Large cable net antenna molded surface active adjusting device and adjusting method

Abstract

The invention discloses a large-scale cable net antenna profile active adjusting device and adjusting method, the large-scale cable net antenna profile active adjusting device comprises an adjusting device body, the adjusting device body is hung on a large-scale cable net antenna longitudinal adjusting cable and a rear cable net, and the longitudinal adjusting cable is hung on a front cable net; the adjusting device body power mechanism penetrates through the rear cable net tensioning mechanism through a lead screw to be connected with the front cable net adjusting mechanism, and the information collecting and processing mechanism is located on the rear cable net tensioning mechanism. A plurality of cable sections of the rear cable net are connected to the rear cable net tensioning mechanism, the longitudinal adjusting cable is connected to a sliding block of the front cable net adjusting mechanism, the power mechanism drives a lead screw to rotate, the longitudinal adjusting cable moves along with the sliding block, the information collecting and processing mechanism obtains the cable force of the cable sections of the lower cable net, and the cable net profile is adjusted. A power mechanism is adopted as an actuator, a lead screw and sliding block structure is adopted for transmission, adjustment of the longitudinal cable of the antenna can be achieved while self-locking is conducted, and the device can achieve high-precision adjustment of the molded surface.

Description

Technical Field

[0001] The present invention belongs to the technical field of satellite communication equipment, and relates to an antenna profile adjustment device and method, and specifically to a large cable net antenna profile active adjustment device and method. Background Art

[0002] In recent years, aerospace science and technology has developed rapidly. The fields of long-distance microwave remote sensing, deep space exploration, military reconnaissance and communications have put forward higher and higher requirements for the gain and working frequency of antennas. Large aperture and high precision have become the main development direction of satellite antennas. When the antenna aperture and working frequency are certain, the reflector surface accuracy is the main factor affecting the antenna gain. It is usually required that the antenna gain loss is less than 0.3db, and the reflector surface accuracy is less than one-fiftieth of the working wavelength. The higher the antenna working frequency, the higher the surface accuracy requirement. In the space environment, due to the influence of microgravity, charged particle radiation, thermal cycle, micrometeoroids and space debris, the satellite antenna structure is prone to vibration and deformation, and the shape of the reflective surface is prone to deviation, making it difficult to obtain a high-precision surface. At the same time, the satellite antenna is affected by factors such as attitude adjustment, deployment pre-tension, material uncertainty and mechanical manufacturing and installation errors, which will also cause errors in the reflective surface. The surface accuracy of the reflector is the main factor affecting the electromagnetic performance of the antenna. Therefore, in order to meet the requirements of various aerospace missions, the satellite antenna structure must be actively adjusted to maintain the surface accuracy and meet the requirements of electrical performance.

[0003] At present, the shape adjustment methods of the peripheral truss cable net deployable antenna are mainly divided into passive adjustment and active adjustment. Passive adjustment is usually reduced as much as possible by optimizing structural design, improving processing technology, increasing structural stiffness and ground pre-compensation. Passive measures have the advantages of simple structure, easy implementation and no energy consumption, but require precise orbit thermal analysis technology and modeling technology. In addition, studies have shown that it is difficult to effectively eliminate the on-orbit error of the antenna reflector by relying solely on passive measures, and the accuracy and dimensional stability of the reflector cannot be guaranteed, which leads to a decrease in the gain of the antenna, especially for large-diameter antennas. The small structural damping and flexibility are more unfavorable to shape maintenance.

[0004] At present, the surface adjustment mechanisms include piezoelectric actuators, shape memory alloy actuators, magnetostrictive actuators and electromechanical actuators. Among them, piezoelectric actuators have high positioning accuracy and fast response speed, but small stroke, and need to be driven by high-voltage power supply, which is difficult to use in space environment. Shape memory alloy actuators have high positioning accuracy and large stroke, but are sensitive to temperature and have poor linearity. Magnetostrictive actuators have high energy density, but are easily affected by electromagnetic interference. Summary of the invention

[0005] In order to solve the above-mentioned defects existing in the prior art, the purpose of the present invention is to provide a device and method for actively adjusting the shape of a large peripheral truss cable net deployable antenna. The introduction of the active adjustment method can ensure the on-track shape accuracy of the antenna reflector and improve the overall performance indicators of the high-frequency antenna.

