The invention discloses a resistance device based on magneto-rheological cement and a magnetic control rheostat. The resistance device based on the magneto-rheological cement comprises an insulating sleeve, electrodes, magneto-rheological cement and wiring ends, wherein the magneto-rheological cement is fixed inside the insulating sleeve; the electrodes are distributed on the upper inner surface and the lower inner surface of the insulating sleeve, and are in sufficient contact with the magneto-rheological cement; and the wiring ends are welded on the two electrodes. The magnetic control rheostat comprises excitation coils, an upper magnetic pole, a lower magnetic pole and the resistance device based on the magneto-rheological cement, wherein the resistance device based on the magneto-rheological cement is fixed between the upper magnetic pole and the lower magnetic pole; the excitation coils are coiled between the upper magnetic pole and the lower magnetic pole; the excitation coils, the upper magnetic pole, the lower magnetic pole and the resistance device based on the magneto-rheological cement commonly form a closed bidirectional magnetic loop; and the intensity of a magnetic field of the closed magnetic loop is adjusted by controlling the magnitude of the current of the excitation coil, so that the resistance of the resistance device based on the magneto-rheological cement can be changed. The invention designs the rheostat for controlling the resistance value of the device by a magnetic field generated by the current through using the characteristic that the conduction property of the magneto-rheological cement can be enhanced by additionally arranging the magneto-rheological cement with the increase of magnetic fields. The magnetic control rheostat is applicable to an electronic control system or a computer control system.

Resistance device based on magneto-rheological cement and magnetic control rheostat

The invention discloses a pressure sensor based on magnetorheological materials. The pressure sensor comprises an outer shell which is fixedly connected with a base, and a magnetorheological elastic body arranged in a concave cavity of the base. An upper electrode plate and a lower electrode plate are attached to the upper end face and the lower end face of the magnetorheological elastic body respectively. An insulation thin film is fixedly arranged between the cavity bottom of the concave cavity of the base and the lower electrode plate in an attaching mode, and the upper electrode plate and the lower electrode plate are connected with a signal adjusting module placed outside the outer shell through lead wires. A pressure head is placed in a cavity of the outer shell, and the upper end of the pressure head extends out from a via hole formed in the upper end of the outer shell and is in clearance fit with the via hole. The lower end of the pressure head is arranged in the concave cavity of the base in a clearance fit mode and is in contact with the upper electrode plate. The pressure head is sleeved with a supporting spring used for supporting the pressure head, the lower end of the supporting spring abuts against the upper end face of the concave cavity of the base, and the upper end of the supporting spring abuts against the lower end face of a positioning boss arranged on the pressure head. The pressure sensor based on the magnetorheological materials is quick in reaction, capable of measuring dynamic values and static values, easy to maintain and good in stability.

Pressure sensor based on magnetorheological materials

A fruit and vegetable picking device comprises a first cover body, a coil, a magnetofluid ball and a second cover body. One end of the first cover body is an opening end, and a spherical groove is arranged at the opening end. The coil is spherically distributed in a ring, at least a part of the coil is contained in the spherical groove, and the coil is electrically connected with an external power source. The magnetofluid ball comprises a flexible ball casing and magnetorheological fluid contained inside the flexible ball casing, and a part of the magnetofluid ball is contained in the coil. The second cover body is in a shape of a circular truncated cylinder, the second cover body comprises a big opening end and a small opening end, the second cover body is covered on the magnetofluid ball, the big opening end is fixedly connected with the opening end of the first cover body, one end of the magnetofluid ball protrudes out of the small opening end to form a holding portion which is used for wrapping fruits and vegetables. After the magnetorheological fluid changes into solid, surfaces of the fruits and vegetables are completely contacted with the holding portion, the holding portion can stably hold the fruits and vegetables, dropping of the fruits and vegetables from the inside of the holding portion is prevented, and damage can be avoided.

Fruit and vegetable picking device

The invention discloses a first-order buoyancy magnetic liquid damping vibration absorber for magnetic shielding, and belongs to the field of mechanical engineering vibration. The problem that existing magnetic liquid damping vibration absorbers cannot be applied in engineering practice due to various structural problems is successfully solved. The first-order buoyancy magnetic liquid damping vibration absorber comprises a shell (1), an upper shielding cover (2), an upper permanent magnet (3), a mass block (4), a lower permanent magnet (5), a lower shielding cove (6) and magnetic liquid (7). When external vibration is produced, the mass block (4) moves in the upper shielding cover and the lower shielding cover, the magnetic liquid (7) flows in the gap between the upper and lower permanent magnets and the mass block (4), and therefore energy is absorbed to achieve the vibration absorption purpose; and a frequency difference is formed between the mass block (4) and the shell (1) due to first-order buoyancy formed by the upper permanent magnet (3) and the lower permanent magnet (5) inside the magnetic liquid (7), and the vibration absorption efficiency reaches the maximum.

