A multi-environment simulation variable pitch propeller power system test device and test method

Abstract

The present invention relates to a test device and a test method for a variable pitch propeller power system in multi-environment simulation. The test device includes an environment simulation chamber, a variable pitch propeller power system, a test platform, a lifting device, and a main control system; the variable pitch propeller power system includes a variable pitch propeller test piece and a motor for driving the rotation of the variable pitch propeller test piece; the environment simulation chamber is used to provide the air density, temperature and humidity environment required during the test, the lifting device is arranged in the environment simulation chamber, the test platform is arranged on the lifting device, and the lifting device is used to adjust the height of the test platform in the environment simulation chamber; the variable pitch propeller power system is installed on the test platform, and a sensor assembly for detecting the operating data of the variable pitch propeller power system is arranged on the test platform. The present invention can test the performance parameters of the variable pitch propeller under different test environments, and explore the matching of the blade angle and the rotational speed and the adaptability of the blade angle and the flight altitude.

Description

Technical Field

[0001] The present invention belongs to the technical field of performance monitoring of UAV propellers, and particularly relates to a multi-environment simulation variable pitch propeller power system test device and a test method. Background Art

[0002] The propeller is a key core component of a UAV. When the UAV is flying, it relies on the rotation of the propeller to push the air backward, thereby generating a forward thrust on the propeller blades. When the UAV is flying in a high-altitude, low-pressure environment, due to the decrease in air density and temperature, more energy needs to be consumed to ensure the safe flight of the UAV, which attenuates the endurance of the UAV. The variable pitch propeller can change the pitch according to the flight altitude and flight speed, thereby changing the output torque and thrust of the propeller and improving the energy utilization efficiency. At present, limited by the battery energy density, using a variable pitch propeller instead of a fixed pitch propeller is a simple and effective way to improve the endurance of the UAV. Therefore, it is necessary to measure the performance of the variable pitch propeller under different air densities, temperatures and humidities, and match the propeller speed and pitch to improve the energy utilization efficiency.

[0003] At present, there are few devices for testing the performance of variable pitch propellers. Most of them cannot conduct ground effect flight tests and cannot simulate different multi-factor environments. Therefore, the comprehensive performance of variable pitch propellers cannot be accurately and objectively tested. To sum up, it is necessary to develop a multi-environment simulation variable pitch propeller power system test device and a test method. Summary of the Invention

[0004] In order to solve the technical problems existing in the prior art, the present invention provides a multi-environment simulation variable pitch propeller power system test device and a test method, which can test the performance parameters of the variable pitch propeller under different test environments, and explore the matching of the blade angle and the rotation speed and the adaptability of the blade angle and the flight altitude.

[0005] The object of the present invention and the technical problems to be solved are achieved by the following technical solutions. A multi-environment simulation variable pitch propeller power system test device proposed according to the present invention includes an environment simulation chamber, a variable pitch propeller power system, a test platform, a lifting device, and a main control system; the variable pitch propeller power system includes a variable pitch propeller test piece and a motor for driving the rotation of the variable pitch propeller test piece; the environment simulation chamber is used to provide the air density and temperature and humidity environment required during the test, the lifting device is arranged inside the environment simulation chamber, the test platform is arranged on the lifting device, and the lifting device is used to adjust the height of the test platform in the environment simulation chamber, so as to control the height of the variable pitch propeller test piece; the variable pitch propeller power system is installed on the test platform, and a sensor assembly for detecting the operating data of the variable pitch propeller power system is arranged on the test platform; the main control system is electrically connected to the environment simulation chamber, the variable pitch propeller power system, the test platform, the lifting device, and the sensor assembly respectively. The main control system is used to set the air density and temperature and humidity inside the environment simulation chamber, the motor speed in the variable pitch propeller power system, the blade angle of the variable pitch propeller test piece, and the height of the test platform, and to monitor and collect the performance parameters of the variable pitch propeller power system in real time through the sensor assembly.