[0006] The objectives of the present invention are achieved through the following technical solutions.

[0007] In one aspect, the present invention provides a large-scale cable net antenna profile active adjustment device, comprising an adjustment device body, the adjustment device body is hung on the longitudinal adjustment cable of the large-scale cable net antenna and the rear cable net, and the longitudinal adjustment cable is hung on the front cable net;

[0008] The adjustment device body comprises a power mechanism, a rear cable net tensioning mechanism, an information collection and processing mechanism and a front cable net adjustment mechanism; the power mechanism is connected to the front cable net adjustment mechanism through a screw rod passing through the rear cable net tensioning mechanism, and the information collection and processing mechanism is located on the rear cable net tensioning mechanism;

[0009] Multiple cable segments of the rear cable net are connected to the rear cable net tensioning mechanism, and the longitudinal adjustment cable is connected to the slider of the front cable net adjustment mechanism. The screw rod is driven to rotate by the power mechanism, and the longitudinal adjustment cable moves with the slider. The information collection and processing mechanism obtains the cable force of the lower cable net segment to realize the adjustment of the cable net profile.

[0010] Preferably, the rear cable net tensioning mechanism includes a cover plate, an elastic plate, an upper bottom plate and a lower bottom plate. The lower bottom plate is located above the power mechanism. A functional plate of the information acquisition and processing mechanism is provided above the lower bottom plate. An upper bottom plate is provided above the functional board. A cover plate is connected above the upper bottom plate. A plurality of elastic plates extending downward are provided on the surface of the cover plate near the outer circumference.

[0011] Preferably, a through hole is provided in the center of the cover plate, and a plurality of cover plate grooves for passing the elastic plates are provided on the annular surface of the cover plate, and the elastic plates are arranged in an circumferential direction at equal intervals and coaxially along the center of the cover plate.

[0012] Preferably, the elastic plate is made of an elastomeric material, a strain gauge is adhered thereto, and elastic plate positioning holes and elastic plate hanging holes for connecting the rear cable net are opened at both ends of the elastic plate.

[0013] Preferably, the slider of the front cable net adjustment mechanism includes a baffle, a guide plate and a slider. A pair of guide plates are vertically arranged upward along both sides of the cover plate of the rear cable net tensioning mechanism. The screw rod of the power mechanism passes through the center of the cover plate and is connected to the baffle plate together with the pair of guide plates. A slider is slidably connected to the screw rod between the baffle plate and the cover plate.

[0014] Preferably, the baffle is a strip plate with rectangular grooves on both sides thereof, the rectangular grooves cooperate with the guide plates, and holes for passing the longitudinal adjustment cables are provided along the thickness direction of the baffle.

[0015] Preferably, multiple rope segments of the rear rope net pass through the rope holes of the elastic plate and are tightened; the longitudinal pull adjustment rope passes through the longitudinal adjustment rope through hole of the baffle, then bypasses the pull rope through hole of the slider and passes through the longitudinal adjustment rope through hole of the baffle to be tightened, forming an annular lock buckle.

[0016] Preferably, the functional board is composed of a printed circuit board, and the functional board is a single-layer or multi-layer functional board.

