Is there any way to keep the space vehicle weightless

In fact, there is only one way to solve this problem, which is to replace gravity with other forces. Cutting off gravity or anything is impractical and unworkable.

In fact, gravity will still be affected in the sky, the effective gravitational field of the earth is very far away, the moon is still subject to the earth's gravity at 380,000 kilometers, and the spacecraft is just "weightless", and the gravitational force is just offset by the centrifugal force of the spacecraft revolving around the earth.

The method you propose, which is currently the only and most feasible method, is to replace gravity with centrifugal force.

But I have to say that your solution is not suitable for the right object, and the "high-speed rotation" itself will also bring new problems, that is, non-uniform linear motion will bring discomfort to people. The greater the angular velocity, the more obvious the discomfort.

Therefore, if you build a space city with a diameter of 40 km, you can replace gravity by rotating. However, it is impossible for the "aircraft" to be that large, so the diameter of the aircraft is generally about 4 m when rotating at high speed.

We might as well simply calculate, mg=mv*v r, about m, substitute g = 10, r = 2, we can get v = 20, about equal to every second, two and a half seconds to make a turn, the space is narrow, people are easy to feel uncomfortable.

And the spaceship is too small, the closer the person is to the center, the slower the rotation, and the different centrifugal forces of various parts of the body will also cause new problems, such as blood circulation problems and so on.

Overall, your approach works, but it still needs to be improved before it can be implemented.

OK. Due to the adverse health effects of long-term weightlessness on the human body, scientists have envisioned the future spacecraft in the shape of wheels, with energy equipment, fuel, storage and service units placed in the middle, and astronauts' working and living areas in the outer wheels. According to calculations, it only takes a few minutes for the wheel to rotate once (depending on the size of the wheel), and the centrifugal force generated can form an environment that simulates the earth's gravity, so that astronauts can basically maintain similar work and living habits as on the earth.

It's just that due to the cost problem, it can't be implemented at present. But it is still possible in the future.

The laws of physics cannot be changed.

Completely weightless in space is due to the fact that when the spacecraft orbits the earth in a circular motion, the centrifugal force of the spacecraft is equal to the gravitational force of the earth on the spacecraft, and because these two forces are in opposite directions, the people and objects in the spacecraft are in a state of weightlessness.

Astronauts fly in space, ranging from a few days to a few months, to a hailstorm or even a few years. Long-term weightlessness has many adverse effects on the human body. Human beings live under long-term stable gravitational conditions, and gravity has different effects on various parts of the human body, thus forming a certain proportion, the solidity of the bone structure and its function, the characteristics of muscle activity and body fluid distribution, which ensure that the human body is opposed to gravity and enables people to survive and develop.