Automobile gearbox suspension device and vibration isolation method thereof

Abstract

The invention relates to the technical field of gearbox suspension, in particular to an automobile gearbox suspension device and a vibration isolation method thereof.The automobile gearbox suspension device comprises a frame connecting unit, a hydraulic damping unit, a power transmission unit, an inertia energy consumption unit, an energy closed-loop unit, a vibration sensing unit and a self-adaptive control unit; the main hydraulic telescopic rod is filled with high-viscosity silicone oil, the auxiliary hydraulic rod is made of magnetorheological fluid, and full-band vibration is synergistically restrained through a nested structure. A pendulum bob of the inertial energy consumption unit dynamically responds to the shear thickening fluid to offset order resonance; the piezoelectric module recovers vibration energy and stores the vibration energy in the super capacitor to form a self-powered closed loop. According to the method, on the basis of real-time vibration spectrum analysis, damping parameters and energy distribution are intelligently adjusted, the problem that the high and low frequency vibration isolation effect of a traditional suspension is unbalanced is solved, dependence of external power supply is greatly reduced, and the method is suitable for efficient vibration reduction requirements of various vehicles under complex working conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of gearbox suspension, in particular to an automobile gearbox suspension device and a vibration isolation method thereof. Background Art

[0002] The transmission mount is a key component connecting the transmission and the frame in a car. Its main function is to reduce the transmission of transmission vibration to the car body and improve driving comfort. Its core function is to absorb the vibration generated during the operation of the engine and transmission through damping and support structures. In particular, it needs to deal with low-frequency shaking and high-frequency noise problems under complex working conditions such as different vehicle speeds and gear shifting shocks.

[0003] There are significant technical bottlenecks in the hydraulic and rubber mounts of current transmission mounts. Under low-frequency and large-displacement conditions, the traditional rubber main spring cannot suppress idle vibration due to insufficient damping loss. Under high-frequency and small-amplitude excitation, the throttling effect of the hydraulic channel is weakened, resulting in high-frequency noise leakage. The more prominent contradiction is that when the transmission input shaft speed is close to an integer multiple of the vehicle body's natural frequency, the existing mount is prone to structural resonance due to its lack of active tuning capability. In addition, the active mount relies on the energy consumption mode and unidirectional energy dissipation mechanism of external power supply, which makes it difficult to meet the energy-saving needs of new energy vehicles.

[0004] Therefore, in order to improve the full-band vibration isolation capability and energy utilization efficiency of the gearbox mount, an automobile gearbox mount device and a vibration isolation method thereof are proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide an automobile gearbox suspension device and a vibration isolation method thereof, so as to solve the problems that the full-band vibration isolation capability of the gearbox suspension is not adapted and the vibration energy is wasted.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: an automobile gearbox suspension device, comprising the following units: M1, the frame connection unit includes a fixing frame, which is fixed to the vehicle frame and has a hydraulic telescopic rod mounting interface symmetrically provided on the upper and lower sides; M2, the hydraulic damping unit includes a main hydraulic telescopic rod and a secondary hydraulic telescopic rod, the main hydraulic telescopic rod is hinged to the upper mounting interface of the fixing frame, and the secondary hydraulic telescopic rod is hinged to the lower mounting interface of the fixing frame and nested outside the main hydraulic telescopic rod; M3, the power transmission unit includes a support rod, one end of which is connected to the gearbox fixed assembly frame through a three-degree-of-freedom ball joint, and the other end is sleeved on the outside of the auxiliary hydraulic telescopic rod. A linear slide is used to form an axial displacement constraint between the support rod and the auxiliary hydraulic telescopic rod; M4, the inertial energy dissipation unit includes a swing assembly, which is fixed to the middle of the support rod, and the swing assembly includes a sealed cavity, a pendulum, and a shear thickening liquid filled in the cavity; M5, the energy closed-loop unit includes a piezoelectric energy conversion module and a supercapacitor, the piezoelectric energy conversion module is attached to the surface of the pendulum, and the supercapacitor is connected to the piezoelectric energy conversion module through a circuit; M6, the vibration sensing unit includes an acceleration sensor, and the acceleration sensor is installed on the gearbox housing; M7, the adaptive control unit is integrated into the suspension device bracket, which is configured to adjust the magnetic field strength and flow channel opening according to the vibration energy spectrum and distribute the supercapacitor power; It achieves full-band vibration isolation, targeted dissipation of characteristic-order energy, and self-circulation of energy. The main hydraulic telescopic rod uses high-viscosity silicone-based hydraulic oil to suppress low-frequency vibrations. The auxiliary hydraulic rod uses magnetorheological fluid magnetic field regulation to block the transmission of high-frequency vibrations. The dynamic compensation displacement of the pendulum in the inertial energy dissipation unit and the rheological response of the shear thickening fluid synergistically offset the characteristic-order vibration energy. The piezoelectric module and supercapacitor form a closed-loop power supply system, driving the electromagnetic adjustment mechanism and achieving energy self-sustaining. The vibration sensing unit analyzes the vibration energy distribution in real time. The adaptive control unit quickly tracks the main frequency changes and switches the adjustment parameters. Combined with the low-friction slide rail and anti-sedimentation fluid design, the vibration isolation efficiency and system durability are comprehensively improved.

