Rocket adapter optimization structural design method considering dynamics parameters

Abstract

The application relates to the technical field of rocket adapter structure design, in particular to a rocket adapter optimization structure design method considering dynamic parameters, which comprises the following steps: structure model design, adapter design, topology optimization, detailed design index, optimization variable determination, sensitivity analysis, optimization design target, structure optimization design and dynamics and strength checking. The rocket adapter optimization structure design method considering dynamic parameters avoids the design defects to the downstream professional in the initial design stage, avoids unnecessary adapter repeated design, improves design efficiency, reduces risks and saves costs, and includes factors recommended to be considered in each design stage, the setting method of the optimization target is explained in detail, certain recommended values are given, and a complete adapter design method considering dynamic parameters is formed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rocket adapter structure design, in particular to a rocket adapter optimization structure design method considering dynamic parameters. BACKGROUND

[0002] According to different satellite structure designs, the launch vehicle adapter needs to be designed according to the task requirements, and the general adapter design takes structural emphasis as the main design index. Since the dynamic effects caused by the coupling of the satellite, the adapter and the rocket body are not considered in the original design process, the satellite mechanical environment is deteriorated, which further leads to excessive cost for improving the mechanical environment in the later stage or leads to flight failure. In addition, in the case of arranging key control units on the adapter, the method of dynamic effects will directly lead to the increase of the difficulty of control system design or even restrict some control parameters, and thus needs to be improved. SUMMARY

[0003] The present application provides a rocket adapter optimization structure design method considering dynamic parameters to improve the following technical problems:

[0004] The common rocket adapter optimization structure design method does not consider the dynamic effects caused by the coupling of the satellite, the adapter and the rocket body in the original design process, which leads to the deterioration of the satellite mechanical environment and further leads to excessive cost for improving the mechanical environment in the later stage or leads to flight failure.

[0005] The present application provides a rocket adapter optimization structure design method considering dynamic parameters, which adopts the following technical scheme:

[0006] A rocket adapter optimization structure design method considering dynamic parameters includes the following steps:

[0007] Step one, structure model design: the rocket body structure model except the adapter, the first interface structure is arranged between the satellite and the adapter, the second interface structure is arranged between the adapter and the rocket body structure, the main body of the rocket body structure model is a beam model capable of reflecting the dynamic characteristics of the rocket body structure, the dynamic characteristics of the rocket body structure include frequency characteristics and mode shape characteristics, and a three-dimensional model is constructed at the first interface structure and the second interface structure;

[0008] Step two, adapter design: the design area of the adapter is demarcated, and the design area is meshed;

[0009] Step three, topology optimization: different boundary conditions and load cases are set according to the load profile, and the strength index is considered; the calculation condition of the mode is set, and the first-order frequency of the structure is taken as the dynamic design index of this stage; in the target setting of topology optimization, the minimum mass or minimum stress is taken as the target, and the parameters of other constraints are set as forced constraint items, and the topology optimization work is carried out;

[0010] Step four, detailed design index: in the structural optimization design, the basic design index includes: structure mass, stress, deformation, the dynamic design index includes: response under vibration environment, amplification coefficient, vibration mode, vibration mode slope;

[0011] Step five, optimization variable determination: in the structural optimization, the optimization target can be determined according to the preliminary design, or the design target can be directly determined according to the past design experience and design standard;

[0012] Step six, sensitivity analysis: the influence of each adapter design parameter on the design index is calculated, so as to further screen the key design index, which can be calculated according to the following formula:

[0013]

[0014] In the formula: x i is the design parameter, y i is the design index; S is the sensitivity of the design index y i to the design parameter x i ; Δ parameter represents the change amount;

[0015] Step seven, optimization design target: in the adapter design, the index is divided into the first type parameter and the second type parameter,

[0016] The first type parameter includes: stress, displacement, vibration response, the first type parameter only needs to meet the basic requirement, and the first type parameter is directly set as strong constraint;

[0017] The second type parameter includes: adapter mass, important electrical equipment position first order modal key control parameter, the second type parameter needs to be further optimized in addition to meeting the basic requirement, and the second type parameter is designed as the optimization target, and is converted into a single optimization target through the following formula:

