Experience of visiting the laboratory

Experience is what each of us thinks and feels in life or study. Writing down these experiences can help us understand things better. The following is my "experience of visiting the laboratory" for your reference only. Welcome to reading.

Experience of visiting the laboratory (1) Through this experiment, I opened my eyes. It is precisely because this experiment is characterized by vibration measurement and spectrum analysis of slewing mechanism and the first-order natural frequency and damping coefficient test of cantilever beam that it needs to be programmed with software and displayed by computer. It can be said to be semi-automated. Therefore, in the course of the experiment, I learned a lot: it made me deeply understand the preparation of theoretical knowledge before the experiment, that is, to know the relevant materials of the experiment in advance, such as experimental requirements, experimental data, experimental steps, and most importantly, what data to record, how to do data processing, and so on. Although the instructor will explain the experimental steps and how to record the data when doing the experiment, it is difficult to do it if you don't have some basic knowledge. You can only do what the teacher says, but you don't know what to do.

In this experiment, I learned a lot, strengthened my practical potential and cultivated my independent thinking potential. Personality is when making an experimental report, because there are many problems in data processing, it is difficult to continue without solving them. For example, when processing data, it is necessary to collect data, which requires understanding some basic operations of labview software; When drawing, you should also use software to draw pictures, which also requires you to know the command of inserting charts in excel software. And when doing vibration measurement and spectrum analysis experiments of rotary mechanism and obtaining data, pay attention to changing sampling frequency when reading waveform, and so on. Of course, I have not only learned this, so I won't say much here.

There is also hands-on experiment, which combines some theoretical knowledge of testing technology course with practice, which deepens my understanding of testing technology course and consolidates my theoretical knowledge.

However, although this experiment is good, I think the arrangement is not good, and there is still time for the test technology exam. It is precisely because these schedules conflict with our curriculum design time that I can't concentrate on any one, and as a result, the quality of each project can't be guaranteed. Please point out any mistakes!

Experience of visiting the laboratory (2) After the professional introduction course in the first semester, we got a preliminary understanding of the major of ship and ocean engineering, so in this semester, we got rid of slides, pictures and words and saw the real laboratory, which is how ships were built. Every Thursday at two o'clock in the afternoon, dragging the body that is not fully awake, we wander around various laboratories and listen to the teacher's explanation, the story of each laboratory and the role of each laboratory. This is the professional introduction of last semester. In my opinion, it should be a practice. We know more about our major. Although I still don't understand many technical terms said by the teacher, I still feel that I have more understanding of this major after listening carefully, but it is said that professional introduction is a continuation and practice.

