15results about How to "High frequency response" patented technology

The invention belongs to the technical field of dynamic temperature testing, and particularly relates to a dynamic total temperature probe based on double film platinum resistors, which comprises a probe head, a probe support rod, two film platinum resistors and two lead holes. The head of the probe is in a semi-spherical shape and directly faces a main stream to form a vertical section, the two thin-film platinum resistors are arranged on the section along the axis of the probe, leads of the thin-film platinum resistors are led out through lead holes located behind the thin-film platinum resistors, a four-wire system connection mode is adopted, and a cylindrical surface of a supporting rod of the probe and the vertical section are in a Vitdosski curve shape. The calibration and measurement data processing method provided by the invention greatly improves the measurement frequency response and the measurement precision of the probe, is suitable for measuring the transient temperature fields of the inlet, the outlet and the interstage of the turbomachinery, can quickly and accurately measure the transient temperature change of the turbomachinery under different working conditions, and provides a technical means for the transient temperature measurement of the turbomachinery.

The invention belongs to the technical field of dynamic temperature testing, and particularly relates to a dynamic total temperature probe comb for measuring a thin film platinum resistor of an unsteady flow field, which comprises a probe support rod, a positioning block, a probe, a thin film platinum resistor, a circular pipeline and a lead hole. A circular pipeline is arranged in the probe supporting rod, a positioning block is arranged at the tail of the probe supporting rod, the probes are cylinders with circular truncated cones at the heads, the number of the probes is determined according to measurement requirements, the probes are fixed to different spanwise measurement positions of the probe supporting rod respectively, and lead holes are formed in the centers of the top faces of the circular truncated cones of the probes and communicated with the circular pipeline. And a film platinum resistor is arranged above the lead hole, and a film platinum resistor lead passes through the lead hole and the circular pipeline and is led out from the tail part of the probe. The dynamic total temperature probe comb of the film platinum resistor for measuring the unsteady flow field is calibrated, is suitable for measuring the distribution of the dynamic total temperature of the unsteady flow field of turbomachinery along the height direction of a blade, and can simultaneously measure incoming flow parameters of a plurality of spatial positions, shorten the measurement time to the greatest extent and reduce the test cost compared with the existing dynamic temperature measurement probe.

The application discloses a sheet type integrated platinum film heat flow sensor for a hypersonic shock tunnel, which comprises a glass substrate in a sheet shape, a plurality of platinum thin film lines arranged on the surface of the glass substrate along the width direction of the glass substrate, and silver paste contacts corresponding to the platinum thin film lines arranged on the side edges of the glass substrate and electrically connected with the platinum thin film lines, wherein the end of the silver paste contact away from the platinum thin film line is used for welding a lead wire. The sheet type integrated platinum thin film line resistance sensor has the characteristics of high frequency response of a two-millimeter-diameter thin film sensor. After the thickness of the glass substrate as a sensor bearing substrate is reduced, the sensor can be applied to a particularly thin part of an aircraft for heat measurement, and a measurement point with a gradient range is formed on the glass substrate, so that the aerodynamic heat of the aircraft surface with a certain gradient can be measured.

The utility model discloses a headrest loudspeaker, and relates to the technical field of loudspeakers. The headrest loudspeaker comprises a loudspeaker system and a shell system, the shell system comprises a front balancer, a basin stand and a rear shell which are fixedly connected in sequence, and the middle of the basin stand is hollowed out and used for containing and installing the loudspeaker system; and a sealed independent sound cavity structure is formed among the loudspeaker system, the basin frame and the rear shell. According to the headrest loudspeaker provided by the embodiment of the invention, the acoustic performance of the loudspeaker system can be optimized, the vibration subsystem in the loudspeaker system can be protected and the frequency response of the loudspeaker can be improved while no additional space is occupied, so that the sound effect of a vehicle-mounted sound system and the riding experience of a driver and passengers can be improved.

The utility model provides an anti-fatigue low-friction high-frequency response miniature spring for a pneumatic assembly, and relates to the technical field of miniature springs, the anti-fatigue low-friction high-frequency response miniature spring comprises a spring and an upper fixing sleeve, the middle of the outer side surface of the spring is tightly wrapped with a middle leather sheath, the left and right parts of the outer side surface of the spring are tightly wrapped with side leather sheaths, and a reinforcing core is arranged in the center in the spring. The upper portion of the spring is sleeved with an upper fixing sleeve, the lower portion of the spring is sleeved with a lower fixing sleeve, the upper fixing sleeve and the lower fixing sleeve are the same in structure, the thickness size of the middle leather sheath is half of that of the side leather sheath, the middle leather sheath and the side leather sheath are made of silicon rubber materials, the reinforcing core is made of beryllium copper alloy materials, and the reinforcing core is made of aluminum alloy materials. And the cross section of the reinforcing core is of a circular structure. Abrasion is reduced in the back-and-forth rebounding process of the spring, the fatigue resistance is quite high, sleeving is safer and more stable, compression and rebounding are safer and more stable, and the spring is not prone to slipping in the compression process, higher in frequency response and durable.

