A large-scale cable net antenna profile active adjustment device and adjustment method

Abstract

The application discloses a large-scale cable net antenna profile active adjusting device and adjusting method, which comprises an adjusting device body, the adjusting device body is hung on a longitudinal adjusting cable and a rear cable net of a large-scale cable net antenna, and the longitudinal adjusting cable is hung on a front cable net; a power mechanism of the adjusting device body is connected with a front cable net adjusting mechanism through a lead screw passing through a rear cable net tensioning mechanism, and an information acquisition and processing mechanism is located on the rear cable net tensioning mechanism; a plurality of cable segments of the rear cable net are connected on the rear cable net tensioning mechanism, the longitudinal adjusting cable is connected on a sliding block of the front cable net adjusting mechanism, the lead screw is driven to rotate through the power mechanism, the longitudinal adjusting cable moves along with the sliding block, the information acquisition and processing mechanism acquires the cable force of the lower cable net cable segment, and the adjustment of the cable net profile is realized. The power mechanism is used as an actuator, the lead screw and sliding block structure are used for transmission, the adjustment of the antenna longitudinal cable can be realized while self-locking, and the device can realize high-precision profile adjustment.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of satellite communication equipment, and relates to an antenna profile adjusting device and method, in particular to a large-scale cable net antenna profile active adjusting device and adjusting method. BACKGROUND

[0002] In recent years, with the rapid development of aerospace technology, the gain and operating frequency of antennas in the fields of long-distance microwave remote sensing, deep space exploration, military reconnaissance and communication are increasingly required, and large aperture and high precision have become the main development direction of spaceborne antennas. When the aperture and operating frequency of the antenna are certain, the reflector profile precision is the main factor affecting the gain of the antenna, and the antenna gain loss is usually required to be less than 0.3db, and the reflector profile precision is required to be less than one-fiftieth of the operating wavelength. The higher the operating frequency of the antenna, the higher the requirement for the profile precision. In the space environment, due to the influence of microgravity, charged particle radiation, thermal cycle, micro-meteoroids and space debris, the spaceborne antenna structure is easy to vibrate and deform, and the reflector profile is easy to deviate, so it is difficult to obtain a high-precision profile. At the same time, the spaceborne antenna is affected by factors such as attitude adjustment, deployment pre-tension, material uncertainty and mechanical manufacturing and installation errors, which also causes errors in the reflector profile. The profile precision of the reflector is the main factor affecting the electromagnetic performance of the antenna, so in order to meet the requirements of various aerospace tasks, the profile of the spaceborne antenna structure must be actively adjusted to maintain the profile precision and meet the requirements of the electrical performance.

[0003] At present, the profile adjusting method of the peripheral truss type cable net deployable antenna mainly includes passive adjustment and active adjustment. Passive adjustment usually adopts passive measures such as optimizing structure design, improving processing technology, increasing structural stiffness and ground pre-compensation to reduce as much as possible. Passive measures have the advantages of simple structure, easy implementation and no energy consumption, but require accurate orbit thermal analysis technology and modeling technology. In addition, studies have shown that it is difficult to effectively eliminate the on-orbit errors of the antenna reflector by relying only on passive measures, and it is difficult to guarantee the precision and dimensional stability of the reflector, thereby causing the gain of the antenna to decrease, especially for large-aperture antennas, the small structural damping and the tendency to flexibility are more unfavorable to the profile maintenance.

[0004] At present, the profile adjusting mechanism includes piezoelectric actuators, shape memory alloy actuators, magnetostrictive actuators and electromechanical actuators. Among them, the piezoelectric actuator has high positioning accuracy and fast response speed, but has small stroke and needs to use high-voltage power supply for driving, which is difficult to use in space environment. The shape memory alloy actuator has high positioning accuracy and large stroke, but is sensitive to temperature and has poor linearity. The magnetostrictive actuator has high energy density, but is easy to be affected by electromagnetic interference. SUMMARY

[0005] In order to solve the above-mentioned defects existing in the prior art, the present application aims to provide a large-scale peripheral truss type cable net deployable antenna profile active adjustment device and method, which introduces an active adjustment method and can ensure the on-orbit profile accuracy of the antenna reflector and improve the overall performance index of the high-frequency antenna.

