Engineering

TECHNICAL TASK (written by six) Development of a turnkey interactive projection system with software for 6 mm Airsoft shooting (similar to the airsoft digital target system Arcada; https://youtu.be/3HwgDuesDTU?si=vZCKD4pZDXtL3kZl) An engineer or a small team with experience in DSP / DAQ / acoustics / vibration measurements / piezoelectric sensors / impact localization is needed. 1. Overall project goal A prototype of an interactive shooting game system is to be developed for use in entertainment centers. Operating principle: An interactive image or game is projected onto a physical screen by a projector. The user shoots at the screen with standard Airsoft guns using 6 mm BB plastic balls. The system must determine the coordinates of each physical hit on the screen in real-time and transmit the X/Y coordinates to the software. The software matches the physical hit point with the object currently displayed by the projector, after which the game responds accordingly to the shot. The main task of the first stage is to create a reliable technology for determining hit coordinates. 2. Size of the first prototype Working area: 1000 × 1000 mm. After successful testing, the technology should be scalable to larger screens, approximately: 2000 × 1200 mm; 2400 × 1350 mm; or other commercial formats. Therefore, the system architecture must consider further scaling. 3. Type of ammunition Main type: Airsoft BB — plastic balls of 6 mm caliber. The system must operate with standard Airsoft guns within a safe energy range for the entertainment venue. The specific allowable range of speed and energy of the BBs must be determined experimentally during development. 4. System operation principle Basic concept: Shot → BB impact on the screen → impact registration by sensors → signal processing → X/Y coordinate determination → event transmission to the game software. For example: SHOT #00125 X = 643 mm Y = 271 mm Timestamp = ... Confidence = ... The coordinates must be transmitted to the software via API, SDK, TCP/UDP, WebSocket, or another stable interface. 5. Screen design A metal impact surface is considered for the first prototype: an aluminum or polycarbonate panel approximately 1000 × 1000 × 1 mm. Thickness, alloy, and mounting design are NOT final. The engineer must experimentally determine the optimal: material; thickness; tension/fixing method; damping; frame design; sensor placement. It is important to ensure: stable propagation of mechanical/acoustic waves; sufficient durability under repeated impacts; the possibility of quick replacement of the impact panel; minimal impact of the mounting on the accuracy of coordinate determination. 6. Sensor system Approximately 4–8 or more sensors are planned for use. Possible technologies: IEPE/ICP piezoelectric accelerometers; contact acoustic sensors; piezoelectric sensors; ultrasonic methods; other technologies proposed by the engineer. The number and type of sensors should be determined not formally, but based on the best accuracy, speed, reliability, and cost of the serial system. Preference is given to ready-made professional components from existing manufacturers. There are no plans to develop proprietary electronic boards if the task can be reliably solved with ready-made serial equipment. 7. Coordinate determination An algorithm for determining the coordinates of physical hits must be developed. Possible methods: Time Difference of Arrival (TDOA); wave arrival time analysis; amplitude analysis; signal shape analysis; frequency analysis; correlation methods; calibration surface map; machine learning; combination of several methods. The engineer may propose another technology if it provides better results. 8. Accuracy The desired final accuracy of coordinate determination: approximately ±5–10 mm across the entire working surface. For the first prototype, an acceptable intermediate result may be: up to ±20 mm, if there is a clear technical path to further improve accuracy. It is necessary to measure: average error; maximum error; error near the edges; repeatability of results. 9. Speed of operation Hit determination must occur almost instantaneously. Desired latency: less than 10–20 ms from physical impact to coordinate transmission to the game, if technically possible. The system must recognize a series of rapid consecutive shots. In the future, support for multiple players and high shooting intensity is required. 10. Simultaneous and close hits The possibility of correctly processing must be investigated: rapid consecutive shots; two hits with a small time interval; potentially simultaneous shooting by two players. The algorithm must not mistakenly combine two different shots into one hit. 11. Calibration The system must have a procedure for automatic or semi-automatic calibration. For example: a grid of control coordinates is set on the screen. A series of test shots is performed at known points. The system records signals from all sensors and creates an individual calibration model for the specific screen. Calibration must compensate for: differences between panels; mounting features; wave reflections from edges; differences between sensors; temperature and mechanical changes, if they significantly affect accuracy. 12. Self-diagnosis It is desirable to provide for automatic checks of: the operability of each sensor; signal level; absence of cable break; the need for recalibration. In case of malfunction, the system should report which specific component needs checking. 13. Projector At the next stage, a projector will be connected to the system. The projector will display: moving targets; arcade games; training scenarios; scoring system; multiplayer scenarios. Hits must accurately correspond to the projection coordinates. Software calibration must be provided: physical screen coordinates ↔ projector image coordinates. 14. Game software At the first stage, it is not necessary to develop full-fledged games. A test program is needed that shows after a shot: hit point; X/Y coordinates; shot number; time; error relative to the control point; service information about sensor signals. In the future, the system should have the capability to integrate with a game engine, such as Unity or Unreal Engine. 15. Equipment Priority: use of ready-made professional serial components. It is necessary to avoid developing proprietary complex electronics if reliable ready-made solutions exist. Components from manufacturers of the level are considered: professional data acquisition systems DAQ; IEPE/ICP and other industrial sensors; ready USB/Ethernet interfaces; serial cables and connectors. No specific manufacturer is fixed. The engineer may propose optimal components. 16. Prototype budget The estimated budget for the sensor system and main equipment of the first prototype: up to 5,000 USD. PC and professional projector may be considered separately. It is important to find a balance between: accuracy + speed + reliability + possibility of serial production. 17. Commercial operation The final system is intended not for a laboratory but for daily commercial operation in an entertainment center. Therefore, the equipment must: operate many hours daily; withstand a large number of shots We can provide premises for the development and release of this project in the city of Lviv with the prospect of continuing activities as a partner