A few weeks ago, we listened to the teacher introduce some knowledge about ship performance in the performance laboratory. We visited a large model towing pool and a large depth control pool. At that time, we also saw seniors and sisters doing experiments. It is estimated that he will come to us in a year or two. Although these laboratories look a little old now, and although we only see some steel and water tanks, more precisely, we see some rusty steel and water tanks, which feel dirty inside, the things in these laboratories are very advanced laboratory equipment in China. A large model towing tank for fleet test: 1, which is unique in China. 2. Large depth control pool: the pool with the most manual control in Asia; 3. The shipbuilding technology and equipment laboratory has the domestic advanced level, and its experimental equipment of "cold bending robot for ribs" is the international leading level; 4. The large-scale structural test platform and complete static and dynamic loading analysis system are the first in domestic universities; 5. High-level research platforms such as circulating water tank, wind tunnel, 24-unit wave generator, computer workstation and related software. These laboratories all study hull performance and ship performance, which broadly refers to the sum of all kinds of ship performance; In a narrow sense, it refers to the generalization of static performance and dynamic performance of ships. The narrow sense of ship performance is closely related to the main size, shape and load of the ship. In theoretical research, the buoyancy, stability and sinking resistance of ships under different conditions are studied on the basis of hydrostatics, and the rapidity, seaworthiness and maneuverability of ships are studied on the basis of fluid dynamics, which are the most basic properties of ships. After listening to it, I really think that the boat is also a very magical thing. In such a storm, it can actually carry so many items to sail. Besides, those warships are more powerful. Such a large volume can also have such a fast speed. I can't help but respect the shipbuilders and overcome so many obstacles to build such a powerful ship. Next, we visited the laboratory about the ship structure, which determines the performance, so the ship structure can be said to be equivalent to the human body, the skin is equivalent to the hull, and the bones are equivalent to the hull skeleton, etc. These are all very important. Through the teacher's talk, we initially learned that the general ship is composed of hull, hull skeleton, deck, cabin and superstructure. Hull, also known as hull plate, is the hull of a ship, including side plates and bottom plates. The geometric shape of the hull is determined by the shape of the hull plate. Various external forces, such as longitudinal bending force, water pressure and wave impact force, first act on the hull plate. The hull skeleton consists of keel, side keel, ribs, keel, stern keel, stern column and stern column, which together form the ship skeleton. Deck is a plane structure above the inner bottom plate, which is used to cover the internal space of the ship and stratify it horizontally. Deck is the steel plate on the ship beam, which divides the hull into three layers: upper, middle and lower. Deck plays an important role in ensuring the strength and unsinkability of the hull, and provides an area for arranging various cabins and placing weapons and mechanical equipment. The number of decks depends on the size of the ship, its type, mission and main dimensions. Small ships usually have 1 ~ 3 floors; Medium-sized ships have 3 to 5 floors; Floor 5 ~ 10 of the ship. Cabin refers to the space with various uses below the nail plate, including the forecastle, the stern cabin, the passenger cabin, the cargo cabin, the engine room, the boiler room and various special-purpose cabins. Superstructure refers to the building above the main deck, surrounded by the upper deck, and is mainly used to arrange cabins for various purposes, such as working cabin, living cabin, storage cabin, instrument and equipment cabin, etc. Ship tools for the crew to work, live and store. The superstructure includes the first floor, the bridge building, the tail building, the deck room and various fence buildings. Of course, I searched most of the above online. Although the teacher gave us an introduction, it was not so detailed.

Then there is the marine engineering laboratory that impressed me the most. The teacher in the marine engineering laboratory is very responsible for introducing what equipment is on board and what functions it has. Although we are marine engineering and ocean engineering, not marine engineering, we should pay more attention to ship structure, but it is still very interesting. The main systems of marine engine comprehensive laboratory include: main propulsion system, ship pipeline system, ship power station system, engine room automation system and diesel engine digital monitoring and diagnosis system. Among them, the ship pipeline system is understood in detail, including engine room fuel system, engine room lubricating oil system, main seawater and fresh water pipeline system, compressed air system, engine room bilge water, ballast water and fire water system. First, we introduced the engine room fuel system. Generally, there is diesel oil and fuel oil on board, and of course there is lubricating oil. The teacher raised a question here, why not use diesel instead of gasoline? Gasoline should be ignited, and diesel is compression ignition, so diesel is selected for safety reasons. Less energy is consumed when offshore, and more energy is consumed when docking, because various systems need to be called when docking, and not so much when offshore, so more energy is consumed when docking. In addition, we know there is a difference between heavy oil and light oil. Heavy oil needs to be heated when it passes through the pipeline, so that it can swim smoothly in the pipeline, otherwise it will solidify in the pipeline. Therefore, heavy oil is generally used when offshore, and light oil is generally used when berthing, in order to protect the machine. If heavy oil is used, solidification in the pipeline will bring great trouble to the next startup. Next, the main seawater and fresh water systems are introduced, which are mainly used to cool the machine. Why is it still divided into seawater and fresh water? It turns out that seawater is high in salt content and easy to corrode machines, so it is necessary to desalinate seawater first. First, we thought of salt water separation, but the teacher said the salt was still too high. Finally, he told us that in general, salt water is converted into fresh water by distillation. The original purpose of cooling is to take away energy, but the diesel engine mainly provides energy for the system by obtaining high temperature. If all the energy is taken away, it is not economical, so use high-temperature fresh water to cool the machine. After the high-temperature fresh water is used up, the salt water will cool it down, and then it will be recycled to achieve the purpose of cooling down. After the introduction of oil-water system, we see that compressed air system, compressed air system, as its name implies, is the heat generated by air compressor for other components to use.

