13results about How to "Avoid experimental error" patented technology

The invention discloses a nonlinear support system and a hypersonic velocity sweep / fixed frequency wind tunnel test method, and belongs to the technical field of wind tunnel tests. The device comprises a protection platform, a protection cover, a lifting platform, a vertical mounting plate, a protection cover shoulder split, a test model and a driving mechanism, the test model is mounted at the top of the vertical mounting plate through the driving mechanism, the vertical mounting plate is mounted on the lifting platform, the protection cover is mounted on the protection platform, and the protection cover shoulder split is arranged at the top of the protection cover. The vertical mounting plate and the driving mechanism are arranged in the protective cover; and the test model at the top of the vertical mounting plate extends out of the protective cover shoulder cleft of the protective cover. The technical problem that in an existing hypersonic wind tunnel test, structural nonlinear factors such as gaps, friction and collision between kinematic pairs of an executing mechanism are ignored due to a simplified supporting mode, and consequently the influence of the performance of the executing mechanism in a complex vibration environment cannot be truly reflected by a test result is solved. And a reliable test means is provided for revealing a structural nonlinearity and pneumatic nonlinearity coupling effect rule.

This utility model relates to the field of organ-on-a-chip technology, specifically a variable adaptive organ-on-a-chip fixture, including a lower clamp assembly, a sealing ring, an upper clamp assembly, locking screws, a clamp assembly, and connecting screws. Its key feature is that the upper and lower clamp assemblies are hinged together by the connecting screws, and both assemblies can be stretched and locked along their length. The upper clamp assembly has a sample inlet / outlet port, and the clamp assembly is fitted into the inlet / outlet port to fix the infusion tube. One section of the inlet / outlet port has an annular groove. In this variable adaptive organ-on-a-chip fixture, the upper clamp assembly engages with the insertion groove of the stretching upper clamp through the insertion shaft of the base upper clamp, and the lower clamp assembly engages with the guide groove of the stretching lower clamp through the guide shaft of the base lower clamp. It can be freely stretched along its length and locked by the locking screws, adapting to organ-on-a-chips with different length specifications without requiring replacement of the entire fixture set, thus solving the specification constraints of traditional fixtures that require only one clamp per chip.

This utility model relates to the field of rat smoking technology and discloses a rat smoking device, including a smoking chamber, a three-way valve, a smoking chamber, and an extraction and delivery component. The three ends of the three-way valve are detachably connected to a first hose, a second hose, and a third hose, respectively. The first hose is detachably connected to the smoking chamber. The smoking chamber is detachably connected to the third hose, and the smoking chamber can be used for burning cigarettes. The extraction and delivery component is detachably connected to the second hose and is used to draw the smoke from the burning cigarette in the smoking chamber through the third hose, the three-way valve, and the second hose. This utility model proposes a rat smoking device that generates smoke through the smoking chamber, which is then delivered to the smoking chamber via hoses and a three-way valve to smoke the rats, simulating the smoking process and avoiding experimental errors. Simultaneously, fresh air is introduced and smoke is expelled, simulating a natural smoking environment, diluting the smoke concentration, ensuring the survival safety of the rats, extending the smoking time, and obtaining more data on the chronic development of COPD.

The invention relates to the technical field of ultraviolet crosslinking devices, and discloses a multiband ultraviolet crosslinking instrument which comprises a light source module which is composed of a plurality of UVA, UVB and UVC band LED lamp beads capable of being independently controlled and arranged to form an area light source; the sensor module comprises ultraviolet sensors corresponding to three wave bands of UVA, UVB and UVC respectively and is used for detecting the ultraviolet light intensity of each wave band in real time; the human-computer interface is used for receiving a feedback signal of the sensor module; the ultraviolet cross-linking instrument effectively solves the problems that an existing ultraviolet cross-linking instrument adopts a plurality of ultraviolet lamp tubes to irradiate experimental materials in a cavity, a power control mode is that the lamp tubes are detached and replaced with lamp tubes with different light source wavelengths to irradiate in different wave bands, the lamp tubes are not surface light sources, the lamp tubes can cause uneven irradiation in the cavity, and the irradiation efficiency is low. The ultraviolet light intensity received by each area on the surface of the sample is inconsistent, so that the problem of experimental errors caused by non-uniform illumination can be solved.

