Method for formulating product impact environment assessment conditions under combined action of multiple unlocking devices

Abstract

The invention provides a method for formulating product impact environment assessment conditions under the combined action of multiple unlocking devices. The method comprises the following steps: assessing impact environment magnitudes and influence ranges of different types of unlocking devices; analyzing the total distance between the product mounting surface and the impact source and the interplanar turning times between the product mounting surface and the impact source, and further calculating the impact environment magnitude of single-point detonation; an empirical formula is adopted to calculate the impact environment magnitude of multi-point simultaneous detonation; and comparing the magnitude of the impact environment of different types of unlocking devices borne by the single-machine product, performing maximum enveloping and rounding, and calculating to obtain the impact environment assessment condition of the single-machine product.

Description

Technical Field

[0001] The present invention belongs to the field of spacecraft technology, and specifically, relates to a method for formulating product impact environment assessment conditions under the combined action of multiple unlocking devices. The present invention is applicable to a single-unit satellite product with multiple types of unlocking devices, and is also applicable to any satellite model with an unlocking device, especially a method for formulating impact environment assessment conditions for a single-unit product under the combined action of different types of unlocking devices. Background Art

[0002] With the rise of commercial satellites in recent years, low-cost small satellites have gradually developed towards miniaturization (to the level of 40 to 50 kilograms or even lower). Due to the size limit of the satellite, the layout of the stand-alone product on the satellite is very compact, and the distance from the unlocking device cannot be kept far enough away like traditional large satellites to fully attenuate the impact of the pyrotechnic impact. Therefore, in order to ensure that the impact response of the installation part of the stand-alone product is within the range that the stand-alone product can withstand, it is extremely necessary to reduce the impact response of the impact source. Therefore, the unlocking method of the small satellite separation unlocking device has developed towards diversification. In addition to the pyrotechnic cutter, the hot knife and memory alloy unlocking methods are also introduced. Small satellites composed of two tiny satellites usually have pyrotechnic cutters, hot knives and memory alloy unlocking at the same time, and the additional impact response caused by carrying multiple satellites on one rocket must also be considered.

[0003] Traditional satellite development generally includes three stages: scheme, prototype and final prototype. In the scheme or prototype stage, the satellite-rocket separation device, mechanism unlocking device, etc. are unlocked and detonated to obtain the impact response of the installation part of the single product, thereby guiding the formulation of the impact test conditions for the single product. In recent years, due to the tight development schedule and the increasing number of low-cost models, the phenomenon of one-step final prototype has become more and more common. In the absence of a full-star detonation impact test on various unlocking devices to obtain the impact response data of the installation surface of the single product as the basis for the formulation of the impact test conditions, how to formulate reasonable impact test conditions for the single product has become a problem.

[0004] Patent document CN111964860A discloses a new shock response data interpretation method, which formulates component shock test conditions through measured shock response data from spacecraft system-level tests. The shock test conditions formulated in this patent document are singular, and cannot solve the formulation of product shock environment assessment conditions under combined effects. For the formulation of shock test conditions for stand-alone products, the maximum envelope of different unlocking methods is not fully considered, and it is extremely dependent on the unlocking shock test data of the entire star. Summary of the invention

[0005] In view of the defects in the prior art, the purpose of the present invention is to provide a method and system for formulating impact environment assessment conditions for a single product under the combined action of different types of unlocking devices.

[0006] A method for formulating product impact environment assessment conditions under the combined action of multiple unlocking devices provided by the present invention includes:

[0007] Step 1: Identify the type of unlocking device corresponding to the satellite model and the unlocking method used;

[0008] Step 2: Evaluate the shock environment magnitude and impact range of different types of unlocking devices, and obtain the shock environment response magnitude of the unlocking method used by the unlocking device;

[0009] Step 3: Analyze the total distance between the product installation surface and the impact source and the number of inter-surface transitions between the two, and then calculate the magnitude of the impact environment for the detonation of the single unlocking device;

[0010] Step 4: Calculate the magnitude of the shock environment when multiple unlocking devices are detonated simultaneously based on experience;

[0011] Step 5: Compare the impact environment levels of different types of unlocking devices that the product is subjected to, and calculate the impact environment assessment conditions of the product.