Finally, let's have a brief understanding of the types of ships, which are usually classified according to their uses: ordinary transport ships, passenger ships, groceries, bulk cargoes and so on. Special transport ships: container ships, timber ships, ro-ro ships, refrigerated ships, oil tankers, liquefied natural gas ships, etc. Multi-purpose marine mineral powder, mineral oil, etc. Special purpose ship scientific research, icebreaking, rescue, etc. Of course, we are most interested in luxury cruise ships. Super luxury cruise ships usually refer to super cruise ships with a displacement of more than100000 tons. By the end of 2065,438+00, there were more than 65,438+05 super cruise ships, the largest of which was Royal Caribbean Cruises, which made its maiden voyage in February 2065,438+00. The cruise ship is about 360 meters long, 47 meters wide and 65 meters high above the waterline. It has 16 deck and 2700 cabins, which can carry 6360 passengers and 2 160 crew. With a displacement of 225,000 tons, it is known as an "active city". I really yearn for such a super luxury cruise ship!

I benefited a lot from this cognitive experiment. From the past to the present, any scientific research is verified by experiments. It can also be said that experiment is the only criterion for testing theory. As a college student, I must not tolerate studying books, but only theoretical analysis and lack of practice. I believe that as long as we are willing to use our brains, supplemented by diligence and persistence, we will be able to continuously improve our practical ability and innovate for China's shipbuilding industry.

Experience of visiting the laboratory (3) The laboratory in colleges and universities is an important base for cultivating high-level talents and conducting scientific research. In western developed countries, schools attach great importance to cultivating students' practical ability, and this issue has been paid more and more attention by educators in China in recent years. In order to improve students' practical ability, let students do relevant training and complete the experiment report of single chip microcomputer, and pay attention to cultivating students' experimental skills and practical ability in the form of experiments. Middle school students can sum up a lot of experience from the experience of single chip microcomputer experiment to adapt to the development of contemporary society.

To learn the course of single-chip microcomputer (mcs-5 1 of inter company is selected for teaching), we should master the meanings of various basic statements in assembly language in the instruction system of single-chip microcomputer, the basic knowledge and methods of assembly language programming, and the interface technologies such as input and output interruption of single-chip microcomputer connecting with other equipment. Make students integrate theory with practice from the combination of hardware and software, improve their hands-on ability, and thus fully master the application of single chip microcomputer.

The whole process of experimental teaching includes three stages: cognition, foundation and synthesis. In the past, the experiments of single chip microcomputer were all compiling and debugging software, which was out of touch with the hardware circuit in practical application. Students lack the ability of hardware design, debugging and analysis, and lack understanding of how to form a minimum application system of single chip microcomputer. Single-chip microcomputer experimental board, through computer connection simulator, combines hardware and software to debug,

It is also convenient to modify the software. After debugging the software and hardware, the program is solidified in eprom and inserted into 805 1 single chip microcomputer to form a complete single chip microcomputer application system.

First, the composition and basic functions of the experimental board of single chip microcomputer

The experimental board of single chip microcomputer consists of 803 1, 8 155, eprom2764, max232 keyboard and display. The 8 155 chip has 256 ram units, which are connected with six 7-segment code displays and eight input keys. The serial port is connected with the max232 serial port conversion chip, and the p 1 port is reserved for the input and output of some control variables for expansion. On the experimental board, keyboard scanning program, display program, time setting and timing program, program for inputting two addend or subtractive display results from keyboard, logical operation program for bit variables, communication program between serial port and upper computer, etc. can be written. , and can also be combined with other courses for experiments. For example, in the process of electronic measurement, various frequencies can be measured through the input of 803 1 single chip microcomputer p 1, and the single chip microcomputer can detect and display them. Through the combination of several courses, the course is continuous and the enthusiasm of students is improved. Since the p 1 port is led out through the socket, other interface chips such as a/dd/a can be extended to form a new application system.

Second, the derivative function of the experimental board of single chip microcomputer

The experimental board in this MCU experimental report is the hardware circuit of a MCU application system. There are keyboard input and display output. Based on this basic circuit, various applications can be derived for different detection or control objects through p 1 port. Such as setting and displaying time, detecting and controlling temperature, etc. On this experimental board, you can write the corresponding software, otherwise, you can only simulate and debug the software on the computer and can't understand the use of various control signals in the interface of single chip microcomputer. It can also help students learn the ability to analyze and solve problems. This should be reflected in the experimental report of single chip microcomputer.