[0006] The object of the present application is achieved by the following technical solutions.

[0007] According to an aspect of the present application, a large-scale cable net antenna profile active adjustment device is provided, which comprises an adjustment device body, the adjustment device body is hung on a large-scale cable net antenna longitudinal adjustment cable and a rear cable net, the longitudinal adjustment cable is hung on a front cable net;

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

[0009] A plurality of cable segments of the rear cable net are connected to the rear cable net tensioning mechanism, the longitudinal adjustment cable is connected to a slider of the front cable net adjustment mechanism, the lead screw is driven to rotate by the power mechanism, the longitudinal adjustment cable moves with the slider, the information acquisition and processing mechanism acquires the cable force of the lower cable net cable segment, and the adjustment of the cable net profile is realized.

[0010] Preferably, the rear cable net tensioning mechanism comprises 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 arranged above the lower bottom plate, an upper bottom plate is arranged above the functional plate, and the cover plate is connected above the upper bottom plate; a plurality of elastic plates extending downward are arranged on the surface of the cover plate close to the outer circumferential direction.

[0011] Preferably, a through hole is formed in the center of the cover plate, a plurality of cover plate grooves for penetrating the elastic plates are formed on the cover plate ring surface, and the elastic plates are arranged in a coaxial ring along the center of the cover plate at equal intervals.

[0012] Preferably, the elastic plates are made of an elastic body material, strain gauges are attached to the surfaces of the elastic plates, elastic plate positioning holes and elastic plate cable connection holes for connecting the rear cable net are formed at both ends of the elastic plates.

[0013] Preferably, the slider of the front cable net adjustment mechanism comprises a baffle plate, 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 lead screw of the power mechanism penetrates through the center of the cover plate and is connected to the baffle plate together with the pair of guide plates, and the slider is slidably connected to the lead screw between the baffle plate and the cover plate.

[0014] Preferably, the baffle plate is a strip-shaped plate, a rectangular groove is formed on both sides of the strip-shaped plate, the rectangular groove is matched with the guide plate, and a through hole for penetrating the longitudinal adjustment cable is formed along the thickness direction of the baffle plate.

[0015] As preferred, the plurality of cable segments of the rear cable net pass through the elastic plate cable hole and are tied; the longitudinal tension adjusting cable passes through the longitudinal adjusting cable through hole of the baffle, and then passes through the cable through hole of the slider and is tied to form a ring-shaped lock.

[0016] As preferred, the functional plate is composed of a printed circuit board, and the functional plate is one or more layers of functional plates.

[0017] In another aspect of the present application, a method for adjusting the large-scale cable net antenna profile active adjustment device is provided, which comprises:

[0018] The strain gauges are pasted on the elastic plate of the rear cable net tensioning mechanism; the rear cable net tensioning mechanism is fixed on the power mechanism, and the motor is started to move the slider to the middle position of the screw rod;

[0019] The assembled profile adjustment device is fixed vertically to the ground, and the cable segments of the rear cable net are sequentially passed through the cable hole of the elastic plate of the rear cable net tensioning mechanism; a plurality of groups of different sizes of tension are applied to the cable segments in sections, and the output of the strain gauges is detected by the functional plate; and the mapping relationship between the cable force and the output is obtained.

[0020] The cable segments of the rear cable net pass through the elastic plate cable hole and are tied, and the longitudinal adjusting cable passes through the longitudinal adjusting cable through hole of the baffle and the cable through hole of the slider and is tied.

[0021] The functional plate collects the output voltage of the cable segments in the actual prototype net surface through the strain gauges, and obtains the cable force of the cable segments of the rear cable net through the calibrated mapping relationship between the cable force and the voltage.

[0022] According to the cable force of the cable segments of the rear cable net, the initial cable segment length and the initial node position of the antenna are combined to establish a finite element model of the cable net antenna, and the longitudinal cable adjusting amount is calculated; if the adjusting amount is positive, the motor is forward rotated; the slider is moved downward, and the node is moved to the downward tension state of the front cable net; if the adjusting amount is negative, the motor is reversely rotated; the slider is moved upward, and the node is moved to the flat tension state of the front cable net, and the profile of the front cable net changes.

