80results about How to "Low implementation requirements" patented technology

The invention discloses a multi-terminal flexible DC power grid line direction pilot protection method. The method comprises steps: DC current and voltage at two ends of a DC reactor are measured and a DC current mutation rate di/dt and a voltage mutation rate du/dt are calculated; when the di/dt or the du/dt is larger than a threshold value K1-set and K2-set, a protection algorithm is started instantly; fault voltage at two sides of a DC reactor at a protection terminal is measured, and corresponding transient components UM_line and UM_bus (UN_line and UN_bus) are extracted; r1=UM_line/UM_bus (r2=UN_line/UN_bus) is calculated, and a fault direction is judged: if r1>1+epsilon (r2>1+epsilon), epsilon is a reliable margin, positive direction fault is judged and a direction signal RM is equal to 1 (RN=1), or otherwise, reverse direction fault is judged, and a direction signal RM is equal to 0 (RN=0); when RM&RN=1, internal fault is judged; and when RM&RN=0, external fault is judged. The method of the invention has the advantages that data synchronization is not needed; a sampling rate is lowly required; the fault resistance withstanding ability is strong; influences from line distributed capacitance do not exist; engineering implementation is facilitated; and the hardware investment cost is reduced.

The invention relates to a refrigeration and freezing device and a drawer assembly thereof. The drawer assembly comprises a barrel body with the front side opened, a drawer capable of being inserted into the barrel body in a front-and-back push-and-pull manner and an electric control lock mechanism. The electric control lock mechanism is configured to be controllably switched to a locking state so as to lock the drawer to the barrel body or switched to an unlocking state so as to relieve locking on the drawer when the drawer is completely pushed into the barrel body. The electric control lock mechanism is provided with an unlocking button protruding and extending downwards, and the unlocking button is configured to be capable of enabling the electric control lock mechanism to be switched to the unlocking state from the locking state when pressed upwards. According to the refrigeration and freezing device and the drawer assembly thereof, the drawer and the barrel body can achieve automatic locking and unlocking, user operation is facilitated, and the drawer can still be unlocked when the electric control lock mechanism is powered off or breaks down.

The invention discloses a permanent magnet synchronous motor position sensorless control method, comprising a rotating speed stabilization ring for correcting voltage synthesizing vector speed and a voltage amplitude correction ring for realizing vector control. The permanent magnet synchronous motor position sensorless control method essentially solves the problem that the motor is easy to lose synchronization and collapse, brings forwards a novel control strategy algorithm for realizing vector control, and realizes the stable, reliable and efficient operation of the driving system of the permanent magnet synchronous motor.

The invention relates to a drawer module and a refrigerating and freezing device with the drawer module. The drawer module comprises a cylinder and a controlled atmosphere membrane module, wherein drawer space is limited in the cylinder; an accommodating cavity is limited in the top wall of the cylinder, and is communicated with the drawer space; the controlled atmosphere membrane module is mounted in the accommodating cavity, and has a controlled atmosphere membrane and an oxygen-enriched gas collecting cavity; and the controlled atmosphere membrane module is configured to enable more oxygen in the accommodating cavity to enter the oxygen-enriched gas collecting cavity through the controlled atmosphere membrane compared with nitrogen in the accommodating cavity. The drawer module can form rich nitrogen and lean oxygen in the drawer space to facilitate a gas atmosphere for food preservation, reduces the aerobic respiration strength of fruits and vegetables, and meanwhile, guarantees basic breathing effect to prevent anaerobic respiration of the fruits and the vegetables so as to achieve the purpose of long-time preservation of the fruits and the vegetables. The drawer module occupies no storage space, and can prevent collision from damaging the controlled atmosphere membrane module.

The invention provides a refrigerator and a drawer assembly thereof. The drawer assembly for the refrigerator comprises a box provided with a forward opening, a drawer arranged in the box in a front-back push-pull manner and provided with a front end plate used for sealing the forward opening, and a transmission cable assembly. The transmission cable assembly comprises a wiring rod and a spiral spring cable, wherein the front end of the wiring rod is fixedly connected to the rear surface of the front end plate and arranged in the front-back direction, the spiral spring cable is arranged on the wiring rod in a sleeving manner, the end portion of the spiral spring cable is fixedly connected to the front end plate so that electric power or signals can be transmitted to a power utilization component on the front end plate, and the spiral spring cable is arranged to be subjected to elastic and telescopic deformation along with front-back movement of the front end plate.