[0007] Preferably, the main hydraulic telescopic rod is filled with silicon-based hydraulic oil with a viscosity of ≥5000 cSt, and the auxiliary hydraulic telescopic rod is filled with magnetorheological fluid, and an electromagnetic coil is arranged around the outer wall thereof.

[0008] Preferably, the magnetorheological fluid is formed by mixing carbonyl iron powder with a volume fraction of 20-35% and silicone oil-based liquid, and the magnetic field strength of the electromagnetic coil is satisfy: in, Tesla is the unit of magnetic field strength, is the main frequency of vibration, and its unit is .

[0009] Preferably, the surface of the linear slide rail is coated with a polytetrafluoroethylene coating with a thickness of 0.1-0.3 mm and a friction coefficient of ≤0.05, and the axial stroke of the linear slide rail is ±10 mm.

[0010] Preferably, the shear thickening fluid is a suspension of silica particles dispersed in polyethylene glycol, with a critical shear rate of 400-600s-1, an equivalent stiffness of 500-2000N / m, a particle size of 50-200nm, a volume fraction of 40-60%, and a molecular weight of 400-600Da for the polyethylene glycol.

[0011] Preferably, the piezoelectric energy conversion module is a PZT-5H piezoelectric ceramic piece, the electromechanical conversion efficiency of which is ≥15%, and the circuit connection impedance between the supercapacitor and the piezoelectric module is ≤0.1Ω.

[0012] Preferably, the sampling frequency of the vibration sensing unit is ≥1kHz, the main vibration frequency of the vibration sensing unit is extracted by a fast Fourier transform (FFT) algorithm, the number of sampling points is ≥1024, and the frequency resolution is ≤5Hz.

[0013] Preferably, when the 2nd-order or 4th-order component accounts for more than 50% of the vibration energy spectrum, the centrifugal displacement L of the pendulum satisfies: in, is the equivalent stiffness of the shear thickening fluid, which is 500-2000N / m. is the gearbox shaft angular velocity, its unit is rad / s, is the distance from the pendulum's center of mass to the center of rotation, which is 20-50mm; The mass of the pendulum is m=50-150g.

