Torque control system, torsional excitation device and power control module
By combining a torque control system and a torsional excitation device, and using electrical signals to control the output dynamic torque of the drive shaft, the problem of the inability to accurately simulate the multi-frequency torque of rotating machinery in existing technologies is solved, and precise dynamic torque simulation and performance evaluation of rotating machinery are realized.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- THE 711TH RES INST OF CHINA STATE SHIPBUILDING CORP
- Filing Date
- 2022-10-12
- Publication Date
- 2026-05-12
AI Technical Summary
Existing dynamometers are unable to effectively simulate the multi-frequency dynamic torques experienced by rotating machinery under real operating conditions, leading to vibration and noise problems. Furthermore, existing technologies cannot accurately simulate the dynamic torque spectrum required in practice.
By employing a torque control system and a torsional excitation device, and through a torque sensor and a weighted coefficient controller, combined with the magnetic and excitation components in the torsional excitation device, the transmission shaft outputs dynamic torque using electrical signals, thereby simulating multi-frequency torque.
It enables precise dynamic torque simulation of rotating machinery, allowing us to examine its performance at various frequencies, reducing vibration and noise hazards, and improving safety and performance.
Smart Images
Figure CN115629629B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of rotating machinery technology, specifically to a torque control system, a torsional vibration excitation device, and a power control module. Background Technology
[0002] In many tests on rotating machinery such as internal combustion engines, electric motors, rotary pumps, gearboxes, and propellers, various dynamometers are used, including electric dynamometers, eddy current dynamometers, magnetic particle dynamometers, hydraulic dynamometers, and load motors. Some of these dynamometers simulate the load end of the test object, while others serve as the power source for the test object, rotating alongside or driving it and providing a stable torque as required. However, the torque experienced by the aforementioned rotating machinery under actual operating conditions includes not only a stable component (average value) of a certain amplitude, but also fluctuating torque or dynamic torque with various frequency components. These fluctuating components not only cause torsional vibrations in the rotating machinery, leading to various complex vibrations and noises, but also pose potential safety and performance risks such as fatigue and wear.
[0003] Therefore, how to simulate these dynamic torques during the testing of rotating machinery in order to examine their performance and diagnose related defects and faults has become an urgent problem to be solved.
[0004] Some existing dynamometers can superimpose one or two single-frequency dynamic torques into the output torque; however, this differs significantly from the number and type of spectral lines that actually need to be simulated, and thus cannot effectively solve the aforementioned problem. Summary of the Invention
[0005] The purpose of this application is to provide a torque control system, a torsional excitation device, and a power control module for simulating dynamic torque, combining it with the output torque of a dynamometer, and outputting it to the device under test to examine the performance of the device under test.
[0006] To achieve the above objectives, this application provides the following technical solution:
[0007] A torque control system is provided for controlling a torsional vibration excitation device, the torsional vibration excitation device having a drive shaft and being fixedly connected to the shaft of a dynamometer via the drive shaft, wherein one end of the dynamometer shaft opposite to the drive shaft is connected to the rotation shaft of a test device, the torque control system comprising:
[0008] The control module, electrically connected to the torsional vibration excitation device, converts a reference signal into a control signal and outputs it to the torsional vibration excitation device; and
[0009] A torque sensor, electrically connected to the control module, is used to be mounted on the shaft of the dynamometer to collect an actual torque signal; it is also used to be mounted on the torsional excitation device to collect the actual torque signal output by the combination of the dynamometer and the torsional excitation device and to collect an actual torque signal.
[0010] In the control module, the actual torque signal is compared with a target dynamic torque to obtain an error signal, the control signal is updated according to the error signal, and then output to the torsional vibration device.
[0011] In some embodiments of this application, the torque control system further includes a weighting coefficient controller, which converts the reference signal into the control signal;
[0012] The weighted coefficient controller has a weighted coefficient vector W(n), and W(n) = [w1(n), w2(n), ..., w m (n)] T ;
[0013] The reference signal has a reference signal vector X(n), and X(n) = [x(n), x(n-1), ..., x(n-m+1)] T ;
[0014] n represents time, n+1 represents the next time step of n, n-1 represents the previous time step of n, and m is a positive integer;
[0015] The value of the control signal at time n is y(n), and y(n) = W(n). T X(n).
