Propeller dynamic balance testboard system

Abstract

The utility model discloses a propeller dynamic balance testboard system, which comprises a power system, a sensor module, an RS-485 serial port and a PC (Personal Computer) end, the sensor module is connected with the power system and transmits data of the power system to the PC terminal through an RS-485 serial port; the power system comprises a brushless motor, an electronic speed regulator, a PWM (Pulse Width Modulation) signal generator and a battery; the sensor module comprises a signal acquisition module, a voltage and current sensor, a vibration sensor, a photoelectric sensor and an Lm393 voltage comparison module; the system provided by the utility model is high in test precision, simple in structure, simple to operate, good in safety and low in experiment cost.

Description

Technical Field

[0001] The utility model discloses and relates to the technical field of on-site dynamic balancing test, in particular to a propeller dynamic balancing test bench system. Background Art

[0002] General aircraft have the advantages of low noise, easy use and maintenance, and low operating costs, and have become the focus of the world's aviation industry. General aircraft generally use propellers to generate thrust. The causes of propeller vibration include mass imbalance. Mass imbalance is due to the fact that the masses of the propeller-propeller cover cannot be balanced with each other, and the center of gravity of the entire propeller propeller cover is not on the propeller shaft axis. When the propeller cover with unbalanced mass rotates, the magnitude of the inertial centrifugal force it generates has nothing to do with the blade angle, but only changes with the change of the rotation speed.

[0003] On-site dynamic balancing detection technology is a comprehensive subject technology, involving a lot of theoretical knowledge. Compared with other dynamic balancing technologies, on-site dynamic balancing does not require disassembly and assembly, and the hardware equipment requirements are not high, thus avoiding errors caused by disassembly and assembly, and has the characteristics of low economic cost.

[0004] Designing an efficient propeller dynamic balancing measurement system is of great significance to improving the measurement accuracy of dynamic balancing experiments, improving measurement efficiency and simplifying usage steps. Utility Model Content

[0005] In view of this, the utility model discloses a propeller dynamic balancing test bench system.

[0006] The technical solution provided by the utility model is specifically, a propeller dynamic balance test bench system, including a power system, a sensor module, an RS-485 serial port and a PC terminal;

[0007] The sensor module is connected to the power system, and the sensor module transmits the data of the power system to the PC via the RS-485 serial port;

[0008] The power system includes a brushless motor, an electronic speed regulator, a PWM signal generator, and a battery;

[0009] The sensor module comprises a signal acquisition module, a voltage and current sensor, a vibration sensor, a photoelectric sensor (9), and an Lm393 voltage comparison module;

[0010] The PWM signal generator is connected to the electronic speed regulator signal, the electronic speed regulator is connected to the brushless motor, and the brushless motor drives the propeller to rotate; the PWM signal generator communicates with the RS-485 serial port in a two-way manner, and the PC sends instructions to control the signal generated by the PWM signal generator to control the speed of the brushless motor;

[0011] The brushless motor is also connected to a vibration sensor, a photoelectric sensor, and an Lm393 voltage comparison module respectively;

[0012] The voltage and current sensor and the vibration sensor are connected to the RS-485 serial port, and the voltage and current data of the power system are transmitted to the PC end through the RS-485 serial port;

[0013] The photoelectric sensor and the Lm393 voltage comparison module are connected to a signal acquisition module, and the signal acquisition module is used to collect and count the signals of the photoelectric sensor and the Lm393 voltage comparison module; the signal acquisition module is connected to the RS-485 serial port, and the collected signals and counting results are sent to the PC end through the RS-485 serial port;

[0014] The battery module is connected with the voltage and current sensor, the vibration sensor, the photoelectric sensor, the Lm393 voltage comparison module, and the PWM signal generator to supply power to the above devices.

[0015] The model of the signal acquisition module is STM32F103ZET6, the main battery in the battery is a 48V flight power battery, the model of the brushless motor is U11; the model of the electronic speed regulator is FLAME 80A HV v2.

