75 results about "Step 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.

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 discloses a PID parameter setting method based on step response characteristic data of a controlled object. The method comprises the following steps: performing a step response test on aself-balancing controlled object to obtain a step response curve; after sampling and calculating according to a sampling period, determining a unit step response sequence of the controlled object; setting a PID parameter optimization interval, an optimization parameter and a fitness function, and randomly generating an initial PID parameter; simulating a PID closed-loop control system set value disturbance test, and according to a control quantity increment formula and a controlled quantity change quantity prediction formula, obtaining a predicted value of the controlled quantity change quantity at each sampling moment in a PID tuning time domain and a deviation value between the set value and the controlled quantity; and calculating fitness functions corresponding to each group of PID parameters, and optimizing the PID parameters according to a genetic algorithm principle to obtain an optimal PID control parameter meeting a fitness criterion. Model identification does not need to becarried out on the controlled object, and the optimal PID control parameter is determined directly based on the step test characteristic data of the controlled object by using the optimization algorithm.

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.

This invention discloses a sialic acid enzyme test reagent for testing sialic acid enzyme activity in vagina secreta outside the body, containing substrate on the carrier named N-acetyl neuraminate and its salt which can be its derivant or thymolphthaleic N-acetyl neuraminate and its salt, 5-Br-4-Cl-3-indolyl-alpha-D-N-acytylneuraminate and its salt. We can diagnose the bacteriogenic vagina deseases quickly and simple by testing sialic acid enzyme to vagina searate with this sialic acid ester reagent which can be used as an independent diagnosis target with good stability, extremely excellent accuracy and simple operation (one step test).

The invention relates to high-voltage multi-point testing equipment and a method with main and auxiliary steps. The method comprises the following steps of: connecting a plurality of groups of objects to be tested with the testing equipment and setting various testing parameters through an input device; when testing is begun, carrying out a main-step high-voltage testing program firstly, i.e. simultaneously outputting high voltage to the plurality of groups of objects to be tested through a high voltage generating device, and detecting whether the plurality of groups of objects to be tested are normal or not in the main-step testing program through a central control unit; if so, judging the plurality of objects to be tested are all good products to finish testing; and if the central control unit judges any one of the plurality of objects to be tested is abnormal, entering an auxiliary-step testing program, i.e. respectively testing each group of objects to be tested, and displaying testing results on a display, therefore, which group of tested objects are defective products can be learnt by virtue of the display results on the display. The invention can reduce the testing time and improve the testing speed and is easy to reject the defective products by operators.

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 method for testing the repeated positioning accuracy of a machine. Four target points with typical features are found in a working area. Then, followed are four steps: Step 1, respectively fixing two dial indicators on X-stroke and Y-stroke guide rails at one target point, so as to measure the precision numerical value of X-axis and Y-axis strokes; Step 2, making fine adjustment of points of the dial indicators in the X and Y rectangular coordinate system, and regulating the indication numerical value; Step 3, randomly finding four different starting points near each target point, and testing the repeated positioning accuracy from each starting point to the target point; and Step 4, repeating the steps 1-3 and testing the other three target points. In this way, bottlenecks that the repeated positioning accuracy cannot be measured after installation of mechanical structures are fixed, and theoretical basis is provided for calculation of electrical parameters of products by means of feedback of measurement results of the repeated positioning accuracy of mechanical structures.

A machine and methods for reassign the execution order of program steps of a multi-step test program is disclosed. In an embodiment a machine for evaluating an error in a software program includes a microprocessor coupled to a memory, wherein the microprocessor is programmed to evaluate the error by (a) providing program steps of the software program, (b) assigning a position number to each program step, (c) performing an evaluation run on the program steps, (d) evaluating a performance of each program step, (e) rearranging the position number of each program step based on the performance of each program step, and (f) repeating steps (c)-(e).

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.

