A hardness testing method and system based on helmet

Abstract

The invention relates to the technical field of helmet testing, and discloses a hardness testing method and system based on a helmet, comprising: dividing the outer surface of the helmet into regions for determining a test position, firstly performing a collision test at any angle on the helmet, obtaining the position of a concave region formed by the collision test, adopting a corresponding pressure point acquisition method according to the position of the concave region, performing a pressure test on the pressure point, respectively setting a collision qualified threshold and a pressure qualified threshold, and defining the test result by real-time monitoring the area of ​​the concave region formed by the collision test and the limit pressure of the pressure test, judging the size relationship between the concave region and the collision qualified threshold and the pressure qualified threshold.

Description

Technical Field

[0001] The invention relates to the technical field of helmet testing, and in particular to a hardness testing method and system based on a helmet. Background Art

[0002] As the safety of non-motor vehicles is receiving increasing attention, non-motor vehicle passenger helmets have become an important device to protect riders from head injuries. Due to the sharp increase in the number of non-motor vehicles in recent years, higher requirements have been placed on the quality and safety of helmets.

[0003] With the development of science and technology, the safety testing of helmets is becoming more and more standardized. The progress of helmet safety testing not only reflects the gradual increase in human awareness and demand for head protection, but also demonstrates the progress and innovation of safety helmet production technology. Continuous research and development have continuously improved the quality and function of safety helmets, providing reliable protection for the head safety of workers, athletes and ordinary people.

[0004] However, the current testing method for helmet hardness is too simple. It can only measure the hardness of a helmet by colliding and pressing the helmet. Such a test only tests the maximum impact force and pressure that the helmet can withstand at a single time, ignoring the possibility of secondary damage to the helmet in an actual accident, and is unable to test whether the helmet can withstand the pressure of secondary damage.

[0005] In summary, there is an urgent need for a helmet hardness testing method that can solve the above problems. Summary of the invention

[0006] The present invention provides a helmet-based hardness testing method and system, which are used to promote solving the problems mentioned in the above background technology.

[0007] The present invention provides the following technical solutions: a hardness testing method and system based on a helmet,

[0008] Optionally, a helmet-based hardness test method including:

[0009] Place the helmet mouth downward on the test bench;

[0010] Divide the outer surface of the helmet into test areas;

[0011] The inner surface of the helmet is the contact surface between the wearer's head and the helmet, and the outer surface of the helmet is the non-contact surface between the wearer's head and the helmet;

[0012] The test area includes a central test area and an edge test area;

[0013] Performing a collision test on the outer surface of the helmet at any angle to determine the location of the concave area formed by the collision test;

[0014] According to the location of the sunken area, corresponding pressure points are selected for pressure testing;

[0015] If the sunken area is in the central test area, the contour of the sunken area is obtained, the longest line segment in the contour of the sunken area is calculated, and a pressure point is selected for pressure testing according to the longest line segment in the contour of the sunken area;

[0016] If the concave area is in the edge test area, the pressure point is determined according to the center point of the concave area for pressure testing;

[0017] The helmet test results are judged according to the threshold value.

[0018] Optionally, the outer surface of the helmet is divided into test areas:

[0019] The helmet tested is a hemispherical helmet with a hemispherical radius of r;

[0020] The contact surface formed between the helmet and the test bench is a circle with a radius of r, which is recorded as the contact cross section;

[0021] A diameter is obtained on the contact section, which is recorded as the segmentation diameter. The segmentation diameter intersects with the contour of the contact section at points a and b.

[0022] Connecting point a and point b through the outer surface of the helmet, an arc is formed on the outer surface of the helmet, which is recorded as a segmentation arc, and the section formed by the segmentation arc and the segmentation diameter is perpendicular to the contact section, and the section formed by the segmentation arc and the segmentation diameter is recorded as the segmentation section;

[0023] Get the split section contour, select two points on the split section contour that are perpendicular to the contact section. The points are recorded as the first segmentation point and the second segmentation point;

[0024] Draw a circle parallel to the contact section on the outer surface of the helmet through the first dividing point and the second dividing point, and record the outline of the circle as the dividing line;

[0025] Divide the outer surface of the helmet according to the dividing line;

[0026] The area between the dividing line and the contact section contour is recorded as the edge test area;

[0027] The area outside the edge test area is recorded as the central test area.