Experience of visiting the laboratory (IV) On X day, under the leadership of xx, director of the office of the board of directors of the college, the heads of finance, auditing, educational affairs and laboratories of all departments of the college went to xx Water Conservancy Vocational and Technical College to exchange advanced experience in practical teaching, laboratory construction and financial management.

The Yellow River Water Conservancy Vocational and Technical College visited and studied this time is a national model higher vocational college with distinctive school-running characteristics, applied and compound talents training, complete experimental training conditions, and closely meets the needs of industry enterprises. The Department of Mechanical and Electrical Engineering is one of the key construction departments of the college, offering six majors, including electromechanical integration technology, application and maintenance of construction machinery, mechanical design and manufacturing, automobile inspection and maintenance technology, numerical control technology, and mold design and manufacturing. 60 classes, 1944 students. Advanced teaching equipment and excellent experimental training conditions. There are nearly ten professional laboratories such as electrician, electronics, hydraulic transmission, automatic detection, automatic control, CAD/CAM, PLC, motor and drag, and there are professional training centers such as programmable control room, mold design and process programming training room, machining center and CNC machining center. Through the cooperation with (from: ACT), PE2400 PCR instrument and GENEGENIUS automatic gel imaging analysis system. Many instruments are equipped with automatic sampling devices, which can work automatically as long as the data is set on the computer, which is very convenient. The busiest place in the center is the pretreatment room. Now the development direction of instrumental analytical chemistry is pretreatment, and I have this understanding here. What impressed me here is advanced equipment, strict management and high-quality personnel.

/kloc-On October X, we visited the Pesticide Inspection and Testing Institute of Shaanxi Provincial Department of Agriculture. The work is also relatively simple, mainly to test whether pesticides are qualified or entrust to test whether pesticide residues in fruits and vegetables exceed the standard according to the standards formulated by the state. This work also requires the staff to be rigorous, realistic and responsible, and every data is related to the fundamental interests of farmers or enterprises. Under the guidance of alumni of our department, we visited the liquid chromatograph, high performance gas chromatograph, gas chromatograph-mass spectrometer and pretreatment room successively, and all the unknowns were explained in detail. Then the leaders of the unit gave us a detailed introduction to the management system of the unit in the conference hall, which gave us a certain understanding of the management mechanism of the institution. In addition, we have to accept national testing every year to determine what kinds of pesticide residues and their contents are contained in blind samples. This is a complicated job, which is beyond the ability of a newly graduated undergraduate and requires certain work experience and professional knowledge. I deeply realized my lack of knowledge and my ability to apply my professional knowledge to practice.

We visited and practiced the environmental monitoring station in October. Environmental monitoring station is a national first-class monitoring station, which is responsible for the procuratorial monitoring of air water pollution and consists of three local stations. Many staff here are alumni of West University. Accompanied by alumni and seniors, I visited several air pollution control rooms. Through the introduction of alumni, we know that the country is increasingly supporting environmental protection, and their experimental conditions have been greatly improved compared with ten years ago, and the experimental conditions and equipment are getting better and better.

On X, our last stop was Shaanxi Huashan Chemical Group Co., Ltd., which was the only enterprise for our internship. Shaanxi Huashan Chemical Industry Group Co., Ltd. is a provincial-level large-scale chemical enterprise that was restructured from the former Huashan Chemical Fertilizer General Factory in Shaanxi Province in August 1997. In the same year, controlled by the group company, Shaanxi Shaanxi Chemical Fertilizer Co., Ltd. was jointly established with 1 1 investment unit. The company covers an area of/kloc-0.70 million square meters, employs more than 3,600 people, has total assets of/kloc-0.25 billion yuan and registered capital of 4/kloc-0.00 billion yuan. The annual output is 200,000 tons of synthetic ammonia, 300,000 tons of urea, 0/50,000 tons of sulfuric acid, 0/40,000 tons of diammonium phosphate, 30,000 tons of methanol, 50,000 tons of ternary compound fertilizer and 0/00,000 square meters of woven bags. I thought there was nothing worth visiting in urea production, but I found out that I was wrong when I got to the factory. The production of urea is far from as simple as I know, not a simple equation, and the production process involves a lot of chemical knowledge. What you get on paper is so shallow that you never know what you have to do. During my short internship, I deeply felt that the superficial knowledge and practical application I learned made me feel very sad. At school, I always thought I was doing well. Once you come into contact with reality, you don't know how little you know, and you really realize the meaning of "endless learning". This is not my feeling alone. We visited the biogas workshop, synthesis workshop, control room and the laboratory in the factory in turn, and finally arrived at the urea synthesis workshop. As soon as we entered the factory, the alumni in the factory repeatedly emphasized the safety issue to us. In some conspicuous positions in the factory, there are slogans about safety in production, and check the work situation of the post. Some people are criticized by name for taking a nap or feeling depressed at their posts. Indeed, safety in production is the first priority. After entering the company, you can't be free and loose anymore.

