A thin-spoke damping gear design method, system and device

Abstract

The application discloses a kind of thin spoke vibration reduction gear design method, system and equipment, belong to mechanical design field.The present application solves the problem that existing technology is difficult to reduce the high-frequency sound radiation noise in the process of thin spoke gear transmission.The present application is evenly set on the thin spoke of gear through wire cutting and the like Vibration reduction slit, partial resonance piece divided by vibration reduction slit absorbs part vibration energy by vibration mode coupling effect with the rest of thin spoke body, and the noise radiated by partial resonance piece and the radiation noise of the rest of thin spoke body are mutually offset, so as to further reduce the vibration noise level of thin spoke gear.Compared with the traditional gear vibration reduction and noise reduction method, the present application has simple processing technology, low cost and reliable structure, and can adapt to high temperature and high speed use environment in aviation field.

Description

TECHNICAL FIELD

[0001] The present application relates to a thin-spoke damping gear design method, system and device, belonging to the field of mechanical design. BACKGROUND

[0002] In industrial production, gear transmission has the advantages of high transmission efficiency, compact structure, accurate transmission, long service life and high reliability. Thin-spoke gear is widely used in the fields of aerospace, medical equipment and optical equipment due to its light weight and space saving. During gear transmission, there are problems such as meshing excitation, spoke resonance and torsional vibration. Due to the ultra-thin structure of thin-spoke gear, the structural acoustic coupling effect is obvious, and the vibration energy is mainly in the form of acoustic radiation, especially at high frequencies such as meshing frequency. The existing gear damping and noise reduction methods are mainly to take measures on the vibration source and transmission path, such as optimizing the tooth profile to reduce the meshing point error, thereby reducing the vibration energy from the source; or setting damping structures on the gear spoke, gear shaft support bearing and shell, or setting rubber damping seats on the gear support box, thereby reducing the vibration energy on the transmission path. The above methods have good damping effect on low-frequency vibration, but limited effect on high-frequency vibration. Moreover, the setting of damping structures is limited by the structure of thin-spoke gear, and the process is usually complex, the cost is high, the reliability is low, and it is not suitable for high-temperature and high-speed environments in the field of aviation. SUMMARY

[0003] The present application is to solve the problem that the prior art cannot reduce the high-frequency acoustic radiation noise in the process of thin-spoke gear transmission, and provides a thin-spoke damping gear design method.

[0004] A thin-spoke damping gear design method, comprising the following steps:

[0005] Step one, modal analysis of thin-spoke gear: modal analysis is performed on the thin-spoke gear based on its working conditions, materials and geometric parameters to analyze the vibration mode and frequency of acoustic radiation of the thin-spoke gear;

[0006] Step two, harmonic response analysis of thin-spoke gear: structural harmonic response analysis and acoustic harmonic response analysis are performed on the thin-spoke gear to determine the frequency range that needs to be damped and noise-reduced within the working frequency range of the thin-spoke gear;

[0007] Step three, design of thin-spoke damping gear structure: the thin-spoke gear includes a thin-spoke gear body and a damping seam local part, wherein the thin-spoke gear body includes a gear, a thin spoke and a mounting hub, the thin spoke is uniformly provided with n damping seam local parts, and the damping seam local part includes a damping seam and a local resonant piece;

[0008] Step four, design the parameters of the thin-spoke damping gear according to the acoustic radiation mode and frequency determined in steps one and two, and the frequency range that needs to be damped and noise-reduced within the working frequency range.

[0009] Step five, acoustic harmonic response analysis of the thin-spoke damping gear using the parameters described in step four;

[0010] Step six, compare the harmonic response analysis results described in step four with the harmonic response analysis results described in step two, compare the far-field noise of the thin-spoke damping gear with the gear of the same size without designing damping slots, if the damping effect does not meet the expectation, re-implement the process of step four and step five to iterate the parameters of the damping gear, until the far-field noise of the thin-spoke damping gear is lower than the set threshold value than the gear of the same size without damping design in the long-time working frequency band, so as to obtain the optimal design.

[0011] Wherein, the working conditions of the thin-spoke gear described in step one include speed, load, torque.