[0016] In some embodiments of this application, the weight coefficient controller updates the weight coefficient vector according to W(n+1)=W(n)+2μe(n)X'(n), where μ is the update step size of the weight coefficient vector W(n), and X'(n) is obtained by transforming the reference signal through a transfer function.
[0017] To achieve the above objectives, this application also provides the following technical solutions:
[0018] A torsional vibration excitation device employs the aforementioned torque control system, and the torsional vibration excitation device includes a magnetizing component, an excitation component, and a drive shaft;
[0019] The magnetizing element and the excitation element are arranged opposite to each other and are both arranged around the circumference of the transmission shaft. At most one of the magnetizing element and the excitation element is fixedly connected to the transmission shaft.
[0020] The magnetizing element is electrically connected to the control module in the torque control system. The control module outputs an electrical signal to the magnetizing element, thereby generating a magnetic force between the magnetizing element and the excitation element. Consequently, the magnetizing element or the excitation element rotates relative to each other and outputs torque to the transmission shaft.
[0021] In some embodiments of this application, the magnetic component includes a core and a coil;
[0022] The core is arranged circumferentially around the drive shaft, and the coil is wound on the surface of the core and electrically connected to the control module in the torque control system.
[0023] In some embodiments of this application, the excitation element includes multiple elements, all of which are arranged around the circumference of the transmission shaft and spaced apart.
[0024] The coils comprise multiple coils, all of which are arranged at intervals around the circumference of the drive shaft.
[0025] In some embodiments of this application, the excitation element includes at least one first excitation element and / or at least one second excitation element;
[0026] The first excitation element is located on the side of the excitation element that is away from the drive shaft;
[0027] The second excitation element is located between the excitation element and the drive shaft.
[0028] In some embodiments of this application, each of the first excitation elements and each of the second excitation elements are arranged opposite to each other.
[0029] In some embodiments of this application, the torsional vibration device further includes a first bearing, a first connector, a second connector, and a spring;
[0030] The first bearing includes a fixed part and a movable part movably connected to the fixed part;
[0031] The fixed part of the first bearing and the first connecting member are respectively fixedly connected to the transmission shaft, the movable part of the first bearing is fixedly connected to the second connecting member, the spring is connected between the first connecting member and the second connecting member, the second connecting member is fixedly connected to the excitation member, the first excitation member is fixedly connected to the first connecting member, and the second excitation member is fixedly connected to the fixed part of the first bearing.
[0032] Alternatively, the fixed part of the first bearing and the second connecting member are respectively fixedly connected to the transmission shaft, the movable part of the first bearing is fixedly connected to the first connecting member and the second excitation member respectively, the spring is connected between the first connecting member and the second connecting member, the second connecting member is fixedly connected to the excitation member, and the first excitation member is fixedly connected to the first connecting member.
[0033] In some embodiments of this application, the torsional vibration device further includes a support and a support bearing;
[0034] The bracket bearings include two and are both connected to the bracket. The bracket is used to fix the torsional vibration device. The two ends of the transmission shaft away from the magnetizing element and the excitation element are respectively rotatably connected to one of the bracket bearings.
[0035] To achieve the above objectives, this application also provides the following technical solutions:
[0036] A power control module, the power control module comprising the torsional vibration excitation device, dynamometer and test device described above;
[0037] The dynamometer includes:
[0038] The casing has an inner cavity; and
[0039] A second bearing, fixedly mounted on the housing; and
[0040] A shaft, passing through the housing and the inner cavity, and movably connected to the housing via the second bearing, has one end fixedly connected to one end of the longitudinal direction of the drive shaft in the torsional vibration device; and
[0041] A dynamometer module is located in the inner cavity and connected to the machine shaft, and is used to apply torque to the machine shaft.