[0028] Optionally, the helmet is subjected to a collision test at any angle to determine the position of the concave area formed by the collision test:

[0029] If the sunken area is only in the central test area, mark the sunken area position in the central test area;

[0030] If the sunken area is only in the edge test area, mark the sunken area position in the edge test area;

[0031] If the concave area is in both the central test area and the edge test area, the concave area is segmented into a central concave area and an edge concave area by a dividing line;

[0032] If the area of ​​the central concave region is greater than or equal to the area of ​​the edge concave region, the marked concave region is located in the central test area;

[0033] If the area of ​​the central recessed region is smaller than the area of ​​the edge recessed region, the marked recessed region is located in the edge test region.

[0034] Optionally, if the sunken area is in the central test area, the contour of the sunken area is obtained, the longest line segment in the contour of the sunken area is calculated, and a pressure point is selected for pressure testing according to the longest line segment in the contour of the sunken area:

[0035] Select any point on the contour of the concave area as the base point, and select test points at intervals of length n along the clockwise direction, denoted as , , … , j represents the number of test points, when When the distance between the contour and the base point on the contour of the concave area is less than or equal to n, stop selecting;

[0036] Randomly select two test points and calculate the distance between the test points, and enter the distance into the test point distance set;

[0037] Select the two test points with the longest distance as the pressure direction nodes;

[0038] Connect the pressure direction nodes to form a pressure line segment;

[0039] In the plane where the concave contour is located, a straight line is drawn through the center point of the pressure line segment and is perpendicular to the pressure line segment, and the intersection of the straight line and the concave contour is recorded as the first pressure base point and the second pressure base point;

[0040] A semicircle perpendicular to the contact cross section is made on the outer surface of the helmet through the first pressure base point and the second pressure base point, and the cross section formed by the contact between the semicircle and the contact cross section is recorded as the pressure cross section;

[0041] Obtain the pressure section profile, select two points on the pressure section profile whose vertical distance to the contact section is zero, and record them as the first pressure point and the second pressure point;

[0042] Setting a first pressure threshold;

[0043] Using a pressure device, taking a first pressure threshold as an initial pressure, and simultaneously applying continuous pressure to the first pressure point and the second pressure point toward the center of the contact cross section, the continuous pressure variation amplitude being m;

[0044] The profile of the contact section of the helmet during the pressure test is monitored in real time by a camera;

[0045] When the contour of the contact cross section is not circular, the current applied force is recorded as the limit force.

[0046] Optionally, if the recessed area is in the edge test area, a pressure point is determined according to the center point of the recessed area to perform a pressure test:

[0047] If the position of the concave region is in the edge test area, the area of ​​the concave region is obtained;

[0048] Get the center point of the contact section, draw a straight line perpendicular to the contact section with the center point of the contact section, and record the intersection of the straight line and the outer surface of the helmet as the vertex;

[0049] A semicircle is made on the outer surface of the helmet through the vertex to divide the concave area equally. The semicircle contacts the contact section to form a pressure section. The line segment where the pressure section intersects the contact section is recorded as the interception line segment.

[0050] Obtain a straight line passing through the center point of the intercepted line segment and perpendicular to the intercepted line segment, and record the intersection of the straight line and the contact section contour as the third pressure point and the fourth pressure point;

[0051] Setting a second pressure threshold;

[0052] Using a pressure device, taking the second pressure threshold as the initial pressure, and simultaneously applying continuous pressure to the first pressure point and the second pressure point toward the center of the contact cross section, the continuous pressure variation amplitude is m;

[0053] The profile of the contact section of the helmet during the pressure test is monitored in real time by a camera;

[0054] When the contour of the contact cross section is not circular, the current applied force is recorded as the limit force.

[0055] Optionally, the helmet test result is determined according to a threshold value:

[0056] Set collision eligibility threshold;

[0057] Get the area of ​​the concave region formed by the collision test;

[0058] If the area of ​​the concave region is greater than or equal to the collision qualified threshold, the current helmet test result is unqualified;

[0059] If the dented area is smaller than the collision pass threshold, the helmet is subjected to pressure testing;

[0060] Set the stress test pass threshold;

[0061] If the limit force in the helmet pressure test is greater than or equal to the pressure test pass threshold, the current helmet test result is qualified;

[0062] If the limit force in the helmet pressure test is less than the pressure test pass threshold, the current helmet test result is unqualified.