[0012] Preferably, the step 1 comprises: step 1.1: identifying the types of all unlocking devices corresponding to the satellite model; step 1.2: confirming the unlocking method used by each unlocking device identified in step 1.1.

[0013] Preferably, the unlocking device includes: a satellite-rocket separation unlocking device, a star separation unlocking device, and a mechanism unlocking device.

[0014] Preferably, the unlocking methods include: unlocking with pyrotechnics, unlocking with a hot knife, and unlocking with a memory alloy.

[0015] Preferably, the mechanism unlocking device includes: a solar wing mechanism unlocking device, an antenna mechanism unlocking device, and a load product mechanism unlocking device.

[0016] Preferably, the satellite-rocket separation unlocking device includes: explosive bolt type, belt wrap type, and tension rope type.

[0017] Preferably, the step 3 includes: step 3.1: analyzing the impact level of hot knife unlocking according to the empirical values ​​of impact source response levels of different unlocking methods; step 3.2: analyzing the impact level of memory alloy unlocking according to the empirical values ​​of impact source response levels of different unlocking methods; step 3.3: analyzing the impact level of pyrotechnic unlocking according to the empirical values ​​of impact source response levels of different unlocking methods.

[0018] Preferably, the empirical values ​​of the response magnitude of the impact source of different unlocking methods are as follows:

[0019]

[0020] Preferably, the impact condition determination principle of the relative relationship between the stand-alone product and the unlocking device containing memory alloy is as follows:

[0021]

[0022] Preferably, the impact conditions of the relative relationship between a single product and a single detonation source are determined according to the following principles:

[0023]

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention solves the problem of how to formulate reasonable impact conditions to fully evaluate the impact of different types of unlocking devices on a single product when there is a lack of impact test data for the satellite model.

[0026] 2. The present invention provides a method for formulating the impact environment assessment conditions of a single product under the combined action of different types of unlocking devices without the need for real detonation unlocking impact test data.

[0027] 3. The present invention can meet the needs of one-step sample satellite models, and provide reference and guidance for the formulation of subsequent single-machine product impact environment assessment conditions on one-step sample satellite models containing different types of unlocking devices.

[0028] 4. The present invention is also applicable to all types of satellite models, and the use of the present invention can be tailored according to their own characteristics; for non-one-step sample satellite models, the use of the present invention can save the cost of real pyrotechnic detonation tests.

[0029] 5. Under the premise of ensuring sufficient impact assessment of onboard stand-alone products, the present invention can effectively avoid the problem of some stand-alone products over-assessment due to the single impact condition. If mature stand-alone products can withstand the calculated impact response values ​​onboard, there is no need to conduct additional impact test assessments to meet unified impact condition indicators. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0031] Figure 1 This is a schematic diagram of a satellite unlocking device according to the present invention.

[0032] Figure 2 It is a schematic diagram of the distance and turning point between the single-unit product of the present invention and the detonation source.

[0033] Figure 3 Schematic diagram comparing three configurations of the satellite-rocket separation and unlocking device of the present invention.

[0034] Figure 4 It is a schematic diagram of the relative relationship between the explosion source for simultaneously detonating 12 explosive bolts V01 to V12 of the present invention and the installation surface of a single product.

[0035] Figure 5 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0036] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0037] Example:

[0038] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the method for formulating product impact environment assessment conditions under the combined action of multiple unlocking devices provided by the present invention includes:

[0039] Step 1: Identify all types of unlocking devices for satellite models and the unlocking methods used by each unlocking device;

[0040] Step 1.1: Identify all unlocking devices of satellite models. The present invention predicts the unlocking impact environment of more than two different unlocking devices. The basic categories are as follows: Figure 1 As shown, it generally includes: a satellite-rocket separation unlocking device, a star separation unlocking device, and a mechanism unlocking device;

[0041] Among them, the mechanism unlocking device includes: a solar wing mechanism unlocking device, an antenna mechanism unlocking device, and a load product mechanism unlocking device;

[0042] The satellite-rocket separation unlocking devices include: explosive bolt type, strap type, and tension cable type.

[0043] Step 1.2: Confirm the unlocking method used by each unlocking device identified in step 1.1, including: pyrotechnic unlocking, hot knife unlocking, and memory alloy unlocking.