The invention discloses a heart rate calculating method based on heart sound signal autocorrelation analysis. The method comprises the following steps: first, acquiring heart sound signals by utilizing a recording device; then, carrying out extracting on the heart sound signals, and carrying out dead zone nonlinear treatment, thus obtaining the signals to be analyzed and processed; carrying out autocorrelation operation on the signals obtained after extraction, thus obtaining an autocorrelation sequence; and then, carrying out dead zone nonlinear treatment on the autocorrelation sequence, extracting the position of the second period from the sequence obtained after processing, and calculating the period of the heart sound signals according to the peak of the second period, thus obtaining the heart rate. According to the heart rate calculating method, the autocorrelation sequence is obtained through autocorrelation treatment and dead zone nonlinear treatment, the heart rate is calculated from the autocorrelation sequence, the calculation for the heart rate can be accurately realized by adopting the heart sound signals, the calculation method is simple, the result is accurate, the requirements for hardware implementation are low, and the realization in wearable devices is very convenient.

The invention relates to a gas suction pump assembly and a cold storage and freezing device. The gas suction pump assembly comprises an installing box and a gas suction pump; a containing space is defined in the installing box; at least part of the box wall of the installing box is made from a micro-porous silencing plate; the surface of the micro-porous silencing plate is provided with a plurality of silencing through holes; the gas suction pump is arranged in the installing box; and the micro-porous silencing plate is arranged to absorb noise generated by the gas suction pump when the gas suction pump runs. By means of the micro-porous silencing plate, the gas suction pump assembly reduces outward spreading of the noise when the gas suction pump runs.

The invention relates to a refrigeration and freezing device and a drawer assembly of the refrigeration and freezing device. The drawer assembly comprises a barrel body with the opened front side, a drawer capable of being inserted into the barrel body in a front-back pushed-pulled mode, and an electric control lock mechanism. The electric control lock mechanism comprises a clamping ring, an electric control lock and an emergency unlocking rod. The clamping ring is arranged on the rear wall of the outer side of the drawer. When the drawer is completely pushed into the barrel body, the clamping ring stretches out of the barrel body through a through hole in the rear wall of the barrel body. The electric control lock is configured to be controlled to enable a lock pin of the electric control lock to horizontally move back and forth in the transverse direction so as to be inserted into or disengaged from the clamping ring, and therefore the drawer is locked to or unlocked from the barrel body. The lock pin is provided with a first inclined face which is gradually inclined in the direction away from the clamping ring from bottom to top. The emergency unlocking rod is arranged above the lock pin in a vertical extending mode. The lower end of the emergency unlocking rod is provided with a second inclined face parallel to the first inclined face. According to the configuration, when the lock pin is inserted into the clamping ring, in the moving-down process of the emergency unlocking rod, the lock pin is pushed through cooperation of the second inclined face and the first inclined face to be disengaged from the clamping ring. Automatic locking and unlocking can be achieved for the drawer and the barrel body, convenience is brought to users for operation, and the drawer can still be unlocked when the electric control lock mechanism loses efficacy.

The invention discloses a matched filtering method in which a square wave is used as a swash response of a matched filter, and various filtering coefficients are fixed values. In the invention, the square wave is used as the swash response of the matched filter, and the filtering coefficients are fixed values, thus floating point multiplication required when the traditional matched filter selects an image of a selective forming filter can be avoided, and summation and accumulation of various items are just needed, thereby decreasing achievement difficulty of hardware; the length of the swash response of the matched filter is designed to be a sign period, if the multiple of the sampling is N, order of the filter is N or N+1 which is far smaller than the NK (K is the lasting sign period number of the swash response of the forming filter) of the traditional matched filter, thereby further reducing the achievement requirement of the hardness; and R paths are selected to carry out parallel treatment, so that the work rate of the matched filter is 1/R less than the transmission rate of data, thereby further meeting the transmission requirement of a high-speed data system.

The invention relates to an air extracting pump assembly and a refrigerating and freezing device. The air extracting pump assembly comprises a sealing box where a sealing space is defined, and an air extracting pump arranged in the sealing box. The sealing box comprises a lower box body with the upper side opened, and an upper box body with the lower side opened. A sealing cover of the sealing box is buckled on the upper side of the lower box body so that the sealing space of the sealing box can be defined by the sealing cover and the lower box body together. The rear end of the upper box body is hinged to the rear end of the lower box body. The front end of the upper box body is fastened at the front end of the lower box body in a thread connection manner. By means of the air extracting pump assembly, outward propagation of the noise of the air extracting pump can be reduced, and the air extracting pump is convenient to disassemble and assemble.

