Power assembly vibration exciting force signal detection system
Through the powertrain vibration excitation force signal detection system, the vibration excitation force is converted into component deformation amount, solving the problem of the impact of suspended pad stiffness, realizing accurate vibration excitation force detection, and reducing testing costs.
Patent Information
- Application Number
- CN202422548881.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-22
- Publication Date
- 2025-09-05
- Estimated Expiration
- 2034-10-22
AI Technical Summary
In the prior art, the stiffness of the powertrain suspension pad has a great impact on the vibration test results, and it is impossible to accurately test the vibration excitation force in the axial, horizontal and vertical directions of the engine.
The powertrain vibration excitation force signal detection system is adopted, which includes a static signal calibration unit, a dynamic signal acquisition unit and an excitation force signal processing module. The vibration excitation force is converted into component deformation through a force sensor, and a standard press is used to reduce the influence of the stiffness of the suspended pad to achieve the accuracy of signal acquisition.
Signal acquisition is achieved without the influence of suspended pad stiffness, reducing testing costs, and the testing method is convenient and practical, and can accurately detect the vibration excitation force of the powertrain.
Smart Images
Figure CN223307855U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of engine testing, in particular to a powertrain vibration excitation force signal detection system. Background Art
[0002] During engine operation, periodic cylinder pressure will be generated in the cylinder. The powertrain suspension installation position will be periodically excited by the connecting rod to produce vibration, which will cause the powertrain to vibrate in the axial, horizontal and vertical directions on the vehicle installation base. If the engine vibration is too large, it will cause large vibration of the entire vehicle, poor comfort, and even cause vibration damage to the vehicle's own components. Therefore, it is necessary to detect the engine vibration excitation force during development.
[0003] Currently, the vibration acceleration measurement method using an accelerometer is usually used to test the vibration excitation force of the powertrain.
[0004] The defects of the prior art are:
[0005] The stiffness of the powertrain suspension pad has a significant impact on the results of the vibration test, making it impossible to accurately test the vibration excitation forces in the axial, horizontal, and vertical directions of the engine. Summary of the Invention
[0006] In response to the above-mentioned problems, the present utility model provides a powertrain vibration excitation force signal detection system, the purpose of which is to convert the powertrain vibration excitation force into component deformation; it is not affected by the stiffness of the suspension cushion, so that the signal acquisition is accurate; at the same time, it reduces the cost of use and makes the testing method convenient and practical.
[0007] In order to solve the above problems, the technical solution provided by the present invention is as follows:
[0008] The powertrain vibration excitation force signal detection system includes a static signal calibration unit, a dynamic signal acquisition unit, and an excitation force signal processing module, wherein:
[0009] The static signal calibration unit comprises a force sensor, a calibration support and a press; the static signal calibration unit is used to calibrate the strain of the force sensor under a standard force state;
[0010] The dynamic signal acquisition unit includes the force sensor, suspension support, suspension cushion and power assembly; the dynamic signal acquisition unit is used to collect the strain signal of the force sensor during the operation of the engine;
[0011] The excitation force signal processing module is used to access, collect and analyze the output signal of the static signal calibration unit and the output signal of the dynamic signal collection unit respectively.
[0012] Preferably, the force sensor is a cylindrical hollow structure; the number of the force sensors is 4;
[0013] The force sensor includes an upper support column, a lower support column and a circular flange; the upper support column is provided at the upper half of the force sensor, and a first through hole with a rectangular longitudinal section is provided in the vertical direction of the column; two first support columns with semi-arc outer surfaces are symmetrically provided on both sides of the first through hole; the lower support column is provided at the lower half of the force sensor, and a second through hole with a cross-section and four rectangular end faces of the cross is provided in the vertical direction of the column; four second support columns with semi-arc outer surfaces are symmetrically provided around the second through hole; the circular flange is provided at the upper and lower ends of the force sensor;
[0014] A uniaxial strain gauge is attached to the outer surface of each of the four second support columns of the lower support column; the attachment direction of the uniaxial strain gauge is parallel to the vertical direction of the second support column; every two uniaxial strain gauges symmetrically along the axis of the lower support column form a half-bridge circuit;
[0015] Two uniaxial strain gauges are respectively attached to the outer surfaces of the two first support columns of the upper support column; the two uniaxial strain gauges are arranged in a T shape.