[0044] Step 2: Evaluate the impact environment magnitude and impact range of different types of unlocking devices, and understand the impact environment response magnitude of the unlocking method used by the unlocking device. The empirical data of the impact environment magnitude of different unlocking methods in step 1.2 are detailed in Table 1. It should be noted that there are differences between different products of the same type, and there is also randomness between the same type and the same product. Therefore, a certain margin needs to be considered in the use of the data in the table.

[0045] Table 1 Empirical values ​​of impact source response magnitude for different unlocking methods

[0046]

[0047] Step 3: If Figure 2 For example, the total distance between the mounting surface of a product (e.g., a single machine) and the impact source and the number of inter-surface transitions between the two are analyzed to calculate the magnitude of the impact environment for the detonation of a single unlocking cutter;

[0048] Specifically, step 3.1: From Table 1 of step 2, it can be seen that the impact of hot knife unlocking does not need to be considered, and generally a single machine can adapt to this impact level;

[0049] Step 3.2: From Table 1 of step 2, it can be seen that the magnitude of the memory alloy unlocking impact is small. The relative position of the stand-alone product and the unlocking device containing the memory alloy and the corresponding impact response condition determination principle are shown in Table 2;

[0050] Table 2 Relative relationship between stand-alone products and unlocking devices containing memory alloys Impact condition determination principles

[0051]

[0052] Step 3.3: From Table 1 of Step 2, it can be seen that the magnitude of the impact of the unlocking of the pyrotechnic is relatively large, and it is necessary to consider the attenuation of the unlocking device configuration, distance and turning. The relative position of the single-unit product and the single detonation source and the corresponding impact response conditions are determined in Table 3. The three configurations of the satellite-rocket separation unlocking device are as follows: Figure 3 shown.

[0053] To predict the unlocking impact environment of different unlocking devices, it is necessary to consider the empirical attenuation of distance, the empirical attenuation of transitions between different planes, and the attenuation of different unlocking device configurations.

[0054] Among them, the distance attenuation margin factor at a frequency of 1500 Hz, the empirical attenuation margin factor of a transition between different planes, and the empirical attenuation margin factors of different unlocking device configurations are detailed in Table 3.

[0055] Table 3 Relative relationship between single-unit products and single detonation source Impact condition determination principles and examples

[0056]

[0057] Step 4: Calculate the magnitude of the impact environment of multiple simultaneous detonations based on experience. The method for formulating the impact environment assessment conditions for a single product under the combined action of different types of unlocking devices not only considers the impact of a single explosion, but also considers the elimination or superposition effect of the shock waves of multiple explosions when they are transmitted to the installation location of the single product under the condition of multiple simultaneous detonations;

[0058] When multiple points are detonated simultaneously, for example, 12 explosive bolts are detonated simultaneously on the star-rocket separation surface, and the 12 explosive bolts are distributed in a circle, the single-machine product between the two pyrotechnics is simultaneously subjected to the shock waves of the two detonation sources, as shown in the schematic diagram. Figure 4 As shown, the two shock waves may have a mutual attenuation effect or a mutual superposition effect. According to the research and development experience, the mutual attenuation margin factor is about 0.6, and the mutual superposition coefficient is about 1.8. In order to ensure that the impact conditions completely cover the superposition effect and consider the randomness of the pyrotechnics, when formulating the impact test conditions, the superposition assessment coefficient is taken as 2.0, and the possibility of mutual attenuation effect is not considered. Taking the 2nd row of Table 3 as an example, the impact response magnitude of a single-point detonation on a single machine is 560g, and the impact response magnitude of a single-machine product under the combined action of two-point detonations is 1120g (1500-4000Hz); taking the 4th row of Table 3 as an example, the impact response magnitude of a single-point detonation on a single machine is 1480g, and the impact response magnitude of a single-machine product under the combined action of two pyrotechnics is 2960g (1500-4000Hz), as shown in Table 4 of step 5.

