Damping identification method and system for scissors suspension seat

Abstract

The application relates to the technical field of seat dynamic characteristic research, and provides a damping identification method and system of a scissors suspension seat, which comprises the following steps: obtaining a simplified model of a scissors suspension structure; performing stress analysis on the simplified model of the scissors suspension structure to obtain an equivalent damping calculation expression of a scissors suspension seat vibration system; obtaining an equivalent damping calculation expression of a general vibration system; and obtaining an equivalent damping calculation expression of the scissors suspension seat according to the equivalent damping calculation expression of the scissors suspension seat vibration system and the equivalent damping calculation expression of the general vibration system. The application can improve the precision of a seat simulation model and reduce the result error of dynamic simulation calculation by simplifying the model of the scissors suspension seat, performing stress analysis on the simplified model of the scissors suspension structure, and completely deducing the damping calculation expression of the scissors suspension seat structure; the application can provide a guidance scheme for the suspension design of an air suspension seat and improve the dynamic performance of a seat product.

Description

Technical Field

[0001] This application relates to the technical field of dynamic characteristics research of scissor suspension seat vibration systems, specifically to a damping identification method and system for scissor suspension seats. Background Technology

[0002] Studies have shown that professional drivers are exposed to continuous, long-term vibrations from road surface excitation during their daily work. This not only reduces work efficiency but also harms their health, leading to various occupational diseases such as lumbar pain. Scissor suspension seats are widely used in commercial vehicles and other vehicles. Their vibration isolation effect helps reduce the vibration experienced by the driver, improves the driver's working environment, and enhances vehicle ride comfort.

[0003] Most modern car seat suspensions are scissor suspension seats. A typical scissor suspension seat vibration system consists of a guide support mechanism, air springs, dampers, sliders, and a seat cushion. However, due to the complex dynamic characteristics of the scissor guide support mechanism, most seat optimization designs do not consider the specific scissor suspension structure. Instead, they directly use the spring and damping parameters or equivalent stiffness obtained from testing to establish a dynamic or mathematical model, without theoretically deriving complete expressions for the stiffness and damping calculations of the scissor suspension seat structure. This results in significant discrepancies between the theoretical and practical models, making seat optimization design extremely difficult. Summary of the Invention

[0004] This application provides a damping identification method and system for scissor suspension seats, which can solve the technical problem that the complex dynamic characteristics of scissor guide support mechanisms in the prior art, most seat optimization designs do not consider the specific scissor suspension structure of the seat, and do not derive the damping calculation expression of the scissor suspension seat structure in a complete theoretical manner, resulting in a large error between the theoretical model and the actual model, which leads to a great deal of difficulty in the optimization design of the seat.

[0005] In a first aspect, this application provides a damping identification method for a scissor suspension seat, comprising the following steps:

[0006] The scissor suspension structure of the seat is simplified to obtain a simplified model of the scissor suspension structure;

[0007] Force analysis was performed on a simplified model of the scissor suspension structure to obtain the equivalent damping calculation expression for the scissor suspension seat vibration system;

[0008] Obtain the equivalent damping calculation expression for a general vibration system;

[0009] Based on the equivalent damping calculation expression of the scissor suspension seat vibration system and the equivalent damping calculation expression of the general vibration system, the equivalent damping calculation expression of the scissor suspension seat is obtained.

[0010] In conjunction with the second aspect, in one implementation, the step of performing force analysis on the simplified model of the scissor suspension structure to obtain the equivalent damping calculation expression for the scissor suspension seat vibration system specifically includes the following steps:

[0011] Establish the overall force balance equation for the seat;

[0012] Obtain the calculation expressions for air spring force, damper damping force, and friction force;

[0013] Obtain the force balance equations for the two scissor arms of the seat scissor suspension;

[0014] By combining the overall force balance equation of the seat with the calculation expressions for the air spring force, damper damping force and friction force, as well as the force balance equation of the two scissor arms of the seat scissor suspension, the general form of the vibration differential equation of the scissor suspension seat vibration system under simple harmonic excitation is obtained.

[0015] By comparing the coefficients of the obtained general form of the vibration differential equation, the expression for calculating the damping ratio is obtained;

[0016] By combining the expressions for calculating the damping ratio and the damping coefficient, the equivalent damping calculation expression for the scissor suspension seat vibration system is obtained.

[0017] In conjunction with the second aspect, in one embodiment, the overall force balance equation of the seat is as follows:

[0018]

[0019] In the formula, This is the force balance equation for the vibrating system in the X direction; Here is the force balance equation for the vibrating system in the Y direction; The simplified model of the scissor suspension structure provides the overall moment balance equations. The force acting at point C is in the X direction. The force acting at point B is in the X direction. The damping force of the damper; The force acting in the Y direction at point C; The force acting at point B is in the Y direction. This refers to the overall weight of the suspension.