[0016] Preferably, the calibration support is an L-shaped structure; the support base of the calibration support is installed on the press base; and the side plate of the calibration support is provided with 8 threaded holes for lateral installation of the force sensor.
[0017] Preferably, when the static signal calibration unit calibrates the vertical force, the force sensor on the static signal calibration unit is vertically installed on the press base through the lower support seat; when the static signal calibration unit calibrates the horizontal and axial forces, the force sensor on the static signal calibration unit is laterally installed on the side plate of the calibration support.
[0018] Preferably, the bottom of the force sensor of the dynamic signal acquisition unit is installed on the suspension support, and the suspension pad is installed on the top; the four force sensors are respectively arranged at the four bottom corners of the powertrain for supporting and installing the powertrain.
[0019] Preferably, the suspension support is a rectangular parallelepiped, the bottom of which is mounted on the test chamber base by bolts, and the upper part of which is mounted on the force sensor by bolts; the length, width and height of the suspension support are 200mm*200mm*600mm respectively; the material of the suspension support is Q235, and the number is four;
[0020] The suspension pad is in the shape of a rectangular parallelepiped, with the bottom mounted on the force sensor by bolts, and the top supporting the powertrain by bolts; the length, width and height of the suspension pad are 150mm*80mm*60mm respectively; the stiffness of the suspension pad is 150N / mm axially, 780N / mm horizontally, and 900N / mm vertically; the number of the suspension pads is four.
[0021] Compared with the prior art, the present invention has the following advantages:
[0022] 1. The present invention cleverly utilizes the principle of vibration force-component deformation, thereby converting the powertrain vibration excitation force into component deformation.
[0023] 2. Since the present invention simultaneously converts the deformation of the component into an excitation force through a standard press, the vibration excitation force signal of the powertrain is directly tested and measured, thereby being unaffected by the stiffness of the suspension cushion and accurately collecting the signal.
[0024] 3. The device of the utility model has an ingenious structure, low cost, and a solid and reliable signal. The calculation and analysis method of the powertrain vibration excitation force is ingeniously conceived, practical and convenient, which solves the technical problems in the industry and is easy to promote and use in the field of powertrain testing. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 This is a structural diagram of a powertrain vibration excitation force signal detection system according to a specific embodiment of the present utility model;
[0026] Figure 2 A schematic diagram of a force sensor according to a specific embodiment of the present invention;
[0027] Figure 3 It is a schematic diagram of vertical static calibration of a specific embodiment of the utility model;
[0028] Figure 4 This is a schematic diagram of the arrangement of the horizontal force sensor according to a specific embodiment of the present utility model;
[0029] Figure 5 This is a schematic diagram of the force-strain fitting curve of the axial channel of the force sensor according to a specific embodiment of the present invention;
[0030] Figure 6 A schematic diagram of the axial vibration excitation force of the main firing frequency orders of the force sensor of a specific embodiment of the present utility model;
[0031] Figure 7 This is a schematic diagram of the dynamic signal acquisition structure of a specific embodiment of the present utility model.
[0032] Wherein: 100. Force sensor, 200. Calibration support, 110. Upper support column, 120. Lower support column, 130. Circular flange, 111. First through hole, 112. First support column, 121. Second through hole, 122. Second support column, 123. Uniaxial strain gauge, 210. Support base, 220. Side plate, 310. Press base, 320. Press rod, 410. Lower support seat, 420. Upper bearing seat, R1. First uniaxial strain gauge, R2. Second uniaxial strain gauge, R3. Third uniaxial strain gauge, R4. Fourth uniaxial strain gauge, R5. Fifth uniaxial strain gauge, R6. Sixth uniaxial strain gauge, R7. Seventh uniaxial strain gauge, R8. Eighth uniaxial strain gauge DETAILED DESCRIPTION
[0033] The present invention is further illustrated below with reference to specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, modifications of various equivalent forms of the present invention made by those skilled in the art all fall within the scope defined by the claims attached to this application.
