Die on Mars - Chapter 195

c195 Day 322 (5) Advanced math questions in the air crash

Jumper?

Maidong frowned. She was not an electrical major. When talking about jumpers, the first thing she thought of was the extremely critical moment in Hollywood movies. The hero or heroine smashes open the center console of the car and pulls out two thin wires. , sizzling fire, the car engine started.

This is using the instantaneous current during short circuit to start the car engine. Is there such an easy way to start the space station computer?

“Listen to my command! Girl!”

“good.”

Tang Yue stared closely at the circuit diagram on the monitor. The schematic diagram and block diagram of the power distribution system of the core module of the United Space Station were displayed on the screens on both sides of him. The old cat even found the assembly diagram for him. The cat was sitting on his knees. On the table, his head poked out from behind the computer monitor, holding a third screen in his hand.

Tang Yue held a pen and wrote and drew quickly on the manuscript paper. The tip of the pen rubbed against the paper and made a rustling sound. Cold sweat broke out on Tang Yue’s forehead. Although this kind of analysis was his specialty, the power distribution of the space station The system was complex beyond his imagination. Tang Yue had not touched such basic operations for many years since graduating from college. Even during ground training and daily work, he did not need to dismantle the entire core cabin. .

There is no EDA software in Kunlun Station, so I can only make do with pen and paper.

“IC780…IC780…amplifier, triode? Yes, it is a triode, one, two, three, four, five and six six unit circuits, STO5347 oscillator…Is this an open drain or an open collector? I have to see if it is driven by an external circuit , has nothing to do with the inside of the IC – use low-level logic to control high-level… total frequency conversion! Frequency conversion! Frequency conversion, frequency conversion, damn frequency conversion!”

Tang Yue turned back into the student who was fretting over the test paper in the examination room overnight.

Calm down calm down calm down I’ve seen this before!

calm!

Tang Yue’s heart rate was rising crazily, and his hand holding the pen couldn’t stop shaking.

It’s like your flight is about to crash. At this time, someone throws you a very difficult high-level math problem and asks you to solve it within five minutes. If you solve it, the plane will be saved.

Beads of sweat slid down Tang Yue’s cheeks.

Maidong is still waiting for his instructions.

The old cat’s head rested on the top of the monitor, and a pair of cat eyes looked down at Tang Yue’s work.

“Pin 13 of TC88604, because it is a time-varying component.” Old Cat said coldly.

Tang Yue was stunned for a moment.

“You understand this?”

“I’m not as good as you.” Old Mao tilted his head and held up the monitor, “I know a little bit.”

“Okay!” Tang Yue pushed a pile of manuscript papers on his left, “Help me find a way to excite the voltage source USP7540! Remember not to violate Kirchhoff’s law.”

The old cat freed up a paw to pick up the manuscript paper. There were messy wirings drawn on the paper. The old cat slowly narrowed his eyes.

“Oh… did you give me the most difficult part to calculate? This is a nonlinear time-varying thing. I need to solve a long, long, long non-homogeneous linear differential equation.”

“Then please hurry up!”

“It’s been solved.” The old cat stretched his neck, picked up the pen from the table, and wrote down the answer calmly, “Here.”

“Girl!” Tang Yue threw away the pen in his hand and jumped up with the final result, “Girl! Girl, can you hear me? Girl?”

This damn half-duplex conversation system doesn’t allow both parties to talk at the same time. When one person talks, the other person can only listen.

“Girl, girl, girl, please answer the phone… answer my phone…”

After Tang Yue finished speaking, he could only wait anxiously for the other party’s response.

“Tang Yue?”

“OK! Girl, listen to me carefully, I will teach you how to restart the computer!” Tang Yue stared at the scratch paper in his hand, “Under the current conditions, it is impossible to restart the computer directly, or I haven’t found a way yet. , but we can start it indirectly… by short-circuiting the overload protector to start the computer.”

“Overload protector?” Maidong held up the flashlight, a little confused. She didn’t understand electricity.

“Yes!” Tang Yue said, “The overload protector has the authority to turn off or turn on some modules of the computer – when it detects that the current in certain characteristic circuits exceeds the threshold, in order to protect the computer from being burned by abnormal current, the protector will Close the corresponding module and perform a self-test at the same time! In the process, it will restart the system computer!”