[0018]

[0019] In the formula, it is divided into two parts, wherein the first half is the parameter B which is expected to be as small as possible, B is the design index, b is the calculated value of the index B in iteration, ji represents the jth design index under the ith working condition; The latter part represents the parameter A which is expected to be as large as possible, A represents the design index, a represents the calculated value in optimization design, mn represents the nth design index under the mth working condition; C, p represent the weighting coefficient of the item, which is divided into amplification coefficient c and exponential coefficient p;

[0020] Step eight, structure optimization design: according to the set target and design parameter to carry out the detailed design work of structure, the design parameters include the size of structure, the height of structure reinforcing rib, the thickness of plate, through setting optimization variable and optimization boundary to cooperate optimization target and constraint condition to carry out optimization design, according to the optimization result to finally complete the detailed design work;

[0021] Step nine, dynamics, strength checking: to check the required parameters one by one, to judge whether to meet the design index, if not, then according to the prior design to carry out the detailed size optimization design work, highlight the points of not meeting the index, then carry out optimization, finally complete the adapter design work considering the adapter dynamics parameters in the design stage.

[0022] Optionally, the constraint conditions include mass, stress under load condition, modal frequency, according to the topology optimization result, to obtain the grid material density distribution in the design area under the target and constraint condition, to reflect the corresponding material at the corresponding position can play a key role, and according to the distribution to carry out preliminary structure design; in the optimization parameter setting, the stress constraint is not set as complete strong constraint, and the stress parameter is allowed to exceed the constraint value; in the frequency constraint, set as the lower limit value of frequency.

[0023] Optionally, the index requirements in step four are as follows:

[0024] a) the structure mass is less than Akg;

[0025] b) the structure stress under the determined load is less than Bmpa;

[0026] c) the maximum displacement of the structure under the determined static load is less than Cmm;

[0027] d) the first order frequency of the structure under certain boundary conditions is greater than DHz;

[0028] e) the first order modal normalized mode shape of the key position of the arrow body is less than E;

[0029] f) the first order modal mode shape slope of the key position of the arrow body is less than F;

[0030] g) the first order modal mode shape slope of the important electrical equipment on the adapter is less than G;

[0031] h) the first order modal key control parameter of the important electrical equipment position on the adapter is less than H, the first order modal key control parameter includes: mode shape slope, excitation force, excitation force position mode;

[0032] i) the vibration acceleration response of the mounting surface of the important electrical equipment on the adapter under vibration environment is less than I times g; the satellite vibration acceleration response is not greater than J times g, and the displacement response is less than Kmm;

[0033] j) The acceleration response amplification factor from the lower end face of the adapter to the satellite mounting face at the first order frequency is not greater than L.

[0034] Optionally, in step seven, the parameter setting requirements are as follows:

[0035] a) The parameter setting needs to focus on the absolute value and the relative size of the change of the design index. The design index A needs to set the exponential coefficient p for the parameter with small change and key, the exponential coefficient is 0.1-0.5, for the parameter with relatively large change and not more than 100%, the exponential parameter is about 1, for the parameter with relatively large change, the exponential coefficient is 3-5;

[0036] b) The design index B needs to set the exponential coefficient p for the parameter with small change and key, the exponential coefficient is 0.05-0.2, for the parameter with relatively large change and not more than 100%, the exponential parameter is about 0.2-0.5, for the parameter with relatively large change, the exponential coefficient is 0.5-1;

[0037] c) After setting the exponential coefficient, the amplification coefficient c is set. After the exponential p, most of the design indexes will be below 1. According to the importance of the index, the amplification coefficient c is set, the value of c between important parameters and general parameters is not more than 5:1; The calculated value of the index parameter with large change needs to be paid special attention to, and the amplification coefficient c is adjusted to the relative level of other data, and then the amplification coefficient is adjusted according to the importance of the parameter;

[0038] d) For the parameter with sign change, a single design index constraint can be added as a limit, or the absolute value can be used to limit the sign;

[0039] e) In the setting of dynamic parameters, the following parameters are considered:

[0040] 1) The overall frequency of the structure, the local installation frequency of the inertial unit;

[0041] 2) The position mode shape and mode shape slope of the control force, the inertial unit and the rate gyro;

[0042] 3) The first order mode key control parameters of the important inertial unit position on the adapter, including: mode shape slope, excitation force, excitation force position mode;

[0043] 4) The frequency response function value at the natural frequency;

[0044] 5) The effective value of the random vibration response in the frequency band;

[0045] 6) The maximum deformation of the satellite under vibration environment.