[0016] Specifically, the signal acquisition module also includes a power conversion buck-stabilizing circuit, wherein the power conversion buck-stabilizing circuit includes a buck-stabilizing chip and a 5V conversion chip, wherein the input end of the buck-stabilizing chip is connected to the battery module, and the input end of the 5V conversion chip is connected to the output end of the buck-stabilizing chip.

[0017] The utility model provides a propeller dynamic balancing test bench system, which has high test accuracy by selecting reasonable module composition and connection, and also has the advantages of simple structure, simple operation, good safety, low experimental cost, etc.

[0018] It should be understood that the above general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings herein are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present utility model, and together with the description, are used to explain the principles of the present utility model.

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A system diagram of a propeller dynamic balancing test bench system provided in the disclosed embodiment of the utility model;

[0022] Figure 2 A CPU pin diagram of the signal acquisition module in a propeller dynamic balancing test bench system provided in an embodiment of the utility model;

[0023] Figure 3 A communication network structure diagram of an information acquisition module provided in the disclosed embodiment of the utility model;

[0024] Figure 4 This is a circuit diagram of the Lm393 voltage comparison module provided in the disclosed embodiment of the utility model. DETAILED DESCRIPTION

[0025] Here, exemplary embodiments will be described in detail, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the utility model. Instead, they are only examples of systems consistent with some aspects of the utility model as detailed in the attached claims.

[0026] In order to solve the problem of lack of a test bench for dynamic balancing of propellers in the prior art, this embodiment provides a propeller dynamic balancing test bench system, which calculates the signals of various sensors and finally realizes the dynamic balancing test of the propeller.

[0027] Specifically, Figure 1 As shown, this embodiment provides a propeller dynamic balancing test bench system, including a power system, a sensor module, an RS-485 serial port 6 and a PC terminal;

[0028] The sensor module is connected to the power system, and the sensor module transmits the data of the power system to the PC via RS-485 serial port 6;

[0029] The power system includes a brushless motor 2, an electronic speed regulator 3, a PWM signal generator 4, and a battery 5;

[0030] The sensor module includes a signal acquisition module 1, a voltage and current sensor 7, a vibration sensor 8, a photoelectric sensor 9, and an Lm393 voltage comparison module 10;

[0031] The PWM signal generator 4 is connected to the electronic speed regulator signal 3, the electronic speed regulator 3 is connected to the brushless motor 2, and the brushless motor 2 drives the propeller to rotate; the PWM signal generator 4 communicates with the RS-485 serial port 6 in a two-way manner, and the PC sends instructions to control the signal generated by the PWM signal generator to control the speed of the brushless motor 2;

[0032] The brushless motor 2 is also connected to a vibration sensor 8, a photoelectric sensor 9, and an Lm393 voltage comparison module 10 respectively;

[0033] The voltage and current sensor 7 and the vibration sensor 8 are connected to the RS-485 serial port 6, and the voltage and current data of the power system are transmitted to the PC end through the RS-485 serial port 6;

[0034] The photoelectric sensor 9 and the Lm393 voltage comparison module 10 are connected to the signal acquisition module 1, and the signal acquisition module 1 is used to collect and count the signals of the photoelectric sensor 9 and the Lm393 voltage comparison module 10; the signal acquisition module 1 is connected to the RS-485 serial port 6, and the collected signals and counting results are sent to the PC end through the RS-485 serial port 6;

[0035] The battery module 5 is connected to the voltage and current sensor 7, the vibration sensor 8, the photoelectric sensor 9, the Lm393 voltage comparison module 10, and the PWM signal generator 4 to supply power to the above devices.

[0036] The model of the signal acquisition module 1 is STM32F103ZET6, the main battery in the battery 5 is a 48V flight power battery, the model of the brushless motor 2 is U11; the model of the electronic speed regulator 3 is FLAME 80A HV v2.

