Design method, system and equipment for thin spoke vibration reduction gear

Abstract

The invention discloses a thin spoke vibration reduction gear design method, system and equipment, and belongs to the field of mechanical design. The problem that in the prior art, high-frequency sound radiation noise in the thin spoke gear transmission process is difficult to reduce is solved. The vibration reduction seams are evenly formed in the thin spoke of the gear in a linear cutting mode and the like, the local resonance pieces divided by the vibration reduction seams absorb part of vibration energy through the vibration mode coupling effect with the rest part of the thin spoke body, and noise radiated by the local resonance pieces and radiation noise of the rest part of the thin spoke body are mutually counteracted; and therefore, the vibration noise level of the thin spoke gear is further reduced. Compared with a traditional gear vibration and noise reduction method, the method is simple in machining process, low in cost, reliable in structure and capable of adapting to high-temperature and high-speed use environments in the fields of aviation and the like.

Description

Technical Field

[0001] The invention relates to a design method, system and equipment for a thin spoke vibration-damping gear, and belongs to the field of mechanical design. Background Art

[0002] In industrial production, gear transmission has the advantages of high transmission efficiency, compact structure, precise transmission, long life and high reliability. Among them, thin spoke gears are light in weight and save space, and are widely used in aerospace, medical equipment, optical equipment and other fields. In the process of gear transmission, there are vibration problems such as meshing excitation, spoke resonance, and torsional vibration. Due to the ultra-thin structural characteristics of thin spoke gears, the structural acoustic coupling effect is obvious, and the vibration energy is mainly expressed in the form of sound radiation, especially in high-frequency bands such as meshing frequency. Existing gear vibration reduction and noise reduction methods mostly take measures against the vibration source and transmission path, such as reducing the meshing point error by optimizing the tooth shape, thereby reducing the vibration energy from the source; another example is to set a damping vibration reduction structure on the gear spoke, the gear shaft support bearing, and the housing, or to set a rubber vibration reduction seat on the gear support box, thereby reducing the vibration energy on the transmission path. The above methods have a good effect on low-frequency vibration reduction, but a limited effect on high-frequency vibration. In addition, the way to set the damping vibration reduction structure is also limited by the structure of thin spoke gears. Usually, the process is complex, the cost is high, and the reliability is low. It is not suitable for high-temperature and high-speed use environments in aviation and other fields. Summary of the invention

[0003] The present invention aims to solve the problem that it is difficult to reduce high-frequency sound radiation noise in the transmission process of thin-spoke gears in the prior art, and to provide a design method for thin-spoke vibration-damping gears.

[0004] A design method for a thin spoke vibration-damping gear comprises the following steps:

[0005] Step 1: Modal analysis of thin spoke gears: using the operating conditions, materials, and geometric parameters of the thin spoke gears to perform modal analysis, and analyzing the vibration mode and frequency of the sound radiation generated by the thin spoke gears;

[0006] Step 2: Harmonic response analysis of thin spoke gears: Perform structural harmonic response analysis and acoustic harmonic response analysis on thin spoke gears to confirm the frequency range of thin spoke gears that require vibration and noise reduction within the operating frequency range;

[0007] Step 3, designing a thin spoke vibration-damping gear structure: the thin spoke gear comprises a thin spoke gear body and a vibration-damping seam part, wherein the thin spoke gear body comprises a gear, a thin spoke, and a mounting hub, and n vibration-damping seam parts are evenly arranged on the thin spoke, and the vibration-damping seam part comprises a vibration-damping seam and a local resonance plate;

[0008] Step 4: design the parameters of the thin spoke vibration reduction gear according to the acoustic radiation vibration mode and frequency determined in steps 1 and 2, and the frequency range within the operating frequency range where vibration and noise reduction are required;

[0009] Step 5: Perform an acoustic harmonic response analysis on the thin spoke damping gear using the parameters described in step 4;

[0010] Step six, compare the harmonic response analysis results described in step four with the harmonic response analysis results described in step two, and compare the far-reaching noise of the thin-spoke vibration-damping gear and the gear of the same size without a vibration-damping seam design. If the vibration-damping effect does not meet expectations, re-implement the process of steps four and five to iterate the vibration-damping gear parameters until the thin-spoke vibration-damping gear ratio and the far-reaching noise of the gear of the same size without a vibration-damping design in the long-term working frequency band are lower than the set threshold, thereby obtaining the optimal design.

