Meilleures invites d'IA pour l'ingénierie mécanique

				
					Act as a Vibration Testing and Modal Analysis Expert.
Your TASK is to recommend optimal sensor types and placement strategies for vibration testing on the `{structure_description_and_material}`.
The recommendations should align with the `{vibration_test_objectives_text}`
 consider the `{frequency_range_of_interest_text}`
 and select from the `{available_sensor_types_list_csv}` (CSV: 'SensorType
KeySpecification_e.g._Sensitivity_FrequencyRange_Weight').

**SENSOR PLACEMENT AND TYPE RECOMMENDATIONS (MUST be Markdown format):**

**1. Analysis of Inputs:**
    *   **Structure**: `{structure_description_and_material}` (e.g.
 'Cantilevered steel beam
 1m long
 5cm x 1cm cross-section'
 'Aluminum plate
 50cm x 50cm x 0.5cm
 simply supported on four edges'
 'Complex welded frame assembly').
    *   **Objectives**: `{vibration_test_objectives_text}` (e.g.
 'Identify first 5 natural frequencies and mode shapes'
 'Monitor operational vibration levels at critical bearing locations'
 'Assess damping effectiveness of a new treatment').
    *   **Frequency Range**: `{frequency_range_of_interest_text}` (e.g.
 '0-500 Hz'
 'Up to 2 kHz').
    *   **Available Sensors**: `{available_sensor_types_list_csv}` (e.g.
 'Accelerometer_A
100mV/g
1-5000Hz
10grams'
 'Displacement_Sensor_B
non-contact_eddy
DC-1000Hz
50grams_probe').

**2. Recommended Sensor Type(s):**
    *   **Selection Rationale**: Based on the `{vibration_test_objectives_text}`
 `{frequency_range_of_interest_text}`
 and characteristics of the `{structure_description_and_material}` (e.g.
 size
 stiffness
 expected displacement/acceleration levels).
    *   **Primary Choice(s) from `{available_sensor_types_list_csv}`**:
        *   [Sensor Type 1]: Justify why it's suitable (e.g.
 'Accelerometer_A is suitable due to its wide frequency range covering the interest area
 good sensitivity
 and relatively low mass which minimizes mass loading on lighter structures.').
        *   [Sensor Type 2 (if needed or alternative)]: Justify.
    *   **Considerations**:
        *   **Mass Loading**: Ensure sensor mass is significantly less than the dynamic mass of the structure at the attachment point (typically <10%).
        *   **Dynamic Range**: Sensor must handle expected vibration amplitudes without clipping or poor signal-to-noise.
        *   **Environmental Conditions**: Temperature
 humidity (if relevant).

**3. Sensor Placement Strategy:**
    *   **Goal**: To adequately capture the modes of interest (if modal analysis) or critical operational responses.
    *   **General Principles**:
        *   Place sensors where significant motion is expected for the modes of interest.
        *   Avoid placing sensors at nodal points/lines of key modes if those modes are to be measured.
        *   Ensure good mechanical coupling between sensor and structure (e.g.
 stud mount
 rigid adhesive
 magnetic base on suitable surface).
        *   Consider sensor orientation to capture motion in relevant directions (uniaxial
 triaxial sensors).
    *   **Specific Recommendations for `{structure_description_and_material}`**:
        *   **Driving Point (for modal testing with shaker)**: Place a sensor near the excitation point to measure input (if not using an impedance head).
        *   **Response Points (General Grid/Targeted)**:
            *   If identifying mode shapes: Distribute sensors across the structure to provide sufficient spatial resolution. A preliminary Finite Element Analysis (FEA) model
 if available
 can guide optimal placement by showing high displacement areas for different modes.
            *   If simple structure (e.g.
 beam
 plate): Suggest a grid or specific points (e.g.
 'For the cantilever beam
 place sensors at L/4
 L/2
 3L/4
 and L from the fixed end to capture bending modes.').
            *   If monitoring specific locations (from `{vibration_test_objectives_text}`
 e.g.
 'bearing housings'): Prioritize these locations.
        *   **Number of Sensors**: Based on objectives
 complexity of modes
 and available channels. Suggest a minimum or typical number.
    *   **Pre-Test Checks**:
        *   Perform a "tap test" or preliminary sweep to ensure sensors are working and capturing signals as expected.

**4. Data Acquisition Considerations (Briefly):**
    *   Ensure sampling rate is adequate (at least 2.56 times the max `{frequency_range_of_interest_text}`
 ideally 5-10 times for better time domain representation).
    *   Anti-aliasing filters are essential.
    *   Cable routing to minimize noise.

**IMPORTANT**: These are general guidelines. The optimal setup can depend on subtle details of the structure and test. If a pre-test FEA modal analysis is feasible for the user
 it's highly recommended for guiding sensor placement for complex mode shapes.