Variable characteristic splicing type simulation load suitable for different turntables and design method thereof

Abstract

This invention relates to turntable simulation loads, specifically to variable characteristic splicing simulation loads applicable to different turntables and their design methods, to address the shortcomings of existing technologies where simulation loads have fixed properties, poor adaptability, resulting in limited applicability, low reusability, and reduced debugging efficiency. The variable characteristic splicing simulation load of this invention, applicable to different turntables, includes a support base and at least one extended load connected to the support base. The upper end face of the support base has a cavity along its central axis as a weight-reducing cavity. The bottom surface of the support base is connected to the turntable mounting platform via a first connecting structure, and its side is connected to the extended load via a second connecting structure. The extended load includes an extension arm unit and / or a counterweight assembly, enabling rapid splicing and expansion through modular components.

Description

Technical Field

[0001] This invention relates to a simulated load for a turntable of an optoelectronic theodolite, specifically to a variable characteristic splicing simulated load applicable to different turntables and its design method. Background Technology

[0002] As the core moving component of an optoelectronic theodolite, the turntable plays a crucial role in carrying various optical measurement loads to achieve high-precision pointing and stable tracking. Its dynamic performance, including speed, acceleration, positioning accuracy, and tracking stability, is directly affected by the physical characteristics of the load, including its natural frequency, mass, moment of inertia, torsional stiffness, and center of mass position.

[0003] During the development and debugging phase of a turntable, to prevent damage to the mounted optical measurement payload due to unexpected situations such as turntable runaway, it is usually necessary to use a simulated load to replace the actual optical measurement payload for performance testing and parameter tuning of the turntable system. An ideal simulated load should be able to accurately reproduce the physical characteristics of the real load, such as natural frequency, mass, moment of inertia, torsional stiffness, and center of mass position. However, the current design and use of simulated loads have the following main problems:

[0004] (1) Traditional simulated loads are mostly specially designed. Once the load is manufactured, its inherent frequency, mass, moment of inertia and torsional stiffness are fixed and cannot be flexibly adjusted. Therefore, it can only simulate a single model or a specific type of load, and its applicability is limited.

[0005] (2) Different types of turntables have different load installation interfaces, resulting in poor adaptability of simulated loads and difficulty in being universal between different turntables, which increases the cost of non-standard design and manufacturing.

[0006] (3) In order to cover different test conditions, it is necessary to design and process various specifications of simulated loads. This not only significantly extends the project cycle, but also leads to the waste of materials and processing resources and reduces debugging efficiency.

[0007] Therefore, in order to solve the current design problems of specialized, multi-specification, and multi-installation interface of analog loads, it is urgent to develop a general-purpose analog load device with reconfigurability and adjustable multi-characteristic parameters to adapt to diverse turntable testing needs. Summary of the Invention

[0008] The purpose of this invention is to address the shortcomings of existing technologies, such as fixed properties of simulated loads, poor adaptability, limited applicability, low reusability, and reduced debugging efficiency. This invention provides a variable characteristic splicing simulated load applicable to different turntables and its design method.

[0009] To achieve the above objectives, the technical solution provided by this invention is as follows:

[0010] A variable characteristic splicing simulation load applicable to different turntables is characterized by: including a support base and at least one extended load connected to the support base; the bottom surface of the support base is connected to the turntable mounting platform via a first connecting structure, and its side is connected to the extended load via a second connecting structure; the extended load includes an extension arm unit and / or a counterweight assembly; the extension arm unit includes at least one extension arm assembly, one end of which is connected to the support base via the second connecting structure; the extension arm assembly includes at least one extension arm along its length; the counterweight assembly includes at least one counterweight block, which is connected to the support base via the second connecting structure or to the other end of the extension arm assembly.

[0011] Furthermore, the extended arm is provided with an H-shaped notch, and its sidewall is provided with a natural frequency adjustment component corresponding to the H-shaped notch.

[0012] Furthermore, the extended arm unit includes at least two parallel extended arm assemblies, with a natural frequency adjustment element between adjacent extended arm assemblies. The natural frequency adjustment element is connected to the corresponding two extended arms in the adjacent extended arm assemblies, or each extended arm assembly is provided with a natural frequency adjustment element, which is connected to the extended arm in its respective extended arm assembly.

[0013] Furthermore, the second connection structure is configured as a fitting structure, with the support base and the extended arm fitting together and fixedly connected by an L-shaped corner piece;

[0014] The counterweight block near the extended arm is connected to it via a second connecting structure and fixed with an L-shaped corner piece;

[0015] Multiple counterweights are provided, and adjacent counterweights are stacked together by a second connecting structure and fixed together by screws.

[0016] The extended arm assembly includes multiple extended arms along its length direction, adjacent extended arms are connected by a second connecting structure and fixed by connectors.

[0017] Furthermore, the interlocking structure is a T-shaped interlocking structure;

[0018] The inherent frequency adjustment component and the connecting component are both set as H-shaped corner pieces.

