Static balance method of accelerometer pendulum assembly

Abstract

The invention provides a static balance method for a pendulum assembly of an accelerometer, which can solve the problem that the detection range and the detection precision of the accelerometer are influenced when the mass center and the centroid of the existing pendulum assembly are eccentric up and down. The method comprises the following steps: determining the density rho of a pendulum assembly to be balanced; first floating oil and second floating oil are selected and mixed, a floating oil mixed solution is prepared, and the density of the first floating oil is rho 1gt; rho is the density rho 2lt of the second floating oil; the rho, the volume V1 of the first floating oil and the volume V2 of the second floating oil meet the following formula: rho = (rho 1V1 + rho 2V2) / (V1 + V2); a pendulum assembly to be balanced is placed in the floating oil mixed liquid, and if the pendulum assembly vertically moves in the gravity field direction, the temperature of the floating oil mixed liquid is adjusted till the floating oil mixed liquid is in a suspended state; otherwise, not adjusting the temperature; if the swing assembly in the suspension state rolls over, the inner bottom faces, away from the flexible beam, of the two moving coil frameworks are both subjected to quantity reduction till the swing assembly is in a static balance state; otherwise, the pendulum assembly is in a static balance state, and static balance adjustment is completed.

Description

Technical Field

[0001] The invention relates to how to realize the static balance of an accelerometer pendulum assembly, and in particular to a static balance method of an accelerometer pendulum assembly. Background Art

[0002] The accelerometer is an inertial navigation device that uses Newton's second law (law of inertia) to measure acceleration and is one of the core components of the navigation system. The quartz accelerometer uses the principle of differential capacitance to detect acceleration. Specifically, the accelerometer uses a pendulum assembly to sense input acceleration. When there is an acceleration load in the direction of the input axis of the accelerometer, the pendulum assembly deviates from the equilibrium position under the action of the inertial force and performs a deflection motion around the flexible pivot. The differential capacitance sensor composed of the upper and lower yokes and the pendulum piece outputs differential capacitance, which is converted into a certain amount of current through the differential capacitance detector of the servo circuit, and then becomes a balanced current after integration and amplification and is output to the pendulum assembly. The balanced current cuts the magnetic flux lines of the upper and lower torquers (both the upper and lower torquers contain magnetic steel) to generate electromagnetic force. The electromagnetic force generated when the balanced current flows through the coil forms a balanced torque that is equal to the inertial torque in value and opposite in direction. The balanced torque is directly proportional to the acceleration. It can be seen from this that the pendulum assembly of the accelerometer directly senses the magnitude of the inertial force and is a key component that determines the detection accuracy of the accelerometer.

[0003] Figure 1 The structure diagram of a conventional pendulum assembly is shown in FIG. Figure 1 It can be seen that the pendulum assembly 01 is composed of a pendulum piece 02 and two dynamic coil frames 03 bonded to the front and back sides of the pendulum piece 02 by adhesive 05, wherein the dynamic coil frame 03 plays a role in supporting the enameled wire, and the enameled wire plays a role in transmitting the induced current. The dynamic coil frame 03 and the enameled wire together constitute a dynamic coil assembly, and the dynamic coil assemblies on the front and back sides are connected in series end to end. In actual applications, the dynamic coil assemblies on the front and back sides are connected in series by gold wire welding. Figure 2 The structure diagram of a conventional pendulum is shown in FIG. Figure 2 It can be seen that the pendulum piece 02 includes a pendulum tongue 06 and two flexible beams 04, wherein the two flexible beams 04 of the pendulum piece 02 are very thin (generally about 0.02 mm), and the flexible beams 04 can ensure that the pendulum piece 02 can swing freely along the sensitive direction, and restrict the pendulum piece 02 in other directions. At present, since the flexible beams 04 of the pendulum piece 02 are very thin and easily damaged, the shape and position tolerances of the pendulum assembly 01 after assembly can only be guaranteed by structural design and fixtures, and cannot be tested, resulting in a poor balance quality factor of the accelerometer pendulum. When the accelerometer is working, in an ideal state, the centroid A (electromagnetic force) and the center of mass B (inertia force) of the pendulum assembly 01 coincide with each other. However, in actual conditions, the center of mass B of the pendulum assembly 01 is often eccentric to the centroid A, such as Figure 3As shown, when the center of mass B of the pendulum assembly 01 is eccentric above or below relative to the centroid A of the pendulum assembly 01, there will be an eccentricity ΔL between the center of mass B and the centroid A along the vertical direction. The eccentricity ΔL will cause the pendulum assembly 01 to "curl" relative to the flexible beam 04. This "curling" movement causes the pendulum assembly 01 to interfere with the upper and lower torquers in advance, causing the pendulum piece 02 to "stop" in advance, thereby affecting the detection range and detection accuracy of the accelerometer. Summary of the invention