[0042] The device under test has a rotating shaft, one end of which is fixedly connected to the end of the dynamometer shaft opposite to the drive shaft; or, one end of the rotating shaft is fixedly connected to the end of the drive shaft opposite to the dynamometer shaft.
[0043] In some embodiments of this application, the test device is one of an internal combustion engine, an electric motor, a pump, a gearbox, or a propeller.
[0044] Compared with the prior art, the technical solution of this application has the following beneficial effects:
[0045] 1. The torque control system provided in this application can control a torsional vibration device to output dynamic torque through electrical signal control, and continuously update the weight coefficient vector through the weight coefficient controller, so that the deviation between the actual output dynamic torque and the set dynamic torque is very small.
[0046] 2. The torsional vibration device provided in this application, using the above-mentioned torque control system, can realize the output of dynamic torque with multiple frequency components and be used for various experimental purposes; for example, to apply interference to the rotating shaft of rotating machinery to examine the anti-interference performance of rotating machinery and other performance under actual working conditions.
[0047] 3. The power control module provided in this application allows the rotating shaft of the test device to drive the shaft of the dynamometer, which in turn drives the transmission shaft of the torsional vibration device. Simultaneously, the dynamometer can provide load torque, and the torsional vibration device applies a target dynamic torque to the transmission shaft. This target dynamic torque is transmitted to the test device. The torque sensor measures the load torque of the dynamometer combined with the dynamic torque provided by the torsional vibration device, so that the test personnel can examine the performance of the test device when faced with dynamic torques of multiple frequencies.
[0048] 4. In the power control module provided in this application, the shaft of the dynamometer simultaneously drives the rotating shaft of the device under test and the transmission shaft of the torsional vibration device. The torsional vibration device applies a target dynamic torque to the transmission shaft, which is transmitted to the device under test. The torque sensor measures the combination of the driving torques of the dynamometer, that is, the dynamic torque provided by the torsional vibration device. Attached Figure Description
[0049] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0050] Figure 1 A schematic block diagram of the torque control system provided in Embodiment 1 of this application;
[0051] Figure 2 A schematic diagram of the axial structure of the torque excitation device provided in the first embodiment of this application;
[0052] Figure 3 A schematic diagram of the axial structure of the torque excitation device provided in the second embodiment of this application;
[0053] Figure 4 A cross-sectional view of a torque-excited vibration device is provided for the third embodiment of this application;
[0054] Figure 5 A cross-sectional view of the torque excitation device provided in the fourth embodiment of this application;
[0055] Figure 6 This is a cross-sectional view of the dynamometer provided in Embodiment 3 of this application.
[0056] The main reference numerals in the drawings of this application are explained as follows:
[0057] 1-Torsion excitation device; 11-Magnetic component; 111-Core; 112-Coil; 12-Excitation component; 121-First excitation component; 122-Second excitation component; 13-Drive shaft; 14-First bearing; 141-Fixed part; 142-Moving part; 15-First connector; 16-Second connector; 17-Spring; 18-Bracket; 19-Bracket bearing;
[0058] 2-Dynamometer; 21-Casing; 22-Second bearing; 23-Shaft;
[0059] 3-Connector. Detailed Implementation
[0060] The technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0061] This application provides a torque control system, a torsional vibration excitation device, and a power control module, which are described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, in the following embodiments, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.
[0062] Example 1
[0063] like Figure 1As shown in some embodiments of this application, a torque control system is provided for controlling a torsional excitation device. The torsional excitation device has a drive shaft and is fixedly connected to the shaft of a dynamometer via the drive shaft. One end of the dynamometer shaft opposite to the drive shaft is connected to the rotation shaft of a test device. The torque control system includes: a control module electrically connected to the torsional excitation device, which converts a reference signal into a control signal and outputs it to the torsional excitation device; and a torque sensor electrically connected to the control module, which is mounted on the shaft of the dynamometer and collects an actual torque signal y'(n) output by the combination of the dynamometer and the torsional excitation device. In the control module, the actual torque signal y'(n) is compared with a target dynamic torque d(n) to obtain an error signal e(n), the control signal y(n) is updated according to the error signal e(n), and then output to the torsional excitation device. Specifically, the target dynamic torque refers to data or signals obtained from outside the torque control system, which can be understood as input data or input signals to the torque control system. The torque control system controls the torsional vibration device in the manner described above, so that the dynamic torque output to the torsional vibration device is sufficiently accurate and as close as possible to the target dynamic torque.