[0023] Whether the profile accuracy of the cable net antenna meets the requirements is detected, and if the profile accuracy meets the requirements, the profile adjustment is ended; if not, the above calculation of the longitudinal cable adjusting amount and the forward and reverse rotation of the motor are repeated until the profile accuracy requirements are met.

[0024] The present application has the following beneficial effects due to the above technical solutions:

[0025] 1. The adjustment device body drives the rear cable net tensioning mechanism and the front cable net adjusting mechanism through the motor of the power mechanism to tension the rear cable net and the longitudinal adjusting cable, changes the profile of the front cable net, and realizes active profile accuracy adjustment of the antenna.

[0026] 2. The reflector surface active adjustment device uses the strain gauge on the elastic plate to obtain the cable force of the cable segment of the cable net, and according to the cable force information, the current state of the net surface can be calculated, thereby guiding the surface adjustment.

[0027] 3. The surface adjustment mechanism of the present application has small volume, light weight, can resist high and low temperature difference, has large adjustment stroke, and is very suitable for use in space environment. BRIEF DESCRIPTION OF DRAWINGS

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

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

[0030] Figure 2 It is a whole structure diagram of the surface adjustment device;

[0031] Figure 3 It is a baffle diagram;

[0032] Figure 4 It is a guide plate diagram;

[0033] Figure 5 It is a slider diagram;

[0034] Figure 6 It is a cover plate diagram;

[0035] Figure 7 It is an elastic plate diagram;

[0036] Figure 8 It is an upper bottom plate diagram;

[0037] Figure 9 It is a functional plate diagram;

[0038] Figure 10 It is a lower bottom plate diagram;

[0039] Figure 11 It is a power mechanism diagram;

[0040] Figure 12 It is a connection structure diagram of the functional plate and the lower bottom plate;

[0041] Figure 13 It is a connection structure diagram of the cover plate, the guide plate and the upper bottom plate;

[0042] Figure 14 It is a diagram for increasing the number of layers of the functional plate;

[0043] Fig. 15 (a)-(c) is an adjustment principle diagram;

[0044] Figure 16To adjust the method flow chart.

[0045] Figure: 1, longitudinal adjustment cable; 2, profile adjustment device body; 3, rear cable net; 4, front cable 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 bottom plate; 2-6-1, upper bottom plate threaded hole; 2-6-2, upper bottom plate through hole; 2-6-3, upper bottom plate fixing hole;

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

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

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

[0055] The present application will be described in detail below with reference to the accompanying drawings and specific embodiments, which are used to explain the present application, but not as a limitation of the present application.

[0056] Please refer to the accompanying drawings Figure 1 A large cable net antenna profile active adjustment device, comprising a profile adjustment device body 2, the profile adjustment device body 2 is hung on the large cable net antenna longitudinal adjustment cable 1 and the rear cable net 3, the longitudinal adjustment cable 1 is hung on the front cable net 4.

[0057] Please refer to the accompanying drawings Figure 2The profile adjusting device body 2 comprises a power mechanism 2-9, a rear cable net tensioning mechanism, an information acquisition processing mechanism and a front cable net adjusting mechanism; the power mechanism 2-9 is connected to the front cable net adjusting mechanism through a lead screw 2-9-1 penetrating through the rear cable net tensioning mechanism, and the information acquisition processing mechanism is located on the rear cable net tensioning mechanism.

[0058] The rear cable net tensioning mechanism comprises 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 adjusting mechanism comprises a baffle plate 2-1, a guide plate 2-2 and a sliding block 2-3. The information acquisition processing mechanism comprises a functional plate 2-7.

[0059] The lower bottom 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 bottom plate 2-8, an upper bottom plate 2-6 is arranged above the functional plates 2-7, the cover plate 2-4 is connected above the upper bottom plate 2-6, a plurality of downwardly extending elastic plates 2-5 are arranged on the plate surface of the cover plate 2-4 close to the outer circumferential direction, and the elastic plates 2-5 enclose the upper bottom plate 2-6 and the functional plates 2-7 in the circular ring formed by the arc surface. The end portion of the elastic plate 2-5 is used for connecting the rear cable net 3.