[0004] The purpose of the present invention is to solve the technical problem that when the center of mass and the centroid of the existing pendulum assembly are eccentric up and down, the detection range and detection accuracy of the accelerometer will be affected, and to provide a static balancing method for the pendulum assembly of the accelerometer.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A static balancing method for an accelerometer pendulum assembly is characterized in that it comprises the following steps:

[0007] Step 1, determine the density ρ of the pendulum assembly to be balanced;

[0008] Step 2, preparing a floating oil mixture;

[0009] A first floating oil and a second floating oil are selected and mixed to prepare a floating oil mixture; the density of the first floating oil is ρ1>ρ, the density of the second floating oil is ρ2<ρ, and the volume V1 of the first floating oil and the volume V2 of the second floating oil satisfy the following condition: ρ=(ρ1V1+ρ2V2) / (V1+V2);

[0010] Step 3: buoyancy correction;

[0011] The pendulum assembly to be balanced is placed in the oil floating mixture. If the pendulum assembly has vertical movement in the direction of the gravity field, the temperature of the oil floating mixture is adjusted until the pendulum assembly is in a suspended state, and the suspended state means that there is no vertical movement in the direction of the gravity field; otherwise, step 4 is directly executed;

[0012] Step 4: Observe the movement status;

[0013] If the pendulum assembly in the suspended state in step 3 tumbles in the floating oil mixture, step 5 is performed; otherwise, the pendulum assembly is in a static balance state, and the static balance adjustment of the pendulum assembly is completed;

[0014] Step 5: Balance and remove the weight of the pendulum assembly;

[0015] The inner bottom surfaces of the two moving coil frames of the pendulum assembly away from the flexible beam are both weighed until the pendulum assembly stops rolling and is in a static balance state, thereby completing the static balance adjustment of the pendulum assembly.

[0016] Furthermore, in order to improve the accuracy of static balancing, step 5 is specifically as follows:

[0017] A laser weighing machine is used to gradually weigh the inner bottom surfaces of the two moving coil frames of the pendulum assembly away from the flexible beam from the outside to the inside, and then the static balance of the pendulum assembly is tested in a floating oil mixture until the pendulum assembly stops rolling and is in a static balance state, thereby completing the static balance adjustment of the pendulum assembly.

[0018] Furthermore, step 5 specifically includes the following steps:

[0019] Step 5.1, remove the pendulum assembly from the floating oil mixture, clean and dry it, select a sector concentric with the inner bottom surface of each moving coil skeleton of the pendulum assembly away from the flexible beam as a de-metering area, divide the de-metering area into a plurality of concentric sectors with equal central angles and decreasing radii, the outer arc length of the sector with the largest area is equal to the arc length of the de-metering area, and the non-intersecting area of ​​two adjacent sectors is a de-metering belt;

[0020] Step 5.2, use a laser de-metering machine to de-meter the outermost de-metering band of each dynamic coil frame;

[0021] Step 5.3, place the pendulum assembly in the floating oil mixture. If the pendulum assembly tumbles, take the pendulum assembly out of the floating oil mixture, clean and dry it, and then return to step 5.2; otherwise, the pendulum assembly is in a static balance state, and the static balance adjustment of the pendulum assembly 1 is completed.