[0064] Specifically, the end of the dynamometer shaft opposite to the torsional vibration excitation device is fixedly connected to the rotating shaft of a device under test. The torque sensor is disposed on the side of the dynamometer shaft near the device under test to more accurately measure the combined torque borne by the device under test. It is understood that for constant speed operation, the torque at any point along the dynamometer shaft can be considered the same. However, when the shaft rotates at a variable speed, inertial forces will cause different torques between two points along the dynamometer shaft. Therefore, placing the torque sensor on the end of the dynamometer shaft near the device under test yields more accurate test results. Of course, in some embodiments of this application, the torque sensor can be disposed on the rotating shaft of the device under test to obtain even more accurate test results. Specifically, the device under test includes one of an internal combustion engine, an electric motor, a pump, a gearbox, or a propeller.
[0065] Understandably, the torque control system sends the control signal to the torsional vibration device, causing the torsional vibration device to output dynamic torque according to the target dynamic torque. The error signal reflects the difference between the actual torque signal measured by the torque sensor and the target dynamic torque signal, thereby correcting the deviation between the two to achieve precise control of the torsional vibration device.
[0066] It is understood that the reference signal can be the target dynamic torque d(n), a speed signal measured by a speed sensor, or a combination of the target dynamic torque d(n) and the speed signal measured by the speed sensor. Specifically, the speed sensor is electrically connected to the control module and is mounted on the shaft of the dynamometer to collect the speed signal of the dynamometer shaft and the speed signal of the rotating shaft of the device under test.
[0067] like Figure 1 As shown, in some embodiments of this application, the torque control system further includes a weighted coefficient controller, which converts the reference signal x(n) into the control signal y(n); the weighted coefficient controller has a weighted coefficient vector W(n), and W(n) = [w1(n), w2(n), ..., w m (n)] T The reference signal x(n) has a reference signal vector X(n), and X(n) = [x(n), x(n-1), ..., x(n-m+1)]. T ; n represents time, n+1 represents the next time after n, n-1 represents the previous time before n, and m is a positive integer; the value of the control signal at time n is y(n), and y(n) = W(n). T X(n). It can be understood that the aforementioned reference signal x(n), control signal y(n), actual torque signal y'(n), target dynamic torque d(n), and error signal e(n) are all instantaneous values; the weighting coefficient vector W(n) consists of m different values w1(n), w2(n), ..., w at the same time. m The vector W(n+1) consists of n values used to synchronously update the vector W(n+1).
[0068] like Figure 1 As shown, in some embodiments of this application, the weight coefficient controller updates the weight coefficient vector according to W(n+1) = W(n) + 2μe(n)X'(n), where μ is the update step size of the weight coefficient vector W(n), i.e., the magnitude of the update of W(n) to W(n+1); X'(n) is obtained by transforming the reference signal x(n) through a transfer function. It can be understood that the transfer function is set according to the actual structure from the torsional excitation device to the torque sensor.
[0069] It is understood that the torque control system can use the torque signal measured by the torque sensor to adjust the output torque of the torsional vibration device in real time, with the target dynamic torque as the objective, so as to accurately reproduce the target dynamic torque.