The invention belongs to the technical field of dynamic temperature testing, and particularly relates to a film platinum resistor dynamic total temperature probe for measuring a transonic flow field, which comprises a probe head, a probe support rod, a film platinum resistor, a lead hole and a circular pipeline. The probe head is of a wedge-top double-arc prism structure, a thin film platinum resistor temperature sensor is installed at the wedge position, and a thin film platinum resistor wire is led out through a lead hole and a circular pipeline to be connected with external collecting equipment. During measurement, the windward side of the probe head comprises a wedge-top inclined face, a left side face and a right side face, and the leeward side is a cylindrical face. The calibration and measurement data processing method provided by the invention greatly improves the measurement frequency response and the measurement precision of the probe, is suitable for measuring the transient temperature field of the inlet, outlet and interstage transonic flow fields of the turbomachinery, can quickly capture the transient temperature change information of the turbomachinery under different working conditions, and improves the measurement accuracy of the turbomachinery. And an efficient and accurate means for measuring transonic unsteady flow field parameters is provided for turbine experiments.

The utility model belongs to the technical field of high-temperature pressure testing, and discloses a dynamic static pressure measuring device for high-temperature airflow, which is suitable for dynamic static pressure measurement of turbine inlets, turbine outlets and interstage wall surfaces. Comprising a cylindrical supporting rod, a pressure sensing hole, a dynamic pressure sensor, a pressure measuring channel, a water inlet channel, a water outlet channel, a partition plate, a cavity, a multifunctional positioning block, a fixing thread and a cable. The axis of the pressure sensing hole coincides with the axis of the supporting rod and communicates with the dynamic pressure sensor through the pressure measuring channel. The supporting rod is of a double-layer coaxial structure, the inner layer and the outer layer are divided by a vertically-arranged partition plate to form a water inlet channel and a water drainage channel, the sections of a water inlet and a water outlet are smoothly transited from a cashew nut shape to a round shape, and the flow area is constant. The lower end of the supporting rod is provided with a fixing thread and is matched with a multifunctional positioning block for positioning and fixing with the wall surface of the casing, thereby realizing dynamic static pressure measurement of the wall surface in a 2000K environment.

The invention belongs to the technical field of dynamic temperature testing, and particularly relates to a film platinum resistor dynamic total temperature probe for measuring a three-dimensional unsteady flow field, which comprises a probe head, a probe support rod, a film platinum resistor, a lead hole and a circular pipeline. The probe head is of a wedge-top double-arc prism structure, the leeside of the probe head is a cylindrical rear arc surface, the windward side comprises a wedge-top inclined surface, a cylindrical front plane, a left side plane and a right side plane, the left side plane and the right side plane are symmetrical, the windward side is provided with four lead holes which are not communicated with each other and are respectively communicated with the circular pipeline, and the four film platinum resistors are installed on the lead holes. And the film platinum resistor cable is led out of the tail part of the probe through the corresponding lead hole via the circular pipeline in the probe support rod. Through calibration of a calibration wind tunnel, compared with an existing temperature probe, the three-dimensional unsteady flow field temperature probe can measure changes of the total temperature, the static temperature, the deflection angle, the pitch angle and the Mach number of a three-dimensional unsteady flow field along with time, and a means for efficiently and accurately measuring unsteady flow field parameters is provided for turbine experiments.

The utility model relates to a novel high pressure differential pressure core structure, which is characterized by comprising a sintering base, a pressure sensing chip, a pressure sensing diaphragm, a ceramic pad, a chip body and a pressing ring, the pressure sensing chip is arranged in the sintering base, the pressure sensing diaphragm is arranged in the sintering base, a gold wire is arranged on the chip body, and the ceramic pad is arranged on the pressing ring. The sintering base seals the stainless steel sintering base in a glass insulator sintering mode, four groups of pins are led out, the chip body is connected to the pins on the sintering base through gold wire binding wires, and the other end of the chip body presses the pressure sensing diaphragm through the pressing ring. According to the utility model, the high-performance silicon piezoresistive pressure sensing chip is adopted and is assembled by using an all-welded sealing structure, the silicon oil is filled in a high-vacuum environment, and the measuring diaphragm made of hastelloy isolates a measured medium from the pressure sensing chip, and also enables the core body to reliably measure pressure signals of various strong corrosive media for a long time.

This invention provides a valve sleeve spiral positioning and guided electro-hydraulic proportional servo valve. The electro-hydraulic proportional servo valve includes a spool valve assembly, an oil port changing plate at the left end of the spool valve assembly, and an electric actuator at the right end of the spool valve assembly. A valve core that can slide in the axial direction is disposed inside the spool valve assembly, and the valve core portion is inserted into the electric actuator. A guide-stage valve sleeve is rotatably connected inside the electric actuator, and the guide-stage valve sleeve is connected to the valve core insertion portion. A guide structure is provided between the valve core insertion portion and the guide-stage valve sleeve. This invention successfully reduces the moment of inertia, enabling the motor to drive the valve core movement with lower torque output. Furthermore, this invention can also reduce the subsequent maintenance costs of the servo valve.