[0020] In conjunction with the second aspect, in one embodiment, obtaining the force balance equations of the two scissor arms of the seat scissor suspension specifically includes:

[0021] Force analysis of the first shear bar yields the following force equilibrium equation:

[0022]

[0023] In the formula, The force balance equations are given in the X direction; The force equilibrium equations are given in the Y direction; The force balance equation at the center point of the AB rod in the simplified model of the scissor suspension structure; The force acting at point O in the X direction; The force acting at point A in the X direction; The force acting at point B in the X direction; The force acting at point B in the Y direction; The force acting at point O in the X direction; The force acting at point A in the Y direction; This is the first length variable of the vibration system; This is the second length variable of the vibration system;

[0024] Force analysis of the second shear bar yields the following force equilibrium equations:

[0025]

[0026] In the formula, The force balance equations are given in the X direction; The force equilibrium equations are as follows: The simplified model of the scissor suspension structure provides the force balance equations at the center point of the CD rod. The force acting at point C in the X direction is... The force acting at point O in the X direction is... The force acting on point D in the X direction is... The force acting at point C in the Y direction is... The force acting at point D in the Y direction is... The force acting at point O in the Y direction is... The force is the air spring force.

[0027] In conjunction with the second aspect, in one embodiment, the damping ratio calculation expression is as follows:

[0028]

[0029] In the formula, The damping ratio; The initial angular velocity, For the overall weight of the suspension; The angle between the first scissor bar and the seat base; The angle between the second scissor bar and the seat base; This is the first length variable of the vibration system; This is the second length variable of the vibration system; This is the equivalent damping of a general vibration system; μ is the coefficient of friction.

[0030] In conjunction with the second aspect, in one embodiment, the simultaneous expression for calculating the damping ratio and the expression for calculating the damping coefficient yields the equivalent damping calculation expression for the scissor suspension seat vibration system, as shown in the following equation:

[0031]

[0032] In the formula, The equivalent damping of the scissor suspension seat vibration system; This is the equivalent damping of a general vibration system; The angle between the first scissor bar and the seat base; The angle between the second scissor bar and the seat base; This is the first length variable of the vibration system; This is the second length variable of the vibration system; μ is the coefficient of friction.

[0033] In conjunction with the second aspect, in one embodiment, obtaining the equivalent damping calculation expression for a general vibration system specifically includes the following steps:

[0034] Obtain the differential equation of motion for a mass-spring system with dry friction damping under a single degree of freedom;

[0035] Give the initial displacement excitation and steady-state displacement response of the mass-spring system;

[0036] Derive the calculation expressions for the negative work done by the damping force and the work done by the friction force in one cycle of the scissor suspension seat when there is dry friction damping force in the seat;

[0037] By combining the expressions for the negative work done by the damping force and the work done by the frictional force, and applying the equivalent viscous damping rule, we can obtain the expression for the equivalent damping of a general vibration system.

[0038] In conjunction with the second aspect, in one embodiment, the equivalent damping calculation expression is as follows:

[0039]

[0040] In the formula, This is the equivalent damping of a general vibration system; Friction; This represents the current amplitude of the vibration system. Angular velocity, This represents the current amplitude.

[0041] Secondly, this application provides a system for identifying the friction damping of a scissor suspension seat, comprising:

[0042] The simplified model acquisition module is used to simplify the scissor suspension structure of the seat and obtain a simplified model of the scissor suspension structure.

[0043] The scissor suspension system equivalent damping calculation module is communicatively connected to the simplified model acquisition module to perform force analysis on the simplified model of the scissor suspension structure and obtain the equivalent damping calculation expression of the scissor suspension seat vibration system.

[0044] The equivalent damping calculation module for general vibration systems is used to obtain the equivalent damping calculation expression for general vibration systems.

[0045] The scissor suspension seat equivalent damping calculation module is communicatively connected to the scissor suspension system equivalent damping calculation module and the general vibration system equivalent damping calculation module. It is used to obtain the equivalent damping calculation expression of the scissor suspension seat based on the equivalent damping calculation expression of the scissor suspension seat vibration system and the equivalent damping calculation expression of the general vibration system.

[0046] In conjunction with the second aspect, in one embodiment, the scissor suspension system equivalent damping calculation module includes:

[0047] The overall force analysis unit is used to establish the overall force equilibrium equation of the seat;

[0048] The vibration-related force acquisition unit is used to obtain the calculation expressions for air spring force, damper damping force, and friction force.