[0014] Another technical solution provided by the present invention is a vibration isolation method for an automobile transmission suspension device, comprising the following steps: S1. Collect vibration signals and generate energy spectrum. The gearbox vibration signal is collected by an acceleration sensor and a vibration energy spectrum is generated by fast Fourier transform. S2. Extract the main frequency and energy order, identify the main vibration frequency and energy concentration order, where the order is an integer multiple of the gearbox shaft speed; S3. Adjust the magnetic field strength and flow channel opening: When the main vibration frequency is ≤50Hz, set the magnetic field strength to 0.1T; When the main vibration frequency is between 50Hz and 150Hz, the magnetic field intensity increases by 0.02T per 1Hz as the frequency increases; When the main vibration frequency is >150Hz, set the magnetic field strength to 0.5T; Synchronously adjust the opening and closing degree of the shear thickening fluid flow channel; S4, triggering pendulum displacement compensation. When the proportion of 2nd-order or 4th-order energy exceeds 50%, the pendulum displacement is adjusted according to the gearbox shaft speed, pendulum mass, center of mass distance and shear thickening fluid stiffness; S5. Maintain closed-loop energy power supply, and use the electric energy stored in the supercapacitor to drive the electromagnetic coil and the flow channel regulating mechanism, so as to achieve an energy self-sufficiency rate of ≥80%.

[0015] Preferably, the main frequency of vibration When the sudden change exceeds 20%, the flow channel opening degree will be switched to a safe mode of ≥60% within 3 seconds.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The nested structure of the main hydraulic telescopic rod and the auxiliary hydraulic telescopic rod works synergistically. The main hydraulic rod provides high damping energy absorption in the low-frequency band through high-viscosity silicone-based hydraulic oil, and the auxiliary hydraulic rod dynamically hardens in the high-frequency band through magnetic field intensity adjustment of magnetorheological fluid, achieving full-band vibration energy attenuation from low to high frequencies, significantly reducing the vibration transmissibility of traditional suspension when switching between high and low frequencies.

[0017] 2. The pendulum of the inertial energy dissipation unit responds synergistically with the shear thickening fluid. When the gearbox shaft system's rotational imbalance triggers second- or fourth-order characteristic vibrations, the pendulum offsets the impact force through centrifugal displacement compensation. The shear thickening fluid triggers a rheological response at the critical shear rate, dynamically improving the equivalent stiffness, accurately locking and dissipating order resonance energy, and avoiding vehicle body resonance.

[0018] 3. The piezoelectric energy conversion module converts the mechanical energy of the pendulum vibration into electrical energy, stores it through supercapacitors, and directly drives the electromagnetic coil and flow channel regulation mechanism to form an energy self-circulating power supply system, significantly reducing dependence on external power supplies and improving system sustainability and energy efficiency.

[0019] 4. The vibration sensing unit combines the fast Fourier transform algorithm to analyze the vibration energy spectrum in real time, dynamically adjust the magnetic field strength and the opening and closing degree of the shear thickening fluid flow channel, and quickly respond when the vibration main frequency suddenly changes, realizing spectrum tracking and parameter matching of vibration energy, ensuring that control delay and tracking error are minimized.

[0020] 5. The low-friction coating of the linear guideway reduces axial displacement loss, and the nanoparticle dispersion stability of the shear thickening fluid inhibits liquid sedimentation. Combined with the sealing design of the hydraulic unit, it significantly improves component durability and long-term system reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic plan view of the suspension structure of the present invention; Figure 2 This is a flow chart of the vibration energy spectrum adaptive control of the present invention; Figure 3 Schematic diagram of the piezoelectric energy conversion module and supercapacitor closed-loop system of the present invention; Figure 4 This is a schematic diagram of the energy order vibration suppression principle of the present invention. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] To achieve the above objectives, the present invention is implemented through the following technical solutions: the present invention provides an automobile gearbox suspension device and a vibration isolation method thereof, combined with Figures 1 to 4 , the automobile gearbox suspension device comprises the following units: The frame connection unit includes a symmetrically designed fixing frame with upper and lower mounting interfaces respectively processed at the upper and lower ends. The fixing frame is cast with high-strength steel. The center distance of the lower interface is 200mm, the interface hole diameter is Φ18mm, and it is rigidly connected to the frame longitudinal beam through flange bolts; The upper mounting interface is hinged to the main hydraulic telescopic rod, and the lower mounting interface is hinged to the auxiliary hydraulic telescopic rod. Self-lubricating spherical bearings are configured at the hinges to ensure ±15° deflection freedom.

