A Modeling Method for a Single-Layer Vibration-Isolation Gear Transmission System Based on ADAMS

Abstract

The present invention belongs to a modeling method. To solve the technical problems that currently, when modeling for analyzing the vibration and noise of a gear system housing, the modeling is complex and time-consuming, a modeling method for a single-layer vibration isolation gear transmission system based on ADAMS is provided. For the single-layer vibration isolation gear transmission system, the single-layer vibration isolation gear transmission system is divided into gears, shafts, bearings, gearboxes, vibration isolators, and bases. The gears are established using the gear system module of the ADAMS Machinery module, the shafts are established using the ADAMS solid module, the gearbox has a complex structure and is established in SolidWorks, and the output is in a format recognizable by ADAMS. The gearbox model is imported into ADAMS. The base has a complex structure and is established in SolidWorks, and the output is in a format recognizable by ADAMS. The gearbox model is imported into ADAMS. The bearings are established using the bearing module of the ADAMS Machinery module and are used to connect the gear shafts and the gearbox. The vibration isolators are established using the spring damper of the force module and are placed between the gearbox and the base to play a role in vibration isolation.

Description

Technical Field

[0001] The present invention belongs to a modeling method, and particularly relates to a modeling method for a single-layer vibration isolation gear transmission system based on ADAMS. Background Art

[0002] Adding a vibration isolation device is one of the important and effective methods to reduce mechanical vibration and noise. The vibration isolation device can isolate the vibration transmitted from vibration sources such as engines and gearboxes to the base. At present, the dynamic model of the gear system is mainly a gear-rotor coupling model, and the modeling method is mainly the lumped mass method. When analyzing the vibration and noise of the box body, the conventional method is to establish a finite element model of the box body and include the bearing excitation force of the uncoupled transmission system model, without considering the mutual influence between the gear pair, shaft, bearing, base, and gearbox.

[0003] To solve the above problems, some scholars have established a coupled dynamic model of the gear transmission system and the gearbox. The methods used include the lumped mass method, finite element method, multi-body dynamics method, modal synthesis method, dynamic stiffness synthesis method, and statistical energy method. Modeling by the above methods usually requires extensive professional knowledge and sufficient programming and computing capabilities. The modeling is complex and time-consuming. Summary of the Invention

[0004] The present invention provides a modeling method for a single-layer vibration isolation gear transmission system based on ADAMS to solve the technical problems of complex modeling and time-consuming during modeling when analyzing the vibration and noise of the gear system box body.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A modeling method for a single-layer vibration isolation gear transmission system based on ADAMS, characterized by including the following steps:

[0007] S1, dividing the single-layer vibration isolation gear transmission system into gears, gear shafts, bearings, gearboxes, vibration isolators, and bases;

[0008] S2, establishing a gear model through the gear system module of the ADAMS Machinery module;

[0009] S3, establishing a gear shaft model through the ADAMS solid module;

[0010] S4, establishing a gearbox structure model in SolidWorks, outputting a format recognizable by ADAMS, and importing it into ADAMS to obtain a gearbox model;

[0011] S5, establishing a base structure model in SolidWorks, outputting it in a format recognizable by ADAMS, and importing it into ADAMS to obtain a base model;

[0012] Step 6: Establish a bearing model through the bearing module of the ADAMS Machinery module, and connect the gear shaft model and the gearbox model through the bearing model;

[0013] Step 7: Establish a vibration isolator model through the spring damper of the ADAMS Machinery force module, and place the vibration isolator model between the gearbox model and the base model;

[0014] Step 8: Connect the gear model and the gear shaft model, the gearbox model and the vibration isolator model, and the vibration isolator model and the base model respectively, and then assemble them to obtain a single-layer vibration isolation gear transmission system model.

[0015] Furthermore, step S2 is specifically as follows:

[0016] S2.1: Create a design point in ADAMS as the center position of the gear;

[0017] S2.2: Establish a gear pair through the gear module in ADAMS, and determine the gear type model according to the gear type;

[0018] S2.3: Determine the gear pair parameters, use the gear parameters as the input of the gear system module of the ADAMS Machinery module, and combine the gear pair and the gear type model to establish a gear model.