The invention provides a jet servo valve closed magnetic circuit magnetizing device and method and a torque motor deviation adjusting method. The jet servo valve closed magnetic circuit magnetizing device comprises a U-shaped magnetic conducting block (2), a magnetic isolating block (3), a locking screw (4) and a magnetizing limiting block (5). The magnetic steel (1) to be magnetized and the magnetic isolating block (3) are arranged in the U-shaped magnetic conducting block (2); the magnetic steel (1) to be magnetized is positioned at the opening of the U-shaped magnetic conductive block (2); the locking screw (4) is connected with the magnetic isolating block (3) and the U-shaped magnetic conducting block (2) so as to press the magnetic isolating block (3); and all the parts are placed in a magnetizing coil (6) of a magnetizer through a magnetizing limiting block (5). The magnetic performance of the magnetic steel can be brought into full play, the gain of the torque motor is improved, and meanwhile various performance of the servo valve under the large bias condition can be guaranteed.

The invention relates to a differential capacitive sensor signal reading circuit and a frequency response adjusting method thereof. The reading circuit comprises an alternating current carrier signal generating circuit, a double-arm differential bridge measuring circuit, a signal demodulation circuit and a signal amplification and frequency response adjusting circuit. Wherein the core measurement circuit of the differential capacitance sensor comprises two parallel capacitance arms and is used for converting the displacement amount d sensed by the sensor into an amplitude modulation signal Uo; the differential capacitance sensor is used for converting the capacitance variable quantity of the differential capacitance sensor into an electric signal and ensuring that a linear relation exists between signal output voltage and the capacitance variable quantity. Through the ingenious circuit design, nonlinear errors are effectively reduced, the signal reading precision is improved, the accuracy and stability of output signals of the sensor are ensured, and the sensor is particularly suitable for high-precision measurement and detection application; and the frequency response is improved, and the anti-interference capability is enhanced.

A concentric annular plasma fuel activation device for the injector rod of a ramjet combustion chamber is provided, comprising a combustion chamber housing (1), an injector rod (2), a flame stabilizer (3), an outer ring low-pressure electrode (4), and an inner ring high-pressure electrode (5). The outer ring low-pressure electrode (4) consists of a circular outer ring body (6), an outer ring fixing rod (7), and an outer ring discharge contact (8). The inner ring high-pressure electrode (5) consists of an inner ring high-pressure terminal (9), an inner ring body (10), and an inner ring discharge contact (11). To achieve insulation between the inner ring high-pressure terminal (9) and the combustion chamber housing (1), a hollow cylindrical inner ring fixing sleeve (12) is designed. A method for activating concentric annular plasma fuel for the injector rod of a ramjet combustion chamber is also provided. This invention addresses the problems of difficult ignition and low combustion efficiency of ramjet combustion chambers under low operating conditions. This invention employs an innovative sliding arc plasma excitation device after the fuel injector rod in the ramjet combustion chamber, which can optimize the working performance of the ramjet combustion chamber over a wide range of incoming flow parameters without the need for an external geometrically adjustable mechanism.

The invention discloses a preparation method of a pn junction film-based surface acoustic wave sensor for hydrogen sulfide detection. The preparation method comprises the following steps: 1, respectively preparing CuO sol and TiO2 sol by taking a copper-containing compound and a titanium-containing compound as precursors, and compounding the CuO sol and the TiO2 sol to obtain CuO-TiO2 composite sol; and 2, coating the composite sol on a surface acoustic wave resonator, performing high-temperature annealing, and then connecting a circuit to obtain the pn junction film-based surface acoustic wave sensor. The pn junction formed by CuO and TiO2 significantly improves the sensing performance of the surface acoustic wave sensor on hydrogen sulfide gas. The sensitivity at room temperature is high, the selectivity and the stability are good, and the sensor can be used in a high-humidity environment.

The invention discloses a high-precision wheel speed sensor, and relates to the field of wheel speed sensors, the high-precision wheel speed sensor comprises a front wheel sensor assembly and a rear wheel sensor assembly, the front wheel sensor assembly comprises a front sensor sensing head, the rear end of the front sensor head is provided with a front sensor shell, and the front end of the front sensor sensing head is provided with a fluted disc. The front wheel sensor assembly and the rear wheel sensor assembly are arranged, the front wheel sensor assembly is based on an electromagnetic sensor, and a magnetoelectric wheel speed sensor is high in dynamic measurement capacity, is installed on a front wheel and is more reliable and safer, and the rear wheel sensor assembly is based on a Hall wheel speed sensor. The output signal voltage amplitude is not affected by the vehicle speed, the frequency response is high, the wheel speed sensor is installed on the rear wheel, the rotating speed of the rear wheel can be detected in time, air cleaning is conducted on the protection cover, metal chippings are removed, the service life of the wheel speed sensor is prolonged, and the situation that in the vehicle running process, splashed broken stones and other objects impact and damage the socket is avoided.