[0049] The local force analysis unit is used to obtain the force balance equations of the two scissor arms of the seat scissor suspension;

[0050] The suspension system vibration differential equation acquisition unit is communicatively connected to the overall force analysis unit, the vibration-related force acquisition unit, and the local force analysis unit. It is used to combine the overall force balance equation of the seat with the calculation expressions of the air spring force, damper damping force, and friction force, as well as the force balance equation of the two scissor arms of the seat scissor suspension, to obtain the general form of the vibration differential equation of the scissor suspension seat vibration system under simple harmonic excitation.

[0051] The coefficient comparison unit is communicatively connected to the suspension system vibration differential equation acquisition unit, and is used to compare the coefficients of the obtained general form of the vibration differential equation to obtain the damping ratio calculation expression.

[0052] The equivalent damping calculation unit for the suspension system is communicatively connected to the coefficient comparison unit. It is used to combine the damping ratio calculation expression and the damping coefficient calculation expression to obtain the equivalent damping calculation expression for the scissor suspension seat vibration system.

[0053] The beneficial effects of the technical solutions provided in this application include at least the following:

[0054] By simplifying the model of the scissor suspension seat and performing force analysis on the simplified scissor suspension structure model, the damping calculation expression of the scissor suspension seat structure can be fully derived. This can improve the accuracy of the seat simulation model and reduce the error of the dynamic simulation calculation results. It can also provide guidance for the suspension design of air-suspended seats, improve the dynamic performance of seat products, and help improve passenger comfort and the competitiveness of seat products. Attached Figure Description

[0055] Figure 1 This is a flowchart illustrating the damping identification method for the scissor suspension seat of this application.

[0056] Figure 2 This is a simplified model diagram of a scissor suspension structure provided in an embodiment of this application;

[0057] Figure 3 is a diagram showing the overall stress analysis of the suspension provided in an embodiment of this application;

[0058] Figure 4. Force analysis diagram of the first shear bar in the embodiment of the present invention;

[0059] Figure 5. Force analysis diagram of the second shear bar in an embodiment of the present invention;

[0060] Figure 6 shows the seat dynamics model provided in the embodiment of this application;

[0061] Figure 7 A comparison chart of experimental results showing the variation of seat resonance frequency with different damping levels after using equivalent damping, provided for embodiments of this application;

[0062] Figure 8 A comparison chart of experimental results and the variation of seat transmission rate with different damping levels after using equivalent damping, provided for embodiments of this application;

[0063] Figure 9 A comparison of experimental results and the variation of seat resonance frequency with different damping levels after the use of equivalent damping in an embodiment of this application.

[0064] Figure 10 The graph shows the variation of seat transmission rate with different damping levels and the experimental results provided in this application embodiment, without the use of equivalent damping. Detailed Implementation

[0065] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0066] The terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus. The terms "first," "second," and "third," etc., are used to distinguish different objects, etc., and do not indicate a sequence, nor do they limit "first," "second," and "third" to different types.

[0067] In the description of the embodiments of this application, terms such as "exemplary," "for example," or "for instance" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "exemplary," "for example," or "for instance" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary," "for example," or "for instance" is intended to present the relevant concepts in a concrete manner.

[0068] In the description of the embodiments of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. The "and / or" in the text is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of this application, "multiple" means two or more.

[0069] In some processes described in the embodiments of this application, multiple operations or steps are included in a specific order. However, it should be understood that these operations or steps may not be executed in the order they appear in the embodiments of this application, or they may be executed in parallel. The sequence number of the operation is only used to distinguish different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed sequentially or in parallel, and these operations or steps may be combined.

[0070] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0071] This application focuses on the scissor suspension seat of a certain type of commercial vehicle, and involves a simplified structural model of the scissor suspension, force analysis, and friction damping calculation.

[0072] Please refer to Figure 1 This application provides a damping identification method for a scissor suspension seat, comprising the following steps:

[0073] Step S1: Simplify the scissor suspension structure of the seat to obtain a simplified model of the scissor suspension structure;

[0074] Step S2: Perform force analysis on the simplified model of the scissor suspension structure to obtain the equivalent damping calculation expression of the scissor suspension seat vibration system;

[0075] Step S3: Obtain the equivalent damping calculation expression for a general vibration system;

[0076] Step S4: Obtain the equivalent damping calculation expression for the scissor suspension seat based on the equivalent damping calculation expression for the scissor suspension seat vibration system and the equivalent damping calculation expression for a general vibration system.

[0077] The damping identification method for scissor suspension seats provided in this application can improve the accuracy of seat simulation models and reduce the error in dynamic simulation calculations; it can provide guidance for the suspension design of air-suspended seats, improve the dynamic performance of seat products, and help enhance passenger comfort and the competitiveness of seat products.