[0019] Furthermore, in step S2.3, the gear pair parameters include modulus, pressure angle, axis of rotation, center position of the driving wheel in the gear pair, center position of the driven wheel in the gear pair, rotation direction, number of teeth, tooth width, profile, addendum coefficient, modification coefficient, modification condition, contact stiffness, contact damping, static friction coefficient, and dynamic friction coefficient.

[0020] Furthermore, step S3 is specifically as follows:

[0021] S3.1: Take the center position of the gear as the reference point to determine the position of the gear in the single-layer vibration isolation gear transmission system;

[0022] S3.2: Determine the position of the bearing in the single-layer vibration isolation gear transmission system;

[0023] S3.3: Divide the gear shaft into multiple cylindrical gear shaft segments according to the cross-sectional dimension of the gear shaft, the position of the gear in the single-layer vibration isolation gear transmission system, the position of the bearing in the single-layer vibration isolation gear transmission system, the power input point position of the gear shaft, and the power output point position of the gear shaft;

[0024] S3.4: Determine the material and mass of each gear shaft segment;

[0025] S3.5, Determine the positions of each gear shaft section in the single-layer vibration isolation gear transmission system;

[0026] S3.6, Based on the positions of the gears determined in step S3.1 in the single-layer vibration isolation gear transmission system, determine the positions of the two sides of the gear pair as the reference planes on both sides of the gear pair;

[0027] S3.7, According to any one of the reference planes on both sides of the gear pair and the positions of each gear shaft section in the single-layer vibration isolation gear transmission system, combined with the results of steps S3.3 to S3.5, establish a model of the gear shaft section adjacent to the reference plane through the ADAMS solid module;

[0028] S3.8, Starting from the reference plane and moving away from it, sequentially establish models of each gear shaft section through the ADAMS solid module to complete the establishment of the gear shaft model.

[0029] Furthermore, step S4 is specifically as follows:

[0030] S4.1, In SolidWorks, ignoring bolts and coolant pipelines, establish a gearbox structure model according to the inner hole center positions of the bearings;

[0031] S4.2, Unify the coordinate systems of the gearbox structure model in SolidWorks and the ADAMS coordinate system, and determine the position of the gearbox structure model in ADAMS;

[0032] S4.3, Output the gearbox structure model in the.x_t format and import it into ADAMS to obtain the gearbox model.

[0033] Furthermore, step S5 is specifically as follows:

[0034] S5.1, In SolidWorks, ignoring bolts, establish a base structure model according to the center positions of the vibration isolators;

[0035] S5.2, Unify the coordinate systems of the base structure model in SolidWorks and the ADAMS coordinate system, and determine the position of the base structure model in ADAMS;

[0036] S5.3, Output the base structure model in the.x_t format and import it into ADAMS to obtain the base model.

[0037] Furthermore, step S6 is specifically as follows:

[0038] S6.1, Calculate the bearing stiffness based on speed and position;

[0039] S6.2, Determine the bearing center position and the rotation axis according to the bearing type and bearing position;

[0040] S6.3. Determine the inner diameter size of the bearing and the size of the rotating shaft.

[0041] S6.4. Determine the installation position of the bearing in the bearing housing of the gearbox in the gearbox model and the installation position of the inner hole of the bearing in the gear shaft model.

[0042] S6.5. According to the results obtained in steps S6.1 to S6.4, establish a bearing model connecting the gear shaft model and the gearbox model through the bearing module of the ADAMS Machinery module.

[0043] Further, step S7 is specifically as follows:

[0044] S7.1. Determine the stiffness and damping of the vibration isolator.

[0045] S7.2. Determine the position of the vibration isolator.

[0046] S7.3. According to the results of steps S7.1 and S7.2, establish a vibration isolator model through the spring damper of the ADAMS Machinery force module, and place the vibration isolator model between the gearbox model and the base model.

[0047] Compared with the prior art, the present invention has the following beneficial effects:

[0048] 1. The present invention provides a modeling method for a single-layer vibration isolation gear transmission system based on ADAMS. For a single-layer vibration isolation gear transmission system, the single-layer vibration isolation gear transmission system is divided into gears, shafts, bearings, gearboxes, vibration isolators, and bases. The gears are established using the gear system module of the ADAMS Machinery module, the shafts are established using the ADAMS solid module, the gearbox has a complex structure and is established in SolidWorks, and the output is in a format recognizable by ADAMS. The gearbox model is imported into ADAMS. The base has a complex structure and is established in SolidWorks, and the output is in a format recognizable by ADAMS. The gearbox model is imported into ADAMS. The bearings are established using the bearing module of the ADAMS Machinery module to connect the gear shaft and the gearbox. The vibration isolators are established using the spring damper of the force module and are placed between the gearbox and the base to play a role in vibration isolation. The method of the present invention can relatively conveniently establish a complex model of a single-layer vibration isolation gear transmission system, greatly simplifies the complexity of the modeling process, and effectively shortens the modeling time.