[0046] Optionally, in step eight, if the optimization result does not exist or the optimization deviates from the expected target, the optimization target, the optimization boundary, and the constraint condition are re-conditioned, and the related optimization work is carried out again.

[0047] In summary, the present application includes at least one of the following beneficial technical effects:

[0048] In the setting of the dynamic parameters, the complexity of the characteristics, the basic frequency, the mode shape, the mode shape slope, and the frequency response function are important, but further in-depth internal relations need to be further explored, and the key parameters of the downstream professional (sensitivity analysis of the downstream professional parameters) are found. The change of the dynamics characteristics of the adapter structure is divided into the influence of the arrangement and the local, and there is a strong coupling relationship (for example, the change of the structure will affect the local and the overall shaping, thereby causing the whole rocket dynamics effect caused by the control position control force to be superimposed on the local inertial unit sensing device dynamics effect, and then fed back to the whole rocket control system). Therefore, the key parameters in the dynamic process need to be considered in the design, and the optimization target or the constraint condition is designed;

[0049] The dynamic characteristics parameters are considered in the early design stage to avoid the design defects to the downstream professional, causing unnecessary adapter repeated design, thereby improving the design efficiency, reducing the risk, saving the cost, and including the factors recommended to be considered in each design stage. The setting method of the optimization target is described in detail, and certain recommended values are given, forming a complete adapter design method considering the dynamics parameters;

[0050] In the traditional design process, the main indicators of the structure design are the structural stress and the need for stress of the material, and the structure can withstand and not be damaged under certain load conditions. Therefore, the structural stress and the need for stress of the material are the key parameters. In order to consider the dynamics characteristics in the design, the dynamics parameters need to be refined. In the early design stage, the structural frequency characteristics can be considered as the main dynamics parameter in the design. With the gradual deepening of the design, the frequency characteristics are gradually transitioned to the mode shape, the mode shape slope, and the vibration response of the structure. In this way, the dynamics effect is considered in the whole process of the structure design, avoiding a large number of subsequent dynamics problems and reducing the cost. BRIEF DESCRIPTION OF DRAWINGS

[0051] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating laborious work.

[0052] Figure 1is a structural schematic diagram of a structural model in the embodiment of the present application.

[0053] Figure 2 is a structural schematic diagram of a rocket adapter optimization structural design method considering a dynamic parameter in the embodiment of the present application.

[0054] Legend of reference signs:

[0055] 1, satellite; 2, adapter; 3, connecting piece; 4, rocket body structure. DETAILED DESCRIPTION

[0056] In order to make the technical problems to be solved, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0057] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0058] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0059] In addition, the terms "first", "second", "third", etc. are only used for description purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0060] The following will be described in combination with the drawings Figures 1-2 The present application will be further described in detail.

[0061] The embodiment of the present application discloses a rocket adapter optimization structural design method considering a dynamic parameter.

[0062] Referring to Figure 1 and Figure 2 The rocket adapter optimization structural design method considering a dynamic parameter includes the following steps:

[0063] Step one, structural model design S1: The model of the arrow body structure 4 except the adapter 2, the first interface structure is arranged between the satellite 1 and the adapter 2, the second interface structure is arranged between the adapter 2 and the arrow body structure 4, a plurality of connecting pieces 3 are arranged at the second interface structure, in order to realize the rapid iterative optimization design in the early stage, the main body of the model of the arrow body structure 4 is a beam model capable of reflecting the dynamic characteristics of the arrow body structure 4, the dynamic characteristics of the arrow body structure 4 include frequency characteristics and mode shape characteristics, and a three-dimensional model is constructed at the first interface structure and the second interface structure.