[0060] A pair of upwardly and vertically arranged guide plates 2-2 are arranged on both sides of the cover plate 2-4 of the rear cable net tensioning mechanism, the lead screw 2-9-1 of the power mechanism 2-9 penetrates through the center of the cover plate 2-4 and is connected to the pair of guide plates 2-2 to jointly connect the baffle plate 2-1, and the sliding block 2-3 is slidingly connected on the lead screw 2-9-1 between the baffle plate 2-1 and the cover plate 2-4. The threaded hole 2-3-2 of the lead screw 2-9-1 and the sliding block 2-3 of the power mechanism are threadedly connected, and when the motor lead screw rotates, the sliding block moves along the guide plate 2-2.

[0061] The structures of the components are further described below. Figures 3-11

[0062] The structure of the baffle plate is shown in Figure 3 The baffle plate 2-1 is a strip-shaped plate, a rectangular slot is opened on both sides of the strip-shaped plate, the rectangular slot is matched with the guide plate 2-2, a threaded hole 2-1-3 is opened on the inner side of the rectangular slot along the length direction of the baffle plate 2-1, the baffle plate threaded hole 2-1-3 and the guide plate fixed hole 2-2-1 are threadedly connected, and the baffle plate 2-1 is fixed to the guide plate 2-2 through the screw. A baffle plate through hole 2-1-1 and a longitudinal adjusting cable through hole 2-1-2 are opened along the thickness direction of the baffle plate 2-1, the baffle plate through hole 2-1-1 is matched with the gap of the end of the motor lead screw, and the longitudinal adjusting cable through hole 2-1-2 is used for penetrating through the longitudinal adjusting cable 2.

[0063] The guide plate 2-2 is shown in Figure 4 ​As shown, the U-shaped frame structure is provided with a guide plate fixing hole 2-2-1 at the free end of the U-shaped frame, which is used in cooperation with the baffle screw hole 2-1-3 to connect with a screw, and the bottom of the U-shaped frame is provided with a guide plate main through hole 2-2-3 and a guide plate positioning hole 2-2-2, the guide plate main through hole 2-2-3 is used for the lead screw 2-9-1 of the power mechanism 2-9 to pass through, and the guide plate positioning hole 2-2-2 is used for fixing on the cover plate 2-4.

[0064] The slider structure is shown in Figure 5 As shown, the slider 2-3 is a strip-shaped plate, and slider rectangular grooves 2-3-3 are opened on both sides of the strip-shaped plate, which are matched with the guide plate 2-2; slider cable through holes 2-3-1 and slider screw holes 2-3-2 are opened in the thickness direction of the slider 2-3, the slider screw holes 2-3-2 are used for cooperation with the lead screw thread of the power mechanism 2-9, and the slider cable through holes 2-3-1 are used for passing through the longitudinal adjusting cable 2.

[0065] The cover plate structure is shown in Figure 6 As shown, the cover plate 2-4 is provided with a through hole in the center, which is used for the lead screw 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, which are used for fixing the cover plate; a plurality of cover plate grooves 2-4-2 are opened on the ring surface of the cover plate 2-4, cover plate through holes 2-4-4 and cover plate screw holes 2-4-3 are opened on both sides of the cover plate 2-4 corresponding to the cover plate grooves 2-4-2, the cover plate through holes 2-4-4 and the cover plate screw holes 2-4-3 are coaxial and used for passing through the elastic plate 2-5 to be fixed. Each elastic plate is arranged in a ring shape along the coaxial center of the cover plate.

[0066] The elastic plate structure is shown in Figure 7 As shown, the elastic plate 2-5 is made of an elastic material, and a strain gauge 2-5-3 is attached to the top surface. Elastic plate positioning holes 2-5-1 and elastic plate cable holes 2-5-2 are opened at both ends of the elastic plate 2-5.