[0070] Example 2
[0071] like Figures 2 to 5 As shown, a torsional vibration device 1 employs a torque control system as described in Embodiment 1, and the torsional vibration device 1 includes a magnetizing element 11, an excitation element 12, and a drive shaft 13; the magnetizing element 11 and the excitation element 12 are arranged opposite to each other and are both arranged around the circumference of the drive shaft 13, and at most one of the magnetizing element 11 and the excitation element 12 is fixedly connected to the drive shaft 13; the magnetizing element 11 is electrically connected to the control module in the torque control system, and the control module outputs an electrical signal to the magnetizing element 11, thereby generating a magnetic force between the magnetizing element 11 and the excitation element 12, thereby causing the magnetizing element 11 or the excitation element 12 to rotate and output torque to the drive shaft 13. Specifically, the control module in the torque control system outputs an electrical signal to the magnetizing element 11. This electrical signal can be alternating current. Under the influence of the magnetic field provided by the excitation element 12, the magnetizing element 11 is subjected to a force and tends to rotate circumferentially around the transmission shaft 13. At the same time, the excitation element 12 itself is also subjected to a reaction force and also tends to rotate circumferentially around the transmission shaft 13. When the magnetizing element 11 is fixedly connected to the transmission shaft 13, the magnetizing element 11 applies a dynamic torque to the transmission shaft 13. When the excitation element 12 is fixedly connected to the transmission shaft 13, the excitation element 12 applies a dynamic torque to the transmission shaft 13. In this way, the torsional vibration device can apply a dynamic torque to the transmission shaft 13.
[0072] like Figure 2 and Figure 3 As shown in some embodiments of this application, the magnetic component 11 includes a core 111 and a coil 112; the core 111 is arranged circumferentially around the transmission shaft 13, and the coil 112 is wound around the surface of the core 111 and electrically connected to the control module in the torque control system. It is understood that the specific shape and size of the core 111, the specific number of turns of the coil 112, and the diameter of each wire in the coil 112 can all be selected and adjusted according to actual needs.
[0073] like Figure 2 and Figure 3 As shown, in some embodiments of this application, the excitation element 12 includes multiple units, all of which are arranged around the circumference of the transmission shaft 13 and spaced apart; the coil 112 includes multiple units, all of which are arranged around the circumference of the transmission shaft 13 and spaced apart; the above design allows the coil 112 to be uniformly affected by magnetic force, so as to smoothly and steadily provide dynamic torque to the transmission shaft 13.
[0074] like Figure 2 and Figure 3As shown, in some embodiments of this application, the excitation element 12 includes at least one first excitation element 121 and / or at least one second excitation element 122; the first excitation element 121 is located on the side of the excitation element 11 away from the drive shaft 13; the second excitation element 122 is located between the excitation element 11 and the drive shaft 13.
[0075] like Figure 2 As shown, in some embodiments of this application, the torsional excitation device 1 simultaneously includes multiple first excitation elements 121 and multiple second excitation elements 122; for example... Figure 3 As shown, in some embodiments of this application, the torsional vibration device 1 includes only a plurality of first excitation elements 121. It is understood that when the excitation element 12 includes both first excitation elements 121 and second excitation elements 122, a more stable magnetic field can be provided to the excitation element 11, thereby enabling more reliable application of dynamic torque to the transmission shaft 13. Of course, in some embodiments of this application, the excitation element 12 may only include the second excitation element 122, which can also apply torque to the transmission shaft 13.
[0076] like Figure 2 As shown, in some embodiments of this application, each of the first excitation element 121 and each of the second excitation elements 122 are arranged opposite to each other to improve a more stable and powerful magnetic field, so that the excitation element 11 is subjected to a more stable and concentrated magnetic force, thereby enabling the transmission shaft 13 to smoothly receive dynamic torque.
[0077] like Figure 4 and Figure 5 As shown, in some embodiments of this application, the torsional vibration device 1 further includes a first bearing 14, a first connecting member 15, a second connecting member 16, and a spring 17. For example... Figure 4 As shown, the first bearing 14 includes a fixed portion 141 and a movable portion 142 movably connected to the fixed portion 141. The fixed portion 141 and the first connecting member 15 of the first bearing 14 are respectively fixedly connected to the transmission shaft 13. The movable portion 142 of the first bearing 14 is fixedly connected to the second connecting member 16. The spring 17 is connected between the first connecting member 15 and the second connecting member 16. The second connecting member 16 is fixedly connected to the excitation element 11. The first excitation element 121 is fixedly connected to the first connecting member 15. The second excitation element 122 is fixedly connected to the fixed portion 141 of the first bearing 14. The torque control system provides an electrical signal to the excitation element 11. The excitation element 11 is subjected to force in the magnetic field emitted by the first excitation element 121 and the second excitation element 122, generating a torque that rotates circumferentially along the transmission shaft 13. This torque is transmitted to the transmission shaft 13 via the second connecting member 16, the spring 17, and the first connecting member 15.