[0024] The hydraulic damping unit is composed of a nested main hydraulic telescopic rod and a secondary hydraulic telescopic rod. The inner cavity of the main hydraulic telescopic rod is filled with silicone-based hydraulic oil with a viscosity of ≥5000cSt. The volume of the silicone-based hydraulic oil accounts for 90% of the cavity volume, and the remainder is a nitrogen compensation chamber. The rod body of the main hydraulic telescopic rod is a double-layer stainless steel sleeve structure with a stroke of ±25mm. The upper end is connected to the upper mounting interface through a hinge pin. The auxiliary hydraulic telescopic rod is nested on the outside of the main hydraulic rod. The auxiliary hydraulic telescopic rod is filled with magnetorheological fluid and the outer wall is wound with an electromagnetic coil. The coil is electrically connected to the adaptive control unit. The lower end of the auxiliary hydraulic telescopic rod is connected to the lower mounting interface through a hinge pin. The stroke is ±15mm, forming a coaxial nested telescopic structure with the main hydraulic rod.

[0025] The power transmission unit consists of a support rod and a linear slide. One end of the support rod is connected to the gearbox fixed assembly frame through a three-degree-of-freedom ball joint. The ball joint has a deflection angle of ±12° and an axial stiffness of ≥500N / mm. The other end is processed into a T-shaped slider to form an axial sliding pair with the linear slide. The surface of the linear slide is coated with a polytetrafluoroethylene coating with a thickness of 0.2mm. The linear slide is 50mm long and has an axial stroke of ±10mm. The linear slide base is made of hard anodized aluminum alloy, and the slider is rigidly fixed to the outer wall of the auxiliary hydraulic telescopic rod.

[0026] The inertial energy dissipation unit is fixed in the middle of the support rod and includes a sealed cavity and a pendulum. The sealed cavity is made of polycarbonate and the inner cavity is filled with shear thickening fluid with a critical shear rate of 500s. -1, equivalent stiffness 1200N / m, adjustable flow channels are set at both ends of the sealing cavity, and the flow channel width is controlled by a micro stepping motor; The pendulum has a mass of 100g, the center of mass is 30mm away from the center of rotation, and the pendulum shaft is equipped with angular contact ball bearings. When the proportion of 2nd or 4th order vibration energy exceeds 50%, the centrifugal displacement of the pendulum is dynamically compensated according to the formula.

[0027] The energy closed-loop unit includes a piezoelectric module and a supercapacitor. The piezoelectric energy conversion module uses a PZT-5H piezoelectric ceramic sheet attached to the surface of the pendulum. The electromechanical conversion efficiency is ≥15%. The output end is connected to the supercapacitor through a rectifier circuit, and the circuit impedance is ≤0.1Ω. The supercapacitor uses MAXWELL 2.7V / 3000F monomer, and the energy storage module consists of 6 groups connected in parallel with a total capacity of 18kF and an output voltage of 5V. The capacitor group directly powers the electromagnetic coil, flow channel regulation motor and adaptive control unit.

[0028] The vibration sensing unit includes an acceleration sensor, which is installed on the side wall of the gearbox housing. The sampling frequency is ≥1kHz and the range is ±50g. The output signal is transmitted to the control unit after passing through an anti-aliasing filter and a cutoff frequency of 500Hz. The signal processing of the vibration sensing unit uses the FFT algorithm to generate a vibration energy spectrum, and extracts the main frequency and 2nd / 4th order energy ratio in real time. When the main frequency mutation rate exceeds 20%, the flow channel opening and closing degree switching instruction is triggered.

[0029] The adaptive control unit is an embedded controller that performs the following logic: According to the formula Dynamically control the electromagnetic coil current; Adjust the flow channel width according to the equivalent stiffness of the shear thickening fluid and the pendulum displacement L; The supercapacitor power is preferentially allocated to the electromagnetic coil, accounting for 60%, and the remaining 40% is used to power the flow channel motor and sensor.