[0067] The upper bottom plate structure is shown in Figure 8 As shown, the upper bottom plate 2-6 is provided with an upper bottom plate main through hole 2-6-2, which is used for the lead screw 2-9-1 of the power mechanism 2-9 to pass through, and two upper bottom plate screw holes 2-6-1 and two upper bottom plate fixing holes 2-6-3 are opened on both sides of the main through hole. The upper bottom plate fixing hole 2-6-3 is connected with the lower bolt by a screw, and the upper bottom plate screw hole 2-6-1 is connected with the upper guide plate by a screw. The connection structure of the cover plate 2-4, the guide plate 2-2 and the upper bottom plate 2-6 is shown in Figure 13 As shown.

[0068] The function plate structure is shown in Figure 9As shown, the functional plate 2-7 is provided with a functional plate main through hole 2-7-2 and three functional plate positioning holes 2-7-1, which are evenly distributed around the functional plate main through hole 2-7-2. The functional plate main through hole is used for passing the lead screw 2-9-1 of the power mechanism, and the functional plate positioning hole is used for passing the bolt support and fixation. The functional plate 2-7 is composed of a printed circuit board, and realizes the strain signal acquisition function. When the area of one layer of functional plate 2-7 is not enough, multiple layers of functional plates can be added, as shown in Figure 14

[0069] The lower bottom plate structure is shown in Figure 10 As shown, the lower bottom plate 2-8 is provided with a lower bottom plate main through hole 2-8-3, which is used for passing the lead screw 2-9-1 of the power mechanism, and the lower bottom plate is provided with a bottom plate fixation hole 2-8-2 on both sides of the main through hole, which is used for fixing the lower bottom plate and the functional plate of the power mechanism, as shown in Figure 12 The main through hole is provided with a lower bottom plate threaded hole 2-8-1 around the main through hole, which is used for fixing the upper layer of functional plate by using a bolt.

[0070] The functional plate 2-7 and the lower bottom plate 2-8 are matched by using a bolt, and the lower bottom plate 2-8 and the power mechanism 2-9 are matched by using a screw.

[0071] The power mechanism is shown in Figure 14 As shown, the power mechanism 2-9 includes a lead screw 2-9-1, a speed reducer 2-9-2, a stepping motor 2-9-3 and motor wires 2-9-4. The lead screw 2-9-1 and the sliding block 2-3 constitute a self-locking lead screw and sliding block structure; the speed reducer 2-9-2 is provided with a threaded hole for fixing the lower bottom plate.

[0072] The working principle of the device is that the multiple cable segments of the rear cable net 3 are passed through the elastic plate hanging cable hole 2-5-2 and tied, the longitudinal adjustment cable 1 is passed through the longitudinal adjustment cable through hole 2-1-2 of the baffle 2-1, then passed through the cable through hole 2-3-1 of the sliding block from the longitudinal adjustment cable through hole 2-1-2 of the baffle 2-1 and tied, and a ring-shaped lock is formed.

[0073] At the initial moment, as shown in Fig. 15(b), the sliding block is located at the middle position of the guide plate, and the upper cable net surface node is at position A; when the node needs to be adjusted downward, the stepping motor rotates, the output of the speed reducer also starts to rotate, and then drives the lead screw to rotate, and the sliding block starts to move downward, and the upper cable net node moves to A', as shown in Fig. 15(a); when the node needs to be adjusted upward, the stepping motor rotates in the other direction, the output of the speed reducer also rotates in the other direction, the lead screw rotates in the other direction, and the sliding block starts to move upward, and the upper cable net node moves to A'', as shown in Fig. 15(c). By controlling the rotation direction of the motor, the adjustment of the cable net surface can be realized.

[0074] The application further provides a large-scale cable net antenna surface active adjustment method, as shown in Figure 16 ​As shown, comprising the following steps:

[0075] Step 1, adjustment mechanism assembly.

