84 results about "Stepping test" patented technology

A computer-based apparatus and method for automated data screening and selection in model identification and model adaptation in multivariable process control is disclosed. Data sample status information, PID control loop associations and internally built MISO (Multi-input, Single-output) predictive models are employed to automatically screen individual time-series of data, and based on various criteria bad data is automatically identified and marked for removal. The resulting plant step test/operational data is also repaired by interpolated replacement values substituted for certain removed bad data that satisfy some conditions. Computer implemented data point interconnection and adjustment techniques are provided to guarantee smooth/continuous replacement values.

A multivariable process controller controls a chemical, polymer or other physical process. Slow tuning and over-conservative controlled variable values are employed during step testing. While all controlled process variables are within safe limits, only one manipulated variable (MV) at a time is step changed. Several manipulated variables are moved when process variables exceed safe limits to ensure that the controlled process variables return to the safe range, such that suitable MV targets for step testing are able to be automatically discovered within a closed loop control environment. Thus, the step test is able to be conducted mostly unsupervised and/or remotely via a telephone or network connection. A new process perturbation approach simultaneously perturbs multiple or all of the process input variables in such a way that the process responses (process outputs) are maximized, while the process variables are maintained inside its predefined operating constraints. It uses magnitude modulated Generalized Binary Noise (MGBN) signals to excite multiple process variables, and uses a specially designed model predictive controller (MPC) to safeguard the process. The specially designed MPC controller uses minimal move and discrete control action to reduce interference with the GBN perturbations and prevents unwanted feedback from contaminating the data quality, while keeping the process operating in a desired range.

A control circuit for high-speed test of RAM is disclosed, which is based on hardware logic for correct location of failure and high test efficiency. Its test method includes such steps as setting up the state of test command register, choosing test type, strobing test register, testing data lines by comparison, testing address lines by comparison, step test of memory units, and analyzing error type by reading state registers.

An image forming apparatus includes a transfer device, a voltage applicator, a current sensor, and a discharge detector. The transfer device transfers a toner image from one surface to another by developing an electrical field across a transfer gap when provided with a transfer bias. The voltage applicator applies a stepped test voltage to the transfer device. The current sensor senses a current flowing to the transfer device during application of the test voltage the discharge detector detects an electrical discharge occurring in the transfer gap based on a rate of increase of the sensed current.

The present invention belongs to the field of multi-variable system application technology. Via one set of simple and practical step response test, the distinction in powerfully coupled multi-variable system is amalyzed into the distinction in several single-in single-out systems so as to obtain precise transfer function model of the multi-variable system. Specially, the process includes four steps of initialization, step response test, synthesis of multi-variable process and parameter distinction in synthesized subprocess. The present invention can realize the real-time on-line distinction of the multi-variable system, and has less impact of step test signal required for system distinction on the normal operation of the control system and no special requirement of distinction algorithm in signal amplitude. The method of the present invention is suitable for industrial process control, robot, aeronautics, astronautics and other multi-variable systems.

Disclosed is a method for testing a high-temperature breaking limit of an antiskid brake control box. Three comprehensive testing devices are used for conducting a test, under a high-temperature stepping condition, antiskid brake working currents are applied, whether the performance of the antiskid brake control box is qualified or not is tested, if not qualified, improvement suggestions are put forward so that the high-temperature resistance of the antiskid brake control box can be improved, and if qualified, the test continues until required high-temperature resistance is achieved. A high-temperature stepping test belongs to accelerated life tests, test data of the high-temperature breaking limit are used as one of the bases for formulating the profile of a high-acceleration stress screening test. According to the method for testing the high-temperature breaking limit of the antiskid brake control box, the method with the high-temperature stepping test and the applied working currents integrated is used for stimulating high-temperature fault potential risks of the antiskid brake control box, the improvement suggestions directing at the fault potential risks are put forward and carried out, and the high-temperature breaking limit needed by the accelerated life tests and the high-acceleration stress screening profile is determined.

The invention provides a casting and method for evaluating the hot crack tendency of the high temperature alloy investment casting process. The investment casting adopts a step test model with an extra large variable-section coefficient; the model comprises a cylinder, the bottom of the cylinder is connected with four pairs of thin plates of different thickness, the top center of the cylinder is connected to the bottom of a sprue, and the top of the sprue is connected with a truncated cone-shaped pouring gate. After adopting the casting and method, the hot crack tendency condition of the high temperature alloy investment casting under the conventional casting processing conditions is found out, the improvement of the casting technology is guided, reasonable advice can be supplied for the structural design of the casting, so that the hot-crack forming tendency of the high temperature alloy investment casting is expected to be reduced from the source, and the other existing hot crack evaluation methods cannot be compared with the advantages.