[0011] Among them, the operating conditions of the thin spoke gear described in step 1 include rotation speed, load, and torque.

[0012] The parameters of the thin spoke vibration-damping gear in step 4 include: the number n of the local vibration-damping seams (20), the pitch circle diameter D of the n local vibration-damping seams (20) evenly distributed on the thin spoke (12), the width B and length L of the local resonance plate (22), and the width b of the vibration-damping seam (21).

[0013] A thin spoke vibration damping gear design system, comprising a modal analysis unit, a harmonic response analysis unit, a parameter design unit, and an analysis and comparison unit;

[0014] Modal analysis unit: using the use conditions, materials, and geometric parameters of the thin spoke gear to perform modal analysis, and analyzing the vibration mode and frequency of the sound radiation generated by the thin spoke gear;

[0015] Harmonic response analysis unit: Perform structural harmonic response analysis and acoustic harmonic response analysis on thin spoke gears to confirm the frequency range of thin spoke gears that require vibration and noise reduction within the operating frequency range;

[0016] Parameter design unit: Design the parameters of the thin spoke vibration damping gear according to the structure of the thin spoke vibration damping gear and the sound radiation vibration mode and frequency determined by the modal analysis unit and the harmonic response analysis unit, and the frequency range within the operating frequency range that requires vibration and noise reduction;

[0017] Analysis and comparison unit: Perform acoustic harmonic response analysis on the thin spoke vibration damping gear designed by the parameter design unit, and compare the far-reaching noise of the thin spoke vibration damping gear with that of the gear without vibration damping seam design. If the vibration damping effect does not meet expectations, return to the parameter design unit, adjust the design parameters for iteration, until the far-reaching noise of the thin spoke vibration damping gear ratio and the gear of the same size without vibration damping design in the long-term working frequency band is lower than the set threshold, thereby obtaining the optimal design.

[0018] A computer storage medium stores at least one instruction, which is loaded and executed by a processor to design a thin spoke vibration-damping gear.

[0019] A thin spoke vibration damping gear design device comprises a processor and a memory. The memory stores at least one instruction. The at least one instruction is loaded and executed by the processor.

[0020] The beneficial effects of the present invention are:

[0021] The present invention evenly arranges vibration-damping seams on the thin spokes of the gear by means of wire cutting or the like. The local resonance plates separated by the vibration-damping seams absorb part of the vibration energy through the vibration mode coupling effect with the rest of the thin spoke body, and the noise radiated by the local resonance plates offsets the noise radiated by the rest of the thin spoke body, thereby further reducing the vibration noise level of the thin spoke gear. Compared with the traditional gear vibration and noise reduction method, the present method has simple processing technology, low cost, reliable structure, and can adapt to the high-temperature and high-speed use environment in the fields of aviation and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is the front view of the thin-spoke vibration-damping gear;

[0023] Figure 2 This is the AA direction view of the thin spoke vibration damping gear;

[0024] Figure 3 A partial view of the vibration-absorbing seam of the thin-spoke vibration-absorbing gear;

[0025] Figure 4 The simulation result of the far-reaching noise of the thin spoke vibration-damping gear of the preferred embodiment;

[0026] Figure 5 Comparison of the simulation results of the noise emitted by the thin spoke vibration-damping gear of the preferred embodiment and the thin spoke gear without vibration-damping;

[0027] Figure 6 Flowchart of design method for thin spoke vibration damping gear. DETAILED DESCRIPTION Specific implementation method one:

[0029] This embodiment is a design method for a thin spoke vibration-damping gear, and the specific embodiment is described in conjunction with the accompanying drawings, including the following steps:

[0030] Step 1: Modal analysis of thin spoke gears: collect the use conditions, materials, and geometric parameters of the thin spoke gears, use simulation software to build a model, and perform modal analysis to analyze the vibration mode and frequency of the sound radiation generated by the thin spoke gears;

[0031] Step 2: Harmonic response analysis of thin spoke gears: Based on the modal simulation, set the speed and load of the actual working condition, perform structural harmonic response analysis and acoustic harmonic response analysis on the thin spoke gears, and confirm the frequency range of the thin spoke gears that need vibration and noise reduction within the working frequency range;