[0006] Further, the environment simulation chamber includes an environment adjustment device and an environment monitoring device; the environment adjustment device includes a box body, a PID controller, an electric heater, a humidifier, a cold air blower, and an electric air pump. The electric heater, the humidifier, the cold air blower, and the electric air pump are all connected to the PID controller; the environment monitoring device includes a gas density sensor, a temperature and humidity sensor, a gas pressure sensor, and a remote wireless data transmission module connected to the PID controller. The PID controller is wirelessly communicatively connected to the main control system through the remote wireless data transmission module. The electric heater, the humidifier, the cold air blower, the gas density sensor, the temperature and humidity sensor, and the gas pressure sensor are all arranged inside the box body. The box body is made of a transparent outer shell, and the inside of the box body is a sealed space. The electric air pump is arranged on one side of the box body and is used to extract the air inside the box body.

[0007] Further, the test platform includes a motor base, a motor bracket, a tension-compression-torque composite sensor, and a platform. The lower end of the tension-compression-torque composite sensor is fixed on the platform, and the working end of the tension-compression-torque composite sensor is connected to the motor bracket. The motor base and the motor bracket are connected by a plurality of double-headed internal thread cylindrical pins. The motor base and the motor bracket are arranged parallel to each other at intervals in the up and down directions. The motor in the variable pitch propeller power system is arranged on the motor bracket; a sensor assembly is installed on the test platform. The sensor assembly includes an optical fiber amplifier, a DC voltage and current monitoring device, and the tension-compression-torque composite sensor. The optical fiber amplifier is placed below the blade of the variable pitch propeller test piece, and the DC voltage and current monitoring device is used to detect the voltage and current data when the motor is working.

[0008] Further, a plurality of hollow portions are provided in the circumferential direction of the platform below the blades of the variable pitch propeller test piece.

[0009] Further, a plurality of long slot-shaped through holes are distributed in the circumferential direction of the motor base. Both the motor base and the motor bracket are in the shape of circular plates. The length direction of the long slot-shaped through hole extends along the radial direction of the motor base, and the long slot-shaped through hole is used for detachably fixing the connection with the motor.

[0010] Further, the lifting device includes a bottom plate, a guide shaft support, a flange, a servo motor, a lead screw lift, a cylindrical linear guide rail, and a flange linear bearing; the servo motor, the lead screw lift, and symmetrically distributed flange linear bearings are arranged on the bottom plate. The flange linear bearing and the cylindrical linear guide rail are in guiding sliding fit in the up and down direction. The upper end of the cylindrical linear guide rail is provided with a guide shaft support, and the guide shaft support is fixedly connected to the platform. The output shaft of the servo motor is connected to the worm of the lead screw lift through a coupling. The flange is installed at the top of the lead screw of the lead screw lift. The bottom end of the lead screw passes downward through the bottom plate, and the upper end surface of the flange is fixedly installed on the lower surface of the platform through bolts.

[0011] Further, a groove is built on a flat cement floor, and a bottom plate is horizontally laid above the groove. The upper plane of the bottom plate is kept level with the flat cement floor. The box body is fixedly arranged on the flat cement floor, and the cylindrical linear guide rail and the lead screw can move up and down inside the groove.

[0012] Further, the main control system includes an industrial control computer, a data acquisition card, an electronic speed controller, a servo driver, and a flight control system. The industrial control computer is wirelessly communicatively connected to the PID controller through a remote wireless data transmission module. The industrial control computer is connected to the flight control system. The flight control system is respectively connected to the electronic speed controller and the propeller pitch change device in the variable pitch propeller test piece. The electronic speed controller is used for electrically connecting to the motor of the variable pitch propeller power system. The industrial control computer is electrically connected to the servo motor through the servo driver. The industrial control computer is also electrically connected to the sensor assembly through the data acquisition card.

[0013] Further, a distribution box is also provided outside the environmental simulation chamber. The distribution box is used to provide the power required for the operation of the environmental simulation chamber, the variable pitch propeller power system, the test platform, the lifting device, and the main control system.