[0017] Another aspect of the present invention provides a method for adjusting the large cable net antenna profile active adjustment device, comprising:

[0018] Paste the strain gauge on the elastic plate of the rear cable net tensioning mechanism; fix the rear cable net tensioning mechanism on the power mechanism, start the motor, and move the slider along the screw rod to the middle position of the screw rod;

[0019] The assembled profile adjustment device is fixed vertically to the ground, and the rear cable net tensioning mechanism elastic plate hanging cable holes are inserted into the rear cable net cable segments in sequence; multiple groups of different tensions are applied to the cable segments in sections, and the output of the strain gauge is detected through the function board; the mapping relationship between the cable force and the output is obtained;

[0020] Pass the rear cable net section through the padlock hole of the elastic plate and fasten it, pass the longitudinal adjustment cable through the longitudinal adjustment cable through hole of the baffle and the cable through hole of the slider and fasten it;

[0021] The function board collects the output voltage of the cable segment in the actual prototype mesh through the strain gauge, and obtains the cable force of the rear cable segment through the calibrated cable force and voltage mapping relationship;

[0022] According to the cable force of the rear cable net segment, combined with the initial cable segment length and initial node position of the antenna, the cable net antenna finite element model is established to calculate the longitudinal cable adjustment amount. If the adjustment amount is a positive number, the motor rotates forward; the slider moves downward, and the node moves to the state where the front cable net is pulled downward; if the adjustment amount is a negative number, the motor rotates in the reverse direction; the slider moves upward, and the node moves to the state where the front cable net tends to be stretched horizontally, and the front cable net surface changes;

[0023] Check whether the surface accuracy of the cable net antenna meets the requirements. If the surface accuracy meets the requirements, end the surface adjustment; if not, repeat the above calculation of the longitudinal cable adjustment amount and the forward and reverse process of the motor until the surface accuracy requirements are met.

[0024] The present invention adopts the above technical solution, which has the following beneficial effects:

[0025] 1. The adjustment device body drives the rear cable net tensioning mechanism and the front cable net adjustment mechanism through the power mechanism motor to tension the rear cable net and the longitudinal adjustment cable, adjust the front cable net profile to change, and realize active precision adjustment of the antenna profile.

[0026] 2. The reflector shape active adjustment device uses the strain gauge on the elastic plate to obtain the cable force of the rear cable net section. According to the cable force information, the current state of the net surface can be calculated to guide the shape adjustment.

[0027] 3. The profile adjustment mechanism of the present invention is small in size, light in weight, can withstand high and low temperature differences, has a large adjustment stroke, and is very suitable for use in a space environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide a further understanding of the present invention, constitute a part of the present application, and do not constitute an improper limitation of the present invention. In the drawings:

[0029] Figure 1 It is a connection structure diagram of the profile adjustment device of the present invention;

[0030] Figure 2 This is the overall structural diagram of the profile adjustment device;

[0031] Figure 3 is a schematic diagram of the baffle;

[0032] Figure 4 is a schematic diagram of the guide plate;

[0033] Figure 5 It is a schematic diagram of a slider;

[0034] Figure 6 is a schematic diagram of the cover;

[0035] Figure 7 is a schematic diagram of an elastic plate;

[0036] Figure 8 Schematic diagram of the upper base plate;

[0037] Fig. 9 This is a schematic diagram of the function board;

[0038] Fig.10 is a schematic diagram of the lower base plate;

[0039] Fig.11 It is a schematic diagram of the power mechanism;

[0040] Fig.12 This is the structural diagram of the connection between the functional board and the lower base plate;

[0041] Fig.13 It is a structural diagram of the connection between the cover plate, the guide plate and the upper base plate;

[0042] Fig.14 Schematic diagram for increasing the number of layers of functional boards;

[0043] Figure 15 (a)-(c) is a schematic diagram of the adjustment principle;

[0044] Fig.16Flowchart for the adjustment method.

[0045] In the figure: 1. longitudinal adjustment rope; 2. profile adjustment device body; 3. rear rope net; 4. front rope net.