[0019] Furthermore, the outer contour of the support base is set as a regular polygon;

[0020] The upper end face of the support base is provided with a cavity along the central axis as a weight reduction cavity, and a reinforcing structure is provided in the weight reduction cavity;

[0021] The reinforcing structure includes a support column arranged along the central axis and reinforcing ribs radially distributed around the support column. One end of the reinforcing rib is connected to the support column, and the other end is connected to the side wall of the weight reduction cavity.

[0022] The first connection structure includes a T-slot on the turntable mounting platform, a T-bolt connection hole on the bottom surface of the support base, a T-bolt with the screw head in the T-slot and the stud passing through the T-bolt connection hole, and a nut for locking with the T-bolt.

[0023] Meanwhile, the present invention also provides a design method for the above-mentioned variable characteristic splicing simulated load applicable to different turntables, which is characterized by including the following steps:

[0024] Step S1: Determine the dynamic characteristic requirements of the load required for the turntable; the dynamic characteristic requirements include moment of inertia, natural frequency, and torsional stiffness.

[0025] Step S2: Select the support base, the number and setting method of the extended load, based on the moment of inertia, natural frequency, and torsional stiffness.

[0026] In extended load conditions, the quantity, length, and mass of the extended arm assembly and / or counterweight assembly satisfy the following relationships:

[0027]

[0028] in, To simulate the rotational inertia of the load, The moment of inertia of the support base; Let m be the moment of inertia of the extension arm assembly, and m be the number of extension arm assemblies. Let n be the moment of inertia of the counterweight assembly, and n be the number of counterweight assemblies.

[0029] Step S3: Adjust the quantity and setting method of the extended load through simulation to meet the dynamic characteristic requirements.

[0030] Furthermore, step S2 also includes setting an inherent frequency adjustment element between adjacent extension arm assemblies according to the torsional stiffness of the extension arm assembly, so as to adjust the torsional stiffness of the extension arm unit.

[0031] Furthermore, in step S2, the outer contour of the support base is set as a regular quadrilateral, and a weight-reducing cavity is set along the central axis on the upper end face. The weight-reducing cavity is cylindrical.

[0032] Moment of inertia of the support Moment of inertia of the extended arm assembly Moment of inertia of the counterweight components Calculated using the following formula:

[0033]

[0034]

[0035]

[0036] in, The mass of the solid body corresponding to the support; To reduce the mass of the solid cylinder corresponding to the weight reduction cavity, The radius of the weight reduction cavity, For the side length of the support, To increase the weight of the extension arm assembly, To extend the distance between the central axis of the arm assembly and the perpendicular line from the center of its mounting surface, To extend the length of the arm assembly, For the mass of the counterweight components, The length of the counterweight assembly along the extension arm.

[0037] Furthermore, in step S2, the natural frequency of the extended load... Satisfy the following formula:

[0038]

[0039] in, , , , , , These are the elements at the corresponding positions in the overall transfer matrix T of the extended arm unit.

[0040] Compared with the prior art, the present invention has the following beneficial technical effects:

[0041] 1. This invention is applicable to variable characteristic splicing simulated loads on different turntables. Different numbers of extended arm components can be quickly set in the same direction of the support base to form extended loads with various structural forms such as single beam, double beam, or triple beam. Rapid splicing and expansion are achieved through modular components. The core physical parameters of the simulated load, such as natural frequency, moment of inertia, and mass, can be quickly adjusted according to the dynamic characteristics of the target load. Through reconfigurable design, it can adapt to different turntables and different load installation methods, solving the problem of poor versatility of simulated loads between different test platforms. It achieves a breakthrough in the structural form, dynamic characteristics, and platform adaptability of the simulated load system, and has good technical universality and promotion value.

[0042] 2. The support base of the variable characteristic splicing simulated load applicable to different turntables of the present invention adopts a polygonal design. This design can dynamically adjust the mass distribution of the simulated load according to the different characteristics of the turntable load in the axial and radial directions. At the same time, its flexible interface design ensures effective adaptation to various turntable structures.

[0043] 3. This invention is applicable to variable characteristic splicing simulated loads on different turntables. By using standardized and reusable modular components, it replaces the traditional dedicated simulated load processing mode, which greatly shortens the test preparation cycle and avoids material waste and processing costs caused by changes in test requirements, thus having good economic benefits.

[0044] 4. This invention is applicable to variable characteristic splicing simulated loads on different turntables. By setting a natural frequency adjustment component on the extended arm assembly, and setting the natural frequency adjustment component as an H-shaped corner piece, it realizes independent adjustment and precise matching of key dynamic parameters such as torsional stiffness and natural frequency under the premise that the total mass and rotational inertia of the system remain basically unchanged or are precisely controllable.

[0045] 5. This invention provides a splicing simulation load scheme with adjustable characteristics and reconfigurable structure to achieve rapid simulation of diverse load characteristics on different turntable platforms. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the structure of the present invention, which is applicable to different turntables and uses a modular analog load.

