An adjustable stator blade angle displacement measuring device
By synchronizing the SSI acquisition/decoding unit and LVDT acquisition module with a synchronous clock, the problem of independent angle and displacement acquisition in traditional equipment is solved, achieving high-precision angle and displacement measurement, reducing errors, and ensuring precise control of the adjustable stator blades.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI HANZHI ELECTRONIC TECH CO LTD
- Filing Date
- 2025-09-09
- Publication Date
- 2026-07-10
AI Technical Summary
Traditional angle sensor acquisition devices have low sampling rates, and the independent acquisition of blade angle and displacement results in a time difference of hundreds of milliseconds, leading to large errors in the relationship between angle and displacement, making it impossible to accurately control the angle of the adjustable stator blade.
The SSI acquisition/decoding unit and LVDT acquisition module are synchronized by a synchronous clock to achieve clock synchronization of the angle and displacement signals. The signal processing is performed through the SSI communication conditioning chassis and LVDT acquisition module to ensure synchronous acquisition of angle and displacement measurements and reduce time difference.
It achieves microsecond-level timing accuracy and tens of kHz sampling speed, obtaining accurate angle and displacement relationships and reducing quantitative analysis errors.
Smart Images
Figure CN224480125U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of adjustable stator blade angle measurement technology for aerospace engines, specifically an adjustable stator blade angle displacement measuring device. Background Technology
[0002] Adjustable stator vanes (VSVs) are present in both aero engines and gas turbines. These are adjustable stator vanes on the inlet guide vanes and the first few stator stages of the high-pressure compressor. Compressor control parameters include speed and temperature. As the compressor speed decreases from its design value, the stator vane angle gradually closes to ensure the airflow reaches the appropriate angle on the subsequent rotor blades. As the compressor speed increases, the stator vane angle gradually widens. The operation of the VSV is controlled by a FADEC or a hydraulic-mechanical fuel controller. The FADEC or hydraulic-mechanical fuel controller controls the movement of the servo-operated VSV actuator, which is then transmitted to the actuator ring via the rocker arm assembly, main rod, and connecting rod. The actuator ring causes all blades connected to it to rotate simultaneously. The blade angle is adjusted by the controller controlling the forward and backward movement of the actuator cylinder, and the actual position is compared with the required position. During engine development, it is necessary to measure the relationship between the forward and backward displacement of the actuator cylinder and the blade angle to accurately determine their quantitative relationship, ensuring the control system's ability to achieve precise angle control.
[0003] However, traditional angle sensor acquisition devices rely on software instructions to query and acquire sensor data, similar to the operation of a PLC. This results in a low sampling rate, and the acquisition of blade angle and displacement is independent, with a time difference of hundreds of milliseconds between the sampled data. This makes it difficult to obtain an accurate relationship between angle and displacement, leading to significant errors in quantitative analysis, meaning that the correspondence between angle and displacement has a large deviation. Utility Model Content
[0004] The purpose of this invention is to provide an adjustable stator blade angle displacement measuring device, which provides a synchronous acquisition mechanism that can achieve microsecond-level timing accuracy and tens of kHz sampling speed, obtain accurate angle and displacement relationships, and reduce quantitative analysis errors.
[0005] To achieve the above objectives, this utility model provides the following technical solution:
[0006] An adjustable stator blade angle displacement measuring device includes a main unit and a gas turbine. Adjustable stator blades are installed on the gas turbine. A first port of the main unit is electrically connected to a first port of an SSI acquisition / decoding unit. A third port of the SSI acquisition / decoding unit is electrically connected to a first port of an SSI communication conditioning chassis. A second port of the main unit is electrically connected to a first port of an LVDT acquisition module. A second port of the SSI acquisition / decoding unit is electrically connected to a second port of the LVDT acquisition module. The LVDT acquisition module is used to acquire the displacement of the adjustable stator blades to obtain displacement measurement signals. The signal output terminal of the gas turbine is electrically connected to the signal input terminal of an angle sensor. The signal output terminal of the angle sensor is electrically connected to the second port of the SSI communication conditioning chassis. Both the second port of the SSI acquisition / decoding unit and the second port of the LVDT acquisition module are connected to a synchronous clock for synchronously sending angle measurement signals and displacement measurement signals to the main unit. The third port of the LVDT acquisition module is electrically connected to the signal output terminal of the gas turbine.
[0007] As a further embodiment of this utility model: a plurality of peripheral slots are installed on one side of the SSI communication conditioning chassis. One end of the plurality of peripheral slots is electrically connected to an angle sensor, and the other end of the plurality of peripheral slots is electrically connected to one end of a TTL level module for transmitting and receiving 24V electrical signals. The other end of the TTL level module is connected to a first parallel port, which is used to send an angle measurement signal to the SSI acquisition / decoding unit.
[0008] As a further embodiment of this utility model: the SSI communication conditioning chassis integrates a cPCIe data acquisition module and a PCIe data acquisition module, which are connected in parallel.