Develop a motor control system based on aCAN bus network, including: Selecting and specifying commercially available PLC hardware and related components. Developing the control software for operating the system from aPC and atablet (or adapting existing software to meet the system requirements). Preparing complete engineering and manufacturing documentation required for the production of the control system. A key requirement is that the maximum communication distance between the controller and the PC or tablet must beup to 100 meters. The main motor parameters, as well as the preferred/recommended hardware components, will be discussed and agreed upon during the project.

It is necessary to develop the design of an ergonomic chair/suspension for a worker who works standing for long periods during the repair of wooden pallets. The chair must be attached to the carriage of the ceiling rail system and move with the worker within the working area. The main goal is to partially relieve the load on the legs and back, while the worker's legs predominantly remain on the floor. Key requirements: designed for a user weighing approximately up to 100 kg with the necessary safety margin; adjustability of height and body support level; comfortable transition between standing, semi-sitting, and sitting positions; quick and safe release of the worker from the chair; ability to rotate around a vertical axis; the chair should not restrict the movement of arms and legs; the design should not interfere with a separate carriage with a winch for lifting pallets; provide an independent safety element or another solution against falling; parts must be available for manufacturing from steel, straps, and standard components. Expected results: Several options for the chair concept. Selection and refinement of the optimal option. 3D model of the design. Drawings of parts and assemblies with dimensions. Mounting scheme to the suspension system carriage. List of materials and ready-made components. Strength calculation of the main loaded elements. Files in STEP and PDF formats for further prototype manufacturing. I am looking for a specialist with experience in mechanical engineering, industrial design, ergonomics, or the development of suspension equipment. Preference will be given to a contractor who can not only create a visualization but also prepare a technically sound design for manufacturing and testing. Detailed dimensions of the rail system, photographs, and my developments will be provided to the selected contractor. The project is related to human safety, so the final design must undergo verification by an engineer and testing before use. Important condition regarding patents: There is a similar suspension system from the company Standing Ovation. Its product can only be used as an example of an already known solution, but its design, layout, and operating principle must not be copied. It is necessary to develop an independent technical solution that will have significant structural differences and will not replicate features protected by existing patents of Standing Ovation. I will provide the contractor with the found patent documents for review. During the development, it is necessary to: analyze the known product and propose another way to support the body; not copy the shape of the chair, frame, suspension, adjustment mechanism, and mounting scheme; prepare a brief description of the main technical differences; create a comparison table of the new solution with the Standing Ovation design; provide for the possibility of further patent verification and patenting of the own design. The contractor is expected to deliver a technically independent design; however, the final legal check for patent purity will be conducted by a separate patent specialist.

Need experience with SolidWorks metal doors We will discuss the terms of reference in private ................................................................

We need a design engineer or a spring design specialist with experience in calculating and developing design documentation. Required tasks: calculate spring parameters according to specified technical requirements and samples; select the optimal material according to operating conditions; determine the main geometric parameters (wire diameter, outer/inner diameter, number of turns, pitch, length, etc.) from the provided sample; perform verification calculations (stress, working stroke, resource, safety margin); prepare drawings for further production; provide a specification indicating the material and main technical characteristics. Types of springs: compression springs; extension springs; torsion springs (if needed). Requirements for the performer: experience in spring design; knowledge of standards (DIN, EN, ISO, GOST or similar); understanding of spring manufacturing technology; At the beginning of cooperation: The development of several springs is planned. If the cooperation is successful, long-term collaboration with regular orders is possible.