[0078] In one embodiment, such as Figure 2 As shown, step S1 involves simplifying the scissor suspension structure of the seat to obtain the following simplified scissor suspension structure model:

[0079] The upper seat plate 1 and the lower seat plate 4 are connected by two scissor rods hinged at point O;

[0080] The first scissor bar 3 intersects with the upper seat plate 1 at point A. The lower end of the first scissor bar 3 at point B can slide along the track in the straight groove on the right side of the seat base plate 1.

[0081] The second scissor bar 2 intersects the upper seat plate 1 at D, and the second scissor bar 2 intersects the lower seat plate 4 at C;

[0082] The air spring 5 has a stiffness of K and is arranged between the two scissor bars and the seat base plate 4. The vibration damper 6 is arranged on the crossbar between the seat base plate 4 and the scissor frame. The force of the air spring and the damping force of the vibration damper 6 are applied to the seat upper plate 1 through the scissor bars.

[0083] The angle between the first shear bar 3 and the seat base 4 is: The angle between the second scissor bar 2 and the seat base plate 4 is .

[0084] In one embodiment, step S2: performing a force analysis on the simplified model of the scissor suspension structure to obtain the equivalent damping calculation expression for the scissor suspension seat vibration system, specifically includes the following steps:

[0085] Step S21: Establish the overall force balance equation for the seat;

[0086] Step S22: Obtain the calculation expressions for air spring force, damper damping force, and friction force;

[0087] Step S23: Obtain the force balance equations for the two scissor arms of the seat scissor suspension;

[0088] Step S24: Combine the overall force balance equation of the seat with the calculation expressions for the air spring force, damper damping force and friction force, as well as the force balance equation of the two scissor arms of the scissor suspension of the seat, to obtain the general form of the vibration differential equation of the scissor suspension seat vibration system under simple harmonic excitation.

[0089] Step S25: Compare the coefficients of the obtained general form of the vibration differential equation to obtain the expression for calculating the damping ratio;

[0090] Step S26: Combine the damping ratio calculation expression and the damping coefficient calculation expression to obtain the equivalent damping calculation expression of the scissor suspension seat vibration system.

[0091] In one embodiment, such as Figure 3 As shown, step S21: Establish the overall force balance equation of the seat, as shown in the following formula:

[0092] Equation (1)

[0093] In the formula, This is the force balance equation for the vibrating system in the X direction; Here is the force balance equation for the vibrating system in the Y direction; The simplified model of the scissor suspension structure provides the overall moment balance equations. The force acting at point C is in the X direction. The force acting at point B is in the X direction. The damping force of the damper; The force acting in the Y direction at point C; The force acting at point B is in the Y direction. This refers to the overall weight of the suspension.

[0094] In one embodiment, in step S22:

[0095] The expression for calculating the air spring force is shown below:

[0096] Equation (2)

[0097] In the formula, The force is the air spring force; The spring constant of an air spring, usually measured in units of 1000 ppm. ; This is the initial length of the air spring; This is the length of the air spring after deformation; This is the first length variable of the vibration system; This is the second length variable of the vibration system;

[0098] The expression for calculating the damping force of the damper is shown below:

[0099] Equation (3)

[0100] In the formula, The damping force of the damper; This is the damping coefficient, usually measured in units of 1000 ppm. ; The current speed of the damper; The initial velocity of the damper;

[0101] The formula for calculating friction force is shown below:

[0102] Equation (4)

[0103] In the formula, The frictional force at point B; The coefficient of friction; The pressure at point B is in the Y direction.

[0104] In one embodiment, step S23, obtaining the force balance equations of the two scissor arms of the seat scissor suspension, specifically includes the following steps:

[0105] Step S231: As Figure 4 As shown, force analysis of bar AB yields the following force equilibrium equation for the first shear bar:

[0106] Equation (5)

[0107] In the formula, The force balance equations are given in the X direction; The force equilibrium equations are given in the Y direction; The simplified model of the scissor suspension structure provides the force balance equations at the center point of the AB rod. The force acting at point O in the X direction is... The force acting on point A in the X direction is... The force acting at point B in the X direction is... The force acting at point B in the Y direction is... The force acting at point O in the Y direction is... The force acting on point A in the Y direction is... This is the first length variable of the vibration system; This is the second length variable of the vibration system.

[0108] Step S232: As Figure 5 As shown, force analysis of rod CD yields the following force equilibrium equation for the second shear rod:

[0109] Equation (6)

[0110] In the formula, The force balance equations are given in the X direction; The force equilibrium equations are as follows: The simplified model of the scissor suspension structure provides the force balance equations at the center point of the CD rod. The force acting at point C in the X direction is... The force acting at point O in the X direction is... The force acting on point D in the X direction is... The force acting at point C in the Y direction is... The force acting at point D in the Y direction is... The force acting at point O in the Y direction is... The force is the air spring force.

