39results about How to "Frequency response width" patented technology

The invention provides a wireless intelligent Kegel pelvic muscle training device and a control method of the wireless intelligent Kegel pelvic muscle training device. Pelvic muscle pressure is collected through a thin-film pressure sensor, and biological feedback is performed according to the magnitude of the pressure, so that the vibration intensity of pelvic muscle training is adjusted; non-traumatic treatment is performed on postpartum women and uracratia patients through human-computer interaction so that the rehabilitation effect can be achieved. The wireless intelligent Kegel pelvic muscle training device has the ingenious advantages that a targeted training course can be performed according to the age group and the disease degree of the patients; treatment data of the training device can be compared with historical treatment data at different treatment stages in real time; accordingly, the treatment scheme can be adjusted and optimized, and therefore insufficient treatment or overtreatment is avoided.

The invention relates to the technical field of microphone sound head, in particular to a sound head polar plate of microphone, which includes a polar plate as well as a step through hole, a blind hole, a screwed hole, a chute, a screwed blind hole and an insulating post arranged on the polar plate; the central part of the polar plate is provided with a central hole; the surrounding of the central hole is provided with a plurality of through holes which are uniformly distributed; the polar plate is characterized in that the appearance of the polar plate is elliptical; the length of the long axis of the polar plate is 45mm-11mm and the length of the short axis of the polar plate is 44mm-10mm; the diameter of the through hole is 0.7-1.3mm; the through holes are arranged with mutually symmetrical central horizontal line and vertical line of the polar plate; compared with the prior art, the sound head polar plate of elliptical microphone has simple and novel structure, wide frequency response, flat frequency response, higher frequency response characteristics and directivity, and changes the sound head structure of the previous traditional microphone. Besides, the sound head polar plate of elliptical microphone is simple to be manufactured with obvious effects, and is worthy of popularization and application.

The invention discloses a test method for the mechanical properties of coal in a coal-rock combination under dynamic and dynamic and static combined loads. The existing test piece of the coal-rock combination is used to start with rocks that are not easy to be crushed, and the SHPB test device is used. The coal-rock combination is tested by pasting strain gauges, the stress of the coal is obtained from the stress at both ends of the coal specimen, and the coal-rock combination under dynamic load is obtained by inverse calculation based on the strain of the rock in the coal-rock combination. Variations in coal strain. The invention not only obtains the mechanical properties of coal in a certain surrounding rock environment, but also better guides on-site engineering practice, and has great guiding significance for revealing the real failure mechanism of engineering coal bodies.

The invention relates to a sensor device and method for testing the dynamic stress of an area array. The area array piezoelectric sensor consists of a number of independent piezoelectric stress sensors pasted on the flexible accessory board, the minimum spacing of which is the size of the sensor, and the wires of each sensor are collectively connected to the terminal. The sensor includes a metal protection layer, a rubber encapsulation layer, a piezoelectric film, an electrode adapter and a miniature charge amplifier. Each sensor is provided with a miniature charge amplifier and a resistor, the power input port and the signal output port are respectively connected with the amplifier, and the ground electrode of the sensor is connected with the power ground electrode. The invention includes an area array piezoelectric sensor, a connection terminal and an acquisition card, and the acquisition card is connected to a computer for data acquisition. The invention obviously improves the equivalent modulus and dynamic performance stability of the stress sensor, can accurately and simply test the dynamic stress distribution of the entire section of the subgrade, and can be used for testing the dynamic stress of the soil subgrade in fields such as railways, highways and airports.

The invention discloses a domestic sewage and dirt treater in a coal gas (CG) ultrasonic reverberation resonance field as well as a method and application for treating domestic sewage and dirt by using the treater, belongs to the technical field of water treatment, and particularly relates to a domestic sewage and dirt treater in the CG ultrasonic reverberation resonance field as well as a method and application for treating sludge / sewage by using the treater. The invention aims to solve the problem that the conventional equipment for treating the sludge and sewage by utilizing an ultrasonic technique is high in energy consumption. The product comprises a sewage and dirt inlet, a sewage dirt / bubble mixing chamber, a rotary distribution plate, a bowl-type shunt cover, a CG ultrasonic reverberation resonance field generator pipe main reactor, a filtering net, a sieve plate, a seal head, a sludge outlet and a treated water outlet. The treater disclosed by the invention can be independently used for treating pollution of industrial sewage, domestic sewage, agricultural wastewater and other natural water resources in rivers, lakes and seas and the like, or can be combined with a hydrogen peroxide method, an ozone oxidization method, an active iron catalysis method, a hypochlorite method or a Fenton oxidation process to be used for treating pollution of the natural water resources.

The invention relates to a straight tube multi-axis ratchet wheel strain testing system and a straight tube multi-axis ratchet wheel strain testing method. A hydraulic servo fatigue tester, a quasi three-point bent clamp and a strain gauge method measurement straight tube are controlled by using a sensor, data are acquired through a multi-channel dynamic strain meter, and results are output through a computer. According to the method, the testing position is flexible, and the load working conditions are diverse; and the method is novel, the design is reasonable, and the data are accurate and reliable. Meanwhile, the multi-channel dynamic strain meter has the characteristics of low drift, low noise and broad frequency response; and the fatigue tester has the functions of presetting, measuring, controlling and automatically recording the testing conditions and the testing parameters and automatically giving an alarm and halting the machine when the test is invalid or abnormal, can be widely applied to test and research of the evolution laws of multi-axis ratchet wheel strain of a pressure straight tube under various complex working conditions such as earthquake or temperature change of fluid in the tube and the like, and can be used for determining the ratchet wheel boundary of the straight tube.

The invention relates to a nonlinear correction microphone. The nonlinear correction microphone comprises a sensitive film, a base main body, a low-sensitivity rear polar plate, a high-sensitivity rear polar plate, a shielding cavity, a high-sound-pressure output electrode, a high-sensitivity output electrode and an amplification circuit board. A capacitor microphone with high sound pressure and low sensitivity and a capacitor microphone with low sound pressure and high sensitivity are compounded together, the same sound pressure is detected, the two capacitors share one diaphragm; the small area of the center of the rear pole plate is the rear pole of the high-sound-pressure capacitor microphone; the large area of the periphery of the rear pole plate is the rear pole of the low-sound-pressure condenser microphone, the output of the low-sound-pressure condenser microphone is approximately linear, the output of the high-sensitivity condenser microphone is nonlinear, and the output of the high-sensitivity condenser microphone is corrected by using the output signal of the high-voltage condenser microphone in the amplifier.

The invention discloses a piezoelectric intelligent torsional vibration control rod. The lower end of the hollow round rod is equipped with the first connecting block, the annular piezoelectric torsion driver, and the second connecting block sequentially from top to bottom, and the upper end of the hollow round rod is equipped with the third connecting block. Sensors are mounted on the inner or outer surface of the hollow rod. When there is torsional deformation or torsional vibration at the connection end relative to the connection end, the sensor detects that the signal is amplified in reverse and sent to the ring piezoelectric torsion driver, and the ring piezoelectric torsion driver generates a torsional torque that is opposite to the torsion deformation to suppress its deformation or vibrate. The rod integrates sensing and drive control, and has the advantages of compact structure, good control characteristics, low power consumption, and good vibration suppression effect. It can be widely used in the operating rods and truss structures of space robots, and in the field of active vibration control where torsional vibration needs to be suppressed (isolated).