[0009] As a further embodiment of this invention: the SSI communication conditioning chassis is provided with at least twenty angle measurement signal channels and at least two LVDT signal channels. The SSI communication conditioning chassis is used to connect the signal wiring of the angle sensor to the SSI acquisition / decoding unit.
[0010] As a further aspect of this invention: the angle sensor 5 is connected to at least 20 channels that support SSI protocol communication, and the channels ensure anti-interference and data accuracy during the acquisition of angle measurement signals by providing differential input.
[0011] As a further embodiment of this invention: the SSI acquisition / decoding unit is connected to the adapter module and multiple single-ended I / O lines, and the SSI acquisition / decoding unit is used to acquire and demodulate the angle measurement signal.
[0012] As a further embodiment of this utility model: the LVDT acquisition module is a filtered analog input module, which has at least four analog input channels and is used for self-calibration, overcurrent detection and coil open circuit detection.
[0013] Compared with the prior art, the beneficial effects of this utility model are:
[0014] In this invention, by using a synchronous clock to synchronize the SSI acquisition / decoding unit and the LVDT acquisition module, the angle measurement signal obtained by the SSI acquisition / decoding unit and the displacement measurement signal obtained by the LVDT acquisition module can be clock-synchronized, and the synchronized angle measurement signal and displacement measurement signal can be sent to the host. This eliminates the time difference of hundreds of milliseconds between the sampled data, obtains accurate angle and displacement relationships, and reduces quantitative analysis errors. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the device module of this utility model;
[0016] Figure 2 This is a schematic diagram of the signal acquisition of the SSI communication conditioning chassis of this utility model.
[0017] In the diagram: 1. Main unit; 2. SSI acquisition / decoding unit; 3. LVDT acquisition module; 4. SSI communication conditioning chassis; 5. Angle sensor. Detailed Implementation
[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0019] It should be noted that SSI is a synchronous serial interface technology, and SSI acquisition / decoding unit 2 is a serial data acquisition / decoding unit under the synchronous serial interface technology.
[0020] Example:
[0021] Please see Figures 1-2In this embodiment of the present invention, an adjustable stator blade angle displacement measuring device includes a main unit 1 and a gas turbine. Adjustable stator blades are installed on the gas turbine. The first port of the main unit 1 is electrically connected to the first port of an SSI acquisition / decoding unit 2. The third port of the SSI acquisition / decoding unit 2 is electrically connected to the first port of an SSI communication conditioning chassis 4. The second port of the main unit 1 is electrically connected to the first port of an LVDT acquisition module 3. The second port of the SSI acquisition / decoding unit 2 is electrically connected to the second port of the LVDT acquisition module 3. The LVDT acquisition module 3 is used to acquire the displacement of the adjustable stator blades to obtain displacement measurement signals. The signal output terminal of the gas turbine is electrically connected to the signal input terminal of an angle sensor 5. The signal output terminal of the angle sensor 5 is electrically connected to the second port of the SSI communication conditioning chassis 4. The second ports of both the SSI acquisition / decoding unit 2 and the LVDT acquisition module 3 are connected to a synchronous clock for synchronously sending angle measurement signals and displacement measurement signals to the main unit. The third port of the LVDT acquisition module 3 is electrically connected to the signal output terminal of the gas turbine.
[0022] In this embodiment, the host is a PXI controller, model HZ-8881, and the SSI communication conditioning chassis is a PXIe chassis, model HZ-1071.
[0023] Preferably, the SSI communication conditioning chassis 4 has multiple peripheral slots installed on one side. One end of each peripheral slot is electrically connected to the angle sensor, and the other end is electrically connected to one end of a TTL level module for transmitting and receiving 24V electrical signals. The other end of the TTL level module is connected to a first parallel port, which is used to send angle measurement signals to the SSI acquisition / decoding unit 2. The multiple peripheral slots include at least twenty aviation connectors. Since the SSI acquisition module is developed based on an FPGA board, the voltage level on the angle sensor side is 24V. Therefore, it is necessary not only to provide digital signal level conversion inside the SSI communication conditioning chassis 4, but also to provide power to the angle sensor.
[0024] Preferably, the SSI communication conditioning chassis 4 integrates a cPCIe data acquisition module and a PCIe data acquisition module, which are connected in parallel. A backplane is mounted on one side of the SSI communication conditioning chassis. The surface of the backplane integrates a PCI bus, a timing bus, and a trigger bus. The trigger bus includes a PXI trigger bus, a star trigger bus, and a local bus. Peripheral devices are connected to the trigger bus. These peripheral devices are connected to a 10MHz system reference clock and a signal synchronization module via the timing bus. Peripheral devices are connected to each other via a star trigger bus. The SSI communication conditioning chassis 4 is equipped with a built-in 10 MHz reference clock, a PXI trigger bus, and a PXI star trigger for the PXI module, and a built-in 100 MHz reference clock, SYNC 100, and a PXI star differential trigger for the PXI Express module.