[0111] In one embodiment, step S24 involves simultaneously establishing the overall force balance equation of the seat, the calculation expressions for the air spring force, the damper damping force, and the friction force, as well as the force balance equation of the two scissor arms of the seat scissor suspension, to obtain the general form of the vibration differential equation of the scissor suspension seat vibration system under harmonic excitation. Specifically, this is implemented as follows:

[0112] Transforming equations (1), (2), (3), and (4), we obtain the expression for calculating the force in the Y direction at point B:

[0113] Equation (7)

[0114] In the formula, The force acting at point B in the Y direction; The spring constant of the air spring; For the overall weight of the suspension; The acceleration of the vibration system; This is the first length variable of the vibration system; This is the second length variable of the vibration system;

[0115] By combining equations (2), (3), (4), (5), (6), and (7), the general form of the vibration differential equation of the vibration system under simple harmonic excitation is obtained.

[0116] In one embodiment, step S25: compare the coefficients of the obtained general form of the vibration differential equation to obtain the damping ratio calculation expression, specifically implemented as follows:

[0117] The general form of the vibration differential equation of a system under harmonic excitation is compared with the second-order linear ordinary differential equation of a damped single-degree-of-freedom vibration system. conduct By comparing the coefficients of the terms, the damping ratio is obtained. The calculation expression is shown in the following formula:

[0118] Equation (8)

[0119] In the formula, The damping ratio; The initial angular velocity; For the overall weight of the suspension; The angle between the first scissor bar and the seat base; The angle between the second scissor bar and the seat base; This is the first length variable of the vibration system; This is the second length variable of the vibration system; This is the equivalent damping of a general vibration system.

[0120] In one embodiment, step S26: combining the damping ratio calculation expression and the damping coefficient calculation expression, the equivalent damping calculation expression of the scissor suspension seat vibration system is obtained, specifically implemented as follows:

[0121] Combined expressions for calculating damping ratio and damping coefficient The equivalent damping of the scissor suspension seat vibration system is obtained. The calculation expression is shown below:

[0122] Equation (9)

[0123] In the formula, The equivalent damping of the scissor suspension seat vibration system; This is the equivalent damping of a general vibration system; The angle between the first scissor bar and the seat base; The angle between the second scissor bar and the seat base; This is the first length variable of the vibration system; This is the second length variable of the vibration system.

[0124] In one embodiment, step S3: obtaining the equivalent damping calculation expression for a general vibration system specifically includes the following steps:

[0125] Step S31: Obtain the differential equation of motion for a mass-spring system with dry friction damping under a single degree of freedom;

[0126] Step S32: Give the initial displacement excitation and steady-state displacement response of the mass-spring system;

[0127] Step S33: Derive the calculation expressions for the negative work done by the damping force and the work done by the friction force in one cycle of the scissor suspension seat when there is dry friction damping force in the scissor suspension seat;

[0128] Step S34: Combine the calculation expressions for the negative work done by the damping force and the work done by the friction force, and obtain the calculation expression for the equivalent damping of a general vibration system according to the equivalent viscous damping law.

[0129] In one embodiment, step S31 involves obtaining the differential equation of motion for a mass-spring system with dry friction damping under a single degree of freedom, as shown in the following equation:

[0130] Equation (10)

[0131] Equation (11)

[0132] In the formula, For the overall weight of the suspension; Let be the acceleration of the vibrating system at time t; The steady-state response of the vibration system; The stiffness of the vibrating system; Friction; For excitation force; The coefficient of friction; This represents the normal pressure on the friction surface.

[0133] In one embodiment, step S32: The initial displacement excitation and steady-state displacement response of the vibration system are given, as shown in the following equation:

[0134] The expression for calculating the initial displacement excitation of a vibration system is:

[0135] Equation (12)

[0136] In the formula, This represents the initial displacement of the vibration system; It is the initial amplitude of the vibrating system; Angular frequency; For time.

[0137] The expression for calculating the steady-state displacement response of a vibration system is:

[0138] Equation (13)

[0139] In the formula, For the vibration system in Displacement at any given moment; This represents the current amplitude. The phase angle represents the starting position of the vibration.

[0140] In one embodiment, step S33: derive the expression for calculating the negative work done by the damping force in one cycle when there is dry friction damping force in the scissor suspension seat;

[0141] Equation (14)

[0142] In the formula, The work done by the damping force of the vibration system over one period T; Let c be the velocity of the vibration system at time t; and let c be the equivalent damping of the general vibration system. This represents the current amplitude. Angular frequency; The phase angle represents the starting position of the vibration.