[0064] Step two, adapter design S2: The design area of the adapter 2 is demarcated, and the design area is meshed.

[0065] Step three, topology optimization S3: Different boundary conditions and load cases are set according to the load profile, and the strength index is considered; the calculation condition of the mode is set, and the first-order frequency of the structure is taken as the dynamic design index of this stage; in the target setting of topology optimization, the minimum mass or minimum stress is taken as the target, and the parameters of other constraints are set as forced constraint items, and the topology optimization work is carried out;

[0066] The constraint conditions include mass, stress under load condition, modal frequency and the like, according to the topology optimization result, the grid material density distribution in the design area under the target and constraint conditions is obtained, which is used to reflect the key role of the corresponding material at the corresponding position, and preliminary structural design is carried out according to the distribution; in the optimization parameter setting, the stress constraint is not set as a complete strong constraint, and the stress parameter is allowed to exceed the constraint value; in the frequency constraint, the lower limit value of the frequency is set.

[0067] Step four, detailed design index S4: In the structural optimization design, the basic design indexes include: structural mass, stress, deformation and the like, and the dynamic design indexes include: response under vibration environment, amplification coefficient, mode shape, mode shape slope and the like;

[0068] The requirements of each index in step four are as follows:

[0069] a) The structural mass is less than 30 kg (A is 30);

[0070] b) The structural stress under the determined load is less than 20 MPa (B is 20);

[0071] c) The maximum displacement of the structure under the determined static load is less than 10 mm (C is 10);

[0072] d) The first-order frequency of the structure under certain boundary conditions is greater than 30 Hz (D is 30);

[0073] e) The normalized mode shape of the first order mode of the key position of the missile body is less than 0.5 (E is 0.5);

[0074] f) The slope of the first order mode shape of the key position of the missile body is less than 0.6 (F is 0.5);

[0075] g) The slope of the first order mode shape of the important electrical equipment on the adapter 2 is less than 0.8 (G is 0.8);

[0076] h) The key control parameters of the first order mode of the important electrical equipment on the adapter 2 are less than 0.9 (H is 0.9), and the key control parameters of the first order mode include: mode shape slope, excitation force, excitation force position mode, etc.;

[0077] i) The vibration acceleration response of the mounting surface of the important electrical equipment on the adapter 2 under the vibration environment is less than 3g (I is 3); the vibration acceleration response of the satellite 1 is not greater than 4g (J is 4), and the displacement response is less than 10mm (K is 10), wherein g is the standard gravity acceleration;

[0078] j) The acceleration response amplification coefficient from the lower end surface of the adapter 2 to the mounting surface of the satellite 1 under the first order frequency is not greater than 2 (L is 2).

[0079] Step five, optimization variable determination S5: in the structure optimization, the optimization target can be determined according to the trial calculation of the preliminary design, or the design target can be directly determined according to the past design experience and design standard.

[0080] Step six, sensitivity analysis S6: the influence of each adapter 2 design parameter on the design index is calculated, so as to further screen the key design index, which can be calculated according to the following formula:

[0081]

[0082] In the formula: x i is the design parameter, y i is the design index; S is the sensitivity of the design index y i to the design parameter x i ; Δ parameter represents the change amount;

[0083] Through sensitivity analysis, in addition to the important structure design parameters of the key design index, the design index that cannot be improved through the existing design parameters can also be found, so that the preliminary design work of the structure needs to be carried out again to ensure that the design index can be achieved through optimization design.

[0084] Step seven, optimization design target S7: in the adapter 2 design, the index is divided into first type parameters and second type parameters,

[0085] The first type of parameters includes stress, displacement, vibration response, etc. The first type of parameters only needs to meet the basic requirements, and the first type of parameters is directly set as a strong constraint.