First-order buoyancy magnetic liquid damping vibration absorber for magnetic shielding

The utility model discloses a connecting rod-type displacement monitor, comprising at least one standard connecting rod. Each standard connecting rod comprises a bottom connection line, a bottom connection part, a steel pipe, a movable shaft, a top connection part and a top connection line. The bottom connection part is positioned at the bottom of the steel pipe. The movable shaft is positioned at the top of the steel pipe. The other end of the movable shaft is connected with the top connection part. The bottom connection line extends out of a lower part of the bottom connection part. The top connection line extends out of an upper part of the top connection part. The bottom connection line and the top connection line are connected through a connection line arranged in the steel pipe. The steel pipe is also internally provided with a sensor assembly. The top connection line can be connected with a signal receiver or a bottom connection line of another standard connecting rod. The bottom connection line can be connected with the signal receiver or a top connection line of another standard connecting rod. The connecting rod-type displacement monitor obtains the horizontal displacement of a structure body using angle measurement, and is simple in structure, convenient and practical. The connecting rod-type displacement monitor also can be used for monitoring vertical displacement in settlement deformation, and has a wide application range.

Connecting rod type displacement monitor

The utility model relates to a magnetorheological fluid electromagnetic characteristic testing device which includes a magnetorheological fluid electromagnetic characteristic converter, a signal preprocessing part, a signal amplifying and filtering part, a data processing part, and a display part. The magnetorheological fluid electromagnetic characteristic converter includes a magnetorheological fluid resistance converter which is composed of a magnetorheological fluid resistor and a resistance-voltage converting circuit, a magnetorheological fluid capacitance converter which is composed of a magnetorheological fluid capacitor and a capacitance-voltage converting circuit, and a magnetorheological fluid inductance converter which is composed of a magnetorheological fluid inductor and a inductance-voltage converting circuit. The magnetorheological fluid resistor and the magnetorheological fluid capacitor take two metal flats as the electrodes, and use an insulating material to package the two electrodes into an enclosed device. The inside of the enclosed device is provided with a magnetorheological fluid. The magnetorheological fluid inductor is an I-shaped inductor, and an I-shaped skeleton is made of the insulating material. The inside of the magnetorheological fluid inductor is filled with the magnetorheological fluid. The skeleton is compactly twisted with a copper coil. The magnetorheological fluid electromagnetic characteristic testing device can display the magnetorheological fluid electromagnetic characteristic parameters and the changing rule in an outer magnetic field real-timely and effectively.

Magnetorheological fluid electromagnetic characteristic testing device

The invention provides a measurement method for a magnetostrictive effect based on magnetorhrologic grease and designs an optical lever sub-nanometer precision micro-displacement measuring device for a dependent variable of the magnetorhrologic grease magnetostrictive effect for solving the problems that no enough attention is paid to the magnetostrictive effect based on the magnetorhrologic grease and a traditional optical lever method is low in measurement precision and the like. The optical lever sub-nanometer precision micrometric displacement measuring device disclosed by the invention consists of a magnetorhrologic grease magnetostrictive effect micro-displacement actuator and an optical lever micro-displacement measuring device based on the magnetorhrologic grease magnetostrictive effect variable. The magnetorhrologic grease magnetostrictive effect micro-displacement actuator acts on an optical lever in a line contact manner; when the magnetorhrologic grease is magnetized, a magnetostrictive effect variable is generated. The magnetostrictive effect variable is subjected to first-stage amplification through the optical lever and then is subjected to second-stage amplification through a lens group, is received and converted into an electrical signal by a PSD (Phase-Sensitive Detector), and finally the dependent variable is obtained. The research on the magnetorhrologic grease magnetostrictive effect is a new trial for research on magnetorheologieal fluid and has an important practical valve for the research on the magnetorheologieal fluid.

Optical lever measurement method for magnetostrictive effect based on magnetorhrologic grease and measuring device for optical lever measurement method