[0143] In one embodiment, step S33: derive the work done by friction in one cycle of the vibration system of the scissor suspension seat when dry friction damping force exists in the scissor suspension seat. :

[0144] Equation (15)

[0145] In the formula, The work done by friction during one cycle of the vibrating system; Friction; This represents the current amplitude of the vibration system.

[0146] In one embodiment, step S34: Combine equations (14) and (15) to calculate the negative work done by the damping force and the work done by the friction force. According to the equivalent viscous damping law, the calculation expression of the equivalent damping of a general vibration system is obtained, as shown in the following equation:

[0147] Equation (16)

[0148] In the formula, This is the equivalent damping of a general vibration system; Friction; This represents the current amplitude of the vibration system. ω is the angular velocity; A is the current amplitude.

[0149] In one embodiment, step S4: obtaining the equivalent damping calculation expression for the scissor suspension seat based on the equivalent damping calculation expression for the scissor suspension seat vibration system and the equivalent damping calculation expression for a general vibration system, specifically implemented as follows:

[0150] Combining equations (9) and (16), the final equivalent damping of the scissor suspension seat vibration system is obtained. The calculation expression is shown below:

[0151] Equation (16)

[0152] The structural parameters of the scissor suspension seat for this model are shown in Table 1 below:

[0153] Table 1 Structural parameters of a certain model of scissor suspension seat

[0154]

[0155] Based on the structural parameters of the scissor suspension seat in Table 1 and Equation (17), the equivalent damping of the simplified model of the scissor suspension structure of this model is calculated to be 11.193 N·s / mm.

[0156] Based on the above data, a multibody dynamics model of the seat is established, such as... Figure 6 As shown.

[0157] Similarly, following the above method, different damping values ​​were selected, and the calculated equivalent damping values ​​were substituted into the simulation calculations. The resulting changes in seat resonance frequency and transmissibility with different damping levels were compared with experimental results. Figures 7-8 As shown.

[0158] The equivalent damping value was not used in the dynamic simulation. The calculated dynamic simulation results are as follows: Figures 9-10 As shown.

[0159] By comparing the calculations, the error in the calculation of the resonant frequency obtained by the above method is reduced by 10.9%, and the error in the calculation of the transmissibility is reduced by 15.3%.

[0160] In summary, the damping identification method for scissor suspension seats proposed in this application can improve the accuracy of simulation models, resulting in smaller errors in dynamic simulation calculations. It can provide guidance for the suspension design of air-suspended seats, improve the dynamic performance of seat products, and help enhance passenger comfort and product competitiveness.

[0161] Secondly, this application provides a system for identifying the friction damping of a scissor suspension seat, comprising:

[0162] The simplified model acquisition module is used to simplify the scissor suspension structure of the seat and obtain a simplified model of the scissor suspension structure.

[0163] The scissor suspension system equivalent damping calculation module is communicatively connected to the simplified model acquisition module to perform force analysis on the simplified model of the scissor suspension structure and obtain the equivalent damping calculation expression of the scissor suspension seat vibration system.

[0164] The equivalent damping calculation module for general vibration systems is used to obtain the equivalent damping calculation expression for general vibration systems.

[0165] The scissor suspension seat equivalent damping calculation module is communicatively connected to the scissor suspension system equivalent damping calculation module and the general vibration system equivalent damping calculation module. It is used to obtain the equivalent damping calculation expression of the scissor suspension seat based on the equivalent damping calculation expression of the scissor suspension seat vibration system and the equivalent damping calculation expression of the general vibration system.

[0166] In one embodiment, the scissor suspension system equivalent damping calculation module includes:

[0167] The overall force analysis unit is used to establish the overall force equilibrium equation of the seat;

[0168] The vibration-related force acquisition unit is used to obtain the calculation expressions for air spring force, damper damping force, and friction force.

[0169] The local force analysis unit is used to obtain the force balance equations of the two scissor arms of the seat scissor suspension;

[0170] The suspension system vibration differential equation acquisition unit is communicatively connected to the overall force analysis unit, the vibration-related force acquisition unit, and the local force analysis unit. It is used to combine the overall force balance equation of the seat with the calculation expressions of the air spring force, damper damping force, and friction force, as well as the force balance equation of the two scissor arms of the seat scissor suspension, to obtain the general form of the vibration differential equation of the scissor suspension seat vibration system under simple harmonic excitation.

[0171] The coefficient comparison unit is communicatively connected to the suspension system vibration differential equation acquisition unit, and is used to compare the coefficients of the obtained general form of the vibration differential equation to obtain the damping ratio calculation expression.

[0172] The equivalent damping calculation unit for the suspension system is communicatively connected to the coefficient comparison unit. It is used to combine the damping ratio calculation expression and the damping coefficient calculation expression to obtain the equivalent damping calculation expression for the scissor suspension seat vibration system.