[0076] The strain gauge is pasted on the elastic plate 2-5 of the rear cable net tensioning mechanism, the elastic plate is fixed on the cover plate 2-4 through the positioning hole 2-5-1, the cover plate 2-4 and the guide plate 2-2 are fixed on the upper bottom plate 2-6 through the cover plate fixing hole 2-4-5 and the guide plate positioning hole 2-2-2, the upper bottom plate 2-6 is fixed on the function plate 2-7 using flat head screws and bolts, the function plate 2-7 is fixed on the lower bottom plate 2-8 using bolts, the lower bottom plate is fixed on the power mechanism 2-9 using flat head screws, the sliding block threaded hole 2-3-2 and the screw rod 2-9-1 are kept coaxial; start the motor, and move the sliding block 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, and connect the baffle 2-1 and the guide plate 2-2.

[0077] Step 2, calibration of strain gauge.

[0078] The assembled adjustment device body is fixed vertically to the ground, and the rear cable net tensioning mechanism elastic plate hanging cable hole 2-5-2 is sequentially inserted into the rear cable net cable section; a plurality of groups of different sizes of tension are applied to the cable section in sections, the function plate detects the output voltage of the strain gauge, the mapping relationship between the cable force and the output voltage is formed, and then the experimental cable section is removed.

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

[0080]

[0081] F=EεA

[0082]

[0083] In the formula, 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 cable section, A is the cross-sectional area of the strain gauge resistor, and E is the elastic modulus.

[0084] Step 3, installation of adjustment mechanism.

[0085] The rear cable net 3 cable section is passed through the elastic plate hanging lock hole 2-5-2 and tied tightly, and the longitudinal cable 1 is passed through the longitudinal adjustment cable through hole 2-1-2 of the baffle and the cable through hole 2-3-1 of the sliding block and tied around.

[0086] Step 4, cable force data acquisition.

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

[0088] Step 5, determining the motor direction and angle.

[0089] According to the collected cable force data, the initial cable segment length of the antenna and the initial node position, a finite element model of the cable net antenna is established by using the finite element method, and the longitudinal cable adjustment amount is calculated by using the quadratic programming, referring to Fig. 15 (a), if the adjustment amount is positive, the motor is forward, if the adjustment amount is negative, the motor is reversed, and the rotation angle of the motor is determined according to the adjustment amount value.

[0090] Step 6, the stepping motor starts to rotate, referring to Fig. 15 (a), if the motor is forward, the screw rod is forward, the sliding block is downward, and the node moves to A', if the motor is reversed, the screw rod is reversed, the sliding block is upward, and the node moves to A'', referring to Fig. 15 (c); the stepping motor movement is ended, and the front cable net surface is changed.

[0091] Step 7, detecting whether the cable net antenna surface precision meets the requirements, if the surface precision meets the requirements, ending the surface adjustment, if not, repeating steps 5-7 until the surface precision requirements are met.

[0092] The present application can solve the problems of small structural damping, tend to be flexible, not conducive to surface maintenance, small stroke, sensitive to temperature, poor linearity, easy to be disturbed by electromagnetic interference and the like, and can maintain the surface precision and meet the requirements of electrical performance.

[0093] The present application is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present application, those skilled in the art can make some substitutions and modifications to some technical features without creative labor, and these substitutions and modifications are all within the protection scope of the present application.

Claims

1. A large-scale mesh antenna type surface active adjustment device, characterized in that, The adjusting device body is hung on a longitudinal adjusting cable and a rear cable net of a large cable net antenna, and the longitudinal adjusting cable is hung on a front cable net; The adjusting device body comprises a power mechanism, a rear cable net tensioning mechanism, an information acquisition and processing mechanism, and a front cable net adjusting mechanism; the power mechanism is connected to the front cable net adjusting mechanism through a lead screw passing through the rear cable net tensioning mechanism, and the information acquisition and processing mechanism is located on the rear cable net tensioning mechanism; A plurality of cable segments of the rear cable net are connected to the rear cable net tensioning mechanism, and the longitudinal adjusting cable is connected to a sliding block of the front cable net adjusting mechanism; the longitudinal adjusting cable moves with the sliding block by rotating the lead screw driven by the power mechanism; the information acquisition and processing mechanism acquires the cable force of the cable segment of the lower cable net, and the cable net surface is adjusted; The rear cable net tensioning mechanism comprises a cover plate, elastic plates, 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 arranged above the lower bottom plate; the upper bottom plate is arranged above the functional plate; the cover plate is connected above the upper bottom plate; a plurality of elastic plates extending downward are arranged on the surface of the cover plate close to the outer circumferential direction; a through hole is formed in the center of the cover plate; a plurality of cover plate grooves for passing through the elastic plates are formed on the ring surface of the cover plate; The front cable net adjusting mechanism comprises a baffle, guide plates, and a sliding block; a pair of guide plates are arranged vertically along the two sides of the cover plate of the rear cable net tensioning mechanism; the lead screw of the power mechanism passes through the center of the cover plate and is connected to the baffle together with the pair of guide plates; the sliding block is slidably connected to the lead screw between the baffle and the cover plate; The baffle is a strip-shaped plate; a rectangular groove is formed on each side of the strip-shaped plate; the rectangular groove is matched with the guide plate; a longitudinal adjusting cable through hole is formed along the thickness direction of the baffle.