Develop a control program (G-code) for a CNC milling machine for cutting parts from a solid blank using the nesting method (optimal packing). Initial data: — 3D models of parts in the format you need — Material of the blank: polystyrene — Size of the machine table and blank: 1200×1200×150 mm — Machine: three-axis milling (to be discussed) — Diameter of the cutter: to be discussed — Number of axes: 3 Requirements for the result: — Optimal placement of parts with minimal material waste — Correct allowances for tool diameter (radius compensation) — Technological bridges (tabs) to hold parts during cutting — Order of passes: rough pass → finishing — Post-processor for the specified machine controller — G-code file + screenshot of the trajectory simulation Experience that is mandatory: — Work in a CAM system (Fusion 360 CAM / Mastercam / SolidCAM / ArtCAM or similar) — Experience in nesting parts — Understanding of cutting modes and feeds for specific materials In your response, please specify: — The CAM system you are working in — Machine controllers for which you have written post-processors — An example of a completed similar work

We are looking for a physicist engineer or a design engineer with experience in developing induction chargers, Qi/Qi2, and working in KiCad. We already have: a ready-made wireless charging board for two devices; two coils for charging a phone and headphones; the case design and 3D models. What needs to be done Add a third charging channel for Apple Watch. Select and calculate the coil, electronic components, and connection scheme. Resolve the issue of correct Apple handshake and compatibility with Qi/Qi2. Check if the system can stably charge three devices simultaneously. Calculate the required power of the power supply, heating, and main electrical parameters. Consider the shielding of the coils, as the charger is installed inside a wooden case. Prepare or refine the schematic and PCB in KiCad. Provide recommendations on design, safety, and further certification of the device. We are considering two work formats: full development and preparation of files; engineering consultation with calculations and recommendations that our specialist can implement. Please, when responding, write: whether you have experience with wireless chargers Qi/Qi2; whether you have worked with Apple Watch or MFi components; whether you can perform calculations for coils, power, heating, and shielding; attach examples of similar projects.

Good evening! It is necessary to assemble a lamp using electronic components that are sold in the USA, specifically on specialized sites. If you can design the casing where these components will be inserted - great, if not, that’s fine too. The components need to be selected so that minimal effort is required for connection. Two options are needed: Option 1: A bedside lamp that can be charged via USB-C in 2-3 hours and the charge lasts for at least 100 hours of operation + battery discharge indicator + touch activation. Option 2: The same but with added Wi-Fi and connection to smart home systems like Google/Amazon Alexa and others + the ability to charge via wireless charging, so include wireless charging. Work stages: 1. Provide a list of components and connection instructions to assemble without designing the casing. 2. We assemble the model and check that it works. 3. We close the project.

Planning options for a shower module for military use based on 20 and 40-foot shipping containers. Various combinations are available. This is an AI-generated photo; it needs to be adjusted and smart dimensions for walls, partitions, and overall sizes applied for further manufacturing.

Assembly Principle: Completely weld-free, exclusively using bolted connections (“NO-WELD BOLTED CONSTRUCTION”). The structure is modular (Flat-Pack) to minimize logistics costs and facilitate self-assembly by the customer. 1. TECHNICAL REQUIREMENTS AND AESTHETICS • Requirement for the developer: The product must be designed to have a flawless, presentable commercial appearance for export to the EU market. • Intuitive assembly: The design should allow for the simplest assembly possible, enabling the customer to assemble the box independently without special tools. • Frame material: Stainless steel AISI 304 (matte), sheet thickness — 1 mm. • Construction: Corner system with flanging for rigidity and safety. Stacking (nesting) during transportation. • Wall filling (sandwich): PIR board (30 mm) with a tolerance of ±4 mm. The groove design should compensate for this tolerance, eliminating gaps. • Wall cladding: PIR board is covered on both sides with smooth stainless steel sheets of 0.5–0.6 mm. • Assembly: Strictly with bolts (stainless steel A2/A4). Minimum number of bolted connections inside the working area for ease of cleaning and disinfection. • Feet: Height 30 mm, integrated into the lower binding contour. 2. DOOR CONSTRUCTION AND LOCKING • Sealing: Rubber seal around the entire perimeter of the reveal and a stop (false bar) for 100% elimination of gaps. • Hinges: Seat design that eliminates play (bolts serve only the function of clamping). • Locking: Mechanical latch lock “finger in hole”. • Door configuration: Doors spanning the full width and height of the facade, divided horizontally into two independent sections: upper and lower. ◦ Lower section: blind. ◦ Upper section: has a viewing window. ◦ Operating principle: The lower section opens first and, when closing, tightly presses against the upper section. • Viewing window (Product No. 1): Located in the upper section. Double-sided, with an air layer. Clamping strips for securing any transparent material (glass, plastic, or film) with a thickness of from 2 to 5 mm. 3. VENTILATION SYSTEMS (Identical for both products) • Protection: Mesh (stainless steel, wire 0.5 mm, cell 0.8 mm). Installation — through clamping frames with bolts (without drilling the mesh). • Upper exhaust (120 cooler): Cutout 200x200 mm in the roof, cooler installation through a flange with M4 thread. Under the cooler (above the mesh) — adjustable damper (shutter). • Lower intake: Two openings (left and right), raised 100 mm from the floor. Area of each — 300 cm². Both intakes have adjustable dampers (shutters). 4. PRODUCT SPECIFICATION • PRODUCT No. 1 (Vertical 600x600x1200 mm): Two-section doors (lower blind, upper with window). Equipment: lamp mounts, cable pass-throughs, mounts for IR film (on the wall), curtains for mesh suspension, strip for the shield from the end. • PRODUCT No. 2 (Horizontal cabinet 600x600x600 mm): Single-section doors without glazing. Equipment: lamp mounts, cable pass-throughs, mounts for IR film (on the wall), stainless steel guides for shelves, strip for the shield from the end. 5. WHAT IS REQUIRED TO BE DELIVERED: 1. 3D assembly: STEP / SolidWorks formats, with the ability to freely disassemble the model. 2. Drawings: Detailed drawings of assembly nodes. 3. Unfoldings: DXF format (considering the K-factor of bending). 4. Specification table (BOM): All stainless steel fasteners.