[0030] The following combination Figures 1 to 4 The following is a further detailed description of an automobile gearbox suspension device and a vibration isolation method thereof according to the present invention: Example 1: Full-frequency vibration suppression and energy closed-loop operation When the vehicle is driving under comprehensive road conditions, the transmission vibration frequency ranges from 20Hz to 180Hz, including low-frequency congestion jitter, high-frequency high-speed noise, and second-order characteristic vibration energy concentration. First, the main hydraulic telescopic rod is filled with silicone-based hydraulic oil with a viscosity of no less than 5000 cSt. This hydraulic oil is hinged to the frame rail via a mounting interface on the frame connection unit's fixed bracket. The main hydraulic rod provides high damping and energy absorption in the low-frequency range of 20Hz to 50Hz to suppress vehicle body sway. The auxiliary hydraulic telescopic rod is nested outside the main hydraulic rod. The magnetorheological fluid inside it is a mixture of 25% carbonyl iron powder and silicone oil. The initial magnetic field strength is set to 0.1T. The magnetorheological fluid maintains a low viscosity to avoid superposition with the main hydraulic rod's damping, resulting in excessive rigidity. Next, an accelerometer mounted on the transmission housing samples vibration signals at a sampling frequency of 1kHz, and the dominant vibration frequency is extracted using a fast Fourier transform algorithm. When the dominant frequency rises to 150Hz, the adaptive control unit increases the electromagnetic coil current by 0.02T per 1Hz, according to a magnetic field strength adjustment formula. This increases the magnetic field strength to 0.3T, and the magnetorheological fluid dynamic stiffness increases to 2.0kN / mm, thus blocking the high-frequency vibration transmission path. Then, when the vibration energy spectrum shows that the proportion of the second-order component exceeds 50%, the pendulum in the middle of the support rod starts displacement compensation. The mass of the pendulum is 100 grams, and the center of mass is 30 mm away from the center of rotation. The centrifugal displacement is calculated to be 1.8 mm based on the angular velocity of the gearbox shaft, which counteracts the rotational imbalance force. The shear thickening fluid is composed of 50% volume fraction of silica particles dispersed in a polyethylene glycol base liquid. When the shear rate reaches 500s -1 When the equivalent stiffness rises to 1500N / m, the opening and closing degree of the flow channel in the sealing cavity is switched to 40%, locking the vibration energy; Finally, the piezoelectric energy conversion module uses PZT-5H piezoelectric ceramic sheets, which are attached to the surface of the pendulum to convert vibration mechanical energy into electrical energy; the electrical energy is input into the supercapacitor through the rectifier circuit, and the supercapacitor circuit connection impedance does not exceed 0.1Ω; the capacitor outputs a 5V voltage, of which 60% of the electrical energy drives the electromagnetic coil, 30% is supplied to the flow channel adjustment stepper motor, and the remaining 10% maintains the operation of the sensor and control unit. The system's energy self-sufficiency rate is not less than 80%.

[0031] Example 2: Verification of rapid suppression of order resonance and long-term stability During engine start and stop, hybrid vehicles experience sudden second-order vibration excitation in the transmission shaft system, triggering vehicle body resonance. This requires rapid response and component durability verification. First, the vibration sensing unit completes a 1024-point fast Fourier transform calculation within 50 milliseconds, with a frequency resolution of no more than 5Hz, and identifies that the proportion of second-order vibration energy exceeds the threshold. The pendulum has a mass of 120 grams, and its center of mass is 40mm from the center of rotation. The angular velocity calculated based on the gearbox shaft speed is 40π radians per second, corresponding to a 20Hz main frequency. The displacement calculated by the formula is 2.5mm, and reverse compensation is initiated. Then, the opening degree of the shear thickening fluid flow channel was adjusted to 30% according to the equivalent stiffness requirement to restrict the flow of the shear thickening fluid; the shear thickening fluid was composed of silica particles with a volume fraction of 55%, and the shear rate reached 600s -1 When the equivalent stiffness is increased to 1800N / m, the rheological response time in the sealing cavity does not exceed 10 milliseconds, and the resonance energy is absorbed instantly; Then, when the peak pressure of the main hydraulic telescopic rod reaches 4.5 MPa, excess silicone oil is discharged through the built-in pressure relief valve to avoid overload of the cavity; the surface of the linear slide rail is coated with a polytetrafluoroethylene coating with a thickness of 0.2 mm, and the friction coefficient does not exceed 0.05. Within the axial displacement of plus or minus 10 mm, the friction power consumption does not exceed 0.08 watts, reducing mechanical wear.