2. The large netted antenna type surface active adjusting device according to claim 1, characterized in that, The elastic plates are coaxially arranged along the center of the cover plate at equal intervals.

3. The large netted antenna type surface active adjusting device according to claim 1, characterized in that, The elastic plates are made of an elastic material; strain gauges are attached to the elastic plates; elastic plate positioning holes and elastic plate hanging cable holes for connecting the rear cable net are formed at the two ends of the elastic plates.

4. The large netted antenna type surface active adjusting device according to claim 1, characterized in that, A plurality of cable segments of the rear cable net pass through the elastic plate hanging cable holes and are tied; the longitudinal adjusting cable passes through the longitudinal adjusting cable through hole of the baffle, passes around the cable through hole of the sliding block, and is tied from the longitudinal adjusting cable through hole of the baffle, forming a ring-shaped lock.

5. The large netted antenna type surface active adjusting device according to claim 1, characterized in that, The functional plate is composed of a printed circuit board; the functional plate is one or more layers of functional plates.

6. A method of adjusting a large-mesh antenna type surface active adjustment device according to any one of claims 1-5, characterized by, The method comprises the following steps: Strain gauges are attached to the elastic plates of the rear cable net tensioning mechanism; the rear cable net tensioning mechanism is fixed on the power mechanism; the motor is started; the sliding block moves to the middle position of the lead screw along the lead screw; The assembled surface adjusting device is fixed vertically to the ground; the elastic plate hanging cable holes of the rear cable net tensioning mechanism are sequentially passed through the cable segments of the rear cable net; a plurality of groups of different sizes of pulling forces are applied to the cable segments in sections; the output of the strain gauges is detected through the functional plate; the mapping relationship between the cable force and the output is obtained; The cable segments of the rear cable net pass through the elastic plate hanging lock holes and are tied; the longitudinal adjusting cable passes through the longitudinal adjusting cable through hole of the baffle and the cable through hole of the sliding block and is tied; The functional plate acquires the output voltage of the cable segment in the actual prototype net surface through the strain gauges, and obtains the cable force of the cable segment of the rear cable net through the calibrated mapping relationship between the cable force and the voltage. According to the size of the cable force of the rear cable net segment, combining the initial cable segment length and the initial node position of the antenna, a finite element model of the cable net antenna is established, and the longitudinal cable adjustment amount is calculated. If the adjustment amount is positive, the motor is forward rotated; the slider is moved downward, and the node is moved to the state of the front cable net being pulled tight downward; if the adjustment amount is negative, the motor is reversed; the slider is moved upward, and the node is moved to the state of the front cable net being pulled horizontally, and the front cable net profile is changed; Whether the profile accuracy of the cable net antenna meets the requirements is detected. If the profile accuracy meets the requirements, the profile adjustment is ended; if not, the above calculation of the longitudinal cable adjustment amount and the forward and reverse rotation of the motor are repeated until the profile accuracy meets the requirements.

7. The adjustment method of the large-scale mesh antenna type surface active adjustment device according to claim 6, characterized in that, The mapping relationship between the cable force and the output is as follows: wherein is the strain gauge output voltage, is the strain rate, is the strain generated by the strain gauge, is the power supply voltage, is the cable force of the lower cable net cable segment, is the strain gauge resistance cross-sectional area, is the elastic modulus.

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