[0034] like Figure 1 As shown, the powertrain vibration excitation force signal detection system includes a static signal calibration unit, a dynamic signal acquisition unit and an excitation force signal processing module, wherein:
[0035] The static signal calibration unit includes a force sensor 100, a calibration support 200 and a press; the static signal calibration unit is used to calibrate the strain of the force sensor 100 under a standard force state.
[0036] The dynamic signal acquisition unit includes a force sensor 100, a suspension support, a suspension cushion and a power assembly; the dynamic signal acquisition unit is used to collect the strain signal of the force sensor 100 during the operation of the engine.
[0037] The excitation force signal processing module is used to access, collect and analyze the output signal of the static signal calibration unit and the output signal of the dynamic signal acquisition unit respectively.
[0038] It should be noted that the static signal calibration unit is used to calibrate the strain of the force sensor 100 under the standard force state, and obtain the relationship between the force and strain of the force sensor 100 in the axial, horizontal and vertical directions; the signal output by the static signal calibration unit is input into the excitation force signal processing module.
[0039] It should be noted that the dynamic signal acquisition unit is used to collect the strain signal of the force sensor 100 during the operation of the engine, and obtain the relationship between the strain signal of the force sensor 100 in the axial, horizontal and vertical directions and time in this state, which is expressed as follows:
[0040] Y(t)={(t0,με0),(t1,με1),......(t n ,με n )} (1)
[0041] Among them: με is used to characterize microstrain; με n Used to characterize the microstrain at the nth moment.
[0042] The signal output by the dynamic signal acquisition unit is input into the excitation force signal processing module.
[0043] It should be noted that the excitation force signal processing module analyzes and calculates the collected strain signals to generate the force signals of the main ignition orders of the powertrain, which can be expressed as follows:
[0044] F(i)={(o1,f0),(o2,f1),……(o6,f n )} (2)
[0045] Where i = 1, 2, 3, 4, 5, 6.
[0046] like Figure 2 As shown, it should be noted that the force sensor 100 is a cylindrical hollow structure; the number of the force sensors 100 is 4.
[0047] The force sensor 100 includes an upper support column 110, a lower support column 120 and a circular flange 130; the upper support column 110 is arranged in the upper half of the force sensor 100, and a first through hole 111 with a rectangular longitudinal section is opened in the vertical direction of the column; two first support columns 112 with semi-arc outer surfaces are symmetrically arranged on both sides of the first through hole 111; the lower support column 120 is arranged in the lower half of the force sensor 100, and a second through hole 121 with a cross-section and four rectangular end faces of the cross is opened in the vertical direction of the column; four second support columns 122 with semi-arc outer surfaces are symmetrically arranged around the second through hole 121; the circular flange 130 is arranged at the upper and lower ends of the force sensor 100.
[0048] A uniaxial strain gauge 123 is respectively adhered to the outer surface of the four second support columns 122 of the lower support column 120; the pasting direction of the uniaxial strain gauge 123 is parallel to the vertical direction of the second support column 122; every two uniaxial strain gauges 123 symmetrical along the axis of the lower support column 120 form a half-bridge circuit for testing axial and horizontal forces.
[0049] Two T-shaped uniaxial strain gauges 123 are respectively attached to the outer surfaces of the two first support columns 112 of the upper support column 110. A total of four uniaxial strain gauges 123 form a full-bridge circuit for testing vertical force.
[0050] It should be further explained that the circular flange 130 is used for fixed installation and is made of Q235.
[0051] It should be noted that the calibration support 200 is an L-shaped structure; the support base 210 of the calibration support 200 is installed on the press base 310; the side plate 220 of the calibration support 200 has 8 threaded holes for lateral installation of the force sensor 100.