[0022] Furthermore, in order to improve the static balance removal accuracy, step 5 specifically includes the following steps:

[0023] Step 5.1, record the time t required for the pendulum assembly to rotate π / 2 angle; use computer dynamic simulation software to calculate the time t1 and t2 required for the pendulum assembly to rotate π / 2 angle in the extreme eccentricity state and the slight eccentricity state respectively. N , set the time period from 0 to t1 as the first interval T1, and set t1 to t N The time period is divided into the 2nd, ..., Nth interval segments of equal step length, namely T2, ..., TN; N is 3, 4 or 5;

[0024] The extreme eccentric state refers to the state when the eccentricity ΔL is 0.01L; the micro eccentric state refers to the state when the eccentricity ΔL is 0.001L; wherein L is the outer diameter of the swing piece;

[0025] Step 5.2: Use computer dynamic simulation software to calculate T1, T2, ..., T NCorresponding theoretical eccentric de-quantization; a sector concentric with the inner bottom surface of each moving coil skeleton of the pendulum assembly away from the flexible beam is selected as the de-quantization area, and according to the theoretical eccentric de-quantization corresponding to different intervals, the de-quantization area is divided into N+1 concentric sectors with equal central angles and decreasing radii, the outer arc length of the first sector is equal to the arc length of the de-quantization area, and the non-intersecting areas of the first sector and the second sector, the second sector and the third sector, ..., the Nth sector and the N+1th sector are the first de-quantization band, the second de-quantization band, ..., the Nth de-quantization band, respectively, corresponding to the 1st to Nth intervals, respectively;

[0026] Step 5.3: Compare the t recorded in step 5.1 with the divided T1, T2, ..., T N Conduct control;

[0027] Determine whether t falls within the nth interval, n=1, ..., N-1. If so, remove all the nth removal bands and directly execute step 5.4; otherwise, remove all the Nth removal bands to complete the static balance adjustment of the pendulum assembly.

[0028] Step 5.4: Retest the time t required for the pendulum assembly to rotate π / 2 in the oil mixture. If t ≥ t N , then the static balance adjustment of the pendulum assembly is completed, otherwise, proceed to step 5.5;

[0029] Step 5.5, de-meter the n+1th de-metering band of the pendulum assembly, and then return to execute step 5.4.

[0030] Further, the first de-metering zone, the second de-metering zone, ..., the Nth de-metering zone are all divided into a plurality of grids;

[0031] The inner arc length of the grid of the nth de-metering band is twice the outer arc length of the grid of the n+1th de-metering band, and the grid width of the nth de-metering band is twice the grid width of the n+1th de-metering band.

[0032] Furthermore, step 3 is specifically as follows:

[0033] The pendulum assembly to be balanced is placed in the floating oil mixture. When the pendulum assembly moves vertically upward, the temperature of the floating oil mixture is increased to reduce the density of the floating oil mixture and reduce the buoyancy of the pendulum assembly. When the pendulum assembly moves vertically downward, the temperature of the floating oil mixture is reduced to increase the density of the floating oil mixture and increase the buoyancy of the pendulum assembly until the pendulum assembly is in a suspended state. Otherwise, directly execute step 4.

[0034] Furthermore, step 1 is specifically as follows:

[0035] The pendulum assembly is weighed, and the mass of the pendulum assembly is recorded as M. Then, the volume of the pendulum assembly is recorded as V by the water displacement method. The density ρ of the pendulum assembly is calculated according to the following formula: ρ = M / V.

[0036] Beneficial effects of the present invention:

[0037] 1. The present invention provides a static balancing method for an accelerometer pendulum assembly, which can solve the problem that when the center of mass and centroid of the pendulum assembly are eccentric, the detection range and detection accuracy of the accelerometer are affected. Among them, the oil floating rolling method is used to intuitively evaluate the center of mass of the pendulum assembly as a whole, and to intuitively concretize the abstract indicators.

[0038] 2. In the present invention, the oil floating tumbling method is combined when balancing the pendulum assembly, which can improve the static balance quality factor of the pendulum assembly, make the center of mass and the centroid of the pendulum assembly better coincide, and can directly reduce the interference torque of the accelerometer pendulum assembly, improve its "twisting" and "curling" phenomena, thereby improving the detection accuracy of the accelerometer and reducing nonlinear errors.