[0047] Figure 2 This is a schematic diagram of the support base structure in the embodiment of the variable characteristic splicing simulated load applicable to different turntables of the present invention; wherein, a is a quadrilateral support base and b is a hexagonal support base;

[0048] Figure 3 This is a schematic diagram of the weight reduction cavity structure in the embodiment of the variable characteristic splicing simulated load applicable to different turntables of the present invention;

[0049] Figure 4 This is a schematic diagram of the support base bottom surface in an embodiment of the present invention applicable to different turntables using a variable characteristic splicing simulated load.

[0050] Figure 5 This is a schematic diagram of the installation structure of the support base in an embodiment of the present invention applicable to different turntables with a variable characteristic splicing simulated load.

[0051] Figure 6 This is a schematic diagram of the L-shaped corner piece in an embodiment of the present invention applicable to different turntables using a modular, simulated load design.

[0052] Figure 7 These are schematic diagrams of different extended arm units in the embodiment of the variable characteristic splicing simulated load applicable to different turntables of the present invention;

[0053] Figure 8 This is a schematic diagram of the extended arm in the embodiment of the variable characteristic splicing simulated load applicable to different turntables of the present invention; wherein, a is a three-dimensional structural schematic diagram of the extended arm, and b is a side structural schematic diagram of the extended arm.

[0054] Figure 9 This is a schematic diagram of the H-shaped corner piece in an embodiment of the present invention applicable to different turntables using a modular, simulated load design.

[0055] Figure 10 This is a partial structural diagram of the extended arm unit in an embodiment of the present invention applicable to different turntables using a modular, spliced ​​simulated load.

[0056] Figure 11 This is a schematic diagram of the structure of the first stacked counterweight block in the embodiment of the variable characteristic splicing simulated load applicable to different turntables of the present invention;

[0057] Figure 12 This is a schematic diagram of the connection structure of the support base, the extended arm, and the first stacked counterweight in the embodiment of the variable characteristic splicing simulated load applicable to different turntables of the present invention.

[0058] Figure 13 This is a schematic diagram of the connection structure of the first stacked counterweight block in an embodiment of the variable characteristic splicing simulated load applicable to different turntables of the present invention.

[0059] Figure 14 This is a schematic diagram of the structure of the second stacked counterweight block in the embodiment of the variable characteristic splicing simulated load applicable to different turntables of the present invention;

[0060] Figure 15 This is a schematic diagram of the structural design of an embodiment of the design method of variable characteristic splicing simulated load applicable to different turntables of the present invention.

[0061] Figure 16 This is a schematic diagram of the structure of the circular turntable mounting platform in an embodiment of the present invention applicable to different turntables using a variable characteristic splicing simulated load method;

[0062] Figure 17 This is a schematic diagram of the structure of the square turntable mounting platform in an embodiment of the present invention applicable to different turntables using a modular simulated load.

[0063] Figure 18 This is a schematic diagram of the connection structure of a single-axis turntable in an embodiment of the variable characteristic splicing simulated load applicable to different turntables of the present invention;

[0064] Figure 19 This is a schematic diagram of the intermediate single load (horizontal axis, azimuth axis) connection structure of the U-shaped turntable in the embodiment of the variable characteristic splicing simulated load applicable to different turntables of the present invention.

[0065] Figure 20 This is a schematic diagram of the intermediate single load (same direction) connection structure of the U-shaped turntable in the embodiment of the variable characteristic splicing simulated load applicable to different turntables of the present invention.

[0066] Figure 21 This is a schematic diagram of the intermediate dual-load connection structure of the U-shaped turntable in the embodiment of the variable characteristic splicing simulated load applicable to different turntables of the present invention.

[0067] Figure 22 This is a schematic diagram of the single load connection structure on both sides of the U-shaped turntable in the embodiment of the variable characteristic splicing simulated load applicable to different turntables of the present invention.

[0068] Figure 23 This is a schematic diagram of the dual-load connection structure on both sides of the U-shaped turntable in the embodiment of the variable characteristic splicing simulated load applicable to different turntables of the present invention.

[0069] Figure 24 This is a schematic diagram of the single load connection structure on both sides of a T-shaped turntable in an embodiment of the present invention for variable characteristic splicing simulated loads applicable to different turntables.

[0070] Figure 25 This is a schematic diagram of the dual-load structure on both sides of the T-shaped turntable in the embodiment of the variable characteristic splicing simulated load applicable to different turntables of the present invention.