[0046] 2-1, baffle; 2-1-1, baffle through hole; 2-1-2, longitudinal adjustment cable through hole; 2-1-3, baffle threaded hole;

[0047] 2-2, guide plate; 2-2-1, guide plate fixing hole; 2-2-2, guide plate positioning hole; 2-2-3, guide plate main through hole;

[0048] 2-3, slider; 2-3-1, slider cable through hole; 2-3-2, slider threaded hole; 2-3-3, slider rectangular groove;

[0049] 2-4, cover plate; 2-4-1, annular boss; 2-4-2, cover plate groove; 2-4-3, cover plate threaded hole; 2-4-4, cover plate through hole; 2-4-5, cover plate fixing hole;

[0050] 2-5, elastic plate; 2-5-1, elastic plate positioning hole; 2-5-2, elastic plate hanging cable hole; 2-5-3, strain gauge;

[0051] 2-6, upper base plate; 2-6-1, threaded hole of upper base plate; 2-6-2, through hole of upper base plate; 2-6-3, fixing hole of upper base plate;

[0052] 2-7, function board; 2-7-1, function board positioning hole; 2-7-2; function board main through hole;

[0053] 2-8, lower bottom plate; 2-8-1, threaded hole of lower bottom plate; 2-8-2, fixing hole of lower bottom plate; 2-8-3 main through hole of lower bottom plate;

[0054] 2-9, power mechanism; 2-9-1, screw rod; 2-9-2, reducer; 2-9-3, stepper motor; 2-9-4, motor wire. DETAILED DESCRIPTION

[0055] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The exemplary embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0056] Please see attached Figure 1 A large cable net antenna profile active adjustment device includes a profile adjustment device body 2, the profile adjustment device body 2 is hung on the longitudinal adjustment cable 1 and the rear cable net 3 of the large cable net antenna, and the longitudinal adjustment cable 1 is hung on the front cable net 4.

[0057] Please see attached Figure 2The main body 2 of the profile adjustment device includes a power mechanism 2-9, a rear cable net tensioning mechanism, an information collection and processing mechanism and a front cable net adjustment mechanism; the power mechanism 2-9 passes through the rear cable net tensioning mechanism through a screw rod 2-9-1 to connect the front cable net adjustment mechanism, and the information collection and processing mechanism is located on the rear cable net tensioning mechanism.

[0058] The rear cable net tensioning mechanism includes a cover plate 2-4, an elastic plate 2-5, an upper bottom plate 2-6 and a lower bottom plate 2-8. The front cable net adjustment mechanism includes a baffle 2-1, a guide plate 2-2 and a slider 2-3. The information collection and processing mechanism includes a function board 2-7.

[0059] The lower base plate 2-8 of the rear cable net tensioning mechanism is located above the power mechanism 2-9, a plurality of functional plates 2-7 are arranged above the lower base plate 2-8, an upper base plate 2-6 is arranged above the functional plates 2-7, a cover plate 2-4 is connected above the upper base plate 2-6, a plurality of elastic plates 2-5 extending downward are arranged on the plate surface of the cover plate 2-4 close to the peripheral direction, the elastic plates 2-5 surround the upper base plate 2-6 and the functional plates 2-7 in a circular ring formed by their arc surfaces; the ends of the elastic plates 2-5 are used to connect the rear cable net 3.

[0060] A pair of guide plates 2-2 arranged vertically upward are provided on both sides of the cover plate 2-4 of the rear cable net tensioning mechanism. The screw rod 2-9-1 of the power mechanism 2-9 passes through the center of the cover plate 2-4 and is connected to the baffle plate 2-1 together with the pair of guide plates 2-2. A slider 2-3 is slidably connected to the screw rod 2-9-1 between the baffle plate 2-1 and the cover plate 2-4. The screw rod 2-9-1 of the power mechanism and the threaded hole 2-3-2 of the slider 2-3 are threadedly matched. When the motor screw rod rotates, the slider moves along the guide plate 2-2.

[0061] The following is the structure of each component Figure 3-11 Provide further details.