[0049] 2. When modeling the gear shaft in the present invention, the gear shaft is divided into multiple gear shaft segments, and the positions of the two sides of the gear pair are used as reference planes to establish the gear shaft segment models one by one, with high accuracy and more convenient modeling.

[0050] 3. In the process of modeling each component of the present invention, the physical parameters of each component are fully considered, effectively improving the practicability of the modeling results. Brief Description of the Drawings

[0051] Figure 1 It is a schematic diagram of the principle of an embodiment of a modeling method for a single-layer vibration isolation gear transmission system based on ADAMS of the present invention. Detailed Embodiment

[0052] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. Generally, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0053] In view of the problem of the relatively large modeling difficulty of the existing single-layer vibration isolation gear transmission system, the present invention proposes a more efficient and accurate modeling method. The single-layer vibration isolation gear transmission system is divided into a gear, a gear shaft, a bearing, a gearbox, a vibration isolator, and a base. Models are established separately and then connected to form a complete model. The specific steps are as follows:

[0054] Step 1: Establish a gear model using the gear system module of the ADAMS Machinery module.

[0055] 1) Create design points in ADAMS to define the center position of the gear;

[0056] 2) Establish a gear pair using the gear module in ADAMS, and select the gear type. In this embodiment, the gear type is selected as a helical gear, and a 3D contact model is adopted;

[0057] 3) Define the modulus, pressure angle, axis of rotation of the gear, as well as the center position, rotation direction, number of teeth, tooth width, profile, addendum coefficient, modification coefficient, etc. of the driving and driven wheels. Tooth modification can also be considered;

[0058] 4) Define the contact stiffness and damping of the gear, the static friction coefficient and the dynamic friction coefficient;

[0059] 5) Determine the position of the gear. Taking the gear center as the reference point, determine the position of the gear in the entire system for subsequent assembly;

[0060] Based on the above 1) to 5), establish a gear model in the gear system module of the ADAMS Machinery module.

[0061] Step 2: Establish a gear shaft model using the ADAMS solid module.

[0062] The gear shaft is divided into a series of gear shaft segments according to the cross-sectional dimensions, the positions of the gears, bearings, and power input / output points. Each gear shaft segment adopts a cylindrical structure. Determine the parameters such as the material and mass properties of the gear shaft segment. In order to better connect with the gear pair, taking the position of the gear pair as the reference, a gear shaft segment model is established. In actual engineering, usually the gear shaft and the gear pair are connected by a key. When modeling using the method of the present invention, the influence of the key is ignored, and it is considered that the gear shaft and the gear are integrated. The specific steps are as follows;

[0063] 1) The gear shaft is divided into a series of gear shaft segments according to the cross-sectional dimensions, the positions of the gears, bearings, and power input / output points. Each gear shaft segment adopts a cylindrical structure;

[0064] 2) Taking the two side faces of the gear pair as the reference planes, establish the first gear shaft segment adjacent to the side faces of the gear pair;

[0065] 3) Taking one end of the gear shaft segment away from the gear pair as the reference plane, establish the model of the second gear shaft segment adjacent to the first gear shaft segment, and complete the model establishment of each gear shaft segment one by one to obtain the modeling of the entire gear shaft.

[0066] Step 3, the structure of the gearbox is relatively complex, so it is established in SolidWorks and then output in a format recognizable by ADAMS. Import the gearbox model into ADAMS. In addition to SolidWorks, other 3D software such as Proe and UG can also be used. The specific method is as follows:

[0067] 1) Establish the structural model of the gearbox in the 3D software SolidWorks. When modeling, consider the main structure and ignore the structures such as bolts and coolant pipelines;

[0068] 2) When modeling, it is necessary to clearly define the center positions of the bearing holes to facilitate the establishment of bearings at the corresponding positions after importing into ADAMS;

[0069] 3) Unify the coordinate systems of the 3D structural model of the gearbox and ADAMS, and determine the position of the gearbox;

[0070] 4) Define the material properties of the gearbox;

[0071] 5) Output the structural model of the gearbox in the.x_t format recognizable by ADAMS;

[0072] 6) Import the structural model of the gearbox in the.x_t format into ADAMS.