[0063] A system for implementing the helmet-based hardness testing method according to claim 1, comprising:

[0064] Test bench, used for crash and pressure testing by placing the helmet on the test bench;

[0065] The collision test module uses a collision test machine to collide the helmet at any angle to form a concave area;

[0066] The image detection module uses a camera to identify the contour and area of ​​the sunken area, and uses the camera to monitor in real time whether the helmet is deformed;

[0067] Pressure test module, using a hydraulic press to perform pressure tests on the pressure points of the helmet;

[0068] The data analysis module determines whether the helmet has passed the test by obtaining collision test data and pressure test data.

[0069] The present invention has the following beneficial effects:

[0070] 1. A helmet-based hardness testing method and system sets a dividing line according to the radius of the helmet, and divides the helmet into a central test area and an edge test area through the dividing line. This can more accurately locate the concave area formed after the collision test, thereby providing an accurate pressure point for the pressure test.

[0071] 2. This helmet-based hardness testing method and system divides the concave area that is in both the central test area and the edge test area into a central concave area and an edge concave area, and marks the position of the concave area by judging the area of ​​the central concave area and the area of ​​the edge concave area. In this way, the position of the concave area can be accurately defined, thereby improving the accuracy of the test.

[0072] 3. A hardness testing method and system based on a helmet. If the position of the concave area is in the central test area, then by obtaining the contour of the concave area, a base point is randomly selected on the contour of the concave area, and multiple equal-length test points are selected in sequence along the clockwise direction. By calculating the maximum value of the distance between the test points, it is selected as a pressure line segment. In the plane where the concave contour is located, a straight line perpendicular to the pressure line segment is drawn through the center point of the pressure line segment, and the intersection of the straight line and the concave contour is recorded as the first pressure base point and the second pressure base point. According to the first pressure base point and the second pressure base point, a semicircle perpendicular to the contact section is drawn through the outer surface of the helmet according to the first pressure base point and the second pressure base point. On the cross-sectional contour where the semicircle is located, a point with a vertical distance of zero to the contact section is selected as the first pressure point and the second pressure point. The first pressure point and the second pressure point are pressure-tested by a pressure device. The pressure points selected by this method are weak points of the helmet. By pressure-testing the weak points, the minimum bearing pressure of the helmet can be tested, making the test more scientific and reasonable.

[0073] 4. A hardness testing method and system based on a helmet, if the position of the recessed area is in the edge test area, then the area of ​​the recessed area is obtained, a straight line perpendicular to the contact section is made through the center point of the contact section, the intersection of the straight line and the outer surface of the helmet is recorded as a vertex, a semicircle that can bisect the area of ​​the recessed area is made according to the vertex, and according to the line segment intersecting the plane where the semicircle is located and the contact section, a straight line perpendicular to its center point is made, and the intersection of the straight line and the contour of the contact section is recorded as the third pressure point and the fourth pressure point, and a pressure test is performed on the third pressure point and the fourth pressure point by a pressure device, so that the most suitable pressure point for pressure testing can be selected according to the position of the recessed area in the edge test area, which has good applicability and flexibility, and at the same time, the limit pressure of the helmet before the helmet is subjected to secondary damage can be tested, which solves the problem of being unable to test whether the helmet can withstand the pressure of secondary damage.

[0074] 5. A helmet-based hardness testing method and system, which includes a test bench, a collision test module, an image detection module, a pressure test module and a data analysis module, realizes the automation of the test process, reduces the interference of human factors, and improves the test efficiency.

[0075] 6. This helmet-based hardness testing method and system can quantitatively evaluate the safety performance of the helmet by setting a collision pass threshold and a pressure test pass threshold to ensure that the helmet can meet safety standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0076] Figure 1 It is a schematic diagram of the structure of the present invention;

[0077] Figure 2 Pressure top view of the helmet. DETAILED DESCRIPTION

[0078] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0079] Example 1, see Figure 1 to Figure 2 , a helmet-based hardness testing method, comprising:

[0080] Place the helmet mouth downward on the test bench;

[0081] Divide the outer surface of the helmet into test areas;

[0082] The inner surface of the helmet is the contact surface between the wearer's head and the helmet, and the outer surface of the helmet is the non-contact surface between the wearer's head and the helmet;

[0083] The test area includes a central test area and an edge test area;

[0084] Performing a collision test on the outer surface of the helmet at any angle to determine the location of the concave area formed by the collision test;

[0085] According to the location of the sunken area, corresponding pressure points are selected for pressure testing;

[0086] If the sunken area is in the central test area, the contour of the sunken area is obtained, the longest line segment in the contour of the sunken area is calculated, and a pressure point is selected for pressure testing according to the longest line segment in the contour of the sunken area;

[0087] If the concave area is in the edge test area, the pressure point is determined according to the center point of the concave area for pressure testing;

[0088] The helmet test results are judged according to the threshold value.