[0062] Baffle structure see Figure 3 As shown, the baffle 2-1 is a strip plate, and rectangular grooves are opened on both sides of the strip plate, and the rectangular grooves are matched with the guide plate 2-2; a threaded hole 2-1-3 is opened on the inner side of the rectangular groove along the length direction of the baffle 2-1, and the baffle threaded hole 2-1-3 and the guide plate fixing hole 2-2-1 are matched with screws to fix the baffle 2-1 and the guide plate 2-2 by screws. A baffle through hole 2-1-1 and a longitudinal adjustment cable through hole 2-1-2 are opened along the thickness direction of the baffle 2-1, and the baffle through hole 2-1-1 is used to match the clearance at the end of the motor screw rod, and the longitudinal adjustment cable through hole 2-1-2 is used to pass the longitudinal adjustment cable 2.

[0063] Guide plate 2-2 see Figure 4It is a U-shaped frame structure, and a guide plate fixing hole 2-2-1 is provided at the free end of the U-shaped frame for screw connection with the baffle threaded hole 2-1-3. A guide plate main through hole 2-2-3 and a guide plate positioning hole 2-2-2 are provided at the bottom of the U-shaped frame. The guide plate main through hole 2-2-3 is used for the screw rod 2-9-1 of the power mechanism 2-9 to pass through, and the guide plate positioning hole 2-2-2 is used to be fixed on the cover plate 2-4.

[0064] Slider structure see Figure 5 As shown, the slider 2-3 is a strip plate, and slider rectangular grooves 2-3-3 are opened on both sides of the strip plate, and the slider rectangular grooves are matched with the guide plate 2-2; a slider cable through hole 2-3-1 and a slider threaded hole 2-3-2 are opened in the thickness direction of the slider 2-3, the slider threaded hole 2-3-2 is used to cooperate with the screw thread of the power mechanism 2-9, and the slider cable through hole 2-3-1 is used to pass the longitudinal adjustment cable 2.

[0065] Cover plate structure Figure 6 As shown, a through hole is opened in the center of the cover plate 2-4 for the screw rod 2-9-1 of the power mechanism 2-9 to pass through, and fixing holes 2-4-5 are opened on both sides of the through hole for fixing the cover plate; a plurality of cover plate grooves 2-4-2 are opened on the annular surface of the cover plate 2-4, and a cover plate through hole 2-4-4 and a cover plate threaded hole 2-4-3 are opened on the two side surfaces of the cover plate 2-4 corresponding to the cover plate grooves 2-4-2. The cover plate through hole 2-4-4 and the cover plate threaded hole 2-4-3 are coaxial and are used to pass through the elastic plate 2-5 for fixing. The elastic plates are arranged coaxially and equidistantly along the center of the cover plate.

[0066] Elastic plate structure Figure 7 As shown, the elastic plate 2-5 is made of an elastic material, and a strain gauge 2-5-3 is pasted on it. An elastic plate positioning hole 2-5-1 and an elastic plate hanging cable hole 2-5-2 are provided at both ends of the elastic plate 2-5.

[0067] Upper base structure Figure 8 As shown, the upper base plate 2-6 is provided with an upper base plate main through hole 2-6-2 for passing the screw rod 2-9-1 of the power mechanism 2-9, and two upper base plate threaded holes 2-6-1 and two upper base plate fixing holes 2-6-3 are provided on both sides of the main through hole. The upper base plate fixing holes 2-6-3 are connected to the lower bolts by screws, and the upper base plate threaded holes 2-6-1 are connected to the upper guide plate by screws. The connection structure of the cover plate 2-4, the guide plate 2-2 and the upper base plate 2-6 is shown in FIG. Fig.13 shown.

[0068] Function board structure see Fig. 9As shown, the function board 2-7 has a main through hole 2-7-2 and three positioning holes 2-7-1. The positioning holes 2-7-1 are evenly distributed around the main through hole 2-7-2. The main through hole is used to pass the screw 2-9-1 of the power mechanism, and the positioning holes are supported and fixed by bolts. The function board 2-7 is composed of a printed circuit board to realize the strain signal collection function. When the area of ​​one layer of function board 2-7 is not enough, multiple layers of function boards can be added. Fig.14 shown.

