RU2688629C1 - Digital non-contact multichannel telemetric system - Google Patents

Abstract

FIELD: engines and pumps.SUBSTANCE: invention relates to providing testing of gas turbine engines, in particular, debugging of blades unit of compressors and turbines, and also can be used in practice of measurements of deformations, temperatures, vibrations on any rotating and movable parts of units. Digital non-contact multichannel telemetric system consists of a measuring unit, a stator unit, a receiving and recording unit, power supply and visualization means. Measuring unit is made in the form of compact modules based on 8-layer flexible boards filled with high-strength compounds operating in the temperature range from minus 50 to +125 degrees and withstanding centripetal acceleration to 40,000 g and vibration to 150 g, each measuring module has duplicated high-frequency data transmission channels, antenna system allows simultaneous connection of 16 transmitting devices with total throughput capacity per complex of not less than 200 Mbit/s, with dynamic range of strain measurement channels up to 60 kHz and with non-uniformity of amplitude-frequency characteristic of not more than 0.5 dB, each measuring module is additionally equipped with built-in self-diagnostics system of condition of sensors and cable lines, and possibility of switching to reserve groups of sensors, wherein rotor and stator units are equipped with special screened antenna systems for use of low-power high-frequency transmitters and induction power supply systems with provision of electromagnetic compatibility of the system. Device considerably enlarges the possibility of detecting parameters on hard-to-reach rotating and moving assemblies under difficult operating conditions.EFFECT: proposed device can be basic when equipped with test benches of gas turbine engines, gas turbine units and onboard measurement systems.1 cl, 1 dwg

Description

The invention relates to the provision of tests of gas turbine engines, in particular, the debugging of the blade apparatus of compressors and turbines, and can also be used in the practice of measuring deformations, temperatures, vibrations on any rotating and moving parts of units.

Known telemetry transmitter for test technology on rotating parts of products, providing contactless data transmission and inductive power supply with built-in diagnostics of the rotor (Al-Scud telemetry system).

Also known is the measuring and measuring system KIS 1.1, designed to measure signals from strain gauges installed on rotating blades in the rotor part of an aircraft turbojet engine, converting and transmitting them to the automated position of the operator (State Register of Measuring Instruments No. 32248-06) and including:

- The rotor part: strain gauges, USP 1.1 unit (instrumentation amplifier, low-frequency filter, multichannel analog-digital converters, control devices), infrared transmitter;

- Stator part: PU 1.1 block (data reception, framing, RS-485 interface, induction pumping of power), measurement modules;

- Automated workplace.

This solution is the closest to the technical essence and the achieved result of the present invention (prototype). However, this system has a limited number of registration channels, an insufficient set of connected sensors, a narrow band of measured signals and cannot provide the entire set of measurements during the tests.

The technical result of the invention is aimed at improving the accuracy of measuring the parameters of rotating parts of products, increasing the information content of the test, reducing the effect of interference and reducing costs by reducing the number of tests performed.

Digital non-contact multichannel telemetry complex consists of a measuring unit, a stator unit, a receiving and recording unit, power supply and visualization tools. Moreover, the measuring unit is made in the form of compact modules, based on 8-layer flexible boards, filled with high-strength compounds, operating in the temperature range from minus 50 to +125 degrees and withstanding centripetal acceleration up to 40000 g and vibration up to 150 g. In turn, each measuring module has duplicated high-frequency data transmission channels, and the antenna system allows simultaneous connection of 16 transmitters with a total bandwidth of at least 200 Mbit / s complex, a dynamic range of strain gauge channels up to 60 kHz and uneven amplitude frequency response not more than 0.5 dB. Additionally, the measuring unit is equipped with built-in self-diagnostics of the state of sensors and cable lines, as well as the ability to switch to redundant sensor groups, while the measuring and stator units are equipped with special shielded antenna systems for using low-power high-frequency transmitters and inductive power supply systems while ensuring electromagnetic compatibility of the complex.

The technical result is achieved by using compact (small-sized) measuring modules for operation in the confined space of the test product, which simplifies their placement within the volume of the operating engine, eliminates the imbalance at high speeds and allows the use of a larger number of measuring transducers, as well as using additional measuring paths that allow other types of sensors (temperature, pressure), which significantly expands the functional and diagnostic complex features The design of the telemetry complex has a modular structure that allows you to combine the number and types of connected transducers. Measuring strain-gauge paths are equipped with 24-bit analog-digital converters, the ability to switch measurement ranges and high bandwidth (up to 60 kHz with uneven amplitude-frequency characteristics of not more than 0.5 dB), which allows to increase the accuracy of the data and register much faster processes . High-speed data transmission channels (at least 200 Mbit / s) allow you to transfer the full amount of information obtained during the test.