[0073] Step 4, the structure of the base is relatively complex. It is established in SolidWorks, output in a format recognizable by ADAMS, and the base structure model is imported into ADAMS.

[0074] 1) Establish the structural model of the base in the 3D software SolidWorks. When modeling, consider the main structure and ignore structures such as bolts.

[0075] 2) When modeling, it is necessary to clearly define the central position for installing the vibration isolator, which is convenient for establishing the vibration isolator at the corresponding position after importing into ADAMS.

[0076] 3) Unify the coordinate systems of the 3D structural model of the base and ADAMS, and determine the position of the base.

[0077] 4) Define the material properties of the base.

[0078] 5) Output the structural model of the base in the.x_t format recognizable by ADAMS.

[0079] 6) Import the structural model of the base in the.x_t format into ADAMS.

[0080] Step 5: Use the bearing module in the ADAMS Machinery module to establish a bearing model, and connect the gear shaft model and the gearbox model through the bearing model. The bearing is used to support the gear shaft and realize the connection between the gear shaft and the gearbox:

[0081] 1) Select the "detailed" bearing type in ADAMS. This type of bearing can calculate the corresponding bearing stiffness according to speed and position, or simulation results can also be used.

[0082] 2) Determine the bearing type. In the modeling of this embodiment, the most common deep groove ball bearing is selected as the bearing type.

[0083] 3) Determine the bearing position and the axis of rotation.

[0084] 4) Determine the basic dimension parameters such as the inner diameter of the bearing and the parameters of the axis of rotation.

[0085] 5) Determine the installation positions of the bearing and the bearing housing of the gearbox, and the inner hole of the bearing of the gear shaft.

[0086] 6) After defining the above parameters, generate a bearing model connecting the gear shaft model and the gearbox model through the mechanical system transmission module of ADAMS.

[0087] Step 6: The vibration isolator is established using the spring damper in the force module and placed between the gearbox model and the base model to connect the gearbox and the base, reduce the vibration transmission between the gearbox and the base, and play a role in vibration isolation.

[0088] 1) Define the stiffness and damping of the vibration isolator.

[0089] 2) Determine the positions of the vibration isolators. The vibration isolators are placed between the gearbox and the base, with the upper end supporting the gearbox and the lower end connected to the base. A spring-damping model is established at the positions of the vibration isolators between the gearbox and the base, and a vibration isolator model is established.

[0090] Step 7: Finally, connect the gear model, the gear shaft model, the bearing model, the gearbox model, the vibration isolator model, and the base model to form a complete model of the single-layer vibration isolation gear transmission system.

[0091] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A modeling method for a single-layer vibration isolation gear transmission system based on ADAMS, characterized in that It includes the following steps: S1. Divide the single-layer vibration isolation gear transmission system into gears, gear shafts, bearings, gearboxes, vibration isolators, and bases; S2. Establish a gear model through the gear system module of the ADAMS Machinery module; S3. Establish a gear shaft model through the ADAMS solid module. Specifically: S3.

1. Take the center position of the gear as the reference point to determine the position of the gear in the single-layer vibration isolation gear transmission system; S3.

2. Determine the position of the bearings in the single-layer vibration isolation gear transmission system; S3.

3. Divide the gear shaft into multiple cylindrical gear shaft segments according to the cross-sectional dimensions of the gear shaft, the position of the gear in the single-layer vibration isolation gear transmission system, the position of the bearings in the single-layer vibration isolation gear transmission system, the power input point position of the gear shaft, and the power output point position of the gear shaft; S3.

4. Determine the material and mass of each gear shaft segment; S3.

5. Determine the position of each gear shaft segment in the single-layer vibration isolation gear transmission system; S3.

6. According to the position of the gear in the single-layer vibration isolation gear transmission system determined in step S3.1, determine the positions of the two sides of the gear pair as the reference planes on both sides of the gear pair; S3.