[0039] 3. The present invention firstly adopts simulation software to establish the theoretical correspondence between the rolling time and the balance de-weighting area, roughly delineates N de-weighting zones, and then performs micro-correction on the static balance de-weighting through the actual rolling time of the pendulum assembly, thereby shortening the time of static balance de-weighting and improving the efficiency of static balance de-weighting. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a structural schematic diagram of an existing pendulum assembly;

[0041] Figure 2 It is a structural schematic diagram of an existing pendulum;

[0042] Figure 3 It is a structural schematic diagram of the existing pendulum assembly when the center of mass is eccentric to the centroid (a represents the acceleration direction);

[0043] Figure 1-Figure 3 Among them, 01-pendulum assembly, 02-pendulum piece, 03-dynamic coil frame, 04-flexible beam, 05-adhesive, 06-pendulum tongue;

[0044] Figure 4 It is a schematic diagram of a static balancing device of a pendulum assembly used in an embodiment of a static balancing method of an accelerometer pendulum assembly of the present invention;

[0045] Figure 5 Schematic diagram of the balancing process of the pendulum assembly in a suspended state when rolling in step 3 of the embodiment of the present invention (F represents buoyancy and G represents gravity);

[0046] Figure 6 is a schematic diagram of the balance removal of the pendulum assembly in step 5 of other embodiments of the present invention;

[0047] Figure 7 is a schematic diagram of a pendulum assembly in a static equilibrium state according to an embodiment of the present invention;

[0048] Figure 8 is a schematic diagram of the balance removal of the pendulum assembly in step 5 of the embodiment of the present invention;

[0049] Figure 4-Figure 8 In the figure, 1-pendulum assembly, 2-pendulum piece, 3-dynamic coil frame, 4-flexible beam, 5-de-metering area, 6-swing tongue, 7-floating oil mixture, 8-container, 9-temperature sensor, 10-temperature display interface, 11-temperature control plate, 12-the first de-metering belt, 13-the second de-metering belt, 14-the third de-metering belt, 15-the fourth de-metering belt. DETAILED DESCRIPTION

[0050] A static balancing method for an accelerometer pendulum assembly comprises the following steps:

[0051] Step 1: Determine the density ρ of the pendulum assembly 1 to be balanced

[0052] The pendulum assembly 1 is weighed, and the mass of the pendulum assembly 1 is recorded as M. Then, the volume of the pendulum assembly 1 is recorded as V by the water displacement method. The density ρ of the pendulum assembly 1 is calculated according to the following formula: ρ=M / V.

[0053] Step 2: Prepare the oil-floating mixture 7

[0054] The first floating oil and the second floating oil are selected and mixed to prepare a floating oil mixed liquid 7; the density of the first floating oil ρ1>ρ, the density of the second floating oil ρ2<ρ, and the volume V1 of the first floating oil and the volume V2 of the second floating oil satisfy the following condition: ρ=(ρ1V1+ρ2V2) / (V1+V2).

[0055] Step 3: Buoyancy correction

[0056] like Figure 4As shown, the oil-slick mixture 7 prepared in step 2 is loaded into the container 8 of the static balancing device of the pendulum assembly, and then the pendulum assembly 1 to be balanced is placed in the oil-slick mixture 7. Due to factors such as test volume error and temperature change, the density of the oil-slick mixture 7 may have an error with the density of the pendulum assembly 1, resulting in vertical movement of the pendulum assembly 1 in the direction of the gravity field after the pendulum assembly 1 is placed in the oil-slick mixture 7. When the pendulum assembly 1 moves vertically upward, the temperature of the container 8 is controlled by the temperature control plate 11 of the static balancing device of the pendulum assembly to increase the temperature of the oil-slick mixture 7, thereby reducing the density of the oil-slick mixture 7 and reducing the buoyancy of the pendulum assembly 1. When the pendulum assembly 1 moves vertically downward, the temperature of the floating oil mixture 7 is reduced by regulating the temperature of the container 8 through the temperature control plate 11, so as to increase the density of the floating oil mixture 7 and increase the buoyancy of the pendulum assembly 1. The temperature sensor 9 and the temperature display interface 10 of the static balance device of the pendulum assembly are respectively used to measure and display the temperature of the floating oil mixture 7 in real time, so as to evaluate the temperature control effect of the temperature control plate 11 and monitor the temperature stability. Through continuous adjustment, the pendulum assembly 1 is in a suspended state (i.e., there is no vertical movement in the direction of the gravity field); if the pendulum assembly 1 does not have vertical movement in the direction of the gravity field, step 4 is directly executed.