[0052] It should be further explained that the calibration support 200 is used to calibrate the axial and horizontal forces of the force sensor, and its material is Q235.
[0053] In this specific embodiment, the model of the press is Zwick Z300E, with a maximum pressure of 30KN and an accuracy of 1N.
[0054] like Figure 3 、 Figure 4 As shown, it should be noted that when the static signal calibration unit calibrates the vertical force, the force sensor 100 on the static signal calibration unit is vertically installed on the press base 310 through the lower support seat 410; when the static signal calibration unit calibrates the horizontal and axial forces, the force sensor 100 on the static signal calibration unit is laterally installed on the side plate 220 of the calibration support 200.
[0055] In this specific embodiment, the system sampling rate of the static signal calibration unit is 64 Hz, and the system sampling time interval is 20 seconds to 50 seconds.
[0056] It should be noted that the dynamic signal acquisition unit's force sensor 100 is mounted on a suspension support at its base, with a suspension pad mounted above. Four force sensors 100 are located at the four corners of the powertrain to support the assembly. When the powertrain is operating, the force sensors 100 output four sets of strain signals in the axial, horizontal, and vertical directions, totaling 12 signals, which are input into the excitation force signal processing module.
[0057] In this specific embodiment, the system sampling rate of the dynamic signal acquisition unit is 1024 Hz, and the system sampling time interval is 20 seconds to 50 seconds.
[0058] It should be noted that the suspension support is a rectangular parallelepiped, the bottom of which is mounted on the laboratory base by bolts, and the force sensor 100 is mounted on the top by bolts; the length, width and height of the suspension support are 200mm*200mm*600mm respectively; the material of the suspension support is Q235, and there are four of them.
[0059] The suspension pad is in the shape of a rectangular parallelepiped, with the bottom mounted on the force sensor 100 by bolts and the top supporting the powertrain by bolts; the length, width and height of the suspension pad are 150mm*80mm*60mm respectively; the stiffness of the suspension pad is 150N / mm axially, 780N / mm horizontally, and 900N / mm vertically; there are four suspension pads.
[0060] A powertrain vibration excitation force signal detection method using a powertrain vibration excitation force signal detection system includes the following steps:
[0061] S100. Apply a standard force to the force sensor 100 of the static signal calibration unit through a press, measure the static strain signal set of the force sensor 100 under different standard forces in the axial, horizontal and vertical directions, and input the static strain signal set into the excitation force signal processing module.
[0062] S200. The dynamic signal acquisition unit acquires a set of dynamic strain signals in the axial, horizontal and vertical directions measured by the force sensor 100 on the dynamic signal acquisition unit during the operation of the engine, and outputs the set of dynamic strain signals to the excitation force signal processing module.
[0063] S300. After the excitation force signal processing module receives the output signals of the static signal calibration unit and the dynamic signal acquisition unit respectively, it analyzes and calculates the collected static strain signal set and dynamic strain signal set to generate the force signal of the main ignition order of the powertrain.
[0064] It should be noted that step S100 specifically includes the following steps:
[0065] S110. Install the current force sensor 100 and the lower support seat 410 on the press base 310 by bolts; form a full-bridge circuit with two groups of four uniaxial strain gauges 123 arranged in a T shape on the arc-shaped outer surface of the two first support columns 112 of the upper support column 110 of the force sensor 100 to output the strain signal in the vertical direction; the press rod 320 applies a first standard unit force on the upper bearing seat 420 above the force sensor 100; output the vertical direction output strain signal corresponding to the first standard unit force to the excitation force signal processing module.
[0066] The first standard unit force is expressed as follows:
[0067] F1=300n1 (3)
[0068] Wherein, F1 is used to represent the first standard unit force; n1 is used to represent the first multiplier of the first standard unit force, n1=0, 1…10.
[0069] The vertical output strain signal is expressed as follows:
[0070]
[0071] Among them, M V (F1) is used to represent the vertical output strain signal corresponding to the first standard unit force; Used to characterize each first standard unit force corresponding to each first multiplier; Used to characterize each vertical output strain signal corresponding to each first standard unit force.