The utility model provides an intellectual detection system for magnetostrictive effect, solving the problems that the magnetostrictive effect based on magneto-rheological grease is not brought to the forefront and the measurement accuracy for the existing optical lever method is low. The intellectual detection system for magnetostrictive effect comprises a magneto-rheological grease magnetostrictive micro-displacement driver and an optical lever micro-displacement measuring device which is based on the dependent variable of the magneto-rheological grease magnetostriction, wherein the magneto-rheological grease magnetostrictive micro-displacement driver acts on the optical lever in a line contact mode; when the magneto-rheological grease is magnetized, the dependent variable of the magneto-rheological grease magnetostriction is generated; a first level amplification is performed for the dependent variable through the optical lever, and the second level amplification is performed through a battery of lens so as to make the dependent variable be received by PSD; and the dependent variable is convert to an electrical signal by the PSD; and the electrical signal is input to a data processing system for data processing through a pre-amplify circuit and an A/D conversion, thus obtaining the magnitude of the dependent variable. The intellectual detection system for magnetostrictive effect has the advantages of being able to accurately measure the magnitude of the dependent variable of the magneto-rheological grease magnetostriction under the effect of various magnetic fields, having simple structure, convenient operation, accurate measurement, high accuracy and high anti-external-interference, and being able to realize real time measurement. Studying on the magneto-rheological grease magnetostrictive effect is a new try for studying the magneto-rheological fluids and has very important practical value for studying the magneto-rheological fluids.

Intellectual detection system for magnetostrictive effect

The utility model relates to a magnetorheological fluid intelligent sensing technology and a magnetorheological fluid acceleration intelligent sensing system, and designs a magnetorheological fluid acceleration intelligent sensing system. The utility model is characterized in that: putting a nonmagnetic mass block into a nonmagnetic container filled with magnetorheological fluid; fixing the mass block in the container by using a spring, wherein relative displacement exists between the mass block and the container due to the effect of damping force of elastic force of the spring and the magnetorheological fluid when the container has acceleration; calculating the acceleration of the container by detecting change of the relative displacement; and increasing measurement range of the acceleration by adjusting external magnetic field as the damping factors of the magnetorheological fluid change with the changing external magnetic field. The magnetorheological fluid acceleration intelligent sensing system provided by the utility model has the advantages of high anti external interference capability, high precision, wide measurement range and the like.

Magnetorheological fluid acceleration intelligent sensing system

The invention relates to designing of a sensing method and a sensor device for a small inclination angle of magnetorheological fluid. According to the invention, the magnetorheological fluid is put into a nonmagnetic container, and the volume of the magnetorheological fluid is half the volume of the nonmagnetic container; a detection capacitor is disposed at an upper end and a lower end of the nonmagnetic container; when the nonmagnetic container deflects an angle along a reference direction, the proportion of a medium (an air part and a magnetorheological fluid part) in the detection capacitor is changed, and thus, detection capacitance changes; and an inclination angle can be calculated based on a detection capacitance value. Since the dielectric constant of the magnetorheological fluid varies with changes of an outer magnetic field, approximate linear relation between the detection capacitance and the inclination angle can be achieved by adjusting the magnetic field, and sensitivity of the sensor can be improved by changing the value of the detection capacitance.

Sensing method and apparatus for small inclination angle

Popular Tasks used by Researchers

How can I help with your research?

Get more enhanced response by uploading the PDFs you want me to reference.

No relevant PDFs in your library

SciSpace is the AI research assistant for academics. Run systematic literature reviews on 280M+ papers, and write papers with cited sources. Trusted by 1M+ students, PhDs & researchers.

SciSpace | AI for Research

We encountered an error while loading the panel. Please try refreshing the page.

Something went wrong

Analyze PDFs

Code & Manuscripts

Funding & Grants

Literature & Patents

Medical & Clinical Data

Systematic Review

Visualize & Present

Web & Data

Build a Google Scholar-like website for your research.

Build a website

Create charts and images for your research

Create a Chart

Write a paper for submission to a journal

Draft a manuscript

Patent Search

Design eye-catching scientific posters in minutes.

Scientific Poster Generation

Systematic Literature Review

Anyone with the link can view this chat. You can switch it back to private anytime.

One task is running at the moment. Your messages will be shown right after.

Drag and drop or click here to browse

Loved by <highlight>1 million+</highlight> researchers

Extract a list of specific topics and their sources from unstructured text

Topics

Compare and analyze relevant papers that matches with your search

Papers

Get insights from PDFs and bookmarked papers from your library

My library

Recent searches

Try searching for:

Catch AI-generated content in scholarly and non-scholarly content

{ai} Detector

Ai Writer

Get PDF Summaries, highlighted text explanations 

Chat with PDF

Effortlessly create in-text citations and bibliographies in APA and 2,500 other formats

Citation generator

Get explanations, summaries, and answers on academic papers

Ease up your research workflow with {scispace}'s cohort of exciting AI tools

Elevate your academic writing skills and convey your ideas the way you want

Paraphraser

Explore our range of reading and writing tools

Your file is being prepared and should be ready in a few minutes. If it's a large file, it might take a bit longer. You can close this window, and we'll email you the file when it's done.

You have reached a maximum limit of <strong>{limit}</strong> columns in the table. Remove at least <strong>1</strong> column to add or create another one.

Mingxin Gu

Author Tools

Chat about Author