[0078] like Figure 5 As shown, in some other embodiments of this application, the fixed portion 141 of the first bearing 14 and the second connecting member 16 are respectively fixedly connected to the transmission shaft 13, the movable portion 142 of the first bearing 14 is respectively fixedly connected to the first connecting member 15 and the second excitation member 122, the spring 17 is connected between the first connecting member 15 and the second connecting member 16, the second connecting member 16 is fixedly connected to the excitation member 11, and the first excitation member 121 is fixedly connected to the first connecting member 15. The torque control system provides an electrical signal to the excitation member 11, and the excitation member 11 is subjected to force in the magnetic field emitted by the first excitation member 121 and the second excitation member 122, generating a torque that rotates circumferentially along the transmission shaft 13. This torque is transmitted to the transmission shaft 13 via the second connecting member 16.
[0079] Specifically, in some embodiments of this application, the size, model, material, and stiffness coefficient of the spring 17 can be selected and adjusted according to the actual situation.
[0080] like Figure 4 and Figure 5 As shown in some embodiments of this application, the torsional vibration device 1 further includes a bracket 18 and bracket bearings 19; the bracket bearings 19 include two bearings, both of which are connected to the bracket 18. The bracket is used to fix the torsional vibration device, and the two ends of the transmission shaft 13 axially away from the magnetizing element 11 and the excitation element 12 are respectively rotatably connected to one of the bracket bearings 19. It can be understood that the bracket 18 is placed on the ground, so that the weight of the torsional vibration device is supported on the ground.
[0081] In some embodiments of this application, the drive shaft 13 may be a hollow shaft to reduce its weight, thereby reducing the power consumption of the torsional vibration device 1.
[0082] Example 3
[0083] In some embodiments of this application, a power control module includes a torsional vibration excitation device 1, a dynamometer 2, and a test device as described in Embodiment 2.
[0084] like Figure 6As shown, in some embodiments of this application, the dynamometer 2 includes: a housing 21 having an inner cavity; a second bearing 22 fixedly mounted on the housing 21; a shaft 23 passing through the housing 21 and the inner cavity, and movably connected to the housing 21 via the second bearing 22, one end of which is fixedly connected to one end of the transmission shaft 13 in the torsional vibration device 1 along its longitudinal direction; and a dynamometer module (not shown), disposed in the inner cavity and connected to the shaft 23, for applying torque to the shaft 23.
[0085] The device under test has a rotating shaft, one end of which is fixedly connected to the end of the dynamometer 2's shaft 23 opposite to the drive shaft 13. In the power control module, the torque control system and the torsional vibration excitation device 1 are integrated through hardware and software to accurately simulate the torque state of the device under test under actual operating conditions, thus facilitating the examination of the device's performance under complex dynamic torque with multiple frequencies. It is understood that, using the above connection method, the dynamometer and torsional vibration excitation device can be combined into one unit, housed within the same casing, and manufactured as a single entity. In this case, the combination of the dynamometer and torsional vibration excitation device can be specifically used for torque loading tests on the device under test.
[0086] In another embodiment of this application, one end of the rotating shaft is fixedly connected to one end of the drive shaft 13 that is away from the shaft of the dynamometer. It is understood that for some dynamometers where one end of the shaft is sealed inside the engine compartment by a cover plate, the above connection method can solve the inconvenience of "only one end of the dynamometer's shaft is exposed, thus it can only be connected to the aforementioned torsional vibration excitation device." In this case, connecting the rotating shaft of the device under test to the end of the drive shaft 13 of the torsional vibration excitation device that is away from the shaft of the dynamometer can overcome the above problem. Furthermore, the above connection method also allows for the independent manufacture and storage of the torsional vibration excitation device and the dynamometer, combining them only when needed. When other uses are required, the two machines can be used separately for other purposes, thus offering advantages such as convenience, flexibility, and easy disassembly and assembly.