[0014] The test method of the above-mentioned multi-environment simulation variable pitch propeller power system test device includes the following steps:

[0015] According to the test requirements, set the test environment parameters on the industrial control computer of the main control system. The industrial control computer sends the required test environment parameter information to the PID controller through the remote wireless data transmission module. The PID controller controls the environmental simulation chamber to automatically adjust the environmental parameters inside the chamber according to the received instruction information of the main control system, and the environmental monitoring device transmits the environmental information back to the main control system in real time;

[0016] According to the size of the variable pitch propeller test piece, set the height of the test platform through the lifting device, and the servo motor rotates to drive the lead screw lift to complete the height adjustment;

[0017] Start the motor, and the variable pitch propeller test piece rotates. The sensor assembly monitors the lift, torque, voltage, current and speed data of the variable pitch propeller power system in real time. The main control system receives the test data through the data acquisition card and processes and analyzes it; when it is necessary to change the blade angle of the variable pitch propeller test piece, adjust it through the main control system controlling the propeller variable pitch device; test the matching of different blade angles at a certain speed.

[0018] By means of the above technical solutions, the beneficial effects of the present invention are: The multi-environment simulation variable pitch propeller power system test device designed by the present invention can simulate the flight test of the variable pitch propeller power system in multiple environments, and can also conduct ground effect flight tests to test the matching of the blade angle and speed of the variable pitch propeller. The whole set of test devices has a simple structure and simple and fast operation and test methods.

[0019] The above description is only an overview of the technical solution of the present invention. In order to understand the technical means of the present invention more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable, the following specifically gives preferred embodiments and, in conjunction with the drawings, details are described as follows. Brief Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the overall structure of a multi-environment simulation variable pitch propeller power system test device of the present invention.

[0021] Figure 2 It is a schematic diagram of the structure of the environmental simulation chamber in the present invention.

[0022] Figure 3 It is a schematic diagram of the environmental monitoring device in the present invention.

[0023] Figure 4 It is a front view structural schematic diagram of the lifting device and the test platform in the present invention.

[0024] Figure 5 It is a three-dimensional structural schematic diagram of the lifting device and the test platform in the present invention.

[0025] Figure 6 This is the connection principle block diagram of the main control system in the present invention.

[0026] Description of the reference numerals in the drawings: 1 - environmental simulation chamber, 2 - variable pitch propeller power system, 3 - test platform, 4 - lifting device, 5 - main control system, 6 - distribution box; 101 - box body, 102 - PID controller, 103 - electric heater, 104 - humidifier, 105 - air cooler, 106 - electric air pump, 107 - gas density sensor, 108 - temperature and humidity sensor, 109 - gas pressure sensor, 110 - remote wireless data transmission module; 201 - motor, 202 - variable pitch propeller test piece, 301 - motor base, 302 - double-headed internal thread cylindrical pin, 303 - motor bracket, 304 - tensile-compressive force - torque composite sensor, 305 - platform, 3011 - long slot-shaped through hole; 401 - bottom plate, 402 - guide shaft support, 403 - flange, 404 - servo motor, 405 - coupling, 406 - screw jack, 4061 - screw rod, 407 - cylindrical linear guide rail, 408 - flange linear bearing. Detailed implementation manners