[0037] The signal acquisition module 1 also includes a power conversion buck-stabilizing circuit, wherein the power conversion buck-stabilizing circuit includes a buck-stabilizing chip and a 5V conversion chip, wherein the input end of the buck-stabilizing chip is connected to the battery module 5, and the input end of the 5V conversion chip is connected to the output end of the buck-stabilizing chip.

[0038] The signal acquisition module is connected to a 5V power supply, and the electronic speed regulator input voltage is 18-48V.

[0039] The propeller dynamic balancing test bench system also includes a power conversion buck-stabilizing circuit, wherein the power conversion buck-stabilizing circuit includes a buck-stabilizing chip and a 5V conversion chip, wherein the input end of the buck-stabilizing chip is connected to the battery, and the input end of the 5V conversion chip is connected to the output end of the buck-stabilizing chip, so that all modules are connected to the corresponding working voltage.

[0040] As an improvement of the technical solution, the Lm393 voltage comparison circuit designed in this propeller dynamic balancing test bench system can compare the voltage of the three-phase power of the motor, and then accurately calculate the speed of the motor. Figure 4 .

[0041] The signal acquisition module 1, PWM signal generator 4, voltage and current sensor 7, vibration sensor 8 and PC terminal all use RS485 communication. Figure 3 In the RS485 communication network, a 485 transceiver is usually used to convert the TTL level into the differential signal of RS485. The serial port controller TxD of the MCU sends data, which is converted into a differential signal by the 485 transceiver and transmitted to the bus. When receiving data, the 485 transceiver converts the differential signal on the bus into a TTL signal from RxD to the serial port controller. In the entire communication network, there is usually only one host, and the rest are all slaves. In the RS485 bus, it is usually necessary to add terminal matching resistors of about 120Ω at the start and end ends of the bus to ensure the stability of the RS485 bus. The USART2_RX and USART2_RX pins of the controller pins are connected to the RO and DI of the 485 chip, such as Figure 3 This is the schematic diagram of the RS485 part of the development board. U16 is a 3.3V low-power half-duplex transceiver that meets the RS-485 standard. The RX and TX of USART are converted by U16 to RS485 A and B. The RE of U16's 2nd pin is receive enable, and the overline indicates that the low level is valid, that is, when the 2nd pin of U16 is low, U16 receives data. The DE of U16's 3rd pin is output enable, and the high level is valid, that is, when the 3rd pin of U16 is high, U16 sends data.

[0042] Applying the above system, the following control process is adopted:

[0043] S1: Check the circuit and connect the battery if it is correct. The PC controls the motor to start rotating at a fixed speed through PWM signal generator 4.

[0044] S2: The PC sends a command through the RS-485 serial port to control each sensor to start feeding back data.

[0045] S3: The voltage and current sensor 7 and the vibration sensor 8 transmit the data to the PC via the RS-485 serial port. The Lm393 voltage comparison circuit 10 and the photoelectric sensor 9 transmit the collected corresponding data to the PC via the signal acquisition module 1.

[0046] S4: The Lm393 voltage comparison circuit 10 and the photoelectric sensor 9 transmit the corresponding collected data to the PC via the signal acquisition module 1.

[0047] S5: The PC side calculates and processes the transmitted data using the existing influence coefficient method technology to obtain the dynamic balancing result.

[0048] The influence coefficient method described in S5 is the existing single-sided influence coefficient method, and the specific steps are as follows:

[0049] 1) Without adding test weight to the rotor, make the propeller run at the required speed, measure the original vibration amplitude and phase at the measuring point, and express it with vector A0; the phase is measured using the pulse method commonly used in industry.

[0050] Select the reference point of the vibration signal and the pulse signal (the data obtained from the above modules), and then subtract the two signals according to the reference point to obtain the time difference t. Assuming that the period of the two same-frequency signals is T, the phase of the unbalanced vibration is φ = (t / T) * 360°.