[0089] The outer surface of the helmet is divided into test areas:

[0090] The helmet tested is a hemispherical helmet with a hemispherical radius of r;

[0091] The contact surface formed between the helmet and the test bench is a circle with a radius of r, which is recorded as the contact cross section;

[0092] A diameter is obtained on the contact section, which is recorded as the segmentation diameter. The segmentation diameter intersects with the contour of the contact section at points a and b.

[0093] Connecting point a and point b through the outer surface of the helmet, an arc is formed on the outer surface of the helmet, which is recorded as a segmentation arc, and the section formed by the segmentation arc and the segmentation diameter is perpendicular to the contact section, and the section formed by the segmentation arc and the segmentation diameter is recorded as the segmentation section;

[0094] Get the split section contour, select two points on the split section contour that are perpendicular to the contact section. The points are recorded as the first segmentation point and the second segmentation point;

[0095] Draw a circle parallel to the contact section on the outer surface of the helmet through the first dividing point and the second dividing point, and record the outline of the circle as the dividing line;

[0096] Divide the outer surface of the helmet according to the dividing line;

[0097] The area between the dividing line and the contact section contour is recorded as the edge test area;

[0098] The area outside the edge test area is recorded as the central test area.

[0099] The helmet is subjected to a collision test at any angle to determine the location of the concave area formed by the collision test:

[0100] If the sunken area is only in the central test area, mark the sunken area position in the central test area;

[0101] If the sunken area is only in the edge test area, mark the sunken area position in the edge test area;

[0102] If the concave area is in both the central test area and the edge test area, the concave area is segmented by a dividing line into a central concave area and an edge concave area;

[0103] If the area of ​​the central concave region is greater than or equal to the area of ​​the edge concave region, the marked concave region is located in the central test area;

[0104] If the area of ​​the central recessed region is smaller than the area of ​​the edge recessed region, the marked recessed region is located in the edge test region.

[0105] If the sunken area is in the central test area, the sunken area contour is obtained, the longest line segment in the sunken area contour is calculated, and a pressure point is selected for pressure testing according to the longest line segment in the sunken area contour:

[0106] Select any point on the contour of the concave area as the base point, and select test points at intervals of length n along the clockwise direction, denoted as , , … , j represents the number of test points, when When the distance between the contour and the base point on the concave area contour is less than or equal to n, stop selecting;

[0107] Randomly select two test points and calculate the distance between the test points, and enter the distance into the test point distance set;

[0108] Select the two test points with the longest distance as the pressure direction nodes;

[0109] Connect the pressure direction nodes to form a pressure line segment;

[0110] In the plane where the concave contour is located, a straight line is drawn through the center point of the pressure line segment and is perpendicular to the pressure line segment, and the intersection of the straight line and the concave contour is recorded as the first pressure base point and the second pressure base point;

[0111] A semicircle perpendicular to the contact cross section is made on the outer surface of the helmet through the first pressure base point and the second pressure base point, and the cross section formed by the contact between the semicircle and the contact cross section is recorded as the pressure cross section;

[0112] Obtain the pressure section profile, select two points on the pressure section profile whose vertical distance to the contact section is zero, and record them as the first pressure point and the second pressure point;

[0113] Setting a first pressure threshold;

[0114] The first pressure threshold is the initial pressure strength, which is 10N by default, where N is the pressure unit;

[0115] Using a pressure device, taking a first pressure threshold as an initial pressure, and simultaneously applying continuous pressure to the first pressure point and the second pressure point toward the center of the contact cross section, the continuous pressure variation amplitude being m;

[0116] The change amplitude m is 1N;

[0117] The profile of the contact section of the helmet during the pressure test is monitored in real time by a camera;

[0118] When the contour of the contact cross section is not circular, the current applied force is recorded as the limit force.

[0119] See also Figure 2 If the concave area is in the edge test area, the pressure point is determined according to the center point of the concave area to perform the pressure test:

[0120] If the position of the concave region is in the edge test area, the area of ​​the concave region is obtained;

[0121] Get the center point of the contact section, draw a straight line perpendicular to the contact section with the center point of the contact section, and record the intersection of the straight line and the outer surface of the helmet as the vertex;

[0122] A semicircle is made on the outer surface of the helmet through the vertex to divide the concave area equally. The semicircle contacts the contact section to form a pressure section. The line segment where the pressure section intersects the contact section is recorded as the interception line segment.