[0027] The technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0028] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0029] Such as Figures 1 to 6, a multi-environment simulation variable pitch propeller power system test device, comprising an environmental simulation chamber 1, a variable pitch propeller power system 2, a test platform 3, a lifting device 4, a main control system 5 and a distribution box 6; the variable pitch propeller power system 2 includes a variable pitch propeller test piece 202 and a motor 201 that are connected in a supporting manner, and the motor 201 is used to provide power for the variable pitch propeller test piece 202. The environmental simulation chamber 1 is used to provide different air density and temperature and humidity environments required during the test; the distribution box 6 is used to provide power required for the environmental simulation chamber 1, the variable pitch propeller power system 2, the test platform 3, the lifting device 4 and the main control system 5; the lifting device 4 is mechanically connected to the test platform 3, and the lifting device 4 is used to adjust the height of the test platform 3, thereby changing the distance between the variable pitch propeller test piece 202 in the variable pitch propeller power system and the bottom plate 401, facilitating the ground effect flight test and the simulated flight test; the variable pitch propeller power system is installed on the test platform 3, and a sensor assembly is provided on the test platform 3. The sensor assembly includes a variety of sensors, which are used to monitor various operating data during the operation of the variable pitch propeller power system; the sensor assembly includes a tensile-compressive force-torque composite sensor 304, an optical fiber amplifier and a DC voltage and current monitoring device; the main control system is used to set the air density and temperature and humidity in the environmental simulation chamber 1, the motor speed in the variable pitch propeller power system, the blade angle of the variable pitch propeller test piece and the height of the test platform, and to monitor and collect the performance parameters of the variable pitch propeller power system in real time.

[0030] Specifically, the environmental simulation chamber 1 simulates different external environments and adjusts the density, temperature, and humidity of the air inside the chamber according to the set values. The environmental simulation chamber includes an environmental adjustment device and an environmental monitoring device; the environmental adjustment device includes a chamber body 101, a PID controller 102, an electric heater 103, a humidifier 104, a cooling fan 105, and an electric air pump 106; the environmental monitoring device includes a gas density sensor 107, a temperature and humidity sensor 108, a gas pressure sensor 109, and a remote wireless data transmission module 110. The chamber body 101 is a sealed space with a transparent outer shell, and the operation of the lifting device and the test platform can be observed from the outside. The electric heater 103 and the humidifier 104 are placed inside the chamber body. The electric heater 103, the humidifier 104, the cooling fan 105, the electric air pump 106, the gas density sensor 107, the temperature and humidity sensor 108, and the gas pressure sensor 109 are all electrically connected to the PID controller 102. The gas density sensor 107, the temperature and humidity sensor 108, and the gas pressure sensor 109 are all placed inside the chamber body 101. The PID controller 102 is also connected to the remote wireless data transmission module 110, and the remote wireless data transmission module 110 is responsible for transmitting the data collected by the PID controller 102 to the main control system 5 and receiving the information instructions sent by the main control system 5. The electric heater 103 is used to convert electrical energy into heat energy to quickly heat the air inside the chamber; the humidifier 104 is used to increase the moisture content in the air inside the chamber; the cooling fan 105 cools the air inside the chamber to adjust the temperature inside the chamber; the electric air pump 106 is used to pump out the air inside the chamber to change the air density. The gas density sensor 107, the temperature and humidity sensor 108, and the gas pressure sensor 109 are respectively used to monitor the air density, temperature and humidity, and pressure inside the chamber, and the remote wireless data transmission module 110 is responsible for transmitting the above-mentioned environmental monitoring data collected to the main control system 5. The main control system can control the operation of the environmental adjustment device through the PID controller according to various environmental data to maintain the required internal environment of the chamber.