[0071] The annotations in the attached figures are explained as follows:

[0072] 1-Support base, 2-Extended arm unit, 3-Counterweight assembly, 4-H-type corner bracket, 5-L-type corner bracket, 6-Turntable mounting platform, 7-T-slot, 8-Weight reduction cavity, 9-T-bolt connection hole, 10-Nut, 11-T-bolt, 12-Single-axis turntable, 13-U-type turntable, 14-T-type turntable, 15-Reinforcing structure, 16-Screw, 17-Extended load, 18-T-type boss, 19-H-type notch, 20-First stacked counterweight block, 21-Counterhead through hole, 22-Threaded hole, 23-Second stacked counterweight block, 24-Extended arm. Detailed Implementation

[0073] This invention is applicable to variable characteristic splicing analog load structures for different turntables, such as... Figure 1 As shown, it mainly includes a support base 1 and at least one extended load 17 connected to the support base 1, as well as fixing components such as L-shaped corner brackets 5 and H-shaped corner brackets 4. Through the flexible combination and position adjustment of the components, it can effectively simulate the installation method, mass distribution and inertial characteristics of different loads, and has good versatility and engineering applicability.

[0074] Support base 1 adopts a modular architecture design, with the following specific features:

[0075] (1) The outer contour is set as a polygon, which can be extended to connect 2, 4 or 6 extended loads 17. In order to simulate the natural frequency, mass and moment of inertia of different loads, the support 1 can be designed as a pentagon, hexagon or octagon and other polygonal configurations, such as Figure 2 As shown.

[0076] (2) The bottom surface of the support base 1 is provided with T-bolt connection holes 9, such as Figure 4 and Figure 5 As shown, a T-slot 7 is used to mate with the turntable mounting platform 6, in which a T-bolt 11 is installed. The threaded head of the T-bolt 11 is located in the T-slot 7, and the stud passes through the T-bolt connection hole 9. At the same time, a nut 10 is provided to engage with the T-bolt 11 for locking, so as to achieve quick installation and positioning. The T-bolt connection hole 9, the T-slot 7, the T-bolt 11, and the nut 10 form the first connection structure.

[0077] (3) The support base 1 is provided with a weight-reducing cavity 8 and a reinforcing structure 15, such as Figure 3 As shown, a cavity 8, a weight-reducing chamber, is formed along the central axis on the upper end surface of the support base 1. A reinforcing structure 15 is installed within the weight-reducing chamber 8. The reinforcing structure 15 includes a support column arranged along the central axis and reinforcing ribs radially distributed around the support column at 360°. One end of each reinforcing rib is connected to the support column, and the other end is connected to the side wall of the weight-reducing chamber 8. This effectively reduces the ineffective mass at the rotation center of the turntable while ensuring torsional stiffness.

[0078] (4) Connection with the extended load 17: The side of the support 1 is designed with a T-slot 7, which is fitted and connected with the T-shaped boss 18 corresponding to the extended load 17 to form a T-shaped fitting structure as a second connection structure. At the same time, it is used with an L-shaped corner piece 5 to achieve a fixed connection with the extended load 17. The L-shaped corner piece 5 is as follows: Figure 6 As shown. The T-slot 7 can be designed with multiple slots arranged in parallel as needed.

[0079] (5) The T-slot 7 can be arranged along the axial or vertical axis according to the characteristics of the load, such as its natural frequency, mass and moment of inertia, and is used to connect the extended load 17 of the horizontal axis and the azimuth axis, respectively.

[0080] The extended load 17 includes the extended arm unit 2 and / or the counterweight assembly 3. For example... Figure 7 As shown, the extended arm unit 2 includes at least one extended arm assembly, one end of which is connected to the support base 1 via a second connecting structure; the extended arm assembly includes at least one extended arm 24 along its length. The specific features of the extended arm unit 2 are as follows:

[0081] (1) such as Figure 8 As shown, the two ends of the extension arm 24 are respectively designed with T-shaped grooves 7 and T-shaped bosses 18. When the extension arm assembly includes multiple extension arms 24, adjacent extension arms 24 are connected by a second connection structure, that is, by fitting the T-shaped grooves 7 and T-shaped bosses 18 of adjacent extension arms 24 to form a T-shaped fitting structure, and are fixedly connected by a connector. In this embodiment, the connector is set as an H-shaped corner piece 4.

[0082] (2) The sidewall of the extended arm 24 is designed with an H-shaped notch 19, and a natural frequency adjustment component is provided corresponding to the H-shaped notch 19. For ease of processing, the natural frequency adjustment component is also set as an H-shaped corner piece 4, which is fixedly connected to the sidewall of the extended arm 24 along the length direction on both sides of the H-shaped notch 19. Multiple H-shaped corner pieces 4 can be distributed along the length direction of the extended arm assembly, thereby changing the natural frequency of the extended arm assembly itself in the length direction. The structure of the H-shaped corner piece 4 is as follows: Figure 9 As shown, the torsional frequency can be adjusted without significantly altering the system's weight and moment of inertia.