A chromatographic lateral-flow assay system for rapid, high sensitivity method of detecting low levels of ligands in body fluids, with few false positives and few false negatives. The lateral-flow assay may have a membrane strip in ribbon form, which increases detection on the order of 2 to 10 fold over the conventional chromatographic specific binding assay techniques by placing a dried or lyophilized conjugate in colloidal spheres opposite side of the lateral flow membrane strip. A chromatographic specific binding assay strip device, comprising: a laminate strip having a first side and an second side; a conjugate pad or membrane disposed on said first side of said laminate; a hinge region connecting sample receiving pad or membrane strip and reservoir pad or membrane disposed on said second side of said laminate; wherein said laminating material isolates the conjugate pad from the sample pad such as to slow the fluid path into the fibrous sample pad, and a detection pad or membrane strip disposed between the sample pad or membrane and the reservoir pad or membrane on said first side of said laminate. The more complete mixing permitted by this temporary obstruction provides an important feature of the invention that gives this 2-step test its superior performance. The assay system comprises a housing device, such as a test tube or cassettes to facilitate the mixing of a sample solution with the dried or lyophilized conjugate, and kits.

The invention relates to a comprehensive environment stress test method of an anti-sliding brake control box. According to comprehensive environment stress and test data, high-temperature stepping test data, low-temperature stepping test data and vibration stepping test data simultaneously exerted by working currents of the anti-sliding brake control box, a high-acceleration stress sieving test profile is made up, a method for carrying out a high-acceleration stress sieving test of the anti-sliding brake control box with three comprehensive test devices is obtained and the function of fully utilizing test data resources is achieved. With the comprehensive environment stress test method, the anti-sliding brake control box is stimulated to be sensitive to potential stoppage risks of the comprehensive environment. Simulating and correcting potential stoppage risks corresponding to the anti-sliding brake control box can be completed in two days and improvement suggestions are provided. In a testing process, an improvement technology is adopted as a development technology of anti-sliding brake control boxes of the type and the development efficiency is improved.

The invention provides a distributed network performance measuring system and method based on access gateways. The measuring system and method involve testing and collecting the network performance status of an access network through developing and disposing a network performance measuring client in an embedded mode on the access gateways distributed at places; through the Internet, uploading the results of two test types of access gateway nodes distributed at places, i.e. the results of a one-step test and a long-time test to a database server; and further gathering and integrating test data of the gateway nodes through a center control server, and through a webpage form, displaying visualized long-time monitored performance situation change in a form of a distribution map, a line chart and the like through the overall network performance status of a service provider network. The system provided by the invention can accurately acquire and display long-time network performance status in real time.

The invention discloses a unit coordinated control master control system decoupling compensation control method. According to the method, data are acquired by utilizing a unit onsite coal feed rate step test and a steam turbine high pressure regulating valve step test. A boiler master control decoupling compensation transfer function model is established through a genetic identification algorithm. Meanwhile, a boiler master control compensation simplification model is established and coupled in boiler master control by utilizing decoupling compensation model inference so as to overcome the high delay and high inertia properties of a unit boiler master control system. Compared with the conventional cascade control method, main team pressure compensation regulation can be more rapidly performed by the control method without generating fluctuation of a high pressure regulating valve so that safer and more economical and energy-saving operation of the unit can be realized.

The invention discloses an electronic product significant defect rapid excitation method. The method is mainly composed of a temperature stepping test step, a rapid temperature changing test step, a vibration stepping test step and a comprehensive environment test step. According to the invention, the method takes several key environment factors which influence product reliability into consideration. The several key environment factors include low temperature, high temperature, temperature rapid changing, vibration, etc. The method has wide range of environment condition design, allows strengthening of environment conditions, can rapidly excite possible hazards of a product and find product ultimate stress, and strengthen product design.

The invention discloses a multivariable time-delay system identification method based on a step test, and provides the identification method in a frequency domain mainly for a transfer function model having a pure lag step. The method is suitable for most chemical processes ( such as a pressure reduction heating furnace). The multivariable time-delay system identification method based on the step test comprises a system test unit used for stimulating an identified object to obtain input /output data for identifying; a data processing unit for carrying out noise reduction processing and the like on the data obtained through system test to enable the obtained data to be less influenced by noise, and calculating frequency domain response of the system according to the data obtained through processing; and a parameter estimation unit for carrying out linear processing on the pure lag step, then, estimating parameters through a least square method, and finally, optimizing each model parameter through iteration. The advantages of the method are that the method not only can be applied to an ordinary open-loop system, but also can be directly applied to closed-loop identification without increasing model order; identification precision is high; and the method can provide a high-precision model for a controller design engineer to design a controller.