The invention provides a linear classification algorithm for true and false coughs of patients with cervical spinal cord injury. The algorithm is characterized by comprising the following steps: acquiring a plurality of unvoiced sound samples and voiced sound samples, intercepting initial segment sequences of the unvoiced sound samples and voiced sound samples, and filtering the initial segmentsequences; calculating a zero-crossing rate and a maximum autocorrelation coefficient of the obtained sequences; establishing a linear classifier by taking the zero-crossing rate and the maximum autocorrelation coefficient as characteristics, and training a linear classifier by taking the unvoiced sound samples and the voiced sound samples as a sample set; and identifying the true cough and the shouting type pseudocough of a patient with the cervical spinal cord injury through the trained linear classifier. According to the algorithm, the difficulty that a recognition model cannot be trained due to insufficient cough sound training samples of patients with cervical spinal cord injury is eliminated; the true and false coughs can be recognized only by utilizing unvoiced sound and voiced sound signals, and the interference of the false cough of a shouting sound type on the analysis of the cough intensity is eliminated; meanwhile, the method is simple in model, small in calculation amountand convenient to implement in wearable equipment.

The invention provides a cold storage refrigerating device which comprises a cabinet body, an air adjusting film assembly and an air extractor. A first storage space is defined in the cabinet body. A storage container is arranged in the first storage space. The storage container is provided with a cylinder body and an air adjusting preserving space located in the cylinder body. The air adjusting film assembly is installed on the cylinder body, and space around the air adjusting film assembly communicates with the air adjusting preserving space. The air adjusting film assembly is provided with at least one air adjusting film and an oxygen enrichment gas collecting cavity and arranged to enable more oxygen in air flow in the space around the air adjusting film assembly to penetrate the air adjusting films relative to nitrogen in air flow in the space around the air adjusting film assembly to enter the oxygen enrichment gas collecting cavity. The air extractor communicates with the oxygen enrichment gas collecting cavity through a pipeline to extract and pump the gas penetrating into the oxygen enrichment gas collecting cavity out of the storage container. The cold storage refrigerating device is good in preserving effect, moreover, the requirements for rigidity and strength of the cabinet body and the like are low, the achievement requirement is low, and the cost is low. Moreover, the size is small, the noise is low, and cold storage refrigerating device is particularly applicable to families and individuals.

The invention discloses an object density acquisition method and device and belongs to the image analysis technology field. The method comprises steps that n monitoring images of a target area collected at n different times in the target time period are acquired, and the n is an integer greater than 1; objects contained by each monitoring image are identified; the distance difference information corresponding to each monitoring image is acquired, and the distance difference information is used for indicating the degree of difference in the distances among the objects contained in the monitoring images; according to the respective distance difference information of the n monitoring images, the object density of the target area in the target time period is determined. The method is advantaged in that constructing and training a model are not needed in the scheme realization process, and scheme realization complexity and enforcement requirements are reduced.

The invention discloses a method and device for displaying position marks, equipment and a storage medium, and relates to the technical field of computers. The method comprises the following steps: displaying a thumbnail map; controlling a first virtual object to attack a second virtual object, wherein the first virtual object belongs to the first camp, the second virtual object belongs to the second camp, and the relation between the second camp and the first camp is an adversarial relation; and in response to the condition that the first virtual object beats the second virtual object, displaying a position mark of a third virtual object in the thumbnail map, the third virtual object belonging to the second camp. In this way, the process of displaying the position marks of the virtual objects belonging to the confrontation camp in the thumbnail map does not depend on reconnaissance props, the implementation requirement for displaying the position marks of the virtual objects belonging to the confrontation camp in the thumbnail map is low, and the display frequency is not limited by the number of usable times of the reconnaissance props; the flexibility and reliability of displaying the position marks are improved, and then the man-machine interaction rate is increased.

A method for dynamically allocating wavelengths based on a PON system comprises the following steps of: S1, a G/EPON system local side device OLT and a terminal device ONU perform an initialized dynamic discovery process through a standard IEEE802.3OAM or ITU-T OMCC channel; S2, when the local side device OLT detects specific ONU device, negotiation of a wavelength channel is carried out through an extended dynamic communication wavelength protocol EDWP based on MPCP or PLOAM, and idle wavelengths which are not used yet are selected as exclusive wavelengths of the ONU device; S3, the local side device OLT is responsible for maintaining and recycling idle wave bands; and S4, the local side device OLT and the terminal device ONU perform subsequent registration authentication interaction andservice flow in the new wavelength channel. According to the invention, partial functions of the WDM-PON are realized, and the realization difficulty and requirements of the ONU laser are reduced; thebandwidth of the current G/EPON system can be directly improved from the current 2.5/1/25G throughput sharing mode to 2.5/1/25G exclusive use of single-terminal ONU device; and the method is completely compatible with the original G/EPONONU, and the G/EPONONU and the EPONONU share bandwidths and do not influence each other.