The research team of Tsinghua University proposes “suspended” energy collection and burden backpack
Recently, the Department of Machinery Engineering, the Department of Mechanical Engineering of Tsinghua University, cooperated with the Beijing Academy of Sciences Beijing Nano Energy and System Research Institute team to develop a new “suspended” energy collection and burden backpack. The decoupling of backpack heavy objects and human body synergy movement, the output is continuously electrical, power the portable low -power electronic component.
As a portable storage device, the backpack is very suitable for daily activities or travel. Because of its significant liberation of the freedom of the person’s hand and enhancing the capacity of the human body, it is widely used in daily production and life. However, there is a general problem in the use of traditional normal backpacks during use, that is, the heavy objects in the backpack will float up and down with the ups and downs of the human body or running up and down. , Consume human energy, produce cumulative fatigue, and even seriously affect the movement of the human body when the heavy object reaches a certain weight. When engaged in exploration, scientific research, training and rescue in wild or remote areas, the energy source of portable electronic devices on the body is generally energy storage batteries, but its limited electrical energy and life span are the main factor that restricts its use.
Slimped teng model adopted by backpack power generation
Analysis of the above problems, the research team found that if the elastic shock absorption device is installed between the backpack and the heavy object, the relative movement between the heavy objects and the backpack of the backpack walking can be reduced, so that the heavy objects are relative to The position of the ground is stable, and the “suspended” stops in the air. Not only can we reduce the discomfort of load, at the same time, the relative movement generated between heavy objects and backpacks can directly drive the electrical energy generated unit based on the TriboElectric Nanogenerator (Teng). Electronic component power supply.
The Tsinghua Machinery Department Intelligence and Biomedical Team proposed the “suspended” energy collection and burden reduction backpack. The chloride (PVC) film slides on the nylon film. Due to the different friction and electrical negatives of the two materials, the PVC film will be negatively charged, and the nylon film will be equipped with positive charge. Therefore Field; under the action of electrostatic induction, the two sets of metal electrode surface charges that are attached to the Nylon film will be distributed again, forming a difference between the two sets of electrodes; when the external access load (such as an electric light), the electron will be in the electrons, the electrons will be in the electrons in it Under the influence of the electrostatic influence, it shines through the electric light, that is, the current through the external load circuit to generate electricity. The PVC film on the Nylon film back and forth will constantly change the electrostatic field, and the potential difference between the two ends of the metal electrode is also constantly changing, and the AC electricity is generated in the circuit with external loads. The motivation for providing PVC film movement is the relative movement of backpacks and the human body.
In addition, due to the differences in the weight and walking speed of the backpack, the research team also explores the weight loss and shock absorption effect under the conditions of different steps and heavy objects. The smaller the shock of the load, the better the weight loss effect.
Energy backpack prototype prototype
Through a series of experiments of the backpack prototype prototype, the research team proves that it can implement the preset function, that is, the wearer can reduce the back of the back, reduce the vibration during walking or running. For electrical energy, it can supply power for low -power electronic components, such as driving 210 or more commercial LED lights, low -power electronic meters and fluorescent lamp tube.
According to estimates, this new backpack can not only reduce the burden of about 20%and reduce the vibration of about 28%, but also provide the energy conversion rate of electrical energy output with an instantaneous power density of about 58W/m2 and about 14%of the mechanical energy transformation of about 14%. Related research papers are published online on February 3, 2021 on the international journal ACS NANO on February 3, 2021.
Backpack system schematic diagram
The working mode of the backpack system is two states of locking and non -locking. According to the schematic diagram of the backpack system, in the locking state, the backpack is the same as the traditional backpack. The backpack is not relative to the human body. In the non -locking state, the backpack is symmetrically distributed on both sides of the backpack. Under the joint action of the pulley set and the straight -line sliding rail, relative motion relative to the human body is generated, and then the relative motion -driven electric energy generates unit Teng AC. powered by.
The current research results only verify the feasibility of this technology, and still face many problems and challenges such as lightweight, power generation efficiency, and power management. However, the research team believes that with the further deepening of the research, this backpack will have a wider range of prospects. For children who go to school, backpackers who travel hiking, firefighters, wild foreign research staff, and rescue staff in remote areas will all will all will all will all will all will Bring a different carrying experience and continuous source of electricity.
Tsinghua University is the first unit of thesis, and the first author is Yang Ze (joint training) of Dr. China University of Geosciences (Beijing). On the day of publishing the paper, it was recommended by the ACS NANO journal website. He was selected into its Embargo Program project, and was EUREKALERT (AAAS), ScienceDaily, Scienmag, NewsCientist, New ATLAS and other 12 international technology news websites and Twitter, Facebook, When social media publicized the report as soon as possible, it was also reported by the NewScientist technology sector in headline news. Altmetricattention Score’s current attention is 133.