[0031] The test platform 3 includes a motor base 301, a double-headed internal thread cylindrical pin 302, a motor bracket 303, a tensile-compressive force-torque composite sensor 304, and a platform 305. The platform 305 is designed with a hollow structure, having a plurality of hollow portions 3051 located below the blades of the variable pitch propeller test piece, that is, removing the redundant parts of the platform 305 on the premise of ensuring the strength and stiffness of the platform, so as not to affect the air flow during the rotation of the variable pitch propeller. In this embodiment, the platform 305 has a rectangular plate-like structure, and four hollow portions are evenly distributed in the circumferential direction of the rectangular plate-like structure, and a circular connection portion for connecting and matching with the tensile-compressive force-torque composite sensor and the flange 403 is left in the middle. The four top corners of the platform are respectively used to cooperate with the guide shaft supports 402. The lower plane of the platform 305 is mechanically connected to the guide shaft supports 402 and the flange 403 through bolts. The tensile-compressive force-torque composite sensor 304 is installed on the upper plane of the platform 305, and the lift and torque generated during the rotation of the variable pitch propeller are measured through the tensile-compressive force-torque composite sensor 304. The working end of the tensile-compressive force-torque composite sensor 304 is directly fixedly connected to the motor bracket 303 through bolts. The motor bracket 303 and the motor base 301 are mechanically connected through the double-headed internal thread cylindrical pin 302. The motor bracket 303 and the motor base 301 are arranged parallel to each other at intervals. Both the motor bracket 303 and the motor base 301 have a circular plate-like structure. The size of the circular connection portion at the center of the above platform is slightly smaller than that of the motor bracket and the motor base, so as to not affect the air flow during the rotation of the propeller as much as possible. The motor 201 is fixed on the motor base 301. The tensile and compressive forces measured by the tensile-compressive force-torque composite sensor 304 contain the gravity components of all the components connected thereto. Therefore, the test software in the main control system collects the gravity components of all relevant components and performs automatic compensation and real-time correction before starting the motor. To facilitate the disassembly and replacement of the motor, the motor bracket 303 and the motor base 301 are designed. The motor bracket 303 is evenly provided with four mounting holes, and the mounting holes are used to cooperate with the mounting bolts to connect to the lower end of the double-headed internal thread cylindrical pin 302. The upper end of the double-headed internal thread cylindrical pin 302 is fixedly connected to the motor base 301 through the mounting bolts. Since the double-headed internal thread cylindrical pin makes the motor bracket 303 and the motor base 301 arranged at intervals, sufficient space for motor loading and unloading is provided. Four long-slot-shaped through holes 3011 are distributed along the circumference of the motor base 301. The length direction of the long-slot-shaped through holes extends along the radial direction of the motor base. The long-slot-shaped through holes are used for centering and matching installation with the motor and are convenient for disassembly. The long-slot-shaped through holes can meet the installation requirements of motors of various model sizes. When installing the motor, the base of the motor 201 is fixedly matched with the long-slot-shaped through holes through fasteners.The fiber optic amplifier in the sensor assembly is used to measure the rotational speed of the propeller. The fiber optic amplifier is placed below the variable pitch propeller test piece. For example, it can be set on the upper surface of the motor base or the upper surface of the platform. The DC voltage and current monitoring device is used to collect the voltage and current data when the variable pitch propeller power system is working. The DC voltage and current monitoring device is connected to the power supply line of the motor to obtain the voltage and current data. It can be set on the lower surface of the motor base, the upper surface of the motor bracket or other suitable positions. The present invention does not limit this.

[0032] The lifting device 4 includes a bottom plate 401, a guide shaft support 402, a flange 403, a servo motor 404, a coupling 405, a screw jack 406, a cylindrical linear guide 407, and a flange linear bearing 408. In a feasible embodiment, a groove is built on a flat cement floor, and the bottom plate 401 is horizontally laid above the groove. The upper plane of the bottom plate 401 is level with the cement floor. An opening for installing the bottom plate and matching the size of the bottom plate is opened on the bottom shell of the box body. After the bottom plate is embedded in the opening, it is in sealed fit with the opening at the joint, so that the interior of the box body has better sealing performance. The groove has a certain depth to ensure that the screw 4061 of the screw jack 406 and the cylindrical linear guide 407 will not contact the bottom of the groove when moving downward. Or in another embodiment, the box body can be set on a bracket, and the bottom plate is set on the bottom shell of the box body. The height of the bottom shell of the box body from the ground should be greater than the limit stroke of the screw and the cylindrical linear guide moving downward. The bottom plate 401 is provided with a servo motor bracket, a screw jack 406, and four symmetrically distributed flange linear bearings 408. The flange linear bearings 408 are used in cooperation with the cylindrical linear guide 407 to maintain good directionality and stability. The upper end of the cylindrical linear guide 407 is installed with a guide shaft support 402, and the guide shaft support 402 is fixed to the cylindrical linear guide 407 by a setscrew. The servo motor 404 is installed on the servo motor bracket, and the servo motor 404 is mechanically connected to the worm of the screw jack 406 through the coupling 405. The screw jack 406 uses a ball screw pair to eliminate the axial clearance to ensure the smooth operation of the screw jack 406. Positive limit, negative limit, and origin travel switches are installed on the screw jack 406 to improve the safety of the test process. The flange 403 is installed at the top of the screw 4061 of the screw jack 406, and the upper end surface of the flange 403 is fixedly installed on the lower bottom surface of the test platform by bolts. When the servo motor 404 rotates, it drives the worm of the screw jack 406, and drives the ball screw pair of the screw jack 406 to move together after deceleration by the turbine. The flange 403 moves up and down linearly along with the screw 4061. The servo motor 404 is equipped with a brake to prevent axial rotation when the motor stops running. The screw jack 406 has a self-locking function to ensure the stability of the test platform.