[0086] The second type of parameters includes the mass of the adapter 2, the position of the important electrical equipment on the adapter 2, and the first-order modal key control parameters, etc. The second type of parameters need to be further optimized in addition to meeting the basic requirements. The second type of parameters are designed as optimization targets, and are converted into a single optimization target by the following formula:

[0087]

[0088] In the formula, it is divided into two parts. The first half is a parameter B that is expected to be as small as possible. B is a design index, b is the calculated value of the index B in iteration, and ji indicates the jth design index under the ith working condition. The latter part indicates a parameter A that is expected to be as large as possible. A represents a design index, a represents a calculated value in optimization design, mn represents the nth design index under the mth working condition, and c and p represent the weighting coefficients of the item. The weighting coefficients are divided into amplification coefficients c and exponential coefficients p.

[0089] The requirements for parameter setting are as follows:

[0090] a) The setting of the parameters needs to focus on the absolute value and the relative size of the change of the design index. The exponential coefficient p needs to be set for the parameter that changes relatively small and is critical. The exponential coefficient is 0.1-0.5. For the parameter that changes relatively large and does not exceed 100%, the exponential parameter is about 1. For the parameter that changes relatively sharply, the exponential coefficient is 3-5.

[0091] b) For the design index B, the exponential coefficient p needs to be set for the parameter that changes relatively small and is critical. The exponential coefficient is 0.05-0.2. For the parameter that changes relatively large and does not exceed 100%, the exponential parameter is about 0.2-0.5. For the parameter that changes relatively sharply, the exponential coefficient is 0.5-1.

[0092] c) After setting the exponential coefficient, the amplification coefficient c is set. Most of the design indexes will fall below 1 after the exponential p. The amplification coefficient c is set according to the importance of the index. The ratio of the c value between the important parameter and the general parameter is not more than 5:1. The calculated value of the index parameter that changes relatively large needs to be paid special attention to. The amplification coefficient c is adjusted to a relatively level with other data, and then the important adjustment of the amplification coefficient between the parameters is considered.

[0093] d) For the parameter that has a sign that will change, a single design index constraint can be added as a limit, or the absolute value can be used to limit the sign.

[0094] e) In the dynamic parameter setting, the following parameters are considered:

[0095] 1) the overall frequency of the structure, the local installation frequency of the inertial unit;

[0096] 2) the control force, the inertial unit and the rate gyro position mode shape and mode shape slope;

[0097] 3) the first-order mode key control parameters of the important inertial unit position on the adapter 2, the first-order mode key control parameters including: mode shape slope, excitation force, excitation force position mode;

[0098] 4) the frequency response function value under the natural frequency;

[0099] 5) the effective value of the random vibration response in the frequency band;

[0100] 6) the maximum deformation of the satellite 1 under the vibration environment.

[0101] Step eight, structure optimization design S8: according to the set target and design parameter, carry out the detailed design work of the structure, the design parameter includes the size of the structure, the height of the structure reinforcing rib, the thickness of the plate, through setting optimization variable and optimization boundary, cooperate optimization target and constraint condition to carry out optimization design, according to the optimization result, finally complete the detailed design work;

[0102] In the optimization, there may be no optimization result, or the optimization result deviates from the expected target, which can be solved by adjusting the optimization target, optimization boundary and constraint condition, and then carrying out related optimization work.

[0103] Step nine, dynamics and strength check S9: the required parameters are checked one by one to determine whether they meet the design index. If not, carry out detailed size optimization design work according to the existing design, highlight the points that do not meet the index, and then optimize, finally complete the adapter 2 design work considering the dynamics parameters of the adapter 2 in the design stage.

[0104] The beneficial technical effects of the rocket adapter 2 optimization structure design method considering the dynamics parameters in the embodiments are as follows:

[0105] In the dynamics parameter setting, the characteristics are complex. Although the basic frequency, mode shape, mode shape slope and frequency response function are important, further in-depth internal relationship needs to be explored to find the key parameters of downstream specialties (sensitivity analysis of downstream specialty parameters). The change of the dynamics characteristics of the adapter 2 structure is divided into overall and local effects, and there is a strong coupling relationship (for example, the change of the structure will affect the local and overall shaping, thereby causing the dynamics effect of the control position control force on the local inertial unit sensing device to be superimposed and then fed back to the overall control system), so the key parameters in the dynamic process need to be considered in the design, and designed into the optimization target or constraint condition;

