37results about How to "High reliability of test results" patented technology

The invention discloses a comb plate stress detecting device of an escalator. The comb plate stress detecting device comprises a guide part mounted on a step, a tension meter fixedly arranged on the guide part and a pushing frame movably arranged on the guide part, wherein the pushing frame can move left and right under the guide effect of the guide part; one end of the pushing frame is in contact with the end part of the comb plate; the stress end of the tension meter is fixedly connected with the pushing frame; when the step moves in a direction getting close to the comb plate, the guide part moves in the direction getting close to the comb plate under the driving of the step; under the tension effect of the stress end of the tension meter, the pushing frame abuts against the comb plate; and the tension meter can be used for detecting stress of the comb plate. According to the comb plate stress detecting device, the pushing frame can abut against the comb plate, the guide part can move in the direction getting close to the comb plate along with the step, and the tension meter can accurately detect the size of stress between the comb plate and the step, so that the flexibility of the comb plate can be judged. The detecting device is simple in structure, is convenient in detection, is sensitive in detection, and is high in detected result reliability.

The invention discloses a comb plate stress detecting device of an escalator. The comb plate stress detecting device comprises a guide part mounted on a step, a tension meter fixedly arranged on the guide part and a pushing frame movably arranged on the guide part, wherein the pushing frame can move left and right under the guide effect of the guide part; one end of the pushing frame is in contact with the end part of the comb plate; the stress end of the tension meter is fixedly connected with the pushing frame; when the step moves in a direction getting close to the comb plate, the guide part moves in the direction getting close to the comb plate under the driving of the step; under the tension effect of the stress end of the tension meter, the pushing frame abuts against the comb plate; and the tension meter can be used for detecting stress of the comb plate. According to the comb plate stress detecting device, the pushing frame can abut against the comb plate, the guide part can move in the direction getting close to the comb plate along with the step, and the tension meter can accurately detect the size of stress between the comb plate and the step, so that the flexibility of the comb plate can be judged. The detecting device is simple in structure, is convenient in detection, is sensitive in detection, and is high in detected result reliability.

The present invention provides a step-down DC conversion circuit structure, including a BUCK circuit structure, and the BUCK circuit structure includes a first voltage stabilizing capacitor, a second voltage stabilizing capacitor, a first voltage dividing resistor and a first voltage stabilizing capacitor. Two voltage-dividing resistors, wherein the first voltage-stabilizing capacitor and the second voltage-stabilizing capacitor are arranged in parallel to form an accommodating channel, and the first voltage-dividing resistor and the second voltage-dividing resistor are arranged on the The accommodating channel between the first voltage stabilizing capacitor and the second voltage stabilizing capacitor prevents the operator's fingers from touching the first voltage dividing resistor and the second voltage dividing resistor.

The invention provides a rapid system model parameter identification method based on a wide frequency spectrum excitation signal, and belongs to the technical field of inertial testing. Firstly, the excitation signal considering the richness of signal frequency spectrum contents is designed, and an overload generated by the excitation signal is within an allowable range by understanding a workingenvironment of inertial instrument testing equipment; and due to the fact that position information is represented by the excitation signal, a first-order derivative and a second-order derivative arecalculated to obtain speed and acceleration, a formula capable of obtaining the time of any frequency and obtaining the frequency of any time for an input signal is introduced, and according to a relation between an initial frequency and a cut-off frequency, the time of arriving at the frequency is determined, and relevant parameters are calculated. The excitation signal is novel in form and highin innovation; and the richness of the signal contents is greatly improved compared with the prior art, so that an actual working state of a system can be restored more realistically, various parameters in the system can be more comprehensively excited, and the reliability of a testing result is improved.

The invention provides a deep beam test piece for a rock I-II composite fracture toughness test. The deep beam test piece has a rectangular main body. The main body is provided with an opening along a center line in a main body lower end surface thickness direction, and the opening extends into the main body and goes through cutting grooves arranged at the front and rear end surface along a main body thickness direction. An included angle beta of the surface of the cutting groove (2) and the cross section of the test piece main body perpendicular to the length direction is greater than or equal to 0 degree and less than or equal to 60 degrees. The width W of the test piece main body is controlled in a range of 0.5L+ / -0.01L. The thickness B of the test piece main body is 0.4 times greater than or equal to the length L and is greater than or equal to 30mm. L represents the main body length. The invention also provides a rock I-II composite fracture toughness test method utilizing the deep beam test piece. The deep beam test piece has a simple structure, is conducive to rock block processing, and realizes a rock I-II composite fracture toughness test in the whole composite loading zone from the pure I-type zone to the pure II-type zone.