[0033] When the lifting device operates, the rotation of the servo motor drives the worm of the screw jack to move together. After being decelerated by the deceleration mechanism, the screw 4061 rotates to make a reciprocating up and down motion, so that the flange on the top of the screw rises or falls; when the servo motor rotates forward, the screw rotates forward to drive the flange to rise together; when the servo motor rotates reversely, the screw rotates reversely to drive the flange to fall together, thereby realizing the lifting function of the test platform and the variable pitch propeller power system.

[0034] The main control system 5 is electrically connected to the environmental simulation chamber 1, the variable pitch propeller power system 2, the test platform 3 and the lifting device 4. Figure 6 , the main control system includes an industrial computer, a data acquisition card, an electronic speed controller, a servo driver and a flight control system. The industrial computer in the main control system 5 is communicatively connected to the environmental simulation chamber 1 through a remote wireless data transmission module 110, and is used to set the air temperature, humidity and density of the test environment and receive environmental information; the flight control system in the main control system 5 is respectively connected to the electronic speed controller and the propeller pitch changing device. The variable pitch propeller test piece includes the propeller pitch changing device, and the propeller pitch changing device is a prior art and is used to realize the adjustment of the propeller blade angle. The output end of the electronic speed controller is connected to the motor 201 in the variable pitch propeller power system 2, and the duty cycle of the PWM wave is adjusted by the flight control system, so as to control the rotation speed of the motor 201; the industrial computer in the main control system 5 controls the servo motor 404 through the servo driver, and precisely controls the rotation speed and rotation direction of the servo motor 404; the industrial computer in the main control system 5 is connected to the sensor assembly through the data acquisition card, and the lift, torque, voltage, current and rotation speed data of the variable pitch propeller power system are collected in real time; the industrial computer in the main control system 5 can also be responsible for the display of the human-machine interaction interface, the setting of test parameters and the analysis and processing of the collected data.

[0035] Based on the above-mentioned multi-environment simulation variable pitch propeller power system test device, the present invention proposes a multi-environment simulation variable pitch propeller power system test method, including the following steps:

[0036] The environmental simulation chamber adjusts the air density, temperature and humidity inside the box according to the setting of the main control system and keeps them relatively constant;

[0037] Set the height of the test platform, adjust the blade angle, start the motor, and measure the performance parameters of the variable pitch propeller power system respectively within and outside the ground effect influence range, and transmit them to the main control system;

[0038] Process and analyze the collected data on the industrial computer of the main control system, fit multiple power curves, and compare the matching of the rotation speed and blade angle of the variable pitch propeller under the set environment.

