adjustment, thereby locking the position of the slider connecting rod 7 and the slider 5.

[0042] Working Principle: The eccentricity adjustment module continuously changes the position of slider 5 in the radial groove of flywheel 4, thereby achieving dynamic adjustment of the inertia coefficient. The adjustment process is carried out in a preparatory state where the upper plate 8 and lower plate 1 are stationary. When the lead screw 10 is manually or driven by a servo motor to rotate, the nut 11 translates along the axis of the lead screw, driving the connecting rod 12, which is hinged to it, to move. The other end of the connecting rod 12 is hinged to the slider connecting rod 7, pushing the slider connecting rod to translate horizontally along the radial direction of the flywheel in the horizontal guide groove of the upper plate 8. The slider connecting rod 7 is hinged to slider 5, so slider 5 moves radially synchronously in the radial groove of flywheel 4, thereby changing the distance between the center of slider 5 and the rotation center of flywheel 4, i.e., the eccentricity. According to the formula for inertia coefficient... eccentricity Changes will cause changes in the inertia coefficient The eccentricity changes continuously according to the inverse square law: the closer the slider is to the center, the smaller the eccentricity and the larger the coefficient of inertia; the closer the slider is to the edge, the larger the eccentricity and the smaller the coefficient of inertia. After adjustment, the self-locking characteristic of the lead screw keeps the position of the nut and connecting rod fixed, thereby locking the horizontal position of the slider connecting rod and ensuring that the eccentricity remains constant during operation.

[0043] Example 1:

[0044] The working process of the aforementioned semi-active inertial container device with continuously adjustable eccentricity is as follows: Figure 4 As shown:

[0045] This device is vertically installed between the vehicle chassis and the wheels. The upper plate 8 is fixedly connected to the chassis, and the lower plate 1 is connected to the suspension control arm. The spring 2 provides elastic support for the suspension. When the vehicle bumps, the up-and-down movement of the wheel hub causes the lower plate 1 to reciprocate linearly relative to the upper plate 8. The lower plate transmits the motion to the slider connecting rod 7 through the spring 2. The slider connecting rod 7 drives the slider 5 to slide in the radial groove of the flywheel 4, applying a tangential force to the flywheel and driving it to rotate, thus converting the vibration energy into the rotational kinetic energy of the flywheel and achieving vibration isolation. According to the vehicle load and road conditions, the on-board controller collects the acceleration sensor signal, identifies the current main vibration frequency, and automatically drives the servo motor to rotate the lead screw 10. The lead screw drives the nut 11 to translate, which pushes the slider connecting rod 7 to move horizontally in the horizontal guide groove of the upper plate 8 through the connecting rod 12, changing the radial position of the slider 5 in the radial groove of the flywheel, thereby continuously adjusting the eccentricity. and inertia coefficient ,in, It is the rotational inertia of the flywheel that aligns the anti-resonance frequency of the system with the excitation frequency, thereby optimizing the vibration isolation performance of the suspension under different operating conditions.

[0046] Example 2:

[0047] Unlike Embodiment 1, one end of the lead screw 10 is connected to a manual adjustment handle (e.g., a hexagonal head or knob) instead of a servo motor. During vehicle maintenance or in stationary conditions, the operator can manually rotate the handle to change the eccentricity to adapt to the expected vibration environment. This mode is suitable for low-cost scenarios or where real-time adjustment is not required.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A semi-active inertial container device with continuously adjustable eccentricity, characterized in that, include: The structure consists of a lower plate (1), a flywheel (4), and an upper plate (8). A spring (2) is installed between the upper plate and the lower plate. The flywheel (4) is rotatably mounted on a flywheel support frame (3), which is fixed to the lower plate (1). The flywheel (4) has a radial groove (14) extending radially. A slider (5) is slidably embedded in the radial groove. The slider (5) is hinged to the lower end of a slider connecting rod (7). A horizontal guide groove (13) is provided on the upper plate (8). The upper end of the slider connecting rod (7) is slidably mounted in the horizontal guide groove (13). An eccentricity adjustment mechanism is also installed on the upper plate (8). The eccentricity adjustment mechanism is hinged to the middle of the slider connecting rod (7). The eccentricity adjustment mechanism drives the slider connecting rod (7) to move horizontally along the horizontal guide groove (13), thereby driving the slider (5) to move radially along the radial groove of the flywheel (4) to continuously change the eccentricity.