[0083] (3) When the extended arm unit 2 includes two or more parallel extended arm assemblies, the multiple extended arm assemblies are connected by multiple T-slots 7 arranged in parallel on the side of the support base 1, such as... Figure 10 As shown. Natural frequency adjustment components are provided between adjacent extension arm assemblies. The natural frequency adjustment components can be connected to the corresponding extension arm 24 in the adjacent extension arm assembly, that is, the two extension arms 24 corresponding to the two adjacent extension arm assemblies share a natural frequency adjustment component, or, each extension arm assembly is provided with a corresponding natural frequency adjustment component, and the natural frequency adjustment component is only connected to the extension arm 24 to which it is located, so as to adjust the torsional stiffness and natural frequency of the extension arm assembly.

[0084] The counterweight assembly 3 includes at least one counterweight block, which is connected to the support base 1 or to the other end of the extension arm assembly. The specific configuration of the counterweight assembly 3 is as follows:

[0085] (1) Multiple counterweights are stacked. One side of the counterweight is designed with a T-slot 7 and the other side is designed with a T-shaped boss 18. It is also equipped with a countersunk through hole 21 and a threaded hole 22 to realize the rapid stacking connection between the counterweights and adjust the natural frequency, mass and moment of inertia of the simulated load. In this embodiment, three T-slots 7 and T-shaped bosses 18 are arranged in parallel on each side of the counterweight.

[0086] (2) In this embodiment, the counterweight has two forms, referred to as the first stacked counterweight 20 and the second stacked counterweight 23, respectively. Figure 11 As shown, the first stacked counterweight 20 has threaded holes 22 on both sides of the three T-slots 7, and countersunk through holes 21 between adjacent T-slots 7. The first stacked counterweight 20 is positioned close to the extension arm 24, and the two are connected by a T-shaped interlocking structure and then fixed by L-shaped corner pieces 5. Figure 12 and 13 As shown; the second stacked counterweight 23 is provided with the same T-slot 7 and T-protrusion 18 as the first stacked counterweight 20, such as Figure 14As shown, countersunk through holes 21 are provided on both sides of the three T-slots 7, and threaded holes 22 are provided between adjacent T-slots 7, so that they can be alternately set with the first stacked counterweight block 20 to form a stable counterweight assembly 3.

[0087] (3) Based on the multiple extended arms 24 themselves as counterweights, it is possible to stack one or more counterweight blocks along the length of the extended arms 24. Adjacent counterweight blocks are connected by a T-shaped interlocking structure through the corresponding T-slots 7 and T-shaped protrusions 18 to form a counterweight quick adjustment system.

[0088] This invention, through modular design and assembly, supports the rapid assembly of simulated loads with different physical properties according to testing requirements. This design not only allows for flexible adjustment of the load's natural frequency, mass, moment of inertia, and center of mass position, but also adapts to different turntables and load installation methods, thereby achieving accurate simulation of various load installation forms and dynamic characteristics within a single system. The design of the moment of inertia, center of mass position, and natural frequency satisfies the following formulas. During the design process, the quantity, length, and mass of the extended arm assembly and / or counterweight assembly 3 are calculated using the following methods, and then the final design result is obtained through simulation adjustments, reducing the error between theoretical design and practical application.

[0089] 1. Design of rotational moment of inertia;

[0090] In this embodiment, the outer contour of the support base 1 is set as a regular quadrilateral, the weight reduction cavity 8 is a cylinder along the central axis, and the moment of inertia of the support base 1 is calculated by the following formula:

[0091]

[0092] in, The moment of inertia of support 1, The mass of the solid body corresponding to support 1; To reduce the mass of the solid cylinder corresponding to the weight reduction cavity 8, Let be the side length of support 1. Let 8 be the radius of the weight reduction cavity.

[0093] In other embodiments of the present invention, the outer contour of the support base 1 and the weight reduction cavity 8 can be set to other shapes, and their moment of inertia can be calculated using the corresponding formula.

[0094] The moment of inertia of the extended arm assembly is as follows:

[0095]

[0096]

[0097]

[0098] in, To extend the length of the arm assembly, To correspond to the number of extension arms 24 in the extension arm assembly, To extend the arm by 24, To increase the weight of the extension arm assembly, To increase the mass of the 24-inch extended arm, To increase the rotational inertia of the arm assembly, This is the distance between the central axis of the extension arm assembly and the vertical line from the center of its mounting surface.

[0099] The moment of inertia of counterweight assembly 3 is as follows:

[0100]

[0101]

[0102]

[0103] in, The length of counterweight assembly 3 along the length of the extended arm. This corresponds to the number of counterweight blocks in counterweight component 3. The length of the counterweight along the extension arm is [length]. For the mass of counterweight component 3, The mass of a single counterweight. Let be the moment of inertia of counterweight component 3.

[0104] If there is only one extended arm assembly and counterweight assembly 3, the rotational inertia of the simulated load is as follows:

[0105]

[0106] in, To simulate the rotational inertia of the load.

[0107] If there are m extended arm components and n counterweight components 3, then the rotational inertia of the simulated load is as follows:

[0108]

[0109] Therefore, the moment of inertia of the simulated load can be changed by using different numbers and lengths of extended arms 24 and counterweight components 3. Based on the moment of inertia required for testing, simulated loads that meet different design requirements can be designed.