[0039] Further, for the above multi-environment simulation variable pitch propeller power system test method, specifically, the detailed test method during actual testing is as follows: First, turn on the test device. According to the test requirements, set the test environment parameters on the industrial control computer of the main control system. The test environment parameters mainly include air density and temperature and humidity. The main control system sends information to the PID controller through the remote wireless data transmission module. The PID controller automatically adjusts the environmental parameters inside the box of the environmental simulation chamber according to the received instruction information of the main control system. The environmental monitoring device transmits the environmental information back to the main control system in real time;

[0040] According to the size of the variable pitch propeller test piece, set the height of the test platform. The servo motor rotates to drive the lead screw lift to complete the height adjustment;

[0041] Start the motor, and the variable pitch propeller test piece rotates. The sensor assembly monitors the lift, torque, voltage, current, and rotational speed data of the variable pitch propeller power system in real time. The main control system receives the test data and processes and analyzes it, and can calculate the energy utilization efficiency; when it is necessary to change the blade angle of the variable pitch propeller test piece, it is adjusted through the main control system; finally, the matching of different blade angles can be tested at a certain rotational speed, the matching of rotational speed and blade angle can be explored, and the adaptability of blade angle and flight height can be explored.

[0042] Through the acquisition of the performance parameters of the power system by the main control system, changing the rotational speed and blade angle of the variable pitch propeller, at the low platform test height, the present invention can conduct ground effect flight tests on the propeller power system; at the high platform test height, the present invention can conduct simulated flight tests to observe the blade angle matching of the variable pitch propeller under different environments and different rotational speeds.

[0043] The above are only the preferred embodiments of the present invention, and the details not described are all prior arts; any person skilled in the art, without departing from the scope of the technical solution of the present invention, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A test device for a variable pitch propeller power system with multi - environment simulation, characterized in that: It includes an environmental simulation chamber, a variable pitch propeller power system, a test platform, a lifting device, and a main control system; the variable pitch propeller power system includes a variable pitch propeller test piece and a motor for driving the rotation of the variable pitch propeller test piece; the environmental simulation chamber is used to provide the air density, temperature, and humidity environment required during the test, the lifting device is arranged inside the environmental simulation chamber, the test platform is arranged on the lifting device, and the lifting device is used to adjust the height of the test platform in the environmental simulation chamber; the variable pitch propeller power system is installed on the test platform, and a sensor assembly for detecting the operating data of the variable pitch propeller power system is arranged on the test platform; the main control system is electrically connected to the environmental simulation chamber, the variable pitch propeller power system, the test platform, the lifting device, and the sensor assembly respectively; The environmental simulation chamber includes an environmental adjustment device and an environmental monitoring device; the environmental adjustment device includes a box body, a PID controller, an electric heater, a humidifier, a cooling fan, and an electric air pump, and the electric heater, the humidifier, the cooling fan, and the electric air pump are all connected to the PID controller; the environmental monitoring device includes a gas density sensor, a temperature and humidity sensor, a gas pressure sensor, and a remote wireless data transmission module connected to the PID controller, and the PID controller is wirelessly communicatively connected to the main control system through the remote wireless data transmission module. The electric heater, the humidifier, the cooling fan, the gas density sensor, the temperature and humidity sensor, and the gas pressure sensor are all arranged inside the box body. The box body is made of a transparent outer shell, and the inside of the box body is a sealed space. The electric air pump is arranged on one side of the box body and is used to extract the air inside the box body; The test platform includes a motor base, a motor bracket, a tension-compression-torque composite sensor, and a platform. The lower end of the tension-compression-torque composite sensor is fixed on the platform, and the working end of the tension-compression-torque composite sensor is connected to the motor bracket. The motor base and the motor bracket are connected by a plurality of double-headed internal thread cylindrical pins. The motor base and the motor bracket are arranged parallel and spaced apart in the up and down direction. The motor in the variable pitch propeller power system is arranged on the motor bracket; a sensor assembly is installed on the test platform. The sensor assembly includes an optical fiber amplifier, a DC voltage and current monitoring device, and the tension-compression-torque composite sensor. The optical fiber amplifier is placed below the blade of the variable pitch propeller test piece, and the DC voltage and current monitoring device is used to detect the voltage and current data when the motor is working; The test device further includes a distribution box arranged outside the environmental simulation chamber, and the distribution box is used to provide the power required for the operation of the environmental simulation chamber, the variable pitch propeller power system, the test platform, the lifting device, and the main control system.