The invention relates to an experimental method for gas flowing characteristics in a nanometer channel, wherein the experiment method can carry out experimental research on gas flowing at a submicro-nano level and has simple operations. The experimental method for nitrogen flowing characteristics in a nanometer channel comprises: measuring the pore size and the pore density, selecting a gas source, connecting each pipeline and each line, sealing a channel beam film by using a clamping device and a rubber ring, carrying out step test, recording and finishing the experimental measurement results, and checking whether the channel beam film is damaged, wherein the obtained data is valid if the channel beam film is not damaged.

The present invention discloses an intelligent evaluation system for the third-step test for driving license, a system based on network transmission information and comprising a service terminal, a test monitoring and managing module and an audio and video monitoring module. The service terminal is responsible for receiving information of other modules in the system and comparing the information with set information. The test monitoring and managing module is used for collecting the monitored information of each item in the driving test of the vehicle and transmitting the information to the service terminal. The audio and video monitoring module comprises a voice recorder, a video camera and a wireless transmission unit. The audio and video monitoring module is arranged at the top of a vehicle instrument panel and the video camera is located in the vehicle. Both the voice recorder and the video camera record what goes on with the driving learner inside the vehicle in real time and transmit the recorded information to the service terminal through a wireless transmission unit to be stored. With the invention, it is possible to effectively monitor the speed of a vehicle in travel and to increase the safety of the third-step test for driving license considerably.

The invention relates to a method for measuring generator voltage adjustment ratio. The method comprises the following steps: grid-connected operation of the generator is set, the set value of an excitation adjuster is kept unchanged and the difference adjustment coefficient of the excitation adjuster is set to be a non-zero value; the power system stabilizer PSS of the generator set in which thegenerator is located is withdrawn from operation, the voltage step test of the generator is performed and the test recording data are obtained; the first generator stator voltage and the first reactive power at any steady state moment before the step and the second generator stator voltage and the second reactive power at any steady state moment after the step are obtained according to the test recording data, and the disturbance voltage-reactive power ratio and the incremental disturbance voltage-reactive power ratio are calculated; the standard coefficient is calculated by using the rated voltage and the rated apparent power of the generator; and the voltage adjustment ratio of the generator is calculated according to the adjustment ratio calculation formula. Onsite measurement of the generator voltage adjustment ratio is realized and a solution for convenient and accurate onsite measurement of the generator voltage adjustment ratio is provided.

In one embodiment, a method includes powering on a testing system, whereby a unit present signal is included in the system, the unit present signal communicating to a management complex unit (MCU) that a unit under test (UUT) has been inserted into a corresponding architecture, the signal being sent through a relay such that it can be sent or connected at a later time. The UUT is installed in the system and a programming protocol is initiated. The system is then powered off, whereby the unit present signal is set to open and the system is subsequently powered on.

When the UUT is plugged in, the MCU does not see it. The system can include a second relay that allows power being fed to the UUT to be broken such that when the UUT is subsequently powered up, the board is reset and not removed from the architecture.

The invention discloses a VSG inertia and damping coefficient measuring method based on nonlinear least square curve fitting, the method analyzes that the system is on the off-line, The time domain unit step response functions of different operating conditions and damping states are analyzed qualitatively. The method of solving inertia and damping coefficients by using dynamic response indexes isqualitatively analyzed. A load rejection test for inertia measurement of synchronous generators is used for reference, and a self-verifiable comprehensive measurement method is obtained by combining power step test. By synthesizing the two experimental methods, the influence of inaccurate synchronous power value on parameter measurement is avoided, which provides a new method for external characteristic measurement of VSG.

The invention discloses a method for measuring the scattering ratio of a metal alloy material based on a digital ray imaging technology detector response curve. The measuring method comprises the steps: firstly, adopting a dosimeter and a digital ray detector to obtain a response characteristic curve of a digital detector on X rays, then respectively under two conditions of wide beam and narrow beam, placing a to-be-measured metal material step test block in an X-ray transillumination field, selecting a series of different tube voltages and exposure quantities, carrying out single-wall vertical transillumination, reading gray values of all steps under the conditions of wide beam and narrow beam from obtained step test block digital images, finding out the exposure quantities corresponding to the gray values by using the digital detector response characteristic curve, and then calculating the corresponding scattering ratio of the metal alloy material under different voltages. The method has the advantages that compared with a traditional measurement method of a radiographic technology based on films, the method is simple, high in efficiency, strong in operability and good in repeatability, and can measure the ray scattering ratio for most of metal alloy materials.