The application discloses a kind of laser calibration devices of thin-walled shell axial compression test, it is related to the technical field of axial compression test, including laser calibration instrument system, control unit, servo motor, screw adjusting mechanism and clamping mechanism;Laser calibration instrument system is integrated with clamping mechanism, control unit is respectively connected with laser calibration instrument system, servo motor, screw adjusting mechanism and clamping mechanism, realizes closed-loop control, laser calibration instrument system and clamping mechanism adopt same reference coordinate system;Clamping mechanism is used for the nondestructive positioning and locking of thin-walled shell;The clamping end surface of clamping mechanism is embedded with pressure sensor;Laser calibration instrument system is used for real-time monitoring thin-walled shell displacement and positioning deviation, cooperates control unit, servo motor and screw adjusting mechanism to complete dynamic calibration.The application can realize the high-precision positioning and calibration of composite thin-walled shell in axial compression test process, and can avoid stress concentration when the shell is clamped and fixed, realize the nondestructive clamping and locking of shell.

The utility model relates to the technical field of physical experiment teaching aids, in particular to a simple harmonic motion experiment instrument, which comprises a base, a liquid spraying device, a support arranged on the base and a paper feeding device arranged on the base, the support comprises a cross rod, a first vertical rod and a second vertical rod, the first vertical rod and the second vertical rod are arranged on two opposite sides of the cross rod, and the cross rod is provided with a cycloid and connected with a pendulum ball. A gap exists between the lowest point of the swing ball in the natural state and the base, a spring is fixed to the first vertical rod and is horizontally placed in the natural state, one end of the spring is detachably connected with the swing ball, the liquid spraying device comprises a spraying pipe, and the liquid outlet end of the spraying pipe is fixedly connected with the swing ball; a spring oscillator experiment and a simple pendulum experiment are integrated on one device, so that students can conveniently compare two simple harmonic motion phenomena on the same platform, the essence and generality of the simple harmonic motion can be deeply understood, and the teaching effect is optimized. Meanwhile, through the detachable connection design, quick switching between a spring oscillator experiment and a simple pendulum experiment is facilitated, and different experiment requirements are met.

This utility model provides a testing device for compressors, relating to the field of compressor testing technology. The testing device includes: a base; a connecting assembly connected to the base, the connecting assembly being movably disposed relative to the base along a preset direction, the connecting assembly having multiple working positions, and the connecting assembly being used to connect to the compressor to be tested; and a locking assembly connected to the connecting assembly, the locking assembly having a locking position for locking the connecting assembly and a releasing position for releasing the connecting assembly. When the connecting assembly moves relative to the base along the preset direction to each working position, the locking assembly is in the locking position, adapting to the precise installation and adjustment of the compressor to be tested under different testing requirements, thus solving the problem of inconvenient position adjustment and fixation of electric air compressors in the prior art.

The utility model discloses a section staining rack for an immunohistochemical experiment, which comprises a base, a vertical shaft is vertically and upwards arranged in the middle of the base, a sleeve is sleeved outside the vertical shaft, an upper tray is arranged at the upper part of the sleeve, a lower tray is arranged at the lower part of the sleeve, and the upper tray comprises an upper inner ring disc and an upper outer ring disc. The lower tray comprises a lower inner ring disc and a lower outer ring disc, clamping grooves are correspondingly formed in the outer side of the upper inner ring disc, the inner side of the upper outer ring disc, the outer side of the lower inner ring disc and the inner side of the lower outer ring disc around the center of the sleeve in a radial mode, and glass slides with wax sealing slices are inserted into the clamping grooves. The utility model aims to provide the section staining rack for the immunohistochemical experiment, which can be used for more sufficiently staining sections by rotating the staining rack, has a good staining effect, is beneficial to clear observation under a microscope and avoids experimental errors.