[0012] Wherein, the parameters of the thin-spoke damping gear described in step four include: the number n of damping slot local parts (20), the pitch circle diameter D of the n evenly distributed damping slot local parts (20) on the thin-spoke (12), the width B and length L of the local resonant piece (22), and the width b of the damping slot (21).

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

[0014] Modal analysis unit: modal analysis is performed using the working conditions, materials, and geometric parameters of the thin-spoke gear to analyze the vibration mode and frequency of the thin-spoke gear producing acoustic radiation;

[0015] Harmonic response analysis unit: structural harmonic response analysis and acoustic harmonic response analysis are performed on the thin-spoke gear to determine the frequency range that needs to be damped and noise-reduced within the working frequency range of the thin-spoke gear;

[0016] Parameter design unit: based on the structure of the thin-spoke damping gear and the vibration mode and frequency determined by the modal analysis unit and the harmonic response analysis unit, the frequency range that needs to be damped and noise-reduced within the working frequency range, the parameters of the thin-spoke damping gear are designed;

[0017] Analysis comparison unit: acoustic harmonic response analysis is performed on the thin-spoke damping gear designed by the parameter design unit, and the far-field noise of the thin-spoke damping gear is compared with the gear without designing damping slots, if the damping effect does not meet the expectation, return to the parameter design unit, adjust the design parameters for iteration, until the far-field noise of the thin-spoke damping gear is lower than the set threshold value than the gear of the same size without damping design in the long-time working frequency band, so as to obtain the optimal design.

[0018] A computer storage medium, the storage medium has at least one instruction stored therein, the at least one instruction is loaded by a processor and runs the thin spoke damping gear design system.

[0019] A thin spoke damping gear design device, the device comprises a processor and a memory, the memory has at least one instruction stored therein, the at least one instruction is loaded by a processor and runs the thin spoke damping gear design system.

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

[0021] The present application uniformly sets damping slots on the thin spoke gear through wire cutting and the like, and the partial resonance pieces divided by the damping slots 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 partial resonance pieces and the noise radiated by the rest of the thin spoke body offset each other, thereby further reducing the vibration noise level of the thin spoke gear. Compared with the traditional gear damping and noise reduction method, the present method has simple processing technology, low cost and reliable structure, and can adapt to high temperature and high speed use environment in the field of aviation. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a front view of the thin spoke damping gear;

[0023] Figure 2 It is a view of the thin spoke damping gear in A-A direction;

[0024] Figure 3 It is a partial view of the damping slot of the thin spoke damping gear;

[0025] Figure 4 It is the far-field noise simulation result of the thin spoke damping gear of the preferred embodiment;

[0026] Figure 5 It is the comparison of the far-field noise simulation results of the thin spoke damping gear of the preferred embodiment and the thin spoke gear without damping;

[0027] Figure 6 It is a flowchart of the thin spoke damping gear design method. DETAILED DESCRIPTION DETAILED DESCRIPTION

[0029] The present embodiment is a thin spoke damping gear design method, which is described in combination with the drawings, including the following steps:

[0030] Step one, thin spoke gear modal analysis: collect the use conditions, materials and geometric parameters of the thin spoke gear, model using simulation software, and perform modal analysis to analyze the vibration mode and frequency of the thin spoke gear producing sound radiation;

[0031] Step two, thin spoke gear harmonic response analysis: on the basis of modal simulation, set the actual working condition of the speed and load, the structure of thin spoke gear harmonic response analysis, acoustic harmonic response analysis, confirm the thin spoke gear in the working frequency interval need to reduce the frequency range of vibration and noise;

[0032] Step three, design thin spoke gear structure: as shown in Figure 1 、 2 , 3, thin spoke gear includes thin spoke gear body 10, damping seam local 20, wherein the thin spoke gear body includes gear 11, the thickness of H thin spoke 12, installation hub 13, thin spoke 12 is uniformly provided with n damping seam local 20, n damping seam local 20 is uniformly distributed on the index circle with diameter D at φ° interval, damping seam local 20 includes damping seam 21, local resonant sheet 22;

[0033] Step four, according to the vibration mode and frequency of sound radiation determined in step one and step two, the frequency range of the thin spoke gear, the parameters of the thin spoke gear are designed, including the number n of damping seam local 20, the diameter D of the index circle on which n damping seam local 20 is uniformly distributed on the thin spoke 12, the width B and length L of the local resonant sheet 22, and the width b of the damping seam 21;The parameters of damping seam local 20 determine the local natural frequency and vibration mode of damping seam local 20, and the distribution rule n x φ° of damping seam local 20 on thin spoke 12 determines the coupling form of the local natural frequency and vibration mode of damping seam local 20 and the natural frequency and vibration mode of thin spoke gear body 10;

[0034] Step five, acoustic harmonic response analysis is carried out on the gear using the harmonic seam parameters in step four, and the damping effect is judged by simulation calculation.