[0110] 2. Design of the center of mass position;

[0111] Establish a rectangular coordinate system with the center of support 1 as the origin. The X-axis is along the length of the extended arm assembly, the Y-axis is perpendicular to its length, and the Z-axis is perpendicular to the XOY plane and located on the central axis of support 1. Consider the entire structure simulating the load as a system composed of finite mass points. Let the mass of the i-th mass point be... coordinates for Then the position of the centroid for:

[0112]

[0113] In this rectangular coordinate system, the coordinates of the centroid position are: ,but:

[0114]

[0115] like Figure 15 As shown, in this embodiment, the extended arm assembly is located on the XOY plane with Z=0, so the coordinates of the centroid are:

[0116]

[0117] in, The mass of support 1.

[0118] Therefore, by using the above formula and the requirement for the center of mass position, the required length and mass of the extended arm 24 and the counterweight assembly 3 can be obtained.

[0119] 3. Design of structural frequency;

[0120] The extension load 17 can be simply regarded as a series of straight rods with different stiffnesses connected together and a concentrated mass block at the end. The number of straight rods connected together is the number of extended arms 24 connected together in the corresponding extended arm assembly. The fixed frequency of the straight rods is considered in conjunction with the extended arms and the H-shaped corner pieces on them. The concentrated mass block is considered as a whole, taking the counterweight assembly 3 as an example. Using the transfer matrix method, the approximate solution of the natural frequency of the extension load 17 can be calculated in the following way.

[0121] The transfer matrix of the Pth straight rod :

[0122]

[0123] Among them, S, C, Sh, Ch, Both k and k are simplified versions of the matrix setup described above. , , , , , , For the mass of the corresponding straight rod, Lb Let EI be the length of the extension arm 24, and EI be the bending stiffness of the corresponding straight rod. When the extension arm unit 2 is equipped with only one extension arm assembly, the mass, length, and bending stiffness of the straight rod are the mass, length, and bending stiffness of the corresponding extension arm 24 in that extension arm assembly, respectively. When multiple extension arm assemblies are arranged in parallel, the mass, length, and bending stiffness of the straight rod are the sum of the masses of the extension arms 24 located at the same position in the length direction in the multiple extension arm assemblies, the length of the corresponding extension arm 24, and the equivalent bending stiffness, respectively.

[0124] The overall transfer matrix T of the extended arm unit 2 with P straight rods connected in series is:

[0125]

[0126] in, ... Let be the transfer matrix for the 1st, ..., P-1th straight rods in the extended arm unit.

[0127] Let T be the element in the overall transfer matrix T of the extended arm unit 2. rs r and s are the row and column of the overall transfer matrix T, respectively, and the natural frequency of the extended load 17. Satisfy the following formula:

[0128]

[0129] in, , , , , , These are the elements at the corresponding positions in the overall transfer matrix T.

[0130] Solving the above equations yields the natural frequency of the extended load 17.

[0131] Therefore, by designing different lengths and masses of the extended arm components and the counterweight component 3, the required natural frequency can be achieved. The mass of the L-shaped corner piece 5 is small and can be ignored.

[0132] The turntable mounting platform 6 mostly adopts two structural forms: circular and square, such as... Figure 16 and 17As shown, therefore, in order to enable better adaptability of the simulated load, the support base 1 achieves quick installation and locking with the turntable through the first connection structure. The simulated load of this invention can meet the simulation requirements of different types of turntables and loads, including adaptation to a single-axis turntable 12 and adaptation to a two-axis turntable. The two-axis turntable can be a U-shaped turntable 13, a T-shaped turntable 14, etc. In terms of adapting to different turntable structures, this invention exhibits good versatility. For a single-axis turntable 12 with a circular or square turntable mounting platform, such as... Figure 18 As shown, the support base 1 is directly installed using standardized T-bolts 11; the U-shaped turntable 13 can be installed according to different interface forms such as the two-sided T-slots 7 or the upper and lower T-slots 7 provided by the turntable mounting platform 6. By adjusting the number and installation position of the extension loads 17, various mounting modes such as single load in the middle, double load in the middle, single load on both sides, and double load on both sides can be flexibly achieved; while the T-shaped turntable 14 is mounted on the side, such as... Figure 24 and Figure 25 As shown, it is fully compatible with the single-load and dual-load mounting methods on both sides of the U-shaped turntable 13, using the same connection system. The specific mounting method of the U-shaped turntable 13 is as follows: Figures 19 to 23 As shown, there are four different mounting options, as shown below.

[0133] (1) Intermediate single load: such as Figure 19 and Figure 20 As shown, a turntable mounting platform 6 is set in the middle of the U-shaped turntable 13, and T-slots 7 are set on both sides of the turntable mounting platform 6. Two support seats 1 are respectively set by T-bolts 11. The support seats 1 are extended to carry horizontal axial and / or azimuth axial extension loads 17. The extension loads 17 of the two support seats 1 can be set in different directions or in the same direction to achieve rapid matching and reconstruction of load characteristics.