[0087] Obviously, the power control module provided in this application can combine the dynamometer and the torsional vibration device into one unit in various specific implementations according to different usage scenarios and needs, or it can be manufactured as an independent separate unit and the shafts of the two can be connected only when needed to load the device under test.
[0088] Specifically, the end of the dynamometer shaft opposite to the torsional vibration excitation device is fixedly connected to the rotating shaft of a device under test. The torque sensor is disposed on the side of the dynamometer shaft near the device under test to more accurately measure the combined torque borne by the device under test. It is understood that for constant speed operation, the torque at any point along the dynamometer shaft can be considered the same. However, when the shaft rotates at a variable speed, inertial forces will cause different torques between two points along the dynamometer shaft. Therefore, placing the torque sensor on the end of the dynamometer shaft near the device under test yields more accurate test results. Of course, in some embodiments of this application, the torque sensor can be disposed on the rotating shaft of the device under test to obtain even more accurate test results.
[0089] In some embodiments of this application, the test device is one of an internal combustion engine, an electric motor, a pump, a gearbox, or a propeller. In other embodiments, it may be other rotating machinery. The power control module provided in this application can be used to experimentally examine the torque performance of various rotating machinery.
[0090] In some embodiments of this application, the drive shaft 13 and the machine shaft 23 are connected by a connector 3, and the specific model and size of the connector 3 can be selected and adjusted according to actual needs.
[0091] In some embodiments of this application, when the shaft 23 of the dynamometer 2 drives the transmission shaft 13 of the torsional vibration device 1 to rotate, the spring 17 can rotate along with the transmission shaft 13, along with the excitation element 11 or the magnetizing element 12 which is fixedly connected to the movable part 142 of the first bearing 14.
[0092] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of protection of the claims. Furthermore, specific examples have been used in the specification to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application, and the content of this specification should not be construed as a limitation of this application.
Claims
1. A power control module, characterized in that, The power control module adopts a torque control system and includes a torsional vibration excitation device, a dynamometer, and a device under test. The dynamometer includes: The casing has an inner cavity; and The second bearing is fixed to the housing; and A shaft, passing through the housing and the inner cavity, and movably connected to the housing via the second bearing, has one end fixedly connected to one end of the longitudinal direction of the drive shaft in the torsional vibration device; and A dynamometer module is located in the inner cavity and connected to the machine shaft, and is used to apply torque to the machine shaft. The device under test has a rotating shaft, one end of which is fixedly connected to the end of the dynamometer shaft opposite to the drive shaft; the device under test is one of an internal combustion engine, an electric motor, a pump, a gearbox, or a propeller; The torsional vibration excitation device has a drive shaft and is fixedly connected to the shaft of a dynamometer via the drive shaft. One end of the dynamometer shaft facing away from the drive shaft is connected to the rotating shaft of a test device. The torsional vibration excitation device includes a magnetizing element, an excitation element, and a drive shaft. The magnetizing element includes a core and a coil. The coil is wound around the surface of the core and electrically connected to the control module in the torque control system. The magnetizing element and the excitation element are arranged opposite to each other and both are arranged around the circumference of the drive shaft. At most one of the magnetic components is fixedly connected to the drive shaft; the magnetic component, under the action of the magnetic field provided by the excitation component, is subjected to force and tends to rotate circumferentially around the drive shaft, while the excitation component itself is also subjected to a reaction force and also tends to rotate circumferentially around the drive shaft; when the magnetic component is fixedly connected to the drive shaft, the magnetic component applies a dynamic torque to the drive shaft; when the excitation component is fixedly connected to the drive shaft, the excitation component applies a dynamic torque to the drive shaft, thereby achieving the application of dynamic torque to the drive shaft; The torque control system includes: The control module, electrically connected to the torsional vibration excitation device, converts a reference signal into a control signal and outputs it to the torsional vibration excitation device; and A torque sensor, electrically connected to the control module, is used to be mounted on the shaft of the dynamometer and to acquire an actual torque signal. In the control module, the actual torque signal is compared with a target dynamic torque to obtain an error signal, the control signal is updated according to the error signal, and then output to the torsional vibration device. A speed sensor, electrically connected to the control module, is used to be mounted on the shaft of the dynamometer and to acquire the speed signal of the shaft of the dynamometer and the speed signal of the rotating shaft of the device under test; wherein, the reference signal includes the target dynamic torque and / or the speed signal measured by the speed sensor; the device under test includes one of an internal combustion engine, an electric motor, a pump, a gearbox, or a propeller; the reference signal is the target dynamic torque, or the speed signal measured by the speed sensor, or a combination of the target dynamic torque and the speed signal; The dynamometer provides the load torque, the torsional excitation device applies the target dynamic torque to the drive shaft, the target dynamic torque is transmitted to the device under test, and the torque sensor measures the load torque of the dynamometer combined with the dynamic torque provided by the torsional excitation device, so that the test personnel can examine the performance of the device under test when faced with dynamic torques of multiple frequencies.
