38results about How to "Detection is accurate and intuitive" patented technology

The invention relates to a high-power multi-point injection misfire detection method and device for a gas engine. The high-power multi-point injection misfire detection method comprises the following steps: (1) a crankshaft signal panel arranged at the tail end of a flywheel, together with a crankshaft position sensor, acquires a crankshaft position signal; (2) a camshaft signal panel arranged on a camshaft, together with a camshaft position sensor, acquires a camshaft position signal; (3) the phase position of the engine is acquired according to the crankshaft position signal and the camshaft position signal, compression top dead centers of all cylinders of the engine are sequentially determined, and the crankshaft position sensor acquires the total tooth pulse width Varsum of working bend sections after compression top head centers of all the cylinders of the engine cylinder by cylinder; and (4) whether the engine is on fire or not is determined through the total tooth pulse width Varsum. Compared with the prior art, the high-power multi-point injection misfire detection device has the advantages of reasonable design, simple structure, small calculated amount, accurate judgment and the like.

The invention belongs to the technical field of road and bridge construction, and particularly relates to an apparent defect determination device for structural concrete, and a detection method implemented by the device. The apparent defect determination device for the structural concrete comprises magnetic devices and a magnetic powder filling device, and is electrically connected with a power supply in a cabinet, wherein the magnetic powder filling device is arranged on the side of a concrete component where an apparent defect is located; and the magnetic devices are arranged on the side opposite to the apparent defect, and the positions of the magnetic devices correspond to the position of the magnetic powder filling device for measurement. The invention further provides the detection method adopting the apparent defect determination device for the structural concrete. The device and the method provided by the invention have the advantages that magnetically conductive ferrous fillers sprayed by the magnetic powder filling device can be sucked into holes and cracks through the magnetic devices, and the magnetically conductive ferrous materials in irregularly shaped holes, cracksor honeycombs on the surface of the structural concrete can be quantitatively measured, so that the measurement equipment and method with high accuracy, simplicity and visualization can be provided for detection of the surface defect of the structural concrete.

The invention provides a matter distribution detection method based on phase retrieval. Firstly, a wave function that contains phase change information is retrieved by means of incident light intensity and diffraction light intensity of transparent matters according to a gerchberg-saxton (GS) algorithm; then phase change is calculated in the obtained wave function by a phase evaluation algorithm based on a gradient field in order to avoid phase folding; finally, three-dimensional distribution of matters can be obtained according to linear models of the matter three-dimensional distribution and phase change. By means of the matter distribution detection method based on the phase retrieval, morphology and distribution of the transparent matters can be visually and accurately detected, and reliability and accuracy are high.

The present invention discloses an engineering pipeline offset detecting device based on the cutting magnetic induction line principle, and relates to the technical field of construction engineering.The device comprises two bottom plates; the middle part of two opposite sides of the two bottom plates is movably connected with an adjusting mechanism; the front side of the adjusting mechanism is fixedly connected with a threaded sleeve; the inner part of the threaded sleeve is movably connected with a screw; and the front surface of the bottom plates is movably connected with three limiting blocks, the shape specifications of the three limiting blocks are the same, the limiting block is a curved structure, and the center of the limiting block is the same as the center of the bottom plate. According to the engineering pipeline offset detecting device based on the cutting magnetic induction line principle provided by the present invention, the change of the induced electromotive force when the conductor cuts the magnetic induction line is used to detect whether the workpiece is offset, and when the workpiece is offset, positions of the first conductor plate and the second conductor plate change; and the magnetic induction line is cut, and the induced electromotive force changes, so that by using the process and the principle, the position of the workpiece can be accurately and intuitively detected.

The invention discloses a method for detecting the azimuth of a damaged oilfield downhole casing. In the method, a casing detector (1) for detecting a casing is connected with a gyroscopic clinometer (2), or an azimuth measuring mechanism (3) is mounted in the casing detector (1); the position of a probe of the casing detector (1) can be calculated by measuring the inclination of the gyroscopic clinometer (2) or the position of the azimuth measuring mechanism (3), and thus, the specific azimuth of the damaged position of the casing can be calculated. In the invention, the specific azimuth of the damaged position of the casing can be visually and precisely detected, and the method has the characteristics of high detection accuracy and less detection error and is simple and convenient to operate. The invention perfects the detection means of the downhole casing and provides important foundations for oilfield downhole analyses. The invention is applicable to the azimuth test of all downhole detection parameters.

The invention relates to self-piercing riveting quality online detection system and method in the technical field of machining. The system comprises a weighing sensor, a displacement sensor, a weighing sensor amplifier, a displacement sensor amplifier, a data acquisition card and a calculation module. According to the invention, whether the joint quality is qualified or not is judged through acquiring the force-time and displacement-time curves in the self-piercing riveting process according to one feature window and three feature tolerance ranges on the acquired curves and the defect type towhich qualified joints belong is also judged. The method gives consideration to the changes of the displacement and the force in the riveting process, has the characteristics of sensitivity to defects like plate gaps and the like, high defect detection speed and the like and can specifically detect various defects.

The invention relates to a test device for roller damping, which comprises a contact roller wheel, a driving motor, a pressure sensor, a control module, a sensor and a display module, wherein the contact roller wheel is provided with a translation mechanism; the driving motor is used for driving the contact roller wheel to rotate; the pressure sensor is used for detecting the pressure born by the contact roller wheel; the control module is used for receiving a signal of the pressure sensor; the rotation of the driving motor and the translation of the contact roller wheel are controlled by the control module; the sensor is used for detecting the rotation of a tested roller and transmitting a detecting result to the control module; and the display module is connected with the control module and is controlled by the control module. The test device for roller damping is used for testing the roller damping.