[0106] In the early stage of design, dynamic characteristic parameters are considered to avoid design defects to downstream professionals, causing unnecessary adapter 2 repeated design, thereby improving design efficiency, reducing risk, saving cost and including various design stages need to consider the recommended factors, the setting method of optimization target is described in detail, and certain recommended values are given, forming a complete set of adapter 2 design method considering dynamics parameters;

[0107] In the traditional design process, the main index of structural design is structural stress, and under certain load conditions, the structure can withstand and not be damaged, so the structural stress and the required stress of the material are the key parameters. In order to consider the dynamics characteristics in the design, the dynamics parameters need to be refined. In the early stage of design, the structural frequency characteristics can be considered as the main dynamics parameter in the design. With the deepening of the design, the frequency characteristics are gradually transferred to the complex dynamics parameters such as mode shape, mode shape slope and vibration response. In this way, the dynamics effect is considered in the whole process of structural design, avoiding a large number of subsequent dynamics problems and reducing the cost.

[0108] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the application shall be included in the protection scope of the present application.

Claims

1. A method for optimizing the structural design of a rocket adapter taking into account dynamic parameters, characterized in that, Comprising the following steps: Step one, structural model design: the structure model of the missile body except the adapter, the first interface structure is arranged between the satellite and the adapter, the second interface structure is arranged between the adapter and the missile body structure, the main body of the missile body structure model is a beam model capable of reflecting the dynamic characteristics of the missile body structure, the dynamic characteristics of the missile body structure include frequency characteristics and mode shape characteristics, and a three-dimensional model is constructed at the first interface structure and the second interface structure; Step two, adapter design: demarcate the design area of the adapter, and divide the grid of the design area; Step three, topology optimization: set different boundary conditions and load cases according to the load profile, consider the strength index; set the calculation condition of the mode, and take the first-order frequency of the structure as the dynamic design index of this stage; in the target setting of topology optimization, take the minimum mass or minimum stress as the target, and set other constraint parameters as forced constraint items, and carry out topology optimization work; Step four, detailed design index: in the structural optimization design, the basic design indexes include: structural mass, stress, deformation, and the dynamic design indexes include: response under vibration environment, amplification coefficient, mode shape, and mode shape slope; Step five, optimization variable determination: in the structural optimization, the optimization target can be determined according to the trial calculation of the preliminary design, or the design target can be directly determined according to the past design experience and design standard; Step six, sensitivity analysis: calculate the influence of each adapter design parameter on the design index, so as to further screen the key design index, which can be calculated according to the following formula: where: x i is a design parameter, y i is a design index; S is a design index y i is the sensitivity of the design parameter x i ; Δ parameter represents the change amount; Step seven, optimization design target: in the adapter design, the indexes are divided into first-class parameters and second-class parameters, The first-class parameters include: stress, displacement, vibration response, and the first-class parameters only need to meet the basic requirements, and the first-class parameters are directly set as strong constraints; The second-class parameters include: adapter mass, important electrical equipment position first-order modal key control parameters on the adapter, and the second-class parameters need to be further optimized in addition to meeting the basic requirements, and the second-class parameters are designed as optimization targets, and are converted into single optimization targets through the following formula: In the formula, it is divided into two parts, wherein the first half is a parameter B that is expected to be as small as possible, B is a design index, b is the calculated value of the index B in iteration, ji indicates the jth design index under the jth working condition; the latter part indicates a parameter A that is expected to be as large as possible, A indicates a design index, a indicates a calculated value in optimization design, mn indicates the nth design index under the mth working condition; c, p indicate the weighting coefficients of the item, which are amplification coefficient c and exponential coefficient p; Step eight, structural optimization design: according to the set target and design parameter, carry out detailed design work of the structure, the design parameters include the size of the structure, the height of the structure reinforcing rib and the thickness of the plate, and the optimization design is carried out by setting the optimization variable and the optimization boundary in combination with the optimization target and the constraint condition, and the detailed design work is finally completed according to the optimization result; Step nine, dynamics, strength check: the required parameters are checked one by one to determine whether they meet the design indicators. If not, the existing design is used as a basis for detailed size optimization design work, focusing on the points that do not meet the indicators, and then optimization is performed to ultimately complete the adapter design work considering the adapter dynamics parameters in the design stage.