[0123] Obtain a straight line passing through the center point of the intercepted line segment and perpendicular to the intercepted line segment, and record the intersection of the straight line and the contact section contour as the third pressure point and the fourth pressure point;

[0124] Setting a second pressure threshold;

[0125] The second pressure threshold is the initial pressure strength, which is 10N by default, where N is the pressure unit;

[0126] Using a pressure device, taking the second pressure threshold as the initial pressure, and simultaneously applying continuous pressure to the first pressure point and the second pressure point toward the center of the contact cross section, the continuous pressure variation amplitude is m;

[0127] The change amplitude m is 1N;

[0128] The profile of the contact section of the helmet during the pressure test is monitored in real time by a camera;

[0129] When the contour of the contact cross section is not circular, the current applied force is recorded as the limit force.

[0130] The helmet test results are judged according to the threshold value:

[0131] Set collision eligibility threshold;

[0132] Get the area of ​​the concave region formed by the collision test;

[0133] If the area of ​​the concave region is greater than or equal to the collision qualified threshold, the current helmet test result is unqualified;

[0134] If the dented area is smaller than the collision pass threshold, the helmet is subjected to pressure testing;

[0135] Set the stress test pass threshold;

[0136] If the limit force in the helmet pressure test is greater than or equal to the pressure test pass threshold, the current helmet test result is qualified;

[0137] If the limit force in the helmet pressure test is less than the pressure test pass threshold, the current helmet test result is unqualified.

[0138] A system for implementing the helmet-based hardness testing method according to claim 1, comprising:

[0139] Test bench, used for crash and pressure testing by placing the helmet on the test bench;

[0140] The collision test module uses a collision test machine to collide the helmet at any angle to form a concave area;

[0141] The image detection module uses a camera to identify the contour and area of ​​the sunken area, and uses the camera to monitor in real time whether the helmet is deformed;

[0142] Pressure test module, using a hydraulic press to perform pressure tests on the pressure points of the helmet;

[0143] The data analysis module determines whether the helmet has passed the test by obtaining collision test data and pressure test data.

[0144] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0145] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A hardness test method based on a helmet, Features: include: Place the helmet mouth downward on the test bench; Divide the outer surface of the helmet into test areas; The inner surface of the helmet is the contact surface between the wearer's head and the helmet, and the outer surface of the helmet is the non-contact surface between the wearer's head and the helmet; The test area includes a central test area and an edge test area; Performing a collision test on the outer surface of the helmet at any angle to determine the location of the concave area formed by the collision test; According to the location of the sunken area, corresponding pressure points are selected for pressure testing; If the sunken area is in the central test area, the contour of the sunken area is obtained, the longest line segment in the contour of the sunken area is calculated, and a pressure point is selected for pressure testing according to the longest line segment in the contour of the sunken area; If the sunken area is in the central test area, the sunken area contour is obtained, the longest line segment in the sunken area contour is calculated, and a pressure point is selected for pressure testing according to the longest line segment in the sunken area contour: Select any point on the contour of the concave area as the base point, and select test points at intervals of length n along the clockwise direction, denoted as , , … , j represents the number of test points, when When the distance between the contour and the base point on the concave area contour is less than or equal to n, stop selecting; Randomly select two test points and calculate the distance between the test points, and enter the distance into the test point distance set; Select the two test points with the longest distance as the pressure direction nodes; Connect the pressure direction nodes to form a pressure line segment; In the plane where the concave contour is located, a straight line is drawn through the center point of the pressure line segment and is perpendicular to the pressure line segment, and the intersection of the straight line and the concave contour is recorded as the first pressure base point and the second pressure base point; A semicircle perpendicular to the contact cross section is made on the outer surface of the helmet through the first pressure base point and the second pressure base point, and the cross section formed by the contact between the semicircle and the contact cross section is recorded as the pressure cross section; Obtain the pressure section profile, select two points on the pressure section profile whose vertical distance to the contact section is zero, and record them as the first pressure point and the second pressure point; Setting a first pressure threshold; Using a pressure device, taking a first pressure threshold as an initial pressure, and simultaneously applying continuous pressure to the first pressure point and the second pressure point toward the center of the contact cross section, the continuous pressure variation amplitude being m; The profile of the contact section of the helmet during the pressure test is monitored in real time by a camera; When the profile of the contact cross section is not circular, the current applied force is recorded as the limit force; If the concave area is in the edge test area, the pressure point is determined according to the center point of the concave area for pressure testing; If the concave area is in the edge test area, the pressure point is determined according to the center point of the concave area to perform the pressure test: If the position of the concave region is in the edge test area, the area of ​​the concave region is obtained; Get the center point of the contact section, draw a straight line perpendicular to the contact section with the center point of the contact section, and record the intersection of the straight line and the outer surface of the helmet as the vertex; A semicircle is made on the outer surface of the helmet through the vertex to divide the concave area equally. The semicircle contacts the contact section to form a pressure section. The line segment where the pressure section intersects the contact section is recorded as the interception line segment. Obtain a straight line passing through the center point of the intercepted line segment and perpendicular to the intercepted line segment, and record the intersection of the straight line and the contact section contour as the third pressure point and the fourth pressure point; Setting a second pressure threshold; Using a pressure device, taking the second pressure threshold as the initial pressure, and simultaneously applying continuous pressure to the first pressure point and the second pressure point toward the center of the contact cross section, the continuous pressure variation amplitude is m; The profile of the contact section of the helmet during the pressure test is monitored in real time by a camera; When the profile of the contact cross section is not circular, the current applied force is recorded as the limit force; The helmet test results are judged according to the threshold value.