[0072] S120. Install the calibration support 200 on the press base 310; install the force sensor 100 laterally on the calibration support 200 through the bolt connection of the lower support seat 410; form a half-bridge circuit with the first uniaxial strain gauge R1 and the third uniaxial strain gauge R3 on the lower support column 120 of the force sensor 100 to output the strain signal in the axial direction; apply a second standard unit force to the side of the upper bearing seat 420 above the force sensor 100; output the axial direction output strain signal corresponding to the second standard unit force to the excitation force signal processing module.
[0073] The second standard unit force is expressed according to formula 5:
[0074] F2=50n2 (5)
[0075] Wherein, F2 is used to represent the second standard unit force; n2 is used to represent the second multiplier of the second standard unit force, n2=0, 1…10.
[0076] The axial output strain signal is expressed as follows:
[0077]
[0078] Among them, M A (F2) is used to represent the axial output strain signal corresponding to the second standard unit force; Used to characterize each second standard unit force corresponding to each second multiplier; Used to characterize the output strain signal in each axial direction corresponding to each second standard unit force.
[0079] S130. Rotate the lower support seat 410 of the force sensor 100 90° clockwise and install it laterally on the calibration support 200 again with bolts; form a half-bridge circuit with the second uniaxial strain gauge R2 and the fourth uniaxial strain gauge R4 on the lower support column 120 of the force sensor 100 to output a strain signal in the horizontal direction; apply a third standard unit force to the side of the upper bearing seat 420 above the force sensor 100; output the horizontal output strain signal corresponding to the third standard unit force to the excitation force signal processing module.
[0080] The third standard unit force is expressed by formula 7:
[0081] F3=50n3 (7)
[0082] Among them, F3 is used to represent the third standard unit force; n3 is used to represent the third multiplier of the third standard unit force, n3=0, 1...10.
[0083] The horizontal output strain signal is expressed as follows:
[0084]
[0085] Among them, M H (F3) is used to represent the horizontal output strain signal corresponding to the third standard unit force; Used to characterize each third standard unit force corresponding to each third multiplier; Used to characterize each horizontal output strain signal corresponding to each third standard unit force.
[0086] S140. Switch to the next force sensor 100, and then execute steps S110 to S130 until the static calibration of the four force sensors 100 in the vertical, axial and horizontal directions of the static signal calibration unit is completed.
[0087] It should be further explained that in step S110, uniaxial strain gauges are pasted on the lower support column 120 of the force sensor 100, with the strain grid direction along the axial direction of the force sensor 100. One strain gauge is pasted on each support column, for a total of four gauges, which are marked as the first uniaxial strain gauge R1, the second uniaxial strain gauge R2, the third uniaxial strain gauge R3, and the fourth uniaxial strain gauge R4; two strain gauges are pasted on the upper support column 110 of the force sensor, with two strain gauges on each support column, for a total of four gauges, which are marked as the fifth uniaxial strain gauge R5, the sixth uniaxial strain gauge R6, the seventh uniaxial strain gauge R7, and the eighth uniaxial strain gauge R8, wherein the strain grid directions of the fifth uniaxial strain gauge R5 and the seventh uniaxial strain gauge R7 are along the axial direction of the force sensor, and the strain grid directions of the sixth uniaxial strain gauge R6 and the eighth uniaxial strain gauge R8 are along the arc direction of the support column, and are perpendicular to the seventh uniaxial strain gauge R7 and the fifth uniaxial strain gauge R5, respectively.
[0088] It should be noted that step S200 specifically includes the following steps:
[0089] S210. Install the lower support base 410 of the four force sensors 100 on the suspension support of the engine stand; install a suspension pad on the upper force bearing base 420 of the force sensor 100; install the powertrain on the suspension pad; output the axial, horizontal and vertical strain signals of the four groups of force sensors 100 to the excitation force signal processing module.