[0032] Step 3: Design the thin spoke vibration reduction gear structure: Figure 1 , 2 As shown in , 3, the thin spoke gear comprises a thin spoke gear body 10 and a vibration-damping slit local 20, wherein the thin spoke gear body comprises a gear 11, a thin spoke 12 with a thickness of H, and a mounting hub 13, and n vibration-damping slit locals 20 are evenly arranged on the thin spoke 12, and the n vibration-damping slit locals 20 are evenly distributed on a pitch circle with a diameter of D at intervals of φ°, and the vibration-damping slit locals 20 comprise a vibration-damping slit 21 and a local resonance plate 22;

[0033] Step 4: Design the parameters of the thin spoke vibration-damping gear according to the acoustic radiation vibration mode and frequency determined in Step 1 and Step 2 and the frequency range for vibration reduction, including the number n of the vibration-damping slits 20, the pitch circle diameter D of the n vibration-damping slits 20 evenly distributed on the thin spoke 12, the width B and length L of the local resonance plate 22, and the width b of the vibration-damping slit 21; the parameters of the vibration-damping slits 20 determine the local natural frequency and vibration mode of the vibration-damping slits 20, and the distribution pattern n×φ° of the vibration-damping slits 20 on the thin spoke 12 determines the coupling form of the local natural frequency and vibration mode of the vibration-damping slits 20 and the natural frequency and vibration mode of the thin spoke gear body 10;

[0034] Step 5: Perform an acoustic harmonic response analysis on the gear using the resonant slot parameters described in step 4, and determine the vibration reduction effect through simulation calculation.

[0035] Step six, compare the harmonic response analysis results described in step four with the harmonic response analysis results described in step two, and compare the far-reaching noise of the thin-spoke vibration-damping gear and the gear of the same size without a vibration-damping seam design. If the vibration-damping effect does not meet expectations, re-implement the process of steps four and five to iterate the vibration-damping gear parameters until the thin-spoke vibration-damping gear ratio and the far-reaching noise of the gear of the same size without a vibration-damping design in the long-term working frequency band are lower than the set threshold, thereby obtaining the optimal design.

[0036] Among them, the operating conditions of the thin spoke gear described in step 1 include rotation speed, load, and torque. Specific implementation method 2:

[0038] This embodiment is a thin spoke vibration damping gear design system, including:

[0039] Modal analysis unit: using the use conditions, materials, and geometric parameters of the thin spoke gear to perform modal analysis, and analyzing the vibration mode and frequency of the sound radiation generated by the thin spoke gear;

[0040] Harmonic response analysis unit: Perform structural harmonic response analysis and acoustic harmonic response analysis on thin spoke gears to confirm the frequency range of thin spoke gears that require vibration and noise reduction within the operating frequency range;

[0041] Parameter design unit: Design the parameters of the thin spoke vibration damping gear according to the structure of the thin spoke vibration damping gear and the sound radiation vibration mode and frequency determined by the modal analysis unit and the harmonic response analysis unit, and the frequency range within the operating frequency range that requires vibration and noise reduction;

[0042] Analysis and comparison unit: Perform acoustic harmonic response analysis on the thin spoke vibration damping gear designed by the parameter design unit, and compare the far-reaching noise of the thin spoke vibration damping gear with that of the gear without vibration damping seam design. If the vibration damping effect does not meet expectations, return to the parameter design unit, adjust the design parameters for iteration, until the far-reaching noise of the thin spoke vibration damping gear ratio and the gear of the same size without vibration damping design in the long-term working frequency band is lower than the set threshold, thereby obtaining the optimal design.

[0043] The operating conditions of the thin spoke gear include rotation speed, load and torque.

[0044] The parameters of the thin spoke vibration damping gear include: the number n of the local vibration damping slots 20 , the pitch circle diameter D of the n local vibration damping slots 20 evenly distributed on the thin spoke 12 , the width B and length L of the local resonance plate 22 , and the width b of the vibration damping slot 21 . Specific implementation method three:

[0046] This embodiment is a computer storage medium, wherein at least one instruction is stored in the storage medium, and the at least one instruction is loaded by a processor to run the thin spoke vibration-damping gear design system.