[0035] Step six, compare the harmonic response analysis results in step four with the harmonic response analysis results in step two, compare the far-field noise of the thin spoke gear with the gear of the same size without damping seam design, if the damping effect does not meet the expectation, then re-implement the process of step four and step five to iterate the damping gear parameters, until the far-field noise of the thin spoke gear is lower than the set threshold than the gear of the same size without damping design in the long time working frequency band, so as to obtain the optimal design.

[0036] Among them, the use condition of the thin spoke gear in step one includes speed, load and torque. Specific implementation method two:

[0038] The embodiment is a kind of thin spoke gear design system, comprising:

[0039] Modal analysis unit: modal analysis is carried out using the use condition, material and geometric parameters of the thin spoke gear, to analyze the vibration mode and frequency of the thin spoke gear generating sound radiation;

[0040] harmonic response analysis unit: performing structural harmonic response analysis and acoustic harmonic response analysis on the thin-spoke gear, and confirming the frequency range of the thin-spoke gear that needs to be damped and noise-reduced in the working frequency interval;

[0041] parameter design unit: designing the parameters of the thin-spoke damping gear according to the acoustic radiation mode and frequency and the frequency range of the thin-spoke damping gear that needs to be damped and noise-reduced in the working frequency interval determined by the structural and modal analysis unit and the harmonic response analysis unit;

[0042] analysis and comparison unit: performing acoustic harmonic response analysis on the thin-spoke damping gear designed by the parameter design unit, comparing the far-field noise of the thin-spoke damping gear with that of the gear without damping slots, and if the damping effect does not meet the expectation, returning to the parameter design unit to adjust the design parameters for iteration until the far-field noise of the thin-spoke damping gear is lower than a set threshold than that of the gear without damping design in the same size and long-time working frequency band, thereby obtaining an optimal design.

[0043] The working conditions of the thin-spoke gear include rotational speed, load, and torque.

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

[0046] The present embodiment is a computer storage medium, which stores at least one instruction, and the at least one instruction is loaded and run by a processor to implement the thin-spoke damping gear design system.

[0047] It should be understood that the instructions include a computer program product, software or computerized method corresponding to any method described in the present application; the instructions can be used to program a computer system or other electronic device. The computer storage medium can include a readable medium having instructions stored thereon, including but not limited to magnetic storage media, optical storage media; magneto-optical storage media including read-only memory ROM, random access memory RAM, erasable programmable memory (such as EPROM and EEPROM) and flash memory layer, or other types of media suitable for storing electronic instructions. Specific implementation method four:

[0049] The present embodiment is a device, which includes a processor and a memory, and it should be understood that any device described in the present application includes a processor and a memory, and the device can also include other units, modules, etc. that display, interact, process, control, etc. through signals or instructions, and other functions;

[0050] The memory has at least one instruction stored therein, the at least one instruction is loaded by the processor and runs the thin-spoke vibration reduction gear design system.

[0051] Those skilled in the art should understand that the stored at least one instruction is a computer program product corresponding to the method or system. Therefore, the present application can adopt a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can adopt 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 solutions in the embodiments of the present application can be implemented in various computer languages, such as object-oriented programming language Java and interpreted scripting language JavaScript.

[0052] The present application is described with reference to flowcharts and / or block diagrams of the methods, systems and computer program products according to the embodiments of the present application, and can also be used for corresponding devices. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of the flows and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing devices to produce a machine, so that the instructions executed by the computer or other programmable data processing devices produce a device implemented in the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 an apparatus that performs the functions specified in the flowchart or flows and / or blocks.