[0173] The functions of each module in the above-mentioned scissor suspension seat friction damping identification system correspond to the steps in the above-mentioned scissor suspension seat damping identification method embodiment, and their functions and implementation processes will not be described in detail here.

[0174] Thirdly, embodiments of this application provide a device for identifying the friction damping of a scissor suspension seat. The device for identifying the friction damping of a scissor suspension seat can be a personal computer (PC), a laptop computer, a server, or other device with data processing capabilities.

[0175] The communication interface includes input / output (I / O) interfaces, physical interfaces, and logical interfaces used for interconnecting internal components of the scissor suspension seat friction damping identification device, as well as interfaces used for interconnecting the scissor suspension seat friction damping identification device with other devices (such as other computing devices or user equipment). Physical interfaces can be Ethernet interfaces, fiber optic interfaces, ATM interfaces, etc.; user equipment can be displays, keyboards, etc.

[0176] Memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0177] The processor can be a general-purpose processor, which can call the identification program for scissor suspension seat friction damping stored in memory and execute the damping identification method for scissor suspension seats provided in the embodiments of this application. For example, the general-purpose processor can be a central processing unit (CPU). The method executed when the identification program for scissor suspension seat friction damping is called can refer to the various embodiments of the damping identification method for scissor suspension seats in this application, and will not be repeated here.

[0178] Fourthly, embodiments of this application also provide a readable storage medium.

[0179] The present application has a storage medium storing a program for identifying the friction damping of a scissor suspension seat, wherein when the program for identifying the friction damping of the scissor suspension seat is executed by a processor, the steps of the damping identification method for the scissor suspension seat as described above are implemented.

[0180] The method implemented when the scissor suspension seat friction damping identification procedure is executed can be referred to in various embodiments of the damping identification method for scissor suspension seats in this application, and will not be repeated here.

[0181] It should be noted that the sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0182] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device to execute the methods described in the various embodiments of this application.

[0183] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A method for identifying the damping of a scissor suspension seat, characterized in that, Includes the following steps: The scissor suspension structure of the seat is simplified to obtain a simplified model of the scissor suspension structure; Force analysis was performed on a simplified model of the scissor suspension structure to obtain the equivalent damping calculation expression for the scissor suspension seat vibration system; Obtain the equivalent damping calculation expression for a general vibration system; Based on the equivalent damping calculation expression of the scissor suspension seat vibration system and the equivalent damping calculation expression of the general vibration system, the equivalent damping calculation expression of the scissor suspension seat is obtained. The stress analysis of the simplified model of the scissor suspension structure to obtain the equivalent damping calculation expression of the scissor suspension seat vibration system specifically includes the following steps: Establish the overall force balance equation for the seat; Obtain the calculation expressions for air spring force, damper damping force, and friction force; Obtain the force balance equations for the two scissor arms of the seat scissor suspension; By combining the overall force balance equation of the seat with the calculation expressions for the air spring force, damper damping force and friction force, and the force balance equation of the two scissor rods of the scissor suspension, the general form of the vibration differential equation of the scissor suspension seat vibration system under simple harmonic excitation is obtained. By comparing the coefficients of the obtained general form of the vibration differential equation, the expression for calculating the damping ratio is obtained; By combining the expressions for calculating the damping ratio and the damping coefficient, the equivalent damping calculation expression for the scissor suspension seat vibration system is obtained. The process of obtaining the equivalent damping calculation expression for a general vibration system specifically includes the following steps: Obtain the differential equation of motion for a mass-spring system with dry friction damping under a single degree of freedom; Give the initial displacement excitation and steady-state displacement response of the mass-spring system; Derivation of the calculation expressions for the negative work done by the damping force and the work done by the friction force in one cycle of a scissor suspension seat when dry friction damping force exists in the scissor suspension seat; By combining the expressions for the negative work done by the damping force and the work done by the frictional force, and applying the equivalent viscous damping rule, we can obtain the expression for the equivalent damping of a general vibration system.

2. The damping identification method for a scissor suspension seat as described in claim 1, characterized in that, The overall force balance equation of the seat is shown below: In the formula, This is the force balance equation for the vibrating system in the X direction; Here is the force balance equation for the vibrating system in the Y direction; The simplified model of the scissor suspension structure provides the overall moment balance equations. The force acting at point C is in the X direction. The force acting at point B is in the X direction. The damping force of the damper; The force acting in the Y direction at point C; The force acting at point B is in the Y direction. For the overall weight of the suspension; The acceleration of the vibration system; The force is the air spring force; The angle between the first scissor bar of the seat scissor suspension and the seat base plate; The angle between the second scissor bar of the seat scissor suspension and the seat floor. This is the second length variable of the vibration system.