[0047] It should be understood that the instructions include computer program products, software or computerized methods corresponding to any method described in the present invention; the instructions can be used to program a computer system or other electronic device. Computer storage media may include readable media on which instructions are stored, including but not limited to magnetic storage media, optical storage media; magneto-optical storage media include read-only memory ROM, random access memory RAM, erasable programmable memory (e.g., EPROM and EEPROM) and flash memory layers, or other types of media suitable for storing electronic instructions. Specific implementation method four:

[0049] This embodiment is a device, and the device includes a processor and a memory. It should be understood that including any device including a processor and a memory described in the present invention, the device may also include other units and modules that perform display, interaction, processing, control, etc. and other functions through signals or instructions;

[0050] At least one instruction is stored in the memory, and the at least one instruction is loaded and executed by the processor to execute the thin spoke vibration-damping gear design system.

[0051] Those skilled in the art will appreciate that at least one instruction stored is a computer program product corresponding to the method or system. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes. The scheme in the embodiment of the present application can be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0052] The present application is described with reference to the flowcharts and / or block diagrams of the methods, systems, and computer program products according to the embodiments of the present application, and may also be used for corresponding devices. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0053] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0054] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0055] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0056] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

[0057] The above calculation examples of the present invention are only used to illustrate the design concept and process of the present invention in detail, and are not intended to limit the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the scope of protection of the present invention.

[0058] Example:

[0059] This embodiment is a preferred solution of a design method for a thin spoke vibration-damping gear, and this embodiment is described in conjunction with the accompanying drawings:

[0060] The dimensions of the thin spoke gear are 69 mm in diameter, 6 mm in tooth width, 15 mm in diameter at the hub, and a thickness H of the thin spoke 12 of 2 mm.

[0061] First, a modal analysis is performed to analyze the vibration mode and frequency of the sound radiation generated by the thin spoke gear. On this basis, the speed and load of the actual working condition are set, and the structural harmonic response analysis and acoustic harmonic response analysis of the thin spoke gear are performed to confirm the frequency range of the thin spoke gear that needs vibration and noise reduction within the working frequency range. The simulation calculation for this example found that the air radiation noise in the long-term working frequency range of 1500-4800Hz within its working frequency band of 0-4800Hz is relatively large, and the human ear is sensitive to noise in the frequency band of 1000-3000Hz, thus confirming that a vibration reduction design is performed for the long-term working frequency range of 1500-4800Hz.

[0062] Then design the thin spoke vibration reduction gear structure: Figure 1 , 2As shown in , 3, the thin spoke gear includes a thin spoke gear body 10 and a vibration-damping seam local 20. Five vibration-damping seam locals 20 are evenly arranged on the thin spoke 12. The five vibration-damping seam locals 20 are evenly distributed on a pitch circle with a diameter D of 37.5 mm. The vibration-damping seam local 20 includes a vibration-damping seam 21 and a local resonance plate 22. The width b of the vibration-damping seam 21 is 0.5 mm. The length L of the local resonance plate 22 is 4 mm, and the width B is 2 mm.

[0063] The thin spoke vibration damping gear is subjected to acoustic harmonic response analysis, such as Figure 4 As shown in the figure, it can be seen that the thin spoke gear does have the problem of acoustic radiation noise under the high-frequency vibration excitation such as the meshing frequency under the action of the structural acoustic coupling effect, and the thin spoke is the main source of noise emission. The harmonic response analysis results are compared with the harmonic response analysis results of the gear of the same size without vibration reduction design, and the far-reaching noise of the two gears is compared, such as Figure 5 As shown, within the analysis bandwidth range of 0-4800 Hz, specifically within the range of 1100-4800 Hz, the far-reaching noise of the preferred embodiment is 2 dBA lower on average than that of a thin-spoke gear of the same size without a vibration reduction design.