[0032] Example 3: Energy self-sustaining and adaptive control verification under extreme working conditions Under heavy-load climbing and long downhill braking conditions, the transmission experiences continuous vibration energy input and frequent frequency domain mutations, verifying the system's energy supply stability and adaptability to extreme operating conditions. First, the vibration sensing unit captures vibration signals at a sampling frequency of 1kHz. Using a sliding-window fast Fourier transform algorithm, the spectrum is updated every second to identify sudden changes in the dominant frequency to 160Hz. The mutation rate is calculated as 160Hz minus 30Hz, divided by 30Hz and multiplied by 100%, resulting in a value of 433%, far exceeding the 20% threshold. Next, the electromagnetic coil current increases the magnetic field strength from 0.1T to 0.5T within 3 seconds, causing the dynamic stiffness of the magnetorheological fluid to soar to 3.5 kilonewtons per millimeter. The flow channel adjustment stepper motor switches the opening and closing degree from 70% to 60% within 3 seconds, increasing the equivalent stiffness of the shear thickening fluid to 2000 Newtons per meter. Then, under the large displacement working condition of the pendulum, the displacement is 3.0 mm, the output current of the PZT-5H piezoelectric ceramic piece is not less than 80 mA, and the instantaneous charging power of the supercapacitor is not less than 5 watts. 90% of the output power of the supercapacitor is supplied to the electromagnetic coil, and 10% maintains the operation of the flow channel motor to ensure the hardening priority of the magnetorheological fluid; Finally, when the temperature of the silicone oil cavity of the main hydraulic telescopic rod is monitored to 120 degrees Celsius, the adaptive control unit triggers the load reduction mode, and prioritizes reducing the electromagnetic coil current through the energy distribution strategy; the magnetorheological fluid base liquid is mixed with the silicone oil base liquid based on carbonyl iron powder to maintain viscosity stability under high-frequency shear; the sealed cavity of the inertial energy consumption unit is made of polycarbonate material to ensure structural integrity under extreme temperature conditions.

[0033] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0034] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An automobile gearbox suspension device, characterized in that: It consists of the following units: M1, the frame connection unit includes a fixing frame, which is fixed to the vehicle frame and has a hydraulic telescopic rod mounting interface symmetrically provided on the upper and lower sides; M2, the hydraulic damping unit includes a main hydraulic telescopic rod and a secondary hydraulic telescopic rod, the main hydraulic telescopic rod is hinged to the upper mounting interface of the fixing frame, and the secondary hydraulic telescopic rod is hinged to the lower mounting interface of the fixing frame and nested outside the main hydraulic telescopic rod; M3, the power transmission unit includes a support rod, one end of which is connected to the gearbox fixed assembly frame through a three-degree-of-freedom ball joint, and the other end is sleeved on the outside of the auxiliary hydraulic telescopic rod. A linear slide is used to form an axial displacement constraint between the support rod and the auxiliary hydraulic telescopic rod; M4, the inertial energy dissipation unit includes a swing assembly, which is fixed to the middle of the support rod, and the swing assembly includes a sealed cavity, a pendulum, and a shear thickening liquid filled in the cavity; M5, the energy closed-loop unit includes a piezoelectric energy conversion module and a supercapacitor, the piezoelectric energy conversion module is attached to the surface of the pendulum, and the supercapacitor is connected to the piezoelectric energy conversion module through a circuit; M6, the vibration sensing unit includes an acceleration sensor, and the acceleration sensor is installed on the gearbox housing; M7, the adaptive control unit is integrated into the suspension device bracket, which is configured to adjust the magnetic field strength and flow channel opening according to the vibration energy spectrum and distribute the supercapacitor power.