[0090] S220. Start the engine and collect a dynamic strain signal set; the dynamic strain signal set includes a total of 12 strain signals in the axial, horizontal and vertical directions of the four force sensors 100; after the dynamic strain signal set is collected, it is input into the excitation force signal processing module.
[0091] The dynamic strain signal set is expressed as follows:
[0092]
[0093] Where: M(t) is used to represent the dynamic strain signal set; t is used to represent the time parameter, the unit is second, and 20s≤t≤50s, the system sampling rate is 1024Hz; used to characterize the axial strain signal of the i-th force sensor 100; A strain signal for representing the horizontal direction of the i-th force sensor 100; Used to represent the strain signal of the i-th force sensor 100 in the vertical direction.
[0094] It should be noted that step S300 specifically includes the following steps:
[0095] S310: Perform point fitting on the static strain signal set input by the static signal calibration unit to generate a linear curve; the linear curve is expressed as follows:
[0096] F=K(M)+b (10)
[0097] Wherein: F is used to characterize the linear curve; M is used to characterize the strain of each force sensor 100 under a set of standard forces; K is used to characterize the fitting coefficient of each channel of the force sensor 100; b is used to characterize the fitting constant of each channel of the force sensor 100.
[0098] S320: Performing a fast Fourier transform point by point on the dynamic strain signal set input by the dynamic signal acquisition unit into a frequency domain signal, which is expressed as follows:
[0099]
[0100] Where: M k Used to represent the Fourier coefficient set; L is used to represent the signal M k The number of; m is used to represent the Fourier analysis frequency set, Δf is used to characterize the frequency resolution and is set to 1 Hz.
[0101] S330: Calculate the order frequency of the main ignition excitation force of the engine, expressed as Equation 12:
[0102] O i=n×c×i / 120,i=1,2,3,4 (12)
[0103] Where: n is used to represent the engine speed in revolutions per minute; c is used to represent the number of cylinders in a four-stroke engine; and i is used to represent the main ignition order.
[0104] S340: Extracting the strain signal of the main firing order from the frequency domain signal.
[0105] S350: Calculate and output the excitation force signal of the main ignition order of the powertrain, expressed as follows:
[0106]
[0107] Among them: k1, k2, k3, and k4 are used to characterize the fitting coefficients of the four force sensors 100, and the superscripts A, H, and V represent the axial, horizontal, and vertical directions, respectively; b1, b2, b3, and b4 are used to characterize the fitting constants of the four force sensors 100, and the superscripts A, H, and V represent the axial, horizontal, and vertical directions, respectively; Z1, Z2, Z3, and Z4 are used to characterize the Fourier transform data of the strain signals collected by the four force sensors 100, and the superscripts A, H, and V represent the axial, horizontal, and vertical directions, respectively.
[0108] Then, a vibration excitation force signal is generated at the main firing order frequency of the powertrain.
[0109] In the foregoing detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that embodiments of the claimed subject matter require more features than are clearly recited in each claim. On the contrary, as reflected in the appended claims, the invention comprises less than all the features of any individual disclosed embodiment. The appended claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.
[0110] The above description of the disclosed embodiments is intended to enable any person skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments without departing from the spirit and scope of the present disclosure. Therefore, the present disclosure is not limited to the embodiments presented herein but is intended to be consistent with the broadest scope of the principles and novel features disclosed herein.
[0111] The foregoing description includes examples of one or more embodiments. Of course, it is not possible to describe all possible combinations of components or methods for the purposes of describing the above embodiments, but one of ordinary skill in the art will recognize that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to encompass all such changes, modifications and variations that fall within the scope of the appended claims. Furthermore, to the extent the term "comprising" is used in the specification or claims, the term is intended to be encompassed in a manner similar to the term "including," as explained in terms of "including," used as a transitional word in the claims. Furthermore, any use of the term "or" in the specification of the claims is intended to mean a "non-exclusive or."