[0059] Step 5: Compare the impact environment levels of different types of unlocking devices that stand-alone products are subjected to, and use the maximum envelope rounding method to calculate the impact environment assessment conditions for stand-alone products. The method for formulating the impact environment assessment conditions for stand-alone products under the combined action of different types of unlocking devices is not limited to a single unlocking, but comprehensively considers the impact of all unlocking impact environments. The impact assessment conditions have a maximum envelope for all unlocking impact levels.

[0060] The determination principles and examples are shown in Table 4. The minimum impact condition cannot be less than 800g. If the calculated value is less than 800g, 800g shall be used as the impact condition.

[0061] Table 4 Principles and examples for determining the final impact conditions of single-unit products

[0062]

[0063] Example 2

[0064] To sum up, the present invention is a method for formulating impact environment assessment conditions for single-machine products under the combined action of different types of unlocking devices. The present invention can effectively avoid the problem of some single-machine products failing to pass the assessment due to the single impact condition, while ensuring sufficient impact assessment of the single-machine products on the satellite. It can even save the cost of detonation impact testing of real pyrotechnics of non-one-step genuine satellite models.

[0065] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A method for formulating product impact environment assessment conditions under the combined action of multiple unlocking devices, characterized in that: include: Step 1: Identify the type of unlocking device corresponding to the satellite model and the unlocking method used; Step 2: Evaluate the shock environment magnitude and impact range of different types of unlocking devices, and obtain the shock environment response magnitude of the unlocking method used by the unlocking device; Step 3: Analyze the total distance between the product installation surface and the impact source and the number of inter-surface transitions between the two, and then calculate the magnitude of the impact environment for the detonation of the single unlocking device; Step 4: Calculate the magnitude of the shock environment when multiple unlocking devices are detonated simultaneously based on experience; Step 5: Compare the impact environment levels of different types of unlocking devices that the product is subjected to, and calculate the impact environment assessment conditions of the product.

2. The method for formulating product impact environment assessment conditions under the combined action of multiple unlocking devices according to claim 1 is characterized in that: The step 1 comprises: Step 1.1: Identify the types of all unlocked devices corresponding to the satellite model; Step 1.2: Confirm the unlocking method used by each unlocking device identified in step 1.

1.

3. The method for formulating product impact environment assessment conditions under the combined action of multiple unlocking devices according to claim 2 is characterized in that: The unlocking device includes: a satellite-rocket separation unlocking device, a star separation unlocking device, and a mechanism unlocking device.

4. The method for formulating product impact environment assessment conditions under the combined action of multiple unlocking devices according to claim 2 is characterized in that The unlocking methods include: unlocking with explosives, unlocking with a hot knife, and unlocking with a memory alloy.

5. The method for formulating product impact environment assessment conditions under the combined action of multiple unlocking devices according to claim 3 is characterized in that: The mechanism unlocking device includes: a solar wing mechanism unlocking device, an antenna mechanism unlocking device, and a load product mechanism unlocking device.

6. The method for formulating product impact environment assessment conditions under the combined action of multiple unlocking devices according to claim 3 is characterized in that: The satellite-rocket separation unlocking devices include: explosive bolt type, strap type, and tension cable type.

7. The method for formulating product impact environment assessment conditions under the combined action of multiple unlocking devices according to claim 1 is characterized in that: The step 3 comprises: Step 3.1: Analyze the impact magnitude of hot knife unlocking according to the empirical values ​​of the impact source response magnitude of different unlocking methods; Step 3.2: Analyze the unlocking impact magnitude of the memory alloy according to the empirical values ​​of the impact source response magnitude of different unlocking methods; Step 3.3: Analyze the impact magnitude of the unlocking of the pyrotechnic device based on the empirical values ​​of the impact source response magnitude of different unlocking methods.

8. The method for formulating product impact environment assessment conditions under the combined action of multiple unlocking devices according to claim 1 is characterized in that: The empirical values ​​of the impact source response magnitudes of different unlocking methods are:

9. The method for formulating product impact environment assessment conditions under the combined action of multiple unlocking devices according to claim 1 is characterized in that: The impact conditions of the relative relationship between the stand-alone product and the unlocking device containing memory alloy are determined according to the following principles:

10. The method for formulating product impact environment assessment conditions under the combined action of multiple unlocking devices according to claim 1, characterized in that: The principle for determining the impact conditions of the relative relationship between a single product and a single detonation source is as follows.

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