[0057] Step 4: Observe the movement status

[0058] If the pendulum assembly 1 in the suspended state in step 3 tumbles in the floating oil mixture 7 (the specific process is as follows Figure 5 ), then execute step 5; otherwise, Figure 7 As shown, the pendulum assembly 1 is in a static balance state, and the static balance adjustment of the pendulum assembly 1 is now completed.

[0059] Step 5: Balance and remove the weight of pendulum assembly 1

[0060] The inner bottom surfaces of the two moving coil frames 3 of the pendulum assembly 1 away from the flexible beam 4 are both weighed until the pendulum assembly 1 does not roll over and is in a static balance state, thus completing the static balance adjustment of the pendulum assembly 1;

[0061] In order to improve the accuracy of static balance de-weighting, corresponding de-weighting bands are given for different eccentricities ΔL. The larger the eccentricity ΔL, the larger the torque M=GΔL. G is the gravity of the pendulum assembly 1. From the moment of inertia formula M=Jω, it can be seen that when the moment of inertia J of the pendulum assembly 1 remains unchanged, the larger the speed ω; therefore, Figure 5 As shown, when the pendulum assembly 1 turns from the horizontal position to the vertical position, the rotation angle θ=π / 2, the required time is t, and the rotation speed ω is inversely correlated with t (where the rotation speed ω is a non-steady value);

[0062] In this embodiment, step 5 specifically includes the following steps:

[0063] Step 5.1, record the time t required for the pendulum assembly 1 to rotate an angle of π / 2 in the oil floating mixture 7; use computer dynamic simulation software to calculate the time t1 and t4 required for the pendulum assembly 1 to rotate an angle of π / 2 in the extreme eccentricity state and the slight eccentricity state, respectively, set the time period from 0 to t1 as the first interval T1, and divide the time period from t1 to t4 into the second, third, and fourth intervals of equal step length, namely T2, T3, and T4;

[0064] The extreme eccentric state refers to the state when the eccentricity ΔL is 0.01L; the micro-eccentric state refers to the state when the eccentricity ΔL is 0.001L; wherein L is the outer diameter of the pendulum 2;

[0065] Step 5.2, using computer dynamic simulation software, respectively calculate the theoretical eccentric removal corresponding to T1, T2, T3, and T4; remove the pendulum assembly 1 from the floating oil mixture 7, clean and dry it, select a sector concentric with the inner bottom surface of each moving coil skeleton 3 of the pendulum assembly 1 away from the flexible beam 4 as the removal area 5, and divide the removal area 5 into five concentric sectors with equal central angles and decreasing radii according to the theoretical eccentric removal corresponding to different intervals. The outer arc length of the first sector is equal to the arc length of the removal area 5, and the non-intersecting areas of the first sector and the second sector, the second sector and the third sector, the third sector and the fourth sector, and the fourth sector and the fifth sector are the first removal band 12, the second removal band 13, the third removal band 14, and the fourth removal band 15, respectively, corresponding to the first to fourth intervals, as shown in FIG. Figure 8 As shown;

[0066] Among them, the first de-metering zone 12, the second de-metering zone 13, the third de-metering zone 14, and the fourth de-metering zone 15 are evenly divided into a plurality of grids, the inner arc length and the grid width of the first de-metering zone 12 correspond to twice the outer arc length and the grid width of the second de-metering zone 13; the inner arc length and the grid width of the second de-metering zone 13 correspond to twice the outer arc length and the grid width of the third de-metering zone 14; the inner arc length and the grid width of the third de-metering zone 14 correspond to twice the outer arc length and the grid width of the fourth de-metering zone 15;

[0067] Step 5.3, compare the t recorded in step 5.1 with the divided T1, T2, T3, and T4;

[0068] Determine whether t falls within the nth interval, n = 1, 2, 3. If so, remove all the nth removal bands, and then directly execute step 5.4; if t falls within the fourth interval T4, remove all the fourth removal bands 15, and complete the static balance adjustment of the pendulum assembly 1;

[0069] Step 5.4, retest the time t required for the pendulum assembly 1 to rotate an angle of π / 2 in the floating oil mixture 7. If t≥t4, the static balance adjustment of the pendulum assembly 1 is completed, otherwise, execute step 5.5;

[0070] Step 5.5, take out the pendulum assembly 1, clean and dry it, then remove the weight of the n+1th removal belt of the pendulum assembly 1, and then return to execute step 5.4.