[0053] These computer program instructions can also be stored in a computer readable memory capable of guiding the computer or other programmable data processing devices to work in a specific way, so that the instructions stored in the computer readable memory produce a manufactured product including instruction apparatus, which implements the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 an apparatus that performs the functions specified in the flowchart or flows and / or blocks.

[0054] These computer program instructions can also be loaded into a computer or other programmable data processing device, so that a series of operation steps are performed on the computer or other programmable device to produce a computer implemented process, so that the instructions executed on the computer or other programmable device provide a process for implementing the flowcharts and / or block diagrams. Figure 1 one or more flows and / or blocks Figure 1 an apparatus that performs the functions specified in the flowchart or flows and / or blocks.

[0055] While the preferred embodiments of the application have been described, additional variations and modifications can be made to the embodiments by those skilled in the art once they learn of the basic inventive concepts disclosed with this specification. Accordingly, the appended claims are intended to cover all such modifications and variations as fall within the true spirit and scope of the application.

[0056] It is apparent that many modifications and variations of this application can be effected although only a few have been chosen for purposes of illustrative clarity. Thus, it is intended that only the preferred embodiments of the application be limited by the scope of the appended claims and their equivalents.

[0057] The above examples of the application only serve to illustrate the design idea and process of the application, and are not intended to limit the embodiments of the application. Based on the above description, other different forms of changes or variations can be made by those skilled in the art, and it is impossible to enumerate all the embodiments here. Any obvious changes or variations derived from the technical solutions of the application still fall within the protection scope of the application.

[0058] Embodiment:

[0059] The embodiment is a preferred scheme of a thin-spoke damping gear design method, which is described in combination with the drawings.

[0060] The size of the thin-spoke gear is 69mm in diameter, 6mm in tooth width, 15mm in diameter at the hub, and 2mm in thickness H of the thin-spoke.

[0061] First, modal analysis is performed to analyze the vibration mode and frequency of the thin-spoke gear generating sound radiation, and on this basis, the actual working speed and load are set to perform structural harmonic response analysis and acoustic harmonic response analysis on the thin-spoke gear, and to confirm the frequency range of the thin-spoke gear that needs to be damped and noise-reduced in the working frequency interval. It is found through simulation calculation of the example that the air radiation noise is large in the long-time working frequency range of 1500-4800Hz in the working frequency band of 0-4800Hz, and the human ear is sensitive to the noise in the frequency band of 1000-3000Hz, so it is confirmed that the long-time working frequency range of 1500-4800Hz is designed for damping.

[0062] Then, the thin-spoke damping gear structure is designed as follows: Figure 4 , 2As shown in FIGS. 1, 2 and 3, the thin-spoke gear includes a thin-spoke gear body 10 and a damping slot part 20, five damping slot parts 20 are uniformly arranged on the thin-spoke 12, and the five damping slot parts 20 are uniformly distributed on a reference circle with a diameter D of 37.5 mm. The damping slot part 20 includes a damping slot 21 and a partial resonant piece 22. The width b of the damping slot 21 is 0.5 mm, the length L of the partial resonant piece 22 is 4 mm, and the width B of the partial resonant piece 22 is 2 mm.

[0063] The thin-spoke damping gear is subjected to acoustic harmonic response analysis, as shown in FIG. 4, it can be seen that the thin-spoke gear indeed has a problem of acoustic radiation noise under the meshing frequency and high-frequency vibration excitation of the structural acoustic coupling effect, and the thin-spoke is the main noise emission source. The harmonic response analysis result is compared with the harmonic response analysis result of a gear without damping design of the same size, and the far-field noise of the two gears is compared, as shown in FIG. 5. In the analysis bandwidth of 0-4800 Hz, specifically in the interval of 1100-4800 Hz, the far-field noise of the preferred embodiment is 2dBA lower than that of the thin-spoke gear without damping design of the same size on average. Figure 5 ​ The thin-spoke damping gear is subjected to acoustic harmonic response analysis, as shown in FIG. 4, it can be seen that the thin-spoke gear indeed has a problem of acoustic radiation noise under the meshing frequency and high-frequency vibration excitation of the structural acoustic coupling effect, and the thin-spoke is the main noise emission source. The harmonic response analysis result is compared with the harmonic response analysis result of a gear without damping design of the same size, and the far-field noise of the two gears is compared, as shown in FIG. 5. In the analysis bandwidth of 0-4800 Hz, specifically in the interval of 1100-4800 Hz, the far-field noise of the preferred embodiment is 2dBA lower than that of the thin-spoke gear without damping design of the same size on average.​