2. The test device for a multi-environment simulation variable pitch propeller power system according to claim 1, characterized in that: The platform is provided with a plurality of hollow parts on its circumference below the blades of the variable pitch propeller test piece.

3. The test device for a multi-environment simulation variable pitch propeller power system according to claim 1, characterized in that: The motor base is provided with a plurality of long groove-shaped through holes distributed along the circumference. Both the motor base and the motor bracket are in a circular plate-like structure. The length direction of the long groove-shaped through hole extends along the radial direction of the motor base, and the long groove-shaped through hole is used for detachable fixed connection with the motor.

4. A test device for a multi-environment simulation variable pitch propeller power system according to claim 1, characterized in that: The lifting device includes a bottom plate, a guide shaft support, a flange, a servo motor, a screw jack, a cylindrical linear guide rail, and a flange linear bearing; the servo motor, the screw jack, and symmetrically distributed flange linear bearings are arranged on the bottom plate. The flange linear bearing and the cylindrical linear guide rail are in guiding sliding fit in the up and down directions. The upper end of the cylindrical linear guide rail is provided with a guide shaft support, which is fixedly connected to the platform. The output shaft of the servo motor is connected to the worm of the screw jack through a coupling. The flange is installed at the top of the screw of the screw jack, and the bottom end of the screw passes downward through the bottom plate. The upper surface of the flange is fixedly installed on the lower surface of the platform through bolts.

5. A test device for a multi-environment simulation variable pitch propeller power system according to claim 4, characterized in that: A groove is built on a flat cement ground, and the bottom plate is horizontally laid above the groove. The upper plane of the bottom plate is kept level with the flat cement ground. The box body is fixedly arranged on the flat cement ground, and the cylindrical linear guide rail and the screw can move up and down inside the groove.

6. The test device for a multi-environment simulation variable pitch propeller power system according to claim 4, characterized in that: The main control system includes an industrial control computer, a data acquisition card, an electronic speed controller, a servo driver, and a flight control system. The industrial control computer is wirelessly communicatively connected to the PID controller through a remote wireless data transmission module. The industrial control computer is connected to the flight control system, and the flight control system is respectively connected to the electronic speed controller and the propeller pitch-changing device in the variable-pitch propeller test piece. The electronic speed controller is used to be electrically connected to the motor of the variable-pitch propeller power system. The industrial control computer is electrically connected to the servo motor through the servo driver. The industrial control computer is also electrically connected to the sensor assembly through the data acquisition card.

7. A test method for a test device of a multi-environment simulation variable-pitch propeller power system, characterized in that, This test method is based on a multi-environment simulation variable-pitch propeller power system test device described in any one of claims 1-6, and includes the following steps: According to the test requirements, set the test environment parameters on the industrial control computer of the main control system. The industrial control computer sends the required test environment parameter information to the PID controller through the remote wireless data transmission module. The PID controller controls the environmental simulation chamber to automatically adjust the environmental parameters inside the box body according to the received main control system instruction information, and the environmental monitoring device transmits the environmental information back to the main control system in real time. According to the size of the variable-pitch propeller test piece, set the height of the test platform through the lifting device, and the servo motor rotates to drive the screw jack to act to complete the height adjustment. Start the motor, and the variable-pitch propeller test piece rotates. The sensor assembly monitors the lift, torque, voltage, current, and rotation speed data of the variable-pitch propeller power system in real time. The main control system receives the test data through the data acquisition card and processes and analyzes it; when it is necessary to change the blade angle of the variable-pitch propeller test piece, adjust it through the main control system controlling the propeller pitch-changing device; test the matching of different blade angles at a certain rotation speed.

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