[0051] 2) Obtain the trial weight Added to the propeller; (where K represents the balance support sensitivity)

[0052] 3) Start the propeller again, keep the propeller speed the same as the first start, measure the amplitude and phase of the propeller vibration again, and use vector A 01 express.

[0053] Solve for the influence coefficient:

[0054] 4) Establish dynamic balance vector equation:

[0055] αQ+A0=0;

[0056] Calculate the balancing mass that should be added to the balancing surface:

[0057]

[0058] The required balancing mass is a vector, including the magnitude and phase of the mass. Dynamic balancing is completed by adding the required balancing mass to the central axis of the propeller.

[0059] Through the propeller dynamic balancing test bench system provided by the present embodiment, reasonable modules are selected, combined and used in the system, and the dynamic balancing experiment of the propeller is realized by collecting various sensor signal data, thereby solving the problem that there are almost no test benches for dynamic balancing of propellers in the prior art.

[0060] Those skilled in the art will readily come up with other embodiments of the present invention after considering the specification and practicing the utility model disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary technical means in the art that are not disclosed in the present invention. The specification and examples are to be considered as exemplary only, and the true scope and spirit of the present invention are indicated by the claims.

[0061] It should be understood that the present invention is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A propeller dynamic balancing test bench system, characterized in that: It includes a power system, a sensor module, an RS-485 serial port (6) and a PC terminal; The sensor module is connected to the power system, and the sensor module transmits the data of the power system to the PC via the RS-485 serial port (6); The power system comprises a brushless motor (2), an electronic speed regulator (3), a PWM signal generator (4), and a battery (5); The sensor module comprises a signal acquisition module (1), a voltage and current sensor (7), a vibration sensor (8), a photoelectric sensor (9), and an Lm393 voltage comparison module (10); The PWM signal generator (4) is connected to the electronic speed regulator (3) by signal, the electronic speed regulator (3) is connected to the brushless motor (2), and the brushless motor (2) drives the propeller to rotate; the PWM signal generator (4) communicates with the RS-485 serial port (6) in a two-way manner, and the PC sends a command to control the signal generated by the PWM signal generator to control the speed of the brushless motor (2); The brushless motor (2) is also connected to a vibration sensor (8), a photoelectric sensor (9), and an Lm393 voltage comparison module (10) respectively; The voltage and current sensor (7) and the vibration sensor (8) are connected to the RS-485 serial port (6), and the voltage and current data of the power system are transmitted to the PC terminal through the RS-485 serial port (6); The photoelectric sensor (9) and the Lm393 voltage comparison module (10) are connected to a signal acquisition module (1), and the signal acquisition module (1) is used to collect and count signals from the photoelectric sensor (9) and the Lm393 voltage comparison module (10); the signal acquisition module (1) is connected to an RS-485 serial port (6), and sends the collected signals and counting results to a PC via the RS-485 serial port (6); The battery (5) is connected to a voltage and current sensor (7), a vibration sensor (8), a photoelectric sensor (9), an Lm393 voltage comparison module (10), and a PWM signal generator (4) to supply power to the above-mentioned various devices.

2. A propeller dynamic balancing test bench system according to claim 1, characterized in that: The model of the signal acquisition module (1) is STM32F103ZET6, the main battery in the battery (5) is a 48V flight power battery, the model of the brushless motor (2) is U11; and the model of the electronic speed regulator (3) is FLAME 80A HV v2.

3. A propeller dynamic balancing test bench system according to claim 1, characterized in that: The signal acquisition module (1) also includes a power conversion buck voltage stabilization circuit, wherein the power conversion buck voltage stabilization circuit includes a buck voltage stabilization chip and a 5V conversion chip, wherein the input end of the buck voltage stabilization chip is connected to the battery (5), and the input end of the 5V conversion chip is connected to the output end of the buck voltage stabilization chip.

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