2. The semi-active inertial container device with continuously adjustable eccentricity according to claim 1, characterized in that, The eccentricity adjustment mechanism includes a lead screw (10), a nut (11) and a connecting rod (12). The lead screw (10) is rotatably mounted on the upper plate (8) via a lead screw support frame (9). The nut (11) is sleeved on the lead screw (10) and forms a helical pair with the lead screw. One end of the connecting rod (12) is hinged to the nut (11), and the other end is hinged to the slider connecting rod (7).

3. The semi-active inertial container device with continuously adjustable eccentricity according to claim 2, characterized in that, The screw (10) and nut (11) form a helical pair with self-locking characteristics. After adjustment, the nut (11) can be kept in a fixed position, thereby locking the position of the slider connecting rod (7) and the slider (5).

4. The semi-active inertial container device with continuously adjustable eccentricity according to claim 2, characterized in that, One end of the lead screw (10) is connected to a manual adjustment handle or a servo motor for driving the lead screw to rotate.

5. The semi-active inertial container device with continuously adjustable eccentricity according to claim 1, characterized in that, Limiting blocks (6) are installed in the radial groove of the flywheel (4) to limit the maximum radial displacement of the slider (5), thereby limiting the maximum value of the eccentricity and the minimum value of the inertia coefficient.

6. The semi-active inertial container device with continuously adjustable eccentricity according to claim 1, characterized in that, The flywheel (4) has four radial grooves evenly distributed along the circumference. The slider (5) is slidably installed in one of the radial grooves, and the other three radial grooves are balance grooves. A limit block (6) is fixedly installed at the outer end of each radial groove. The limit block (6) is used to limit the maximum radial displacement of the slider (5) and make the mass distribution uniform when the flywheel rotates.

7. The semi-active inertial container device with continuously adjustable eccentricity according to claim 1, characterized in that, The device is vertically installed between the vehicle chassis and the wheels. The upper plate (8) is connected to the vehicle body or chassis, and the lower plate (1) is connected to the wheels or suspension arms. The inertia coefficient is adjusted by changing the eccentricity to adapt to different road conditions and loads.

8. The semi-active inertial container device with continuously adjustable eccentricity according to claim 4, characterized in that, It also includes a controller and at least one acceleration sensor; the acceleration sensor is used to collect vibration signals, the controller calculates the target inertia coefficient based on the vibration signals, and controls the servo motor to rotate to adjust the eccentricity.

9. A semi-active inertial container device with continuously adjustable eccentricity according to claim 1, characterized in that, The flywheel (4) is mounted on the flywheel support frame (3) via rolling bearings.

10. A method for continuous eccentricity adjustment and semi-active control based on the device according to any one of claims 1 to 9, characterized in that, The method includes: Step 1: Vertically install the device between the vehicle chassis and the wheel, so that the upper plate (8) is fixedly connected to the chassis, the lower plate (1) is connected to the suspension swing arm, and the spring (2) provides elastic support for the suspension; Step 2: When the upper plate and the lower plate reciprocate linearly, the slider connecting rod (7) drives the slider (5) to slide in the radial groove of the flywheel (4), driving the flywheel (4) to rotate, thereby realizing the conversion of vibration energy and vibration isolation; Step 3: The controller collects vibration signals and identifies the current dominant vibration frequency; Step 4: According to the working conditions, the controller drives the lead screw (10) to rotate, which drives the nut (11) to translate. Through the connecting rod (12), the slider connecting rod (7) is pushed to move horizontally, changing the radial position of the slider (5) and continuously adjusting the eccentricity. This changes the inertia coefficient. This aligns the system's anti-resonance frequency with the excitation frequency. Step 5: Continue operating under the adjusted parameters to optimize vibration isolation performance; Step 6: After adjustment, the self-locking characteristic of the lead screw (10) is used to keep the adjusted eccentricity constant, so as to achieve semi-active control.

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