[0069] The structure of the lower floor is shown in Fig.10 As shown, the lower bottom plate 2-8 is provided with a lower bottom plate main through hole 2-8-3 for passing the screw rod 2-9-1 of the power mechanism, and bottom plate fixing holes 2-8-2 are provided on both sides of the main through hole for fixing the lower bottom plate and the power mechanism function board, see Fig.12 The main through hole is surrounded by threaded holes 2-8-1 on the bottom plate for fixing the upper functional plate with bolts.

[0070] The functional plate 2-7 and the lower base plate 2-8 are matched with bolts, and the lower base plate 2-8 and the power mechanism 2-9 are matched with screws.

[0071] Power mechanism Fig.14 As shown, the power mechanism 2-9 includes a screw 2-9-1, a reducer 2-9-2, a stepper motor 2-9-3 and a motor lead 2-9-4. The screw-slider structure composed of the screw 2-9-1 and the slider 2-3 can be self-locking; the reducer 2-9-2 is provided with a threaded hole for fixing the lower base plate.

[0072] The working principle of the device is to pass multiple cable segments of the rear cable net 3 through the elastic plate hanging cable hole 2-5-2 and tighten them, pass the longitudinal adjustment cable 1 through the longitudinal adjustment cable through hole 2-1-2 of the baffle 2-1, and then bypass the cable through hole 2-3-1 of the slider and pass it out from the longitudinal adjustment cable through hole 2-1-2 of the baffle 2-1 and tighten it to form a ring-shaped lock buckle.

[0073] At the initial moment, as shown in Figure 15(b), the slider is located in the middle of the guide plate, and the upper cable net node is at position A; when the node needs to be adjusted downward, the stepper motor rotates, and the output to the reducer also starts to rotate, thereby driving the lead screw to rotate, the slider starts to move downward, and the upper cable net node moves to A′, as shown in Figure 15(a); when the node needs to be adjusted upward, the stepper motor rotates in the other direction, the output reducer also rotates in the other direction, the lead screw rotates in the other direction, the slider starts to move upward, and the upper cable net node moves to A″, as shown in Figure 15(c). By controlling the direction of the motor, the cable net surface can be adjusted.

[0074] The present invention further provides a method for actively adjusting the profile of a large cable net antenna. Fig.16As shown, the following steps are included:

[0075] Step 1: Adjust the mechanism assembly.

[0076] Paste the strain gauge on the elastic plate 2-5 of the rear cable net tensioning mechanism, fix the elastic plate on the cover plate 2-4 through the positioning hole 2-5-1, and fix the cover plate 2-4 and the guide plate 2-2 on the upper base plate 2-6 through the cover plate fixing hole 2-4-5 and the guide plate positioning hole 2-2-2. Use flat head screws and bolts to fix the upper base plate 2-6 to the function plate 2-7, use bolts to fix the function plate 2-7 to the lower base plate 2-8, and use flat head screws to fix the lower base plate to the power mechanism 2-9. Keep the slider threaded hole 2-3-2 and the screw rod 2-9-1 coaxial; start the motor and move the slider 2-3 along the screw rod 2-9-1 to the middle position of the screw rod; finally, use screws to connect the guide plate fixing hole 2-2-1 and the baffle threaded hole 2-1-3 to connect the baffle 2-1 with the guide plate 2-2.

[0077] Step 2: Calibration of strain gauges.

[0078] Fix the assembled adjustment device body vertically to the ground, and insert the rear cable net cable segments into the rear cable net tensioning mechanism elastic plate hanging cable holes 2-5-2 in sequence; apply multiple groups of different pulling forces to the cable segments in sections, detect the output voltage of the strain gauge through the function board, form a mapping relationship between cable force and output voltage, and then remove the experimental cable segments.

[0079] The mapping relationship between cable force and output is as follows:

[0080]

[0081] F=EεA

[0082]

[0083] Where, e is the output voltage of the strain gauge, K is the strain rate, ε is the strain generated by the strain gauge, V is the power supply voltage, F is the cable force of the lower cable net segment, A is the cross-sectional area of ​​the strain gauge resistor, and E is the elastic modulus.