2. The power control module according to claim 1, characterized in that, The torque control system further includes a weighting coefficient controller, which converts the reference signal into the control signal. The weighted coefficient controller has a weighted coefficient vector W(n), and W(n) = [w1(n), w2(n), ..., w m (n)] T ; The reference signal has a reference signal vector X(n), and X(n) = [x(n), x(n-1), ..., x(n-m+1)]. T ; n represents time, n+1 represents the next time step of n, n-1 represents the previous time step of n, and m is a positive integer; The value of the control signal at time n is y(n), and y(n) = W(n). T X(n).
3. The power control module according to claim 2, characterized in that, The weight coefficient controller updates the weight coefficient vector according to W(n+1)=W(n)+2μe(n)X'(n), where μ is the update step size of the weight coefficient vector W(n), X'(n) is obtained by transforming the reference signal through a transfer function, and e(n) is the error signal.
4. The power control module according to claim 1, characterized in that, The control module outputs an electrical signal to the magnetizing component, thereby generating a magnetic force between the magnetizing component and the excitation component, which in turn causes the magnetizing component or the excitation component to rotate relative to each other and output torque to the transmission shaft. The core is arranged circumferentially around the drive shaft.
5. The power control module according to claim 4, characterized in that, The excitation element includes multiple components, all of which are arranged around the circumference of the transmission shaft at intervals. The coils comprise multiple coils, all of which are arranged at intervals around the circumference of the drive shaft.
6. The power control module according to claim 5, characterized in that, The excitation element includes at least one first excitation element and / or at least one second excitation element; The first excitation element is located on the side of the excitation element that is away from the drive shaft; The second excitation element is located between the excitation element and the drive shaft.
7. The power control module according to claim 6, characterized in that, Each of the first excitation elements and each of the second excitation elements are arranged opposite to each other.
8. The power control module according to claim 6, characterized in that, The torsional vibration device also includes a first bearing, a first connector, a second connector, and a spring; The first bearing includes a fixed part and a movable part movably connected to the fixed part; The fixed part of the first bearing and the first connecting member are respectively fixedly connected to the transmission shaft, the movable part of the first bearing is fixedly connected to the second connecting member, the spring is connected between the first connecting member and the second connecting member, the second connecting member is fixedly connected to the excitation member, the first excitation member is fixedly connected to the first connecting member, and the second excitation member is fixedly connected to the fixed part of the first bearing. Alternatively, the fixed part of the first bearing and the second connecting member are respectively fixedly connected to the transmission shaft, the movable part of the first bearing is fixedly connected to the first connecting member and the second excitation member respectively, the spring is connected between the first connecting member and the second connecting member, the second connecting member is fixedly connected to the excitation member, and the first excitation member is fixedly connected to the first connecting member.
9. The power control module according to claim 8, characterized in that, The torsional vibration device also includes a support frame and a support bearing; The bracket bearings include two and are both connected to the bracket. The bracket is used to fix the torsional vibration device. The two ends of the transmission shaft away from the magnetizing element and the excitation element are respectively rotatably connected to one of the bracket bearings.