[0134] (2) Intermediate dual load: such as Figure 21 As shown, a turntable mounting platform 6 is set in the middle of the U-shaped turntable 13. T-slots 7 are set at the top and bottom of the turntable mounting platform 6. Two support seats 1 are set at the top and bottom respectively by T-bolts 11, and the corresponding extension loads 17 are extended as needed to realize the dual load arrangement.

[0135] (3) Single load on both sides: such as Figure 22 As shown, turntable mounting platforms 6 are respectively set on the two sides of the U-shaped turntable 13. T-slots 7 are provided on the outer side of the turntable mounting platforms 6 away from the two arms of the U-shaped turntable 13. Two support seats 1 are set on the two turntable mounting platforms 6 respectively by T-bolts 11. The corresponding extension loads 17 can be extended as needed to realize the side mounting of single load on both sides.

[0136] (4) Dual load on both sides: such as Figure 23As shown, turntable mounting platforms 6 are respectively provided on the two sides of the U-shaped turntable 13. T-slots 7 are provided on the upper and lower surfaces of the turntable mounting platforms 6 to support the vertical arrangement of single-sided dual loads.

[0137] Based on actual testing needs, the middle single load and middle dual load can be arbitrarily combined with the single loads on both sides or the dual loads on both sides to form a variety of load distribution modes, meeting the characteristic simulation needs under complex testing scenarios.

[0138] The design and installation process of the variable characteristic splicing simulated load applicable to different turntables is as follows:

[0139] First, based on the dynamic characteristics of the load required by the turntable, a suitable support base 1, as well as the quantity and length of the extension arm assembly and / or counterweight assembly 3, are selected according to the moment of inertia and natural frequency. The support base 1 is aligned with the T-slot 7 on the turntable mounting platform 6 through the T-bolt connection hole 9, and the two are connected and locked using T-bolts 11 and nuts 10. On this basis, the extension arm 24 can be quickly spliced. The extension arm 24 is quickly spliced ​​with the T-slot 7 on the support base 1 through the T-shaped boss 18, and fixed with L-shaped corner brackets 5 and screws 16. When multiple extension arms 24 need to be set, the T-shaped bosses 18 and T-slots 7 between adjacent extension arms 24 can be quickly spliced, and the torsional stiffness is enhanced by H-shaped corner brackets 4 and screws 16. Then, the counterweight is spliced. The T-shaped bosses 18 on the counterweight are quickly spliced ​​with the T-slots 7 of the extension arm 24, and fixed with L-shaped corner brackets 5 and screws 16.

[0140] To achieve precise adjustment of the simulated load characteristics, this embodiment provides a variety of adjustment methods:

[0141] (1) Regarding the structure of the support seat 1, different polygonal configurations such as quadrilaterals or hexagons can be selected according to the load characteristics requirements. Different mass distributions can be achieved by changing the load-bearing configuration. Each support seat 1 is equipped with a weight-reducing cavity 8 and an optimized reinforcing structure 15 to ensure torsional stiffness and reduce ineffective mass.

[0142] (2) In terms of mass adjustment, the two types of counterweights can be quickly spliced ​​by the cooperation of T-shaped boss 18 and T-shaped groove 7, and the countersunk through hole 21 of the first stacked counterweight 20 and the threaded hole 22 on the second stacked counterweight 23 are fixed by screws 16. The total mass can be continuously adjusted by alternately stacking different numbers of counterweights.

[0143] (3) In terms of center of mass adjustment, the axial position of the counterweight assembly 3 can be adjusted by changing the number and length of the extended arm 24 along the length direction, and by adjusting the number of counterweight blocks, the position of the system center of mass can be precisely controlled.

[0144] (4) In terms of torsional stiffness and natural frequency adjustment, H-shaped corner pieces 4 are provided on the H-shaped notch 19 of the extended arm assembly, or H-shaped corner pieces 4 are connected between the corresponding H-shaped notches 19 of adjacent extended arm assemblies, which can effectively adjust the torsional stiffness and natural frequency of the load system without changing the system mass.

[0145] In summary, this invention achieves dynamic and precise matching of core parameters such as the natural frequency, moment of inertia, mass, and center of mass of the simulated load through the flexible combination, arrangement, and parameter adjustment of the aforementioned modular components, providing an efficient and economical load simulation solution for testing different types of turntables.

Claims

1. A variable characteristic splicing analog load suitable for different turntables, characterized in that: Includes a support base (1) and at least one extended load (17) connecting the support base (1). The bottom surface of the support base (1) is connected to the turntable mounting platform (6) through the first connecting structure, and its side is connected to the extension load (17) through the second connecting structure. The extended load (17) includes an extended arm unit (2) and / or a counterweight assembly (3). The extended arm unit (2) includes at least one extended arm assembly, one end of which is connected to the support base (1) via a second connecting structure; the extended arm assembly includes at least one extended arm (24) along its length direction. The counterweight assembly (3) includes at least one counterweight block, which is connected to the support base (1) or to the other end of the extension arm assembly via a second connection structure.