Claims

1. A method for designing a thin-spoke vibration-damping gear, characterized in that, The method includes the following steps: Step 1: Modal analysis of thin-spoked gears: Modal analysis is performed using the operating conditions, materials, and geometric parameters of the thin-spoked gears to analyze the vibration modes and frequencies of the sound radiation generated by the thin-spoked 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 identify the frequency range in which vibration reduction and noise reduction are required for thin-spoke gears within the operating frequency range. Step 3: Design the thin-spoked gear structure: The thin-spoked gear includes a thin-spoked gear body (10) and a damping slot section (20). The thin-spoked gear body includes a gear (11), thin spokes (12), and a mounting hub (13). n damping slot sections (20) are evenly arranged on the thin spokes (12). The damping slot section (20) includes a damping slot (21) and a local resonator (22). The vibration damping joint (21) is S-shaped; Step 4: Based on the sound radiation mode shape and frequency determined in Step 1 and Step 2, and the frequency range within the operating frequency range where vibration reduction and noise reduction are required, design the parameters of the thin-spoke vibration damping gear. The parameters of the thin-spoke damping gear include: the number n of damping slots (20), the pitch circle diameter D of the n damping slots (20) evenly distributed on the thin spokes (12), the width B and length L of the local resonator (22), and the width b of the damping slot (21). Step 5: Perform acoustic harmonic response analysis on the thin-spoked vibration-damping gear using the parameters described in Step 4; Step Six: Compare the harmonic response analysis results described in Step Four with those described in Step Two. Compare the far-field noise of the thin-spoke damping gear with that of a gear of the same size without damping slots. If the damping effect does not meet expectations, repeat Step Four and Step Five to iterate the damping gear parameters until the far-field noise of the thin-spoke damping gear is lower than the set threshold in the long-term operating frequency band compared to a gear of the same size without damping design, thus obtaining the optimal design.

2. The design method for a thin-spoke vibration-damping gear according to claim 1, characterized in that, The operating conditions of the thin-spoked gear described in step one include speed, load, and torque.

3. A thin-spoke vibration-damping gear design system, characterized in that, include: Modal analysis unit: Utilizes the operating conditions, materials, and geometric parameters of the thin-spoked gear to perform modal analysis, analyzing the vibration modes and frequencies of the sound radiation generated by the thin-spoked gear; Harmonic response analysis unit: Performs structural harmonic response analysis and acoustic harmonic response analysis on thin-spoke gears to identify the frequency range in which vibration reduction and noise reduction are required for thin-spoke gears within the operating frequency range. Parameter design unit: Based on the sound radiation mode shape and frequency determined by the structure and modal analysis unit and harmonic response analysis unit of the thin-spoke vibration damping gear, and the frequency range within the operating frequency range that requires vibration reduction and noise reduction, the parameters of the thin-spoke vibration damping gear are designed. The parameters of the thin-spoke damping gear include: the number n of damping slots (20), the pitch circle diameter D of the n damping slots (20) evenly distributed on the thin spokes (12), the width B and length L of the local resonator (22), and the width b of the damping slot (21). The vibration damping joint (21) is S-shaped; 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-field noise of the thin-spoke vibration-damping gear with that of the gear without vibration-damping design. If the vibration reduction effect does not meet expectations, return to the parameter design unit, adjust the design parameters and iterate until the far-field noise of the thin-spoke vibration-damping gear is lower than the set threshold in the long-term working frequency band compared with the gear of the same size without vibration-damping design, thus obtaining the optimal design.

4. The thin-spoke vibration-damping gear design system according to claim 3, characterized in that, The operating conditions of the thin-spoked gear include speed, load, and torque.

5. A computer storage medium, characterized in that, The storage medium stores at least one instruction, which is loaded and executed by a processor as described in any one of claims 3 to 4, for a thin-spoke vibration-damping gear design system.

6. A device for designing thin-spoke vibration-damping gears, characterized in that, The device includes a processor and a memory, the memory storing at least one instruction, which is loaded and executed by the processor as described in any one of claims 3 to 4.

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