Claims

1. A design method for a thin spoke vibration damping gear, characterized in that: The method comprises the following steps: Step 1: Modal analysis of thin spoke gears: using the operating conditions, materials, and geometric parameters of the thin spoke gears to perform modal analysis, and analyzing the vibration mode and frequency of the sound radiation generated by the thin spoke gears; Step 2: Harmonic response analysis of thin spoke gears: Perform structural harmonic response analysis and acoustic harmonic response analysis on thin spoke gears to confirm the frequency range of thin spoke gears that require vibration and noise reduction within the operating frequency range; Step 3, designing a thin spoke vibration-damping gear structure: the thin spoke gear comprises a thin spoke gear body (10) and a vibration-damping seam local portion (20), wherein the thin spoke gear body comprises a gear (11), a thin spoke (12), and a mounting hub (13), and n vibration-damping seam local portions (20) are evenly arranged on the thin spoke (12), and the vibration-damping seam local portion (20) comprises a vibration-damping seam (21) and a local resonance plate (22); Step 4: design the parameters of the thin spoke vibration reduction gear according to the acoustic radiation vibration mode and frequency determined in steps 1 and 2, and the frequency range within the operating frequency range where vibration and noise reduction are required; Step 5: Perform an acoustic harmonic response analysis on the thin spoke vibration damping gear using the parameters described in step 4; Step six, compare the harmonic response analysis results described in step four with the harmonic response analysis results described in step two, and compare the far-reaching noise of the thin-spoke vibration-damping gear and the gear of the same size without a vibration-damping seam design. If the vibration-damping effect does not meet expectations, re-implement the process of steps four and five to iterate the vibration-damping gear parameters until the thin-spoke vibration-damping gear ratio and the far-reaching noise of the gear of the same size without a vibration-damping design in the long-term working frequency band are lower than the set threshold, thereby obtaining the optimal design.

2. A method for designing a thin spoke vibration damping gear according to claim 1, characterized in that: The operating conditions of the thin spoke gear in step 1 include rotation speed, load, and torque.

3. The design method of a thin spoke vibration damping gear according to claim 1, characterized in that: The parameters of the thin spoke vibration-damping gear in step 4 include: the number n of the local vibration-damping seams (20), the pitch circle diameter D of the n local vibration-damping seams (20) evenly distributed on the thin spoke (12), the width B and length L of the local resonance plate (22), and the width b of the vibration-damping seam (21).

4. A thin spoke vibration damping gear design system, characterized in that: include: Modal analysis unit: using the use conditions, materials, and geometric parameters of the thin spoke gear to perform modal analysis, and analyzing the vibration mode and frequency of the sound radiation generated by the thin spoke gear; Harmonic response analysis unit: Perform structural harmonic response analysis and acoustic harmonic response analysis on thin spoke gears to confirm the frequency range of thin spoke gears that require vibration and noise reduction within the operating frequency range; Parameter design unit: Design the parameters of the thin spoke vibration damping gear according to the structure of the thin spoke vibration damping gear and the sound radiation vibration mode and frequency determined by the modal analysis unit and the harmonic response analysis unit, and the frequency range within the operating frequency range that requires vibration and noise reduction; Analysis and comparison unit: Perform acoustic harmonic response analysis on the thin spoke vibration damping gear designed by the parameter design unit, and compare the far-reaching noise of the thin spoke vibration damping gear with that of the gear without vibration damping design. If the vibration damping effect does not meet expectations, return to the parameter design unit, adjust the design parameters for iteration, until the far-reaching noise of the thin spoke vibration damping gear ratio and the gear of the same size without vibration damping design in the long-term working frequency band is lower than the set threshold, thereby obtaining the optimal design.

5. A thin spoke damping gear design system according to claim 4, characterized in that: The operating conditions of the thin spoke gear include rotation speed, load and torque.

6. A thin spoke damping gear design system according to claim 4, characterized in that: The parameters of the thin spoke vibration-damping gear include: the number n of the vibration-damping slit parts (20), the pitch circle diameter D of the n vibration-damping slit parts (20) evenly distributed on the thin spoke (12), the width B and length L of the local resonance plate (22), and the width b of the vibration-damping slit (21).

7. A computer storage medium, characterized in that: The storage medium stores at least one instruction, and the at least one instruction is loaded and executed by the processor to execute the thin spoke vibration damping gear design system according to any one of claims 4 to 6.

8. A thin spoke vibration damping gear design device, characterized in that: The device comprises a processor and a memory, wherein the memory stores at least one instruction, and the at least one instruction is loaded and executed by the processor to execute the thin spoke vibration-damping gear design system according to any one of claims 4 to 6.

Images