2. The variable characteristic splicing simulated load applicable to different turntables according to claim 1, characterized in that: The extended arm (24) is provided with an H-shaped notch (19), and its side wall is provided with a natural frequency adjustment component corresponding to the H-shaped notch (19).

3. The variable characteristic splicing simulated load applicable to different turntables according to claim 2, characterized in that: The extended arm unit (2) includes at least two parallel extended arm assemblies; Two corresponding extension arms (24) in two adjacent extension arm assemblies share a common inherent frequency adjustment element; or, each extension arm (24) in each extension arm assembly is provided with a corresponding inherent frequency adjustment element.

4. The variable characteristic splicing simulated load applicable to different turntables according to claim 2 or 3, characterized in that: The second connection structure is set as a fitting structure, with the support base (1) and the extended arm (24) fitting together and being fixedly connected by an L-shaped corner piece (5); The counterweight near the extended arm (24) is connected to it through a second connecting structure and fixed with an L-shaped corner piece (5); The counterweight is provided in multiple ways, and adjacent counterweights are stacked together by a second connecting structure and fixed together by screws (16); The extended arm assembly includes multiple extended arms (24) along its length direction, adjacent extended arms (24) are connected by a second connection structure and fixed by connectors.

5. The variable characteristic splicing simulated load applicable to different turntables according to claim 4, characterized in that: The interlocking structure is a T-shaped interlocking structure; The inherent frequency adjustment component and the connecting component are both set as H-shaped corner pieces (4).

6. The variable characteristic splicing simulated load applicable to different turntables according to claim 5, characterized in that: The outer contour of the support base (1) is set as a regular polygon; The upper end face of the support base (1) is provided with a cavity along the central axis as a weight reduction cavity (8), and a reinforcing structure (15) is provided in the weight reduction cavity (8). The reinforcing structure (15) includes a support column arranged along the central axis and reinforcing ribs evenly distributed radially around the support column. One end of the reinforcing rib is connected to the support column, and the other end is connected to the side wall of the weight reduction cavity (8). The first connection structure includes a T-slot (7) on the turntable mounting platform (6), a T-bolt connection hole (9) on the bottom surface of the support base (1), a T-bolt (11) with the screw head in the T-slot (7) and the stud passing through the T-bolt connection hole (9), and a nut (10) for locking with the T-bolt (11).

7. A design method for a variable characteristic splicing simulated load applicable to different turntables, as described in claim 1, characterized in that, Includes the following steps: Step S1: Determine the dynamic characteristic requirements of the load required for the turntable; the dynamic characteristic requirements include moment of inertia, natural frequency, and torsional stiffness. Step S2: Select the support base (1) and the number and setting method of the extension load (17) according to the moment of inertia, natural frequency and torsional stiffness; In the extended load (17), the quantity, length, and mass of the extended arm assembly and / or counterweight assembly (3) satisfy the following relationship: ； in, To simulate the rotational inertia of the load, The moment of inertia of the support (1); Let m be the moment of inertia of the extension arm assembly, and m be the number of extension arm assemblies. Let n be the moment of inertia of the counterweight assembly (3), and n be the number of counterweight assemblies (3). Step S3: Adjust the quantity and setting method of the extended load (17) through simulation to meet the dynamic characteristic requirements.

8. The design method for variable characteristic splicing simulated loads applicable to different turntables according to claim 7, characterized in that: Step S2 further includes setting an inherent frequency adjustment element between adjacent extension arm assemblies according to the torsional stiffness of the extension arm assembly, so as to adjust the torsional stiffness of the extension arm unit (2).

9. The design method for variable characteristic splicing simulated loads applicable to different turntables according to claim 7, characterized in that: In step S2, the outer contour of the support base (1) is set as a regular quadrilateral, and the upper end face is provided with a weight reduction cavity (8) along the central axis. The weight reduction cavity (8) is cylindrical. Moment of inertia of support (1) Moment of inertia of the extended arm assembly Moment of inertia of the counterweight assembly (3) Calculated using the following formula: ； ； ； in, The mass of the solid body corresponding to the support (1); To reduce the mass of the solid cylinder corresponding to the weight reduction cavity (8), The radius of the weight reduction cavity (8) is... Let the side length of the support (1) be... To increase the weight of the extension arm assembly, To extend the distance between the central axis of the arm assembly and the perpendicular line from the center of its mounting surface, To extend the length of the arm assembly, For the mass of the counterweight component (3), The length of the counterweight component (3) along the length of the extended arm.

10. The design method for variable characteristic splicing simulated loads applicable to different turntables according to claim 8, characterized in that: In step S2, the natural frequency of the extended load (17) Satisfy the following formula: ； in, , , , , , These are the elements at the corresponding positions in the overall transfer matrix T of the extended arm unit.

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