The utility model belongs to the technical field of batteries, and discloses a combined mask plate, coating equipment and a solar cell module, the combined mask plate comprises a first separator, a second separator and a frame, the first separator has different lengths, the second separator has different lengths and is provided with a through structure, and the frame is provided with a through hole. The frame comprises a first fence plate and a second fence plate, a first inserting structure is arranged on the first fence plate, and a second inserting structure is arranged on the second fence plate. By adjusting the number and the length of the first partition pieces and the second partition pieces arranged in the frame, various containing spaces with different sizes are formed in the frame so as to adapt to products with different specifications and sizes in the same batch to be subjected to a sputtering or evaporation process, the universality is high, the production cost is reduced, and the production efficiency is improved. Experiment errors caused in the multi-batch test process are avoided, and the obtained experiment result is more accurate.

The utility model relates to a kind of multifunctional paraffin prevention experimental device, including base, outer tube, limiting cylinder, wax pipe, temperature sensor and motor;The wax pipe is placed in limiting cylinder, and the outer tube bottom end is fixed on base, multiple limiting cylinders are set in outer tube inside at equal intervals, temperature sensor and heating coil are installed in each limiting cylinder, the temperature sensor is embedded on the limiting cylinder inner wall, and the heating coil is evenly arranged on the limiting cylinder inner wall;Rotary piece is provided at the bottom of limiting cylinder, and the motor is set in the base inside below rotary piece, and the transmission shaft of motor is fixedly connected with rotary piece.The utility model relates to multifunctional paraffin prevention experimental device can be used for exhibition wax influencing factor analysis and paraffin prevention experiment.

This invention discloses a method for analyzing the influence of stress on ultrasonic harmonics based on molecular dynamics, belonging to the field of discrete solution technology. The method includes establishing an unloaded model that satisfies ultrasonic wave propagation. Prestressed models with different stress magnitudes and directions are prepared, and dislocation nucleation is monitored to achieve real-time diagnosis and storage of the stress state. Hanning-modulated sinusoidal ultrasonic waves are applied to atoms within each prestressed model interval to avoid disturbances caused by new energy propagating the ultrasonic waves in the NVE ensemble. The trajectory file is post-processed and analyzed to identify the ultrasonic wave propagation process under stress. The model is divided into single-layer atomic regions along the X-axis, and the acoustic signals of ultrasonic waves passing through each region are extracted. The harmonic generation process is obtained through wavelet transform, the linear accumulation interval of harmonics is determined, the cumulative slope is extracted, and the influence of stress on the ultrasonic harmonic generation efficiency is analyzed.

The utility model relates to a kind of FRP grid strip concrete test block making device embedded, belong to building engineering technical field, including the mould of upper opening, FRP grid is inserted in the inside of mould, and the both ends of FRP grid are fixedly connected with mould by fixed rope ring;Strip steel sheet is also inserted in mould, and strip steel sheet is vertically arranged, and FRP grid passes through strip steel sheet.It is realized that FRP grid is accurately positioned and stably fixed in mould, break through the limitation that existing mode can only paste FRP sheet on the surface of test block, and the concrete test block embedded with FRP grid can be prepared;Meanwhile, the cooperation of strip steel sheet and FRP grid can simulate the state that FRP grid is embedded in the inside of concrete in actual engineering, so that test block can truly reflect the synergistic effect of FRP grid and concrete under engineering scene, and provide test block carrier in conformity with test demand for studying crack suppression mechanism of embedded FRP grid.

This utility model relates to the field of anchor mechanical performance testing technology, and more particularly to a mechanical performance testing device, including a gantry frame and a base. The gantry frame is fixed on the base, and a pull-out hydraulic cylinder is installed on its top. A square enclosure is fixed on the base directly below the gantry frame. The lower end of the pull-out hydraulic cylinder is a telescopic end, on which a tension sensor is installed. An anchor clamp for holding the anchor rod is connected to the lower side of the tension sensor. Pressure-applying hydraulic cylinders are installed on the four sides of the enclosure. The telescopic end of the pressure-applying hydraulic cylinder is located inside the enclosure, and a pressure plate is provided on it. A serpentine electric heater is embedded on the side of the pressure plate opposite to the pressure-applying hydraulic cylinder. This utility model can accurately test the anchoring performance of anchor rods under high temperature and high pressure environments. By working in concert with the pull-out hydraulic cylinder and the pressure-applying hydraulic cylinder, a multi-dimensional stress environment simulation is achieved. The electric heater and sensor ensure the authenticity of the test conditions and the accuracy of the data.