2. The method for optimizing the structural design of a rocket adapter considering dynamics parameters according to claim 1, characterized in that, In step three, the constraint conditions include mass, stress under load conditions, modal frequency, and the grid material density distribution in the design area under the target and constraint conditions is obtained according to the topology optimization results to reflect the key role of the corresponding material at the corresponding position, and preliminary structural design is carried out according to the distribution; in the optimization parameter setting, the stress constraint is not set as a complete strong constraint, and the stress parameter is allowed to exceed the constraint value; in the frequency constraint, the frequency lower limit value is set.

3. The method for optimizing the structural design of a rocket adapter considering dynamics parameters according to claim 1, characterized in that, The requirements for each indicator in step four are as follows: a) the structural mass is less than Akg; b) the structural stress under the determined load is less than BMPa; c) the maximum displacement of the structure under the determined static load is less than Cmm; d) the first-order frequency of the structure under certain boundary conditions is greater than DHz; e) the first-order modal normalized mode shape of the key position of the arrow body is less than E; f) the first-order modal mode shape slope of the key position of the arrow body is less than F; g) the first-order modal mode shape slope of the important electrical equipment on the adapter is less than G; h) the first-order modal key control parameters of the important electrical equipment position on the adapter, including mode shape slope, excitation force, and excitation force position mode, are less than H; i) the vibration acceleration response of the mounting surface of the important electrical equipment on the adapter under the vibration environment is less than I times g; the satellite vibration acceleration response is not greater than J times g, and the displacement response is less than Kmm; j) the acceleration response amplification coefficient from the lower end surface of the adapter to the satellite mounting surface under the first-order frequency is not greater than L.

4. The method for optimizing the structural design of a rocket adapter considering dynamics parameters according to claim 1, characterized in that, In step seven, the requirements for parameter setting are as follows: a) the absolute value and relative change of the design indicators should be focused on. The design indicator A requires setting an exponential coefficient p, with an exponential coefficient of 0.1-0.5 for parameters that change relatively little and are critical. For parameters that change relatively more but not more than 100%, the exponential parameter is about 1. For parameters that change relatively dramatically, the exponential coefficient is 3-5; b) for the design indicator B, the exponential coefficient p should be set for parameters that change relatively little and are critical, with an exponential coefficient of 0.05-0.

2. For parameters that change relatively more but not more than 100%, the exponential parameter is about 0.2-0.

5. For parameters that change relatively dramatically, the exponential coefficient is 0.5-1; c) after setting the exponential coefficient, the amplification coefficient c is set. After the exponential p, most design indicators will fall below 1. According to the importance of the indicators, the amplification coefficient c is set. The ratio of c values between important parameters and general parameters should not exceed 5:

1. Special attention should be paid to the calculation of the values of indicators with large changes, which are adjusted to a relatively level with other data through the amplification coefficient c, and then the important nature of the parameters is adjusted by adjusting the amplification coefficient; d) for parameters whose signs may change, a single design indicator constraint can be added as a limit, or the absolute value can be used to limit the sign. e) In the dynamic parameter setting, consider the parameters as follows: 1) The overall frequency of the structure, the local installation frequency of the inertial unit; 2) The control force, the inertial unit and the rate gyro position mode shape and mode shape slope; 3) The first-order mode key control parameters of the important inertial unit position on the adapter, including the mode shape slope, the excitation force, and the excitation force position mode shape; 4) The frequency response function value at the natural frequency; 5) The effective value of the random vibration response within the frequency band; 6) The maximum deformation of the satellite under vibration environment.

5. The method for optimizing the structural design of a rocket adapter considering dynamics parameters according to claim 1, characterized in that, In step eight, there may be no optimization results in the optimization, or the optimization currently deviates from the expected target. The optimization target, optimization boundary, and constraint conditions can be re-conditioned, and related optimization work can be carried out.

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