How to calculate bending moment with concentrated force

1. Qi and blood = constitution ×
growth rate × 2 + physical qualification × Grade ÷ The accuracy was 100%
attack = [(level - 1) × 1.5 + power] × growth rate ÷ 3 + (attack qualification) × three point seven five ÷ 1000-2.15) × Level
this formula is not very accurate, the calculated attack is slightly higher than the actual value, generally no more than 15 points
defense = enrance ×( growth rate × 725-0.8) + defense qualification × Grade ÷ 500
this accuracy is the smallest, and sometimes the calculated result may differ from the actual value by more than 15 points
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Magic = Mana × Growth rate + mana qualification × Grade ÷ The accuracy rate is more than 99.5%
speed = speed × agile ÷ The accuracy is 100%
psychic power = (mana qualification) ÷ 1000 + growth rate) × Grade ÷ 5 + Mana × 0.7 + strength × 4 + constitution × 0.3 + enrance × 2
the accuracy was 95%.

2. Analysis of an explosion accident of hydrogen proction equipment caused by an analyzer. The equipment was put into operation in August 1995. Each hydrogen proction equipment is equipped with dyz0 / 11 type oxygen in hydrogen and dqf0 / 2 type oxygen in hydrogen on-line analyzer of Handan 718 Research Institute. On September 14, 2000, an explosion accident of hydrogen proction equipment caused by an analyzer occurred< At 8:00 on September 14, 2000, the hydrogen generator of No.2 unit was started and the pressure was increased at 10:00. The purity of oxygen and hydrogen is 90% and 95% respectively by manual sampling and testing. At this time, the operator turns on the online analyzer and turns off the power switch when the analysis value exceeds the measurement range. Only a "bell" sound was heard in the analysis box, and there was a burning smell. Then there was a loud explosion at the site of hydrogen proction equipment. In the morning of the same day, the 2 × dqf0 / 22 analyzer was turned on, and it was found that a small hole was burned out at the connection of the intake pipe. The rotameter of the flow controller on site was blown up. As there was no one at the scene at that time, there was no injury accident

2. Cause and analysis of the accident

1) 2. There are problems in the equipment of the hydrogen generator. 2. The hydrogen generator has not been overhauled since it was put into operation in 1995. Before the accident, the oxygen purity decreased and the electrolyzer was stopped to clean. Since the start-up, the purity of oxygen and hydrogen has been poor. The main reason for this phenomenon is that the diaphragm effect of electrolyzer of hydrogen generator is not good, and the two gases of hydrogen chamber and oxygen chamber infiltrate each other, forming the mixed explosive gas of hydrogen and oxygen

2) there is air leakage in the connecting pipe of the analyzer. When the analyzer is disassembled, a small hole is found in the PVC hose connecting the air inlet pipe and the sensor, and the connecting pipe has been deformed. From the analysis of the phenomenon, the gas leakage occurred at the inlet connection of the sensor, and the hydrogen and oxygen mixture was formed locally in the analysis box. When there was an external open fire, it exploded immediately< The power supply of dqf0 / 2 analyzer is 220 V AC and the control switch is button switch. As we all know, the button switch is a contact type, when the switch frequently, quickly and repeatedly action may proce sparks. The electrical appliances and instruments used in hydrogen proction equipment shall be explosion-proof equipment to prevent sparks and accidents

3. Lessons from the accident and prevention

the accident was not big, but it was very serious in terms of the nature of hydrogen explosion. We should pay more attention to the safe operation of hydrogen proction equipment and learn from this accident

1) the gas transmission connecting pipe of hydrogen proction equipment has good sealing performance. Air tightness inspection shall be carried out for the gas source pipeline of the valve and instrument after maintenance, especially for the hydrogen pipeline, so as to prevent the hydrogen from leaking out and forming the mixture of local explosion

2) electrical appliances and instruments connected with hydrogen and oxygen sources should be equipped with explosion-proof equipment or explosion-proof facilities to eliminate all possible fire sources

3) in the start-up stage, it is necessary to sample and analyze manually, and then put the instruments with gas samples into operation after the procts are qualified

4) electrical switches should not be operated too frequently to prevent sparks

5) the change of oxygen purity of hydrogen generator matched with argon proction equipment is worthy of attention. In the process of hydrogen proction, the molecule of hydrogen is small. Once there is a problem in the diaphragm, the hydrogen molecule first permeates into the oxygen chamber, resulting in the decrease of oxygen purity

6) hydrogen proction equipment is very dangerous. If the purity of oxygen and hydrogen is not good for a long time, it must be stopped for maintenance. We can't drive by force because of economic benefit, in case of tragedy.

3.