[0112] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only a specific implementation method of the utility model and is not intended to limit the scope of protection of the utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the utility model should be included in the scope of protection of the utility model.
Claims
1. A powertrain vibration excitation force signal detection system, characterized by: It includes a static signal calibration unit, a dynamic signal acquisition unit and an excitation force signal processing module, wherein: The static signal calibration unit comprises a force sensor (100), a calibration support (200) and a press; the static signal calibration unit is used to calibrate the strain of the force sensor (100) under a standard force state; The dynamic signal acquisition unit comprises the force sensor (100), a suspension support, a suspension cushion, and a power assembly; the dynamic signal acquisition unit is used to acquire the strain signal of the force sensor (100) during the operation of the engine; The excitation force signal processing module is used to access, collect and analyze the output signal of the static signal calibration unit and the output signal of the dynamic signal collection unit respectively.
2. The powertrain vibration excitation force signal detection system according to claim 1, characterized in that: The force sensor (100) is a cylindrical hollow structure; the number of the force sensors (100) is four; The force sensor (100) comprises an upper support column (110), a lower support column (120) and a circular flange (130); the upper support column (110) is provided at the upper half of the force sensor (100), and a first through hole (111) with a rectangular longitudinal section is provided in the vertical direction of the column; two first support columns (112) with semi-arc outer surfaces are symmetrically provided on both sides of the first through hole (111); the lower support column (120) is provided at the lower half of the force sensor (100), and a second through hole (121) with a cross-section and four rectangular end faces of the cross is provided in the vertical direction of the column; four second support columns (122) with semi-arc outer surfaces are symmetrically provided around the second through hole (121); the circular flange (130) is provided at the upper and lower ends of the force sensor (100); A uniaxial strain gauge (123) is respectively attached to the outer surface of the four second support columns (122) of the lower support column (120); the attachment direction of the uniaxial strain gauge (123) is parallel to the vertical direction of the second support column (122); and every two uniaxial strain gauges (123) symmetrically arranged along the axis of the lower support column (120) form a half-bridge circuit; Two uniaxial strain gauges (123) are respectively adhered to the outer surfaces of the two first support columns (112) of the upper support column (110); the two uniaxial strain gauges (123) are arranged in a T-shape.
3. The powertrain vibration excitation force signal detection system according to claim 2, characterized in that: The calibration support (200) is an L-shaped structure; the support base (210) of the calibration support (200) is installed on the press base (310); and the side plate (220) of the calibration support (200) is provided with 8 threaded holes for lateral installation of the force sensor (100).
4. The powertrain vibration excitation force signal detection system according to claim 3, characterized in that: When the static signal calibration unit calibrates vertical force, the force sensor (100) on the static signal calibration unit is vertically mounted on the press base (310) via a lower support seat (410); when the static signal calibration unit calibrates horizontal and axial force, the force sensor (100) on the static signal calibration unit is laterally mounted on the side plate (220) of the calibration support (200).
5. The powertrain vibration excitation force signal detection system according to claim 4, characterized in that: The bottom of the force sensor (100) of the dynamic signal acquisition unit is mounted on the suspension support, with the suspension cushion mounted on top; four force sensors (100) are respectively arranged at the four bottom corners of the powertrain for supporting and mounting the powertrain.
6. The powertrain vibration excitation force signal detection system according to claim 5, characterized in that: The suspension support is a rectangular parallelepiped, the bottom of which is mounted on the test chamber base by bolts, and the upper part of which is mounted on the force sensor (100) by bolts; the length, width and height of the suspension support are 200mm*200mm*600mm respectively; the material of the suspension support is Q235, and the number is four; The suspension pad is in the shape of a rectangular parallelepiped, with the bottom being mounted on the force sensor (100) via bolts, and the top supporting the power assembly via bolts; the length, width and height of the suspension pad are 150 mm*80 mm*60 mm respectively; the stiffness of the suspension pad is 150 N / mm in the axial direction, 780 N / mm in the horizontal direction and 900 N / mm in the vertical direction; and the number of the suspension pads is four.