7. Based on any one of the reference planes on both sides of the gear pair and the position of each gear shaft segment in the single-layer vibration isolation gear transmission system, and combining the results of steps S3.3 to S3.5, establish a gear shaft segment model adjacent to the reference plane through the ADAMS solid module; S3.

8. Starting from the reference plane close to the gear pair and moving away from the reference plane, establish the models of each gear shaft segment in sequence through the ADAMS solid module to complete the establishment of the gear shaft model; S4. Establish a gearbox structure model in SolidWorks, output it in a format recognizable by ADAMS, and import it into ADAMS to obtain a gearbox model; S5. Establish a base structure model in SolidWorks, output it in a format recognizable by ADAMS, and import it into ADAMS to obtain a base model; S6. Establish a bearing model through the bearing module of the ADAMS Machinery module, and connect the gear shaft model and the gearbox model through the bearing model; S7. Establish a vibration isolator model through the spring damper of the ADAMS Machinery force module, and place the vibration isolator model between the gearbox model and the base model; S8. Connect the gear model and the gear shaft model, the gearbox model and the vibration isolator model, and the vibration isolator model and the base model respectively, and then assemble them to obtain a single-layer vibration isolation gear transmission system model.

2. The modeling method of a single-layer vibration isolation gear transmission system based on ADAMS according to claim 1, characterized in that, Step S2 is specifically: S2.

1. Create a design point in ADAMS as the center position of the gear; S2.

2. Establish a gear pair through the gear module in ADAMS, and determine the gear type model according to the gear type; S2.

3. Determine the gear pair parameters, use the gear pair parameters as the input of the gear system module of the ADAMS Machinery module, and combine the gear pair and the gear type model to establish a gear model.

3. A modeling method for a single-layer vibration isolation gear transmission system based on ADAMS according to claim 2, characterized in that: In step S2.3, the parameters of the gear pair include modulus, pressure angle, axis of rotation, center position of the driving wheel in the gear pair, center position of the driven wheel in the gear pair, direction of rotation, number of teeth, tooth width, profile, addendum coefficient, modification coefficient, modification condition, contact stiffness, contact damping, static friction coefficient, and dynamic friction coefficient.

4. The modeling method of a single-layer vibration isolation gear transmission system based on ADAMS according to claim 3, characterized in that, Step S4 is specifically as follows: S4.

1. In SolidWorks, ignoring the bolts and coolant pipelines, a gearbox structure model is established according to the center position of the inner hole of the bearing. S4.

2. Unify the coordinate systems of the gearbox structure model in SolidWorks and the ADAMS coordinate system, and determine the position of the gearbox structure model in ADAMS. S4.

3. Output the gearbox structure model in the.x_t format and import it into ADAMS to obtain the gearbox model.

5. A modeling method for a single-layer vibration isolation gear transmission system based on ADAMS according to claim 4, characterized in that Step S5 is specifically as follows: S5.

1. In SolidWorks, ignoring the bolts, a base structure model is established according to the center position of the vibration isolator installation. S5.

2. Unify the coordinate systems of the base structure model in SolidWorks and the ADAMS coordinate system, and determine the position of the base structure model in ADAMS. S5.

3. Output the base structure model in the.x_t format and import it into ADAMS to obtain the base model.

6. A modeling method for a single-layer vibration isolation gear transmission system based on ADAMS according to claim 5, characterized in that Step S6 is specifically as follows: S6.

1. Calculate the bearing stiffness based on the speed and position. S6.

2. Determine the center position and axis of rotation of the bearing according to the bearing type and bearing position. S6.

3. Determine the inner diameter size and axis size of the bearing. S6.

4. Determine the installation position of the bearing on the bearing housing of the gearbox in the gearbox model and the installation position of the inner hole of the bearing on the gear shaft in the gear shaft model. S6.

5. Based on the results obtained from steps S6.1 to S6.4, establish a bearing model connecting the gear shaft model and the gearbox model through the bearing module of the ADAMS Machinery module.

7. A modeling method for a single-layer vibration isolation gear transmission system based on ADAMS according to claim 6, characterized in that, Step S7 is specifically as follows: S7.

1. Determine the stiffness and damping of the vibration isolator. S7.

2. Determine the position of the vibration isolator. S7.

3. Based on the results of steps S7.1 and S7.2, establish a vibration isolator model through the spring damper of the ADAMS Machinery force module and place the vibration isolator model between the gearbox model and the base model.

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