[0084] Step 3, adjust the installation of the mechanism.

[0085] Pass the rear cable net 3 section through the elastic plate padlock hole 2-5-2 and fasten it, and pass the longitudinal cable 1 through the longitudinal adjustment cable through hole 2-1-2 of the baffle and the cable through hole 2-3-1 of the slider and fasten it around.

[0086] Step 4: Cable force data collection.

[0087] The output voltage of the cable segment in the actual prototype mesh is collected through the strain gauge 2-5-3 on the function board 2-7, and the cable force F of the lower cable mesh segment is inferred through the calibrated cable force and voltage mapping relationship.

[0088] Step 5: Determine the motor direction and angle.

[0089] According to the collected cable force data combined with the initial cable segment length and initial node position of the antenna, the finite element model of the cable net antenna is established using the finite element method, and the adjustment amount of the longitudinal cable is calculated using quadratic programming, see Figure 15(a). If the adjustment amount is a positive number, the motor rotates forward. If the adjustment amount is a negative number, the motor rotates reversely. The rotation angle of the motor is determined according to the adjustment amount value.

[0090] Step 6, the stepper motor starts to rotate, see Figure 15(a). If the motor rotates forward, the lead screw rotates forward, the slider moves down, and the node moves to A′. If the motor rotates reversely, the lead screw rotates reversely, the slider moves up, and the node moves to A″, see Figure 15(c). When the stepper motor stops moving, the front cable net surface changes.

[0091] Step 7, check whether the surface accuracy of the cable net antenna meets the requirements. If the surface accuracy meets the requirements, end the surface adjustment; if not, repeat steps 5 to 7 until the surface accuracy requirements are met.

[0092] The present invention is aimed at large-caliber antennas and can solve the problems of small structural damping, flexibility that is more unfavorable to shape maintenance, small stroke, temperature sensitivity, poor linearity, and susceptibility to electromagnetic interference. The surface of the satellite-borne antenna structure is actively adjusted to maintain the surface accuracy and meet the requirements of electrical performance. The adjustment method of the present invention obtains the state information of the mesh node by using strain gauges to detect the cable force, guides the surface adjustment, and avoids the problem of incomplete shooting area of ​​the photogrammetry method.

[0093] The present invention is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed in the present invention, technicians in this field can make some substitutions and deformations to some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present invention.

Claims

1. A large-scale cable net antenna profile active adjustment device, characterized in that: It comprises an adjustment device body, the adjustment device body is hung on the longitudinal adjustment cable of the large cable net antenna and the rear cable net, and the longitudinal adjustment cable is hung on the front cable net; The adjustment device body comprises a power mechanism, a rear cable net tensioning mechanism, an information collection and processing mechanism and a front cable net adjustment mechanism; the power mechanism is connected to the front cable net adjustment mechanism through a screw rod passing through the rear cable net tensioning mechanism, and the information collection and processing mechanism is located on the rear cable net tensioning mechanism; Multiple cable segments of the rear cable net are connected to the rear cable net tensioning mechanism, and the longitudinal adjustment cable is connected to the slider of the front cable net adjustment mechanism. The screw rod is driven to rotate by the power mechanism, and the longitudinal adjustment cable moves with the slider. The information collection and processing mechanism obtains the cable force of the lower cable net segment to realize the adjustment of the cable net profile.

2. The large cable net antenna profile active adjustment device according to claim 1, characterized in that: The rear cable net tensioning mechanism includes a cover plate, an elastic plate, an upper bottom plate and a lower bottom plate. The lower bottom plate is located above the power mechanism. A functional plate of the information acquisition and processing mechanism is provided above the lower bottom plate. An upper bottom plate is provided above the functional board. A cover plate is connected above the upper bottom plate. A plurality of elastic plates extending downward are provided on the surface of the cover plate near the outer circumference.