The novelty of the invention lies in expanding the functionality of the complex by: increasing the number of measuring channels without increasing the occupied volume, higher channel bandwidth, connecting additional types of sensors and redundant sensor groups, changing the operating modes of the measuring modules during testing, duplicating communication channels. For the first time, the use of compact full-featured measuring modules with built-in diagnostics and high-speed redundant data transmission channel and power stabilizers, located directly on rotating nodes and designed to work in extreme conditions of operation (inside the aircraft engine in flight mode, the rotor part rotates at high speed, at which The centripetal acceleration acting on devices can reach 40,000g, vibrations 150g, and temperatures per month Those device locations range from -50 to +125 degrees).

Digital non-contact multichannel telemetry complex is presented in Fig. 1, where indicated: 1 - a rotor unit containing a rotor antenna system, in which high-frequency data transmission antennas and receiving antennas power antennas are structurally fixed. With the rotor of the antenna system the holder of the modules is rigidly fixed. In the holder of the modules are placed the terminal blocks of the antennas and up to 8 measuring modules and power stabilizers. The connection of modules, stabilizers and antennas is performed by a backplane, which also contains a connector for connecting sensors. All parts of the unit are rigidly fixed on the shaft of the test product; 2 - a stator unit with an antenna system, comprising a holder in which a receiving high-frequency antenna and a transmitting antenna for inductively pumping power are structurally fixed. The stator of the antenna system is fixed on the fixed part of the body of the test product; 3 - a unit for receiving, powering and visualization tools, which includes: a chassis for installing control and demodulation modules, power amplifiers of signals, a coordinator, an operator’s workplace.

The complex works as follows. The measuring modules receive data from the sensors, process them, filter and transmit in digital form via a high-frequency channel to the transmitting antennas of the rotor, while the data channel of each measuring module is redundant. Data from each measuring module is received by a separate receiver module, also having redundancy of the communication channel. The software controls the operation of the measuring modules, provides continuous data recording with the possibility of processing information in the pace of testing. A special protocol provides redundancy for data recovery when operating in a noise environment and ensures their reliability.

To achieve the required compactness and durability, special mounting technologies were used on 8-layer flexible boards and high-strength compounding, which simplifies the placement of the measuring system inside a working product, and the minimum distance from the sensors to the measuring system reduces the effects of noise and interference, which allows to obtain more accurate data. Each measuring module has duplicated high-frequency data transmission channels, which together with the antenna system allows you to connect up to 16 transmitters with a total bandwidth of at least 200 Mbit / s per complex, which allows you to significantly increase the flow of transmitted data and use more than 150 different measuring channels with a wide dynamic range of strain gauging channels (up to 60 kHz, with uneven amplitude-frequency characteristic (AFC) not more than 0.5 dB). This allows you to get all the necessary data with a minimum number of tests (the number of assemblies / disassemblies of the product for reassembling the sensors decreases), as well as registering highly dynamic processes in the entire required frequency range.

The measuring unit is equipped with built-in self-diagnostics and diagnostics of sensors and cable lines, as well as the ability to switch to redundant sensor groups when damage is detected, which significantly reduces the cost of re-testing caused by interruptions and short-circuits of sensors that inevitably arise during testing under extreme conditions.

The device has significantly expanded the possibility of registering parameters on remotely rotating and moving parts in difficult operating conditions. The inventive device can be basic when equipping test stands of gas turbine engines, gas turbine installations, onboard measurement systems.

Claims (1)

Digital non-contact multichannel telemetry complex consisting of a measuring unit, a stator unit, a reception and recording unit, power supply and visualization tools, characterized in that the measuring unit is made in the form of compact modules based on 8-layer flexible circuit boards filled with high-strength compounds operating in the range temperatures from minus 50 to +125 degrees and withstanding centripetal acceleration up to 40,000 g and vibrations up to 150 g, each measuring module having duplicate high-frequency transmission channels data, and the antenna system allows simultaneous connection of 16 transmitters with a total bandwidth per complex of at least 200 Mbit / s, with a dynamic range of strain gauge channels up to 60 kHz and with an uneven amplitude-frequency characteristic of no more than 0.5 dB, additionally equipped with a built-in the system of self-diagnostics of the state of sensors and cable lines, as well as the ability to switch to redundant groups of sensors, while the measuring and stator units are equipped with special screened en systems for the use of low-power high-frequency transmitters and induction power systems while ensuring the electromagnetic compatibility of the complex.

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