Quantity Surveyor needed for detailed analysis of a construction project We are looking for a specialist to thoroughly analyze the project documentation of a construction site and prepare a detailed list of all materials, volumes, and types of work.Main Task Based on the project documentation, a complete quantity take-off of the project must be performed, and a transparent table of all construction materials and volumes must be prepared. The initial data may include: architectural drawings — AR; structural drawings — KJ / KM; specifications; PDF; DWG; Excel files; if available — BIM/Revit model. We need not just a general construction estimate, but a maximum detailed Quantity Take-Off and Material Breakdown.What needs to be done 1. Complete Quantity Take-Off Calculate the actual volumes according to the project: concrete by grades and structural elements; reinforcement broken down by diameters; metal structures; formwork; blocks and bricks; cement; sand; gravel; plaster; floor screed; waterproofing; roofing materials; facade materials; tiles and stone; ceiling materials; door and window structures; glass; wood; paint; fasteners; consumables; other materials present in the project. The list should be formed as detailed as possible, without combining different materials into general positions. For example: Reinforcement Ø8 — kg Reinforcement Ø10 — kg Reinforcement Ø12 — kg Reinforcement Ø16 — kg Concrete B25 — m³ Concrete B30 — m³ AAC Block 100 mm — m² / pcs. AAC Block 150 mm — m² / pcs. 2. Breakdown by project sections All volumes must be structured at least by the following categories: Foundation; Structural Frame; Slabs; Walls; Roofing; Facade; Flooring; Ceilings; Doors & Windows; Waterproofing; Finishing Works; External Works; other project sections. It is also desirable to separate materials by floors, buildings, villas, blocks, or zones of the site, if the project structure allows. 3. Material Breakdown A separate table of all materials needs to be prepared in the format:SectionMaterialSpecificationUnitQuantity The goal is to obtain a complete list of materials required for the construction of the site, with actual quantities. 4. BOQ — Bill of Quantities A structured BOQ needs to be prepared separately:SectionWork ItemMaterialUnitQuantity If possible, also separate: Materials; Labor; Machinery / Equipment; Transport; Waste Allowance. The main task is to ensure the ability to see the net cost of materials separately from the contractor's work cost. 5. Excel model The final work must be provided in Excel. Desired format:CodeBuildingFloorSectionMaterialSpecificationUnitDesign QuantityWaste %Purchase QuantityUnit PriceTotal Cost Additional Task It would be an advantage if the specialist can create a template system for future projects. Our goal is to use a unified structure Cost Database for analyzing different construction sites in the future. We want to be able to compare: concrete, kg of reinforcement, and materials per 1 m² of construction; cost of structures per 1 m²; materials for one room; materials for one villa; cost of individual construction elements; planned volumes against actual purchases; potential material overruns. Requirements for the Specialist We are looking for a person with practical experience: reading architectural and structural drawings; working with AR, KJ, and KM; Quantity Take-Off; BOQ; construction estimates; analysis of construction volumes; Excel. Important We do not need just a rough estimate of the total project cost. We need a specialist who can break down the project to the level of individual physical materials and quantities. The main result of the work: A complete and verifiable list of all construction materials and volumes of the site that can be used for procurement, tenders, cost control, and checking for overruns. When responding, please indicate: Your experience working with AR, KJ, and KM. Examples of completed BOQs or Quantity Take-Offs. Which programs you work with. Can you work with PDF, DWG, and Revit. How you verify the accuracy of calculations. What format of source files you need. Your cost for the project or cost per m². (Project 1000m²)