2. A helmet-based hardness testing method according to claim 1, Features: The outer surface of the helmet is divided into test areas: The helmet tested is a hemispherical helmet with a hemispherical radius of r; The contact surface formed between the helmet and the test bench is a circle with a radius of r, which is recorded as the contact cross section; A diameter is obtained on the contact section, which is recorded as the segmentation diameter. The segmentation diameter intersects the contour of the contact section at points a and b. Connecting point a and point b through the outer surface of the helmet, an arc is formed on the outer surface of the helmet, which is recorded as a segmentation arc, and the section formed by the segmentation arc and the segmentation diameter is perpendicular to the contact section, and the section formed by the segmentation arc and the segmentation diameter is recorded as the segmentation section; Get the split section contour, select two points on the split section contour that are perpendicular to the contact section. The points are recorded as the first segmentation point and the second segmentation point; Draw a circle parallel to the contact section through the first dividing point and the second dividing point on the outer surface of the helmet, and record the outline of the circle as the dividing line; Divide the outer surface of the helmet according to the dividing line; The area between the dividing line and the contact section contour is recorded as the edge test area; The area outside the edge test area is recorded as the central test area.

3. A helmet-based hardness testing method according to claim 1, Features: The helmet is subjected to a collision test at any angle to determine the location of the concave area formed by the collision test: If the sunken area is only in the central test area, mark the sunken area position in the central test area; If the sunken area is only in the edge test area, mark the sunken area position in the edge test area; If the concave region is in both the central test region and the edge test region, the concave region is segmented by a dividing line into a central concave region and an edge concave region.

4. A helmet-based hardness testing method according to claim 1, Features: The helmet test results are judged according to the threshold value: Set collision eligibility threshold; Get the area of ​​the concave region formed by the collision test; If the area of ​​the concave region is greater than or equal to the collision qualified threshold, the current helmet test result is unqualified; If the dented area is smaller than the collision pass threshold, the helmet is subjected to pressure testing; Set the stress test pass threshold; If the limit force in the helmet pressure test is greater than or equal to the pressure test pass threshold, the current helmet test result is qualified; If the limit force in the helmet pressure test is less than the pressure test pass threshold, the current helmet test result is unqualified.

5. A helmet-based hardness testing method according to claim 3, Features: If the area of ​​the central concave region is greater than or equal to the area of ​​the edge concave region, the marked concave region is located in the central test area; If the area of ​​the central recessed region is smaller than the area of ​​the edge recessed region, the marked recessed region is located in the edge test region.

6. A system for implementing the helmet-based hardness testing method according to claim 1, It is characterized in that include: Test bench, used for crash and pressure testing by placing the helmet on the test bench; The collision test module uses a collision test machine to collide the helmet at any angle to form a concave area; The image detection module uses a camera to identify the contour and area of ​​the sunken area, and uses the camera to monitor in real time whether the helmet is deformed; Pressure test module, using a hydraulic press to perform pressure tests on the pressure points of the helmet; The data analysis module determines whether the helmet has passed the test by obtaining collision test data and pressure test data.

Images