3. The large cable net antenna profile active adjustment device according to claim 2, characterized in that: A through hole is provided in the center of the cover plate, and a plurality of cover plate grooves for passing the elastic plates are provided on the annular surface of the cover plate. The elastic plates are arranged in an axial direction at equal intervals along the center of the cover plate.

4. The large cable net antenna profile active adjustment device according to claim 2, characterized in that: The elastic plate is made of an elastic material, on which a strain gauge is pasted, and elastic plate positioning holes and elastic plate hanging cable holes for connecting the rear cable net are opened at both ends of the elastic plate.

5. The large cable net antenna profile active adjustment device according to claim 1, characterized in that: The front cable net adjustment mechanism includes a baffle, a guide plate and a slider. A pair of guide plates are arranged vertically upward along both sides of the cover plate of the rear cable net tensioning mechanism. The screw rod of the power mechanism passes through the center of the cover plate and is connected to the baffle plate together with the pair of guide plates. A slider is slidably connected to the screw rod between the baffle plate and the cover plate.

6. The large cable net antenna profile active adjustment device according to claim 5, characterized in that: The baffle is a strip plate with rectangular grooves on both sides thereof, the rectangular grooves are matched with the guide plates, and holes for passing longitudinal adjustment cables are opened along the thickness direction of the baffle.

7. The large cable net antenna profile active adjustment device according to claim 6, characterized in that: Multiple cable sections of the rear cable net pass through the cable holes of the elastic plate and are fastened; the longitudinal adjustment cable passes through the longitudinal adjustment cable hole of the baffle, then bypasses the cable hole of the slider and passes through the longitudinal adjustment cable hole of the baffle to be fastened, forming an annular lock buckle.

8. The large cable net antenna profile active adjustment device according to claim 1, characterized in that: The functional board is composed of a printed circuit board, and the functional board is a single-layer or multi-layer functional board.

9. A method for adjusting the large cable net antenna profile active adjustment device according to any one of claims 1 to 8, characterized in that: include: Paste the strain gauge on the elastic plate of the rear cable net tensioning mechanism; fix the rear cable net tensioning mechanism on the power mechanism, start the motor, and move the slider along the screw rod to the middle position of the screw rod; The assembled profile adjustment device is fixed vertically to the ground, and the rear cable net tensioning mechanism elastic plate hanging cable holes are inserted into the rear cable net cable segments in sequence; multiple groups of different tensions are applied to the cable segments in sections, and the output of the strain gauge is detected through the function board; the mapping relationship between the cable force and the output is obtained; Pass the rear cable net section through the padlock hole of the elastic plate and fasten it, pass the longitudinal adjustment cable through the longitudinal adjustment cable through hole of the baffle and the cable through hole of the slider and fasten it; The function board collects the output voltage of the cable segment in the actual prototype mesh through the strain gauge, and obtains the cable force of the rear cable segment through the calibrated cable force and voltage mapping relationship; According to the cable force of the rear cable net segment, combined with the initial cable segment length and initial node position of the antenna, the cable net antenna finite element model is established to calculate the longitudinal cable adjustment amount. If the adjustment amount is a positive number, the motor rotates forward; the slider moves downward, and the node moves to the state where the front cable net is pulled downward; if the adjustment amount is a negative number, the motor rotates in the reverse direction; the slider moves upward, and the node moves to the state where the front cable net tends to be horizontally stretched, and the front cable net surface changes; Check whether the surface accuracy of the cable net antenna meets the requirements. If the surface accuracy meets the requirements, end the surface adjustment; if not, repeat the above calculation of the longitudinal cable adjustment amount and the forward and reverse process of the motor until the surface accuracy requirements are met.

10. The method for actively adjusting the profile of a large cable net antenna according to claim 8, characterized in that: The mapping relationship between cable force and output is as follows: F=EεA Where, e is the output voltage of the strain gauge, K is the strain rate, ε is the strain generated by the strain gauge, V is the power supply voltage, F is the cable force of the lower cable net segment, A is the cross-sectional area of ​​the strain gauge resistor, and E is the elastic modulus.

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