3. The damping identification method for a scissor suspension seat as described in claim 1, characterized in that, Obtaining the force balance equations for the two scissor arms of the seat scissor suspension specifically includes the following steps: Force analysis of the first shear bar yields the following force equilibrium equation: In the formula, The force balance equations are given in the X direction; The force equilibrium equations are given in the Y direction; The force balance equation at the center point of the AB rod in the simplified model of the scissor suspension structure; The force acting at point O in the X direction; The force acting at point A in the X direction; The force acting at point B in the X direction; The force acting at point B in the Y direction; The force acting at point O in the X direction; The force acting at point A in the Y direction; This is the first length variable of the vibration system; This is the second length variable of the vibration system; Force analysis of the second shear bar yields the following force equilibrium equations: In the formula, The force balance equations are given in the X direction; The force equilibrium equations are as follows: The simplified model of the scissor suspension structure provides the force balance equations at the center point of the CD rod. The force acting at point C in the X direction is... The force acting at point O in the X direction is... The force acting on point D in the X direction is... The force acting at point C in the Y direction is... The force acting at point D in the Y direction is... The force acting at point O in the Y direction is... The force is the air spring force.

4. The damping identification method for a scissor suspension seat as described in claim 1, characterized in that, The expression for calculating the damping ratio is shown below: In the formula, The damping ratio; The initial angular velocity, For the overall weight of the suspension; The angle between the first scissor bar and the seat base; The angle between the second scissor bar and the seat base; This is the first length variable of the vibration system; This is the second length variable of the vibration system; This is the equivalent damping of a general vibration system; μ is the coefficient of friction.

5. The damping identification method for a scissor suspension seat as described in claim 1, characterized in that, The equivalent damping calculation expression for the scissor suspension seat vibration system is shown in the following formula: In the formula, The equivalent damping of the scissor suspension seat vibration system; This is the equivalent damping of a general vibration system; The angle between the first scissor bar and the seat base; The angle between the second scissor bar and the seat base; This is the first length variable of the vibration system; This is the second length variable of the vibration system; μ is the coefficient of friction.

6. The damping identification method for a scissor suspension seat as described in claim 1, characterized in that, The equivalent damping calculation expression is shown in the following formula: In the formula, This is the equivalent damping of a general vibration system; Friction; This represents the current amplitude of the vibration system. Angular velocity; This represents the current amplitude.

7. A system for identifying the friction damping of a scissor suspension seat using the damping identification method according to any one of claims 1 to 5, characterized in that, include: The simplified model acquisition module is used to simplify the scissor suspension structure of the seat and obtain a simplified model of the scissor suspension structure. The scissor suspension system equivalent damping calculation module is communicatively connected to the simplified model acquisition module. It performs force analysis on the simplified model of the scissor suspension structure and obtains the equivalent damping calculation expression of the scissor suspension seat vibration system. The equivalent damping calculation module for general vibration systems is used to obtain the equivalent damping calculation expression for general vibration systems. The scissor suspension seat equivalent damping calculation module is communicatively connected to the scissor suspension system equivalent damping calculation module and the general vibration system equivalent damping calculation module. It is used to obtain the equivalent damping calculation expression of the scissor suspension seat based on the equivalent damping calculation expression of the scissor suspension seat vibration system and the equivalent damping calculation expression of the general vibration system.

8. The scissor suspension seat friction damping identification system as described in claim 7, characterized in that, The equivalent damping calculation module for the scissor suspension system includes: The overall force analysis unit is used to establish the overall force equilibrium equation of the seat; The vibration-related force acquisition unit is used to obtain the calculation expressions for air spring force, damper damping force, and friction force. The local force analysis unit is used to obtain the force balance equations of the two scissor arms of the seat scissor suspension; The suspension system vibration differential equation acquisition unit is communicatively connected to the overall force analysis unit, the vibration-related force acquisition unit, and the local force analysis unit. It is used to combine the overall force balance equation of the seat with the calculation expressions of the air spring force, damper damping force, and friction force, as well as the force balance equation of the two scissor arms of the seat scissor suspension, to obtain the general form of the vibration differential equation of the scissor suspension seat vibration system under simple harmonic excitation. The coefficient comparison unit is communicatively connected to the suspension system vibration differential equation acquisition unit, and is used to compare the coefficients of the obtained general form of the vibration differential equation to obtain the damping ratio calculation expression. The equivalent damping calculation unit for the suspension system is communicatively connected to the coefficient comparison unit. It is used to combine the damping ratio calculation expression and the damping coefficient calculation expression to obtain the equivalent damping calculation expression for the scissor suspension seat vibration system.

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