“But how do we know that the protector is still working?” Maidong looked around, covering his mouth and nose with one hand, surrounded by darkness, “And the cabin has been completely powered off…can it still work?” ”

“The protector does not require power.”

Maidong was a little surprised, “You don’t need a power supply?”

“Yes, the overload protector is just an air switch or a fuse. It does not rely on circuit control, but relies on the physical properties of the material itself! The Hall effect plays a role in the overload protector. As long as the current flowing through it exceeds the threshold , then the protector itself will generate a sufficient potential difference.” Tang Yue explained, “This weak potential difference will trigger the underlying Reset switch in the computer – this is a simple and straightforward reaction like a knee-jerk reflex, very reliable!”

“Understood.” Maidong said.

“First step, we need to confirm that the computer itself is not disconnected from the power supply.” Tang Yue gave the order.

No matter what method they use to restart the computer, they must ensure that the computer itself has power and cannot be physically isolated from the battery – the United Space Station was hit by Orion, and the solar panels were basically destroyed, even if there are some remaining, It is definitely unusable now, but fortunately the core module itself was not damaged, which shows that the computer chassis and battery are very likely to survive.

“Maidong, is the sub-panel still there?”

Maidong turned his head and said, “It’s still there…it’s just a little shaken.”

“Okay, listen to me. The second row of switches on the sub-panel is the column marked ‘PIN-B’. There are three black switches in total. Turn them all to the 2nd position.”

Maidong followed his instructions and pushed all the switches.

“Switches marked ‘PIN-C’ in the third row are all set to 2nd position.”

Maidong pushed up the switches one by one.

“Tang Yue, the green light is on.”

“Very good, this means there is still electricity in the battery!” Tang Yue clenched his fist, “I designed four jumper methods to restart the computer. Let’s try them one by one.”

Maidong nodded. She held the flashlight in her mouth and began to clean the wires exposed after the computer main control instrument was damaged. There were two or three wires in each hole, with different colors. They were originally supposed to be connected to different switches or valves. on, but now they are all lumped together.

“Look for the white wire labeled ‘H.D.’ It should be on the far left side of the first row.”

Maidong got closer and searched carefully. These cables were only one or two millimeters thick. In the smoke-filled core cabin, it was difficult for Maidong to see the writing on them clearly.

“Is it white?” Maidong said and coughed again, “Tang…Tang Yue?”

“Yes, white.”

“I found it.” Maidong replied, “The white H.D. wire.”

“Look for the red wire marked with the letter ‘P’, it’s on the second row.”

“The red wire of the letter…the letter P…” Maidong coughed violently and almost couldn’t hold the flashlight in his hand. Tang Yue heard violent coughing and wheezing on the channel, and his heart clenched involuntarily. stand up.

“Girl? Are you okay?”

“No…it’s okay.” The girl shook her head, “I found the wire.”

“Two wires shorted together.”

Maidong tilted his head and clamped the flashlight, bit off the insulating rubber on the outer layer of the wire with his teeth, and then twisted the two wires together.

“Tang Yue…the green light on the secondary instrument is on.”

“Good job…” Tang Yue stared at the circuit diagram on the draft paper, “Good job girl, next find the red wire marked ‘H.D.’, be careful not to find the wrong one, this time it is red!”

“It was right on the edge of the white line, I saw it.”

“Now turn the switch in the center of the second row of the secondary instrument to 1, and then short-circuit the white wire marked H.D. and the red wire!” Tang Yue said that this was the most effective restart method he could come up with. Creating a short-circuit current triggers the overload protector, which activates the computer’s Reset switch.

Ophiopogon japonicus pressed the two wires together.

“How is it?” Tang Yue’s heart skipped a beat.

“Nothing happened.” Maidong turned around and looked around. The space station was still dark and there was no movement.

Tang Yue’s heart sank.

“Try again, separate the two wires, short them together again…try again.”

Maidong grabbed a wire with one hand and touched it gently. At the moment of contact, small sparks burst out from the core of the wire.

Then there was a buzzing sound in Maidong’s ears. Something was activated. The sound grew from small to loud, and soon it was heard from all directions. The girl raised her head, and the lights on the bulkhead lit up one by one. Lighted up, the undamaged displays also lit up one by one, the core cabin lit up piece by piece from beginning to end, and the crystal cabin returned to light.