2. The automobile transmission suspension device according to claim 1, characterized in that: The main hydraulic telescopic rod is filled with silicon-based hydraulic oil with a viscosity of ≥5000 cSt, and the auxiliary hydraulic telescopic rod is filled with magnetorheological fluid. An electromagnetic coil is arranged around the outer wall of the auxiliary hydraulic telescopic rod.

3. The automobile transmission suspension device according to claim 2, characterized in that: The magnetorheological fluid is made of a mixture of carbonyl iron powder with a volume fraction of 20-35% and silicone oil-based liquid. The magnetic field strength of the electromagnetic coil is satisfy: in, Tesla is the unit of magnetic field strength, is the main frequency of vibration, and its unit is .

4. The automobile transmission suspension device according to claim 1, characterized in that: The surface of the linear slide rail is coated with a polytetrafluoroethylene coating with a thickness of 0.1-0.3 mm and a friction coefficient of ≤0.05, and the axial stroke of the linear slide rail is ±10 mm.

5. The automobile transmission suspension device according to claim 1, characterized in that: The shear thickening fluid is a suspension of silicon dioxide particles dispersed in polyethylene glycol, with a critical shear rate of 400-600s -1 , equivalent stiffness 500-2000 N / m, the particle size of the silica is 50-200 nm, its volume fraction is 40-60%, and the molecular weight of the polyethylene glycol is 400-600 Da.

6. The automobile transmission suspension device according to claim 1, characterized in that: The piezoelectric energy conversion module is a PZT-5H piezoelectric ceramic piece, and its electromechanical conversion efficiency is ≥15%. The circuit connection impedance between the supercapacitor and the piezoelectric module is ≤0.1Ω.

7. The automobile transmission suspension device according to claim 6, characterized in that: The sampling frequency of the vibration sensing unit is ≥1kHz, the main vibration frequency of the vibration sensing unit is extracted by a fast Fourier transform (FFT) algorithm, the number of sampling points is ≥1024, and the frequency resolution is ≤5Hz.

8. The automobile transmission suspension device according to claim 7, characterized in that: When the 2nd-order or 4th-order component accounts for more than 50% of the vibration energy spectrum, the centrifugal displacement L of the pendulum satisfies: in, is the equivalent stiffness of the shear thickening fluid, which is 500-2000N / m. is the gearbox shaft angular velocity, its unit is rad / s, is the distance from the pendulum's center of mass to the center of rotation, which is 20-50mm; The mass of the pendulum is m=50-150g.

9. A vibration isolation method for an automobile transmission suspension device according to claims 1-8, characterized in that: The following steps are involved: S1. Collect vibration signals and generate energy spectrum. The gearbox vibration signal is collected by an acceleration sensor and a vibration energy spectrum is generated by fast Fourier transform. S2. Extract the main frequency and energy order, identify the main vibration frequency and energy concentration order, where the order is an integer multiple of the gearbox shaft speed; S3. Adjust the magnetic field strength and flow channel opening: When the main vibration frequency is ≤50Hz, set the magnetic field strength to 0.1T; When the main vibration frequency is between 50Hz and 150Hz, the magnetic field intensity increases by 0.02T per 1Hz as the frequency increases; When the main vibration frequency is >150Hz, set the magnetic field strength to 0.5T; Synchronously adjust the opening and closing degree of the shear thickening fluid flow channel; S4, triggering pendulum displacement compensation. When the proportion of 2nd-order or 4th-order energy exceeds 50%, the pendulum displacement is adjusted according to the gearbox shaft speed, pendulum mass, center of mass distance and shear thickening fluid stiffness; S5. Maintain closed-loop energy power supply, and use the electric energy stored in the supercapacitor to drive the electromagnetic coil and the flow channel regulating mechanism, so as to achieve an energy self-sufficiency rate of ≥80%.

10. The vibration isolation method for an automobile transmission suspension device according to claim 9, characterized in that: The main frequency of vibration When the sudden change exceeds 20%, the flow channel opening degree will be switched to a safe mode of ≥60% within 3 seconds.

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