[0071] It should be noted that, in other embodiments, in order to improve the static balance precision, Figure 6 As shown, step 5 specifically includes the following steps:

[0072] Step 5.1, take out the pendulum assembly 1 from the floating oil mixture 7, clean and dry it, select a sector concentric with the inner bottom surface of each moving coil skeleton 3 of the pendulum assembly 1 away from the flexible beam 4 as the de-metering area 5, divide the de-metering area 5 into a plurality of concentric sectors with equal central angles and decreasing radii, the outer arc length of the sector with the largest area is equal to the arc length of the de-metering area 5, and the non-intersecting area of ​​two adjacent sectors is a de-metering belt;

[0073] Step 5.2, using a laser de-metering machine to de-meter the outermost de-metering band of each dynamic coil frame 3;

[0074] Step 5.3, place the pendulum assembly 1 in the floating oil mixture 7. If the pendulum assembly 1 tumbles, take the pendulum assembly 1 out of the floating oil mixture 7, clean and dry it, and then return to step 5.2; otherwise, the pendulum assembly 1 is in a static balance state, and the static balance adjustment of the pendulum assembly 1 is completed.

[0075] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A static balancing method for an accelerometer pendulum assembly, It is characterized in that The following steps are involved: Step 1, determining the density ρ of the pendulum assembly (1) to be balanced; Step 2, preparing a floating oil mixture (7); A first floating oil and a second floating oil are selected and mixed to prepare a floating oil mixed liquid (7); the density of the first floating oil is 1 >ρ, density of the second oil slick ρ 2 <ρ, the volume of the first oil spill V 1 and the volume V of the second oil slick 2 The following conditions are met: ρ=(ρ 1 V 1 +ρ 2 V 2 ) / (V 1 +V 2 ); Step 3: buoyancy correction; The pendulum assembly (1) to be balanced is placed in the floating oil mixed liquid (7), and if the pendulum assembly (1) has vertical movement in the direction of the gravity field, the temperature of the floating oil mixed liquid (7) is adjusted until the pendulum assembly (1) is in a suspended state, wherein the suspended state means that there is no vertical movement in the direction of the gravity field; Otherwise, go directly to step 4; Step 4: Observe the movement status; If the pendulum assembly (1) in the suspended state in step 3 tumbles in the floating oil mixture (7), step 5 is performed; otherwise, the pendulum assembly (1) is in a static balance state, and the static balance adjustment of the pendulum assembly (1) is completed; Step 5, balance the pendulum assembly (1); The inner bottom surfaces of the two moving coil frames (3) of the pendulum assembly (1) away from the flexible beam (4) are both deweighted until the pendulum assembly (1) stops rolling and is in a static balance state, thereby completing the static balance adjustment of the pendulum assembly (1).

2. The static balancing method of the accelerometer pendulum assembly according to claim 1, It is characterized in that Step 5 is as follows: A laser de-metering machine is used to gradually de-meter the inner bottom surfaces of the two moving coil frames (3) of the pendulum assembly (1) away from the flexible beam (4) from the outside to the inside, and then the static balance of the pendulum assembly (1) is tested in a floating oil mixture (7) until the pendulum assembly (1) does not roll over and is in a static balance state, thereby completing the static balance adjustment of the pendulum assembly (1).

3. The static balancing method of the accelerometer pendulum assembly according to claim 2, It is characterized in that Step 5 specifically includes the following steps: Step 5.1, remove the pendulum assembly (1) from the floating oil mixture (7), clean and dry it, select a sector concentric with the inner bottom surface of each moving coil skeleton (3) of the pendulum assembly (1) away from the flexible beam (4) as a de-metering area (5), divide the de-metering area (5) into a plurality of concentric sectors with equal central angles and decreasing radii, the outer arc length of the sector with the largest area is equal to the arc length of the de-metering area (5), and the non-intersecting area of ​​two adjacent sectors is a de-metering belt; Step 5.2, using a laser de-metering machine to de-meter the outermost de-metering band of each dynamic coil frame (3); Step 5.3, placing the pendulum assembly (1) in the floating oil mixture (7). If the pendulum assembly (1) tumbles, remove the pendulum assembly (1) from the floating oil mixture (7), clean and dry it, and then return to step 5.2; otherwise, the pendulum assembly (1) is in a static balance state, and the static balance adjustment of the pendulum assembly (1) is completed.