It can be divided into three categories: major equipment accidents, ordinary equipment accidents and minor accidents

specific content:

1. Major equipment accident

serious equipment damage, multi system enterprises affecting 25% of daily output or repair cost of more than 4000 yuan; The single system enterprise affects 50% of the daily output or the repair cost is more than 4000 yuan; Although the above conditions have not been met, it is bad in nature and has great influence. It can also be considered as a major accident after the discussion of the unit and the consent of the leaders

2. Common equipment accident

equipment parts are damaged, which affects the proction rection of a kind of finished proct or semi-finished proct; Multi system enterprises account for 5% of the daily output or the repair cost is more than 800 yuan; Single system enterprises account for 10% of the daily output or the repair cost is more than 800 yuan

3. Minor accidents with less loss than ordinary equipment accidents are minor accidents. The amount of accident loss is the sum of repair cost, proction rection cost and loss cost of finished and semi-finished procts. Among them: repair costs include: labor costs, material costs, spare parts costs and various surcharges. The cost of proction rection is the amount of proction rection multiplied by the annual planned unit profit of the factory. After the equipment is repaired, the part of reced proction e to reced capacity may not be counted

< H2 > extended data:

prevention of equipment accidents:

1. Purchase qualified equipment

2. Do a good job in equipment installation, commissioning and acceptance

3. Provide excellent environment for equipment operation

4. Provide quality assurance for equipment operation

5

The equipment should be repaired regularly

7. Do a good job in the daily maintenance of the equipment

8. Do a good job in the search and inspection of equipment operation

Learn from the accident and avoid the recurrence of similar accidents

10. Do a good job in equipment renovation

4. Equipment accident refers to the behavior or event that the equipment (including all kinds of proction equipment, pipelines, workshops, buildings, structures, instruments, telecommunications, power, transportation and other equipment or facilities) of instrial enterprises stop proction or rece efficiency e to abnormal damage, and the direct economic loss exceeds the specified limit. The purpose of strengthening the management of equipment accidents is to take timely and effective measures to prevent the expansion and recurrence of equipment accidents. And draw lessons from the accident, to prevent the recurrence of the accident, to eliminate the accident, to ensure safety in proction< < br > classification of equipment accidents: < br > for example, the air compressor crankshaft with sand holes, under the action of long-term alternating cyclic load, proces cracks, leading to crankshaft fracture, and causes damage to cylinder block, piston and other parts at the same time, which belongs to equipment accidents. If the operator fails to open the outlet valve of the air compressor when starting the air compressor in violation of the operation regulations, resulting in equipment overpressure, causing equipment damage or explosion, it also belongs to equipment accident< According to the relevant regulations, equipment accidents can be divided into three categories: < br > 1. Major equipment accidents < br > equipment damage is serious, multi system enterprises affect 25% of daily output or repair cost is more than 4000 yuan; The single system enterprise affects 50% of the daily output or the repair cost is more than 4000 yuan; Although the above conditions have not been met, it is bad in nature and has great influence. It can also be considered as a major accident after the discussion of the unit and the consent of the leaders< Br > 2. Common equipment accident < br > equipment parts are damaged, which affects the proction rection of a kind of finished proct or semi-finished proct; Multi system enterprises account for 5% of the daily output or the repair cost is more than 800 yuan; Single system enterprises account for 10% of the daily output or the repair cost is more than 800 yuan< Br > 3. Minor accidents < br > are all minor accidents when the loss is less than that of ordinary equipment accidents. The amount of accident loss is the sum of repair cost, proction rection cost and loss cost of finished and semi-finished procts. Among them: < br > 1) repair costs include: labor costs, material costs, spare parts costs and various surcharges< Br > 2) the cost of proction rection is calculated by multiplying the quantity of proction rection by the annual planned unit profit of the factory. After the equipment is repaired, the part of reced proction e to reced capacity may not be counted< Br > 3) the loss cost of finished or semi-finished procts is calculated by multiplying the quantity of finished or semi-finished procts lost by the annual planned unit cost of the factory.

5. Bending moment formula:
m = FL / 2
(bending moment, f / L arm moment)
generally speaking, the positive and negative of bending moment are different in different disciplines. If the positive and negative of bending moment is specified, the bending moment can be calculated algebraically
in the calculation of column bending moment, the judgment method of "upper left and lower right are positive, lower left and upper right are negative" is applied. If the moment of the external force on the left side of the section to the section centroid turns clockwise, or the moment of the external force on the right side of the section to the section centroid turns counterclockwise, the positive bending moment will be proced, so the positive sign is taken; On the contrary, it is negative, that is to say, the bending moment is positive [2]
for a beam (horizontal member) in civil engineering structure, when the lower side of the member section is in tension, the bending moment of this section is called positive bending moment; When the upper side of a member section is in tension, the bending moment of this section is called negative bending moment< The bending moment direction given by PKPM:
force direction (for Foundation): the axial force n is positive (↓)
the bending moment M is positive in clockwise direction (↓)
the shear force V is positive clockwise (→).

6. There will definitely be. Even accidents have something to do with it. There must be some omissions

7. Mark, wait. Pass the picture down

8. It's not good to say that the situation is unclear. From a legal point of view, the key depends on whether it violates the provisions of the criminal law, and the specific situation can be analyzed.

9. If there is a major potential safety hazard in the equipment before the accident, and it is expected that the accident will happen sooner or later, it will not cause enough attention, and eventually lead to the accident, which is an unsafe behavior of human beings

10. Unknown_Error