A new online controller tuning method in closed-loop mode improves over the Ziegler-Nichols continuous cycling method. The method is a closed-loop setpoint step experiment PI/PID controller tuning method, which uses a P-controller with a gain K_c0, runs a setpoint experiment, and obtains a plurality of PI/PID-controller settings directly from three data from the setpoint experiment, wherein the three data are overshoot (Δy_p−Δy_∞)/Δy_∞), time to reach overshoot or first peak t_p, and relative steady state output change b=Δy_∞/Δy_s, wherein Δy_s is a setpoint change, Δy_∞ is a steady-state output change after setpoint step test, and Δy_p is a peak output change at time t_p.

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 provides a testing method and a testing device of direct current electronic transformer delay time. The method includes steps of applying a step signal to a primary side of a direct current electronic transformer; sampling a secondary side of the direct current electronic transformer to obtain a step standard source signal and a step test product signal; performing a generalized multi-item curve fitting on the step standard source signal and the step test product signal, and acquiring a standard source fitting curve and a test product fitting curve; taking points corresponding to90% of peak values of the standard source fitting curve and the test product fitting curve as reference points; acquiring a standard source reference point and a test product reference point; performing cubic spline interpolation on a longitudinal coordinate of the test product reference point to obtain a step termination moment of a tested transformer; confirming a sampling point which is closest to the standard source reference point in the step standard source signal, and using a cross coordinate of the sampling point as the standard source step termination moment; using the difference between the step termination moment of the tested transformer and the standard source step termination moment as the delay time of the direct current electronic transformer.

The invention discloses a CT data correction method; the method uses a step test member to obtain detector dosage nature logarithm values under different equivalent steel thicknesses; the method comprises the following steps: using polynomial fitting to fit a real ray integration curve; solving an ideal ray integration curve; carrying out non-linear corrections for the CT data according to the corresponding relation between two said curves. The method can solve CT data non-linear problems caused by pluripoten ray hardening, ray scattering and detector non-linear physics or system reasons, thusrealizing hardening, scattering and detector non-linear data corrections; the invention also discloses a CT data correction step test member having a plurality of equivalent steel thickness layers, wherein the test member density equals to the standard steel.

The invention provides an evaluation standard and a test method and discloses a method for testing the capability of a synchronous generator in adjusting the voltage of a main transformer high-voltage side bus, for solving the problem that there is not a concrete evaluation standard and a test method for evaluating and testing the capability of a conventional synchronous generator in regulating and controlling the voltage of a main transformer high-voltage side bus. The method comprises the following steps: running a detected synchronous generator under a load condition, and adjusting the active power of the synchronous generator to a predetermined value P; performing a voltage step test on the detected synchronous generator, calculating a ratio delta Us/delta Q of a voltage change value delta Us to a reactive power change value delta Q of the main transformer high-voltage side bus of the detected synchronous generator before and after the test; and establishing a relation curve between the predetermined value P and the ratio delta Us/delta Q. The test method brought forward by the invention combines testing with curve fitting and effectively tests the capability of the synchronous generator in regulating and controlling the voltage of the main transformer high-voltage side bus. A test result can be used for quite accurately evaluating the capability of the synchronous generator in regulating and controlling the voltage of the main transformer high-voltage side bus. Therefore, the method has quite high economic benefits and a quite high utility value.

The invention discloses an intelligent website selection method and device. The method comprises the following steps of receiving a website distribution request which comprises class information and target address information; a first level selection process: selecting first level websites matched with the class information in the website distribution request from to-be-selected websites; a second level selection process: judging whether a website which is matched with a target address in the website distribution request and uses a step-by-step test marking address exists or not, if the judging result is positive, taking the website as a target website, and if the judging result is negative, entering a third level selection process; and the third level selection process: determining a target coordinate, in a map, of the target address in the website distribution request, reading a coordinate range, on the map, of the first level websites, and taking a website, the coordinate range of which can cover the target coordinate as the target website. According to the method and device, the processing efficiency and the website selection result accuracy can be improved.