I benefited a lot from just four days' internship. First, I deeply realize that no matter how profound the written knowledge we have learned in school and how solid the theory is, the most important thing is to link operation with production practice, which requires certain practical ability and operation ability, as well as the ability to find, analyze and solve practical problems, so as to meet the needs of production development; Secondly, I have accumulated some production experience and have a clear understanding of the employment direction and characteristics; Thirdly, through this production practice, I realize my own shortcomings and strive to improve my ability in all aspects through hard study in the future, so as to further improve myself and improve my quality; Fourthly, through this production practice, I broadened my horizons and learned a lot of knowledge outside the textbook. I hope there will be more opportunities for production practice in the future, so that we can better exercise ourselves and improve our ability in practice.

As a student, I want to study not to pass the final exam, but to acquire knowledge and work skills. In other words, studying at school is to meet the needs of society and to ensure that I can finish my future work and make contributions to society through study.

A few days of internship passed quickly, and good things were always lost. Here, I would like to thank all the leading teachers who provided help and guidance for my internship, and thank you for your concern and help for so many days. I believe this precious internship experience will always accompany me in my future work and life. A journey of a thousand miles begins with a single step. Through this internship, I will know more about the accumulation of knowledge and practice and constantly enrich myself.

Experience of visiting the laboratory (5) After eight hours of basic welding experiments around * * *, I feel that I have learned a lot. Although I studied welding as a metalworking intern in my sophomore year, I didn't know the welding principle at that time. It's very easy to do experiments after learning the basic theory of welding, because I know a lot about welding principle. I also know that welding is not only electric welding, but also gas welding and so on.

In the welding experiments around here, we generally study gas welding and electric welding. Gas welding is also divided into low carbon steel, medium carbon steel and high carbon steel. It can be clearly felt during the welding process that the difficulty of high, medium and low carbon steel is obviously different!

One course we studied was the welding of cast iron, and the fluidity of cast iron was obviously poor! Before each experience experiment, the teacher will always introduce us to the matters needing attention and experimental content in the experiment! Through the teacher's introduction and personal experience, we can say that we have a good understanding and experience of the content of each experiment.

I have a deep memory of this welding experiment, because I encountered many problems during the experiment. The teacher always gives me a detailed explanation of the reasons for these problems and how to solve them. For example, an experiment is about the butt joint of thin steel plates. I carefully put two thin steel plates on the test board and welded them together. I thought it was the simplest welding, but the result was not satisfactory. When I welded these two steel plates by flat welding, I found that the welded steel plates were seriously deformed, and the originally flat steel plates were tilted up! Moreover, due to the poor welding process, the weld seam is very uneven, and even the phenomenon of penetration has appeared in some places. I'm really ashamed of such a welding product! But the teacher explained the reasons for these problems to me in detail. For example, the steel plate is inclined because of uneven heat dissipation during welding. These phenomena can be solved by experience. The teacher held my hand and filled in the welded hole. The teacher told me that this is caused by short arc and slow welding speed! He also encouraged me not to lose heart. I am particularly touched!

I am very annoyed that I have a whole body of theoretical knowledge, but the welding effect is still so poor, so I think this experiment is necessary and helpful for those of us who have learned a lot of theoretical knowledge. Let us see our own gap and lack of experience. We need to study hard and pay more attention to practical application in the future, so that we can be comprehensive and practical applied talents!