4. The static balancing method of the accelerometer pendulum assembly according to claim 1, It is characterized in that Step 5 specifically includes the following steps: Step 5.1, record the time t required for the pendulum assembly (1) to rotate an angle of π / 2; use computer dynamic simulation software to calculate the time t required for the pendulum assembly (1) to rotate an angle of π / 2 in the extreme eccentricity state and the slight eccentricity state respectively. 1 ,t N , from 0 to t 1 The time period is set as the first interval T1, and t 1 to N The time period is divided into the 2nd, ..., Nth interval segments of equal step length, namely T2, ..., TN; N is 3, 4 or 5; The extreme eccentric state refers to the state when the eccentricity ΔL is 0.01L; the micro-eccentric state refers to the state when the eccentricity ΔL is 0.001L; wherein L is the outer diameter of the pendulum (2); Step 5.2, using computer dynamic simulation software, respectively calculate the theoretical eccentric deflection corresponding to T1, T2, ..., TN; select a sector concentric with the inner bottom surface of each moving coil skeleton (3) of the pendulum assembly (1) away from the flexible beam (4) as the deflection area (5); according to the theoretical eccentric deflection corresponding to different intervals, the deflection area (5) is divided into N+1 concentric sectors with equal central angles and decreasing radii; the outer arc length of the first sector is equal to the arc length of the deflection area (5); the non-intersecting areas of the first sector and the second sector, the second sector and the third sector, ..., the Nth sector and the N+1th sector are the first deflection band (12), the second deflection band (13), ..., the Nth deflection band, respectively corresponding to the 1st to Nth intervals; Step 5.3, compare t recorded in step 5.1 with the divided T1, T2, ..., TN; Determine whether t falls within the nth interval, n=1, ..., N-1. If so, remove all the nth removal band and directly execute step 5.4; otherwise, remove all the Nth removal band to complete the static balance adjustment of the pendulum assembly (1); Step 5.4: Retest the time t required for the pendulum assembly (1) to rotate an angle of π / 2 in the oil mixture (7). If t ≥ t N , then the static balance adjustment of the pendulum assembly (1) is completed, otherwise, proceed to step 5.5; Step 5.5, de-meter the n+1th de-metering band of the pendulum assembly (1), and then return to execute step 5.

4.

5. The static balancing method of the accelerometer pendulum assembly according to claim 4, Features: The first de-metering band (12), the second de-metering band (13), ..., and the Nth de-metering band are divided into a plurality of grids; The inner arc length of the grid of the nth de-metering band is twice the outer arc length of the grid of the n+1th de-metering band, and the grid width of the nth de-metering band is twice the grid width of the n+1th de-metering band.

6. A static balancing method for an accelerometer pendulum assembly according to any one of claims 1 to 5, It is characterized in that Step 3 is as follows: The pendulum assembly (1) to be balanced is placed in the floating oil mixture (7). When the pendulum assembly (1) moves vertically upward, the temperature of the floating oil mixture (7) is increased to reduce the density of the floating oil mixture (7) and reduce the buoyancy of the pendulum assembly (1). When the pendulum assembly (1) moves vertically downward, the temperature of the floating oil mixture (7) is reduced to increase the density of the floating oil mixture (7) and increase the buoyancy of the pendulum assembly (1) until the pendulum assembly (1) is in a suspended state; otherwise, directly execute step 4.

7. The static balancing method of the accelerometer pendulum assembly according to claim 6, It is characterized in that Step 1 is as follows: The pendulum assembly (1) is weighed, and the mass of the pendulum assembly (1) is recorded as M. Then, the volume of the pendulum assembly (1) is recorded as V by the water displacement method. The density ρ of the pendulum assembly (1) is calculated according to the following formula: ρ = M / V.

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