[0025] Preferably, the SSI communication conditioning chassis 4 is provided with at least twenty angle measurement signal channels and at least two LVDT signal channels. The SSI communication conditioning chassis 4 is used to connect the signal wiring of the angle sensor 5 to the SSI acquisition / decoding unit, thereby ensuring the interface type and matching requirements of different types of signals. Preferably, the matching requirements include the channel matching requirements of the angle measurement signal and the LVDT signal.
[0026] Preferably, the angle sensor 5 is connected to at least 20 channels that support SSI protocol communication. The channels provide differential input to ensure anti-interference and data accuracy during the acquisition of angle measurement signals.
[0027] Preferably, the SSI acquisition / decoding unit 2 is connected to the adapter module and multiple single-ended I / O lines. The SSI acquisition / decoding unit 2 is used to acquire and demodulate the angle measurement signal.
[0028] In this embodiment, the SSI acquisition / decoding unit 2 is model HZ-7853.
[0029] Preferably, the LVDT acquisition module 3 is a filtered analog input module, which has at least four analog input channels and is used for self-calibration, overcurrent detection and coil open circuit detection.
[0030] In this embodiment, the LVDT acquisition module 3 is model HZ-4340.
[0031] The LVDT acquisition module 3 requires at least two channels for displacement or vibration measurement. The signal output by the LVDT acquisition module 3 is an analog quantity of the displacement measurement signal, which needs to be demodulated by the host 1 to obtain accurate displacement data. In order to ensure accurate acquisition of the displacement measurement signal, the LVDT acquisition module 3 is equipped with a matching analog input channel, which has a dedicated LVDT demodulation module or an external demodulator.
[0032] Preferably, the angle sensor 5 includes an angle acquisition unit and an incremental encoder. The output of the angle acquisition unit is connected to the input of the incremental encoder, and the output of the input of the incremental encoder is connected to the SSI communication conditioning chassis.
[0033] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.
Claims
1. An adjustable stator blade angle displacement measuring device, comprising a main unit (1) and a gas turbine, wherein adjustable stator blades are mounted on the gas turbine, characterized in that: The first port of the host (1) is electrically connected to the first port of the SSI acquisition / decoding unit (2), the third port of the SSI acquisition / decoding unit (2) is electrically connected to the first port of the SSI communication conditioning chassis (4), the second port of the host (1) is electrically connected to the first port of the LVDT acquisition module (3), the second port of the SSI acquisition / decoding unit (2) is electrically connected to the second port of the LVDT acquisition module (3), the LVDT acquisition module (3) is used to acquire the displacement of the adjustable stator blade to obtain the displacement measurement signal, the signal output terminal of the gas turbine is electrically connected to the signal input terminal of the angle sensor (5), the signal output terminal of the angle sensor (5) is electrically connected to the second port of the SSI communication conditioning chassis (4), the second port of the SSI acquisition / decoding unit (2) and the second port of the LVDT acquisition module (3) are both connected to a synchronous clock to synchronously send the angle measurement signal and the displacement measurement signal to the host, and the third port of the LVDT acquisition module (3) is electrically connected to the signal output terminal of the gas turbine.
2. The adjustable stator blade angle displacement measuring device according to claim 1, characterized in that: The SSI communication conditioning chassis (4) has multiple peripheral slots installed on one side. One end of each peripheral slot is electrically connected to an angle sensor, and the other end of each peripheral slot is electrically connected to one end of a TTL level module for transmitting and receiving 24V electrical signals. The other end of the TTL level module is connected to a first parallel port, which is used to send angle measurement signals to the SSI acquisition / decoding unit (2).
3. The adjustable stator blade angle displacement measuring device according to claim 1, characterized in that: The SSI communication conditioning chassis (4) integrates a cPCIe data acquisition module and a PCIe data acquisition module, which are connected in parallel.
4. The adjustable stator blade angle displacement measuring device according to claim 3, characterized in that: The SSI communication conditioning chassis (4) is equipped with at least 20 angle measurement signal channels and at least two LVDT signal channels. The SSI communication conditioning chassis (4) is used to connect the signal wiring of the angle sensor (5) to the SSI acquisition / decoding unit.
5. The adjustable stator blade angle displacement measuring device according to claim 1, characterized in that: The SSI acquisition / decoding unit (2) is connected to the adapter module and multiple single-ended I / O lines. The SSI acquisition / decoding unit (2) is used to acquire and demodulate the angle measurement signal.
6. The adjustable stator blade angle displacement measuring device according to claim 1, characterized in that: The LVDT acquisition module (3) is a filtered analog input module. The filtered analog input module is equipped with at least four analog input channels. The filtered